Journal articles: 'Absorption and adsorption'

1

Chindikia, Ilmy, Budhi Oktavia, Ananda Putra, and Edi Nasra. "Optimasi Adsorpsi Ion Fe3+ Menggunakan Adsorben Silika Gel Sulfonat." Periodic 13, no. 1 (April 1, 2024): 67. http://dx.doi.org/10.24036/periodic.v13i1.124483.

Full text

Abstract:

Adsorption is a process of absorption of adsorbate or substances absorbed by the surface of the adsorbent or absorbent substance which aims to reduce the Fe3+ cation in a solution. Research has been carried out on the adsorption of Fe3+ cations using silica sulfonate adsorbents by varying the pH and contact time to obtain optimum conditions during adsorptions. The adsorption process of Fe3+ cations used a sulfonate modified silica gel adsorbent has been carried out by varying the pH, namely 2; 3; 4; 5; 6; 7 and the maximum pH has been fixed at pH 6 with an abdorption capacity of 2,32732 mg/g with an absorpyion percentage of 78.79 %, contact time variations of 15; 30; 45; 60; 75 minutes have been obtained for optimum contact time at 45 minutes with an absorption capacity of 2,225756 mg/g and absorption percent of 77,33 %

APA, Harvard, Vancouver, ISO, and other styles

2

Grzebielec, Andrzej, and Artur Rusowicz. "Analysis of the use of adsorption processes in trigeneration systems." Archives of Thermodynamics 34, no. 4 (December 1, 2013): 35–49. http://dx.doi.org/10.2478/aoter-2013-0028.

Full text

Abstract:

Abstract The trigeneration systems for production of cold use sorption refrigeration machines: absorption and adsorption types. Absorption systems are characterized namely by better cooling coefficient of performance, while the adsorptive systems are characterized by the ability to operate at lower temperatures. The driving heat source temperature can be as low as 60-70 °C. Such temperature of the driving heat source allows to use them in district heating systems. The article focuses on the presentation of the research results on the adsorption devices designed to work in trigeneration systems.

APA, Harvard, Vancouver, ISO, and other styles

3

Kern, Raymond. "Adsorption, absorption, versus crystal growth." Crystal Research and Technology 48, no. 10 (August 13, 2013): 727–82. http://dx.doi.org/10.1002/crat.201200704.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Tvardovskii, A. V. "A common approach to adsorption and absorption: Polymolecular adsorption." Bulletin of the Russian Academy of Sciences Division of Chemical Science 41, no. 4 (April 1992): 603–7. http://dx.doi.org/10.1007/bf01150877.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Tai, Shuyun, Ying Li, Ling Yang, Yue Zhao, Sufei Wang, Jianxin Xia, and Hua Li. "Magnetic-Transition-Metal Oxides Modified Pollen-Derived Porous Carbon for Enhanced Absorption Performance." International Journal of Environmental Research and Public Health 19, no. 24 (December 13, 2022): 16740. http://dx.doi.org/10.3390/ijerph192416740.

Full text

Abstract:

In our work, the transition-metal-oxide precursor (TMO@BC, M = Fe, Co, Ni) has been loaded on the pollen carbon by the hydrothermal method and annealed at different temperatures to generate a composite material of metal oxide and pollen carbon in this study, which can effectively prevent agglomeration caused by a small size and magnetism. The XRD patterns of the samples showed that the as-synthesized metal oxides were γ-Fe2O3, CoO, and NiO. In the 20 mg/L methyl orange adsorption experiment, the adsorption amount of CoO@C at 500 ℃ reached 19.32 mg/g and the removal rate was 96.61%. Therefore, CoO@C was selected for the adsorption correlation-model-fitting analysis, which was in line with the secondary reaction. The pseudo-second-order kinetic model (R2: 0.9683–0.9964), the intraparticle diffusion model, and the Freundlich adsorption isotherm model indicated that the adsorption process was the result of both physical and chemical adsorptions, and the judgment was based on the electrostatic action. The adsorption and removal efficiency of ciprofloxacin (CIP) by changing the pH of the reaction was about 80%, so the electrostatic attraction worked, but not the main factor. Recovered by an external magnetic field, the three-time recycling efficiency was still maintained at more than 80%. This novel biomass-derived magnetic porous carbon material embedded with transition-metal-oxide nanoparticles is highly promising for many applications, especially in the field of environmental remediation.

APA, Harvard, Vancouver, ISO, and other styles

6

Li, Qiang, Sheng Han, Da Ke Hao, Jia Jia Wang, Yan Luo, Yan Hong Qu, Dong Xue Song, and Xue Ying Hu. "Research on the Cr (VI) Absorption by Activated Sludge." Applied Mechanics and Materials 229-231 (November 2012): 138–41. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.138.

Full text

Abstract:

The adsorption performance of Cr (VI) on activated sludge and the effect of adsorption time, pH, temperature on the adsorption and desorption were studied. The initial pH is important for biosorption, and the optimum effect on Cr (VI) biosorption is acquired within initial pH of 0.5-1.0. Activated sludge has high efficiency of treating low concentration Cr (VI) wastewater. The removal rate of Cr (VI) could reach 99% when the total concentrations of Cr (VI) were 10 mg/L. The results of static test showed that the adsorption equilibrium was reached within 60 min. The biosorption process was fitted into Langmuir and Freundlich isotherm adsorption equations. It is presumed that the progress of biosorption was reversible adsorption and irreversible adsorption simultaneously, however the reversible adsorption was more important in the biosorption and the adsorption belongs to physics adsorption.

APA, Harvard, Vancouver, ISO, and other styles

7

Nadeak, Nadia Agnes Cantika, Moondra Zubir, Rini Selly, Hafni Indriati Nasution, Jasmidi Jasmidi, Siti Rahmah, and Putri Faradilla. "Adsorption Properties of Fe (II) from Activated Carbon Composite of Empty Palm Oil Bunches with Metal Organic Frameworks Cu-TAC." Indonesian Journal of Chemical Science and Technology (IJCST) 6, no. 2 (July 31, 2023): 192. http://dx.doi.org/10.24114/ijcst.v6i2.49379.

Full text

Abstract:

This study aims to determine the adsorption capacity, study the kinetics and adsorption equilibrium of activated carbon/AC and composite carbon/AC-Cu(TAC) in the adsorption process of Fe metal. Oil palm empty fruit bunches (EFB) were used as activated carbon and modified with MOFs Cu(TAC) composite. The concentration of Fe(II) ions adsorbed during the adsorption process was analyzed using AAS. The variations used to determine the optimum conditions for absorption of Fe(II) ions are the mass variation of the adsorbent, the variation of the adsorbate concentration and the contact time between the adsorbent and the adsorbate. Through variations in concentration, the adsorption isotherm characteristics were determined and through variations in contact time, the adsorption kinetics model was determined. The results of AC characterization showed a sharp absorption in the presence of OH, CH and CO groups which indicated the presence of cellulose. AC is amorphous and AC-Cu(TAC) is crystalline and the pore size is mesoporous. The optimum condition for AC is the mass variation of 1 g with an absorption capacity of 0.1816 mg/g, a variation of the concentration of 60 ppm with an absorption capacity of 3.49 mg/g and a contact time of 75 minutes with an absorption capacity of 3.82 mg/g. The optimum condition for ACCu(TAC) was the mass variation of 1 g with an absorption capacity of 0.7275 mg/g, a variation of the concentration of 180 ppm with an absorption capacity of 10.52 mg/g and a contact time of 15 minutes with an absorption capacity of 10.85 mg/g. AC-Cu(TAC) has a better adsorption ability in adsorbing Fe(II) ions. For AC and AC-Cu(TAC) the suitable adsorption isotherm is Freundlich isotherm and the suitable adsorption kinetics model is pseudo second order

APA, Harvard, Vancouver, ISO, and other styles

8

Zhou, Tao, Jian Ping Ai, Wei Xiu Liao, Li Hong Cheng, Yue Zhang, Rui Jiang, Zhi Qin Chen, and Wen Kui Li. "Zn-Cr Layered Double Hydroxides Composites for Methyl Orange (MO) Absorption." Solid State Phenomena 281 (August 2018): 836–41. http://dx.doi.org/10.4028/www.scientific.net/ssp.281.836.

Full text

Abstract:

In this study, The Zn-Cr nanocomposite was synthesized using the hydrothermal method show good adsorption property. The as-prepared LDHs absorbent were characterized by Powder X-ray Diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier Transform Infrared (FT-IR), BET surface area, and simultaneously UV-visible spectrophotometer. The nanocomposites of Zn-Cr layered double hydroxides, the strong adsorptive adsorbents for anions. Zn-Cr LDHs with various Zn/Cr molar ratios for 2, 3, 4. The nanocomposites quickly adsorbed the anionic dyes such as methyl orange (MO) without the light illumination. The effects of Zn/Cr molar ratio on the adsorption performance of Zn-Cr LDHs were investigated.

APA, Harvard, Vancouver, ISO, and other styles

9

Du, Yuan Yuan, Hai Hong Fang, and Peng Wu Zheng. "Porous Sepiolite/Starch Composites：Preparation, Structure and Absorption Properties." Advanced Materials Research 634-638 (January 2013): 1937–42. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.1937.

Full text

Abstract:

The porous nanocomposites consisting of starch and sepiolite were prepared by a solvent exchange technique, i.e. replacing ice crystals in frozen sepiolite/starch gel with ethanol. The influence of sepiolite contents on pore size, apparent density, moisture adsorption, oil adsorption capacity and dye adsorption of porous sepiolite/starch composites (SPPSs) was investigated. The addition of sepiolite reduced pore size, apparent density and moisture adsorption of SPPSs. The oil adsorption and the methylene blue adsorption of SPPSs could respectively reach 10.1 g/g and 2.07 mg g-1 at the maximal, while those of PS were only 5.83 g/g and 1.55 mg g-1.

APA, Harvard, Vancouver, ISO, and other styles

10

Kusano, Shogo, Daiju Matsumura, Kenji Ishii, Hirohisa Tanaka, and Jun’ichiro Mizuki. "Electrochemical Adsorption on Pt Nanoparticles in Alkaline Solution Observed Using In Situ High Energy Resolution X-ray Absorption Spectroscopy." Nanomaterials 9, no. 4 (April 20, 2019): 642. http://dx.doi.org/10.3390/nano9040642.

Full text

Abstract:

The oxygen reduction reaction (ORR) on Pt/C in alkaline solution was studied by in situ high energy resolution X-ray absorption spectroscopy. To discuss the X-ray absorption near-edge structure (XANES), this paper introduced the rate of change of the Δμ (RCD), which is an analysis method that is sensitive to surface adsorption. The surface adsorptions as hydrogen (below 0.34 V), superoxide anion (from 0.34 V to 0.74 V), hydroxyl species (from 0.44 V to 0.74 V), atomic oxygen (above 0.74 V), and α-PtO2 (above 0.94 V) were distinguished. It is clarified that the catalytic activity in an alkaline solution is enhanced by the stability of atomic oxygen and the low stability of superoxide anion/peroxide adsorption on the platinum surface.

APA, Harvard, Vancouver, ISO, and other styles

11

Yang, Hui Yong, and Qing Song Li. "Adsorption Characters of 17α-Ethynyestradiol by Activated Carbon." Advanced Materials Research 468-471 (February 2012): 767–70. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.767.

Full text

Abstract:

This paper studied the activated charcoal absorption EE2 characters by static absorption method. The result showed that EE2 can be removed effectively by activated carbon adsorption. Langmuir isothermal equation can describe the adsorption EE2 characters of activated charcoal well. The relativity adsorption coefficient reached marked or extremely marked level; compared with adsorption performances of different kinds of activated carbon coefficient, the adsorption capacity of PAC3# was the largest to EE2, The adsorption rate of PAC7# was the fastest, but the adsorption capacity of PAC7# was the smaller.

APA, Harvard, Vancouver, ISO, and other styles

12

Tvardovskii, A. V. "General approach to adsorption and absorption." Bulletin of the Academy of Sciences of the USSR Division of Chemical Science 40, no. 7 (July 1991): 1307–11. http://dx.doi.org/10.1007/bf00961220.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Smith, Gregory N., Isabelle Grillo, Sarah E. Rogers, and Julian Eastoe. "Surfactants with colloids: Adsorption or absorption?" Journal of Colloid and Interface Science 449 (July 2015): 205–14. http://dx.doi.org/10.1016/j.jcis.2014.12.048.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Anita Das Ravindranath. "Coir Pith – A Medium for Oil Absorption." CORD 35, no. 01 (April 1, 2019): 13. http://dx.doi.org/10.37833/cord.v35i01.9.

Full text

Abstract:

Coir pith, the byproduct of coconut husk, due to its abundance nature and its porous structure can be effectively used for oil adsorption. Modification of coir pith to make as hydrophobic may allow them to be used for oil adsorption. Oil spills can destroy marine aquatic life and have a great impact on environment. In this study coir pith have been treated enzymatically (Lipase, Protease & Glucanase) and chemically (Acetylation) to impart hydrophobicity and to enhance oil adsorption capacity. The coir pith samples were characterized periodically by FTIR, SEM. The extent of acetylation was evaluated by weight percent gain.The results suggests that acetylated coir pith could be beneficial in oil adsorption and potentially provide a low cost environmentally friend adsorbent for oil spill.

APA, Harvard, Vancouver, ISO, and other styles

15

Feng, Bing, Shuang Hong Liu, Guo Xu Chen, Kun Wang, and Pei Hua Shang. "Research on the Sorption of Anticorrosion and Antiwear Addtives on Surface of Axletree." Advanced Materials Research 291-294 (July 2011): 1284–88. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.1284.

Full text

Abstract:

Conduct simulative adsorption experiment with lubricating oil containing anticorrosion additive and axletree, measure the variation of which represents the absorption of anticorrosive on the surface of friction pairs, and then testify the adsorptive function of anticorrosive on the surface of friction pairs; By the adsorptive experiment conducted on lubricating oil containing anti-wear additive, find out that the competitive adsorptive relation between anti-wear additive and anticorrosive.

APA, Harvard, Vancouver, ISO, and other styles

16

Xu, Hui, Yao Xu, and Yong Chen. "Absorption of Eriochrome Blue Black on Polyaniline/Attapulgite Nanocomposites." Advanced Materials Research 194-196 (February 2011): 488–91. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.488.

Full text

Abstract:

Polyaniline/attapulgite (PANI/ATP) nanocomposites doped by hydrochloric acid (HCl) were prepared by in-situ polymerization method. The structure and absorption mechanism for eriochrome blue black of nanocomposite were investigated. Amount of absorbent and influence of pH for absorbent effect were also studied. The results reveal that the nanocomposites have not only the structure of ATP but also the property of the PANI. The nanocomposites hold an excellent adsorption for eriochrome blue black when the pH value is 5. The adsorption thermodynamics of the nanocomposites follows the Langmuir isothermal adsorption equation. The maximum adsorption capacity can reach 192.67mg/g. The calculate results show that the adsorption enthalpy is 4.15kJ/mol, the Gibbs free energy is (–22.98 to –19.26) kJ/mol, and the entropy of 81J/(mol·K), which imply that the adsorption is an endothermal and spontaneous process.

APA, Harvard, Vancouver, ISO, and other styles

17

Xiang, Hongzhong, Zixing Feng, Jianfei Yang, Fang Liang, Tao Zhang, Wanhe Hu, Bingbing Mi, Xiaomeng Yang, and Zhijia Liu. "N-doped porous carbon derived from bamboo fiber as a high-performance adsorbent for methylene blue." BioResources 14, no. 4 (September 19, 2019): 8765–84. http://dx.doi.org/10.15376/biores.14.4.8765-8784.

Full text

Abstract:

N-doped porous carbon materials derived from bamboo fibers (NBFCs) were synthesized through a simple simultaneous activation and carbonization method. The effects of the adsorbent dosage, absorption temperature, pH of the solution, initial concentration, and contact time on the absorption of methylene blue were investigated. The equilibrium, kinetics, isotherms, and thermodynamics of the adsorption process were also analyzed. The results showed that NBFC-800 had a good adsorption capacity of 816.0 mg/g and a high removal efficiency of 93.3% during the optimum absorption process with an adsorbent dosage of 0.8 g/L, adsorption temperature of 25 °C, initial concentration of 700 mg/L, and a solution pH of 9.0. The adsorption process included instantaneous adsorption or external surface adsorption, intraparticle diffusion, and an equilibrium process. Methylene blue adsorption of NBFC-800 agreed with the pseudo second-order model and belonged to the Langmuir isotherm model. The results will be useful for the development of high-performance NBFCs to efficiently remove methylene blue from wastewater.

APA, Harvard, Vancouver, ISO, and other styles

18

Deng, Jie, Ai He Wang, and Chun Zhang. "Study on Absorption Experiment of Methylene Blue by Nitrifying Peat." Applied Mechanics and Materials 209-211 (October 2012): 1969–72. http://dx.doi.org/10.4028/www.scientific.net/amm.209-211.1969.

Full text

Abstract:

A modified peat was prepared by using nitrate and natural peat from Yiyang city in Hunan Province. The adsorption properties of the nitrifying peat for Methylene blue was investigated in aqueous solution. The effect of the adsorbent dosage, time and the initial concentration of methylene blue on the adsorption capability was discussed. The result showed that time and the adsorbent dosage had greater influence on the adsorption of Methylene blue, the adsorption of Methylene blue by Nitrifying peat was a rapid process, and in 20 min in the adsorption rate reached more and 60%, the adsorption amount was approximately proportional to the initial concentration( 20-100 mg /L). Langmuir and Freundlich isotherms were used to fit the equilibrium data, and it was found that the adsorption isotherm followed the Langmuir model.

APA, Harvard, Vancouver, ISO, and other styles

19

Yan, Ke Le, Yu Lin, and Wang Qian. "Absorption Behavior of Methanol Vapor on the Silica Gels." Materials Science Forum 1003 (July 2020): 156–62. http://dx.doi.org/10.4028/www.scientific.net/msf.1003.156.

Full text

Abstract:

The adsorption behavior of methanol vapor onto three commercial silica gels named SG-1, SG-2 and SG-3 were investigated in this paper. The experimental results showed that SG-1 has the rich microporous, and the larger surface area and microporous volume than SG-2 and SG-3. The equilibrium adsorption data showed that the adsorption capacities of SG-1 was superior to SG-2 and SG-3 for lower concentration of methanol (<150 g/m3). However, SG-2 had higher adsorption capacities than SG-1 and SG-3 for higher concentration of methanol resulting from the condensation in mesopore channels. Three kinds of adsorption equilibrium equations including Langmuir equation, Freundlich equation and Dubinin-Astakov (D-A) equation were used to fit the methanol vapor adsorption isotherms. The results indicated that the experimental data can be well-fitted by D-A equation.

APA, Harvard, Vancouver, ISO, and other styles

20

Ulman, Abraham. "Surface Absorption of Monolayers." MRS Bulletin 20, no. 6 (June 1995): 46–51. http://dx.doi.org/10.1557/s0883769400036976.

Full text

Abstract:

When the first paper describing the formation of self-assembled monolayers (SAMs) of octadecyltrichlorosilane [CH3(CH2)17SCl3, or OTS] by adsorption on SiO2 was published, it could not have been predicted that this area of research would become so important in only one decade. Although Zisman was the first to discover that monolayers can be prepared by adsorption of a surfactant onto a clean metal surface, the real revolution in the field occurred when Nuzzo and Allara showed that SAMs of alkanethiolates on gold can be prepared by adsorption of di-n-alkyl disulfides from dilute solutions. A decrease in the use of moisture-sensitive alkyl trichlorosilanes and the increased use of crystalline gold surfaces were two important reasons for the success of these SAMs. Indeed, monolayers of alkanethiolates on gold are the most studied SAMs to date and thus deserve the most detailed discussion.SAMs have been intensively studied in the past few years because of their relevance to science and technology. Due to their dense and stable structure, SAMs have potential applications in corrosion prevention, wear protection, and biosensing, for example. The ability to tailor both head and tail groups of the constituent molecules makes them ideal for gaining a more fundamental understanding of phenomena affected by competing intermolecular, molecular-substrate, and molecule-solvent interactions like ordering and growth, wetting adhesion, lubrication, and corrosion.

APA, Harvard, Vancouver, ISO, and other styles

21

Liu, Tong, Yan Jun Li, Bao Liang Li, Yuan Chao Wu, Wei Shan Wang, and Xiao Cun Liu. "Study of Adsorptive Behaviors of Aminosulfonic Acid-Based Superplasticizer on the Calcium Sulphoaluminate Mineral." Advanced Materials Research 306-307 (August 2011): 1042–46. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.1042.

Full text

Abstract:

Calcium sulphoaluminate (3CaO·3Al2O3·CaSO4, ) was synthesized with pure chemical reagents. The adsorbed amount of aminosulfonic acid-based superplasticizer (AS) on the surface of mineral and the mineral mixture (mixture of the , Ca(OH)2and CaSO4·2H2O) were detected by ultraviolet-visible absorption spectrometry. The adsorptive behaviors of AS on the surface of mineral particles in the hydration system were studied. The results showed that: the adsorbed amount of AS on mineral and the mineral mixture increased with higher initial concentration; the adsorption amount and the maximum adsorption amount increased with prolonged hydration time; the adsorption amount and the maximum adsorption amount of AS on the mineral mixture was more than those on the mineral in the hydration system within the same hydration time.

APA, Harvard, Vancouver, ISO, and other styles

22

Liu, Chang, Shuai Shuai, Shuai Cao, Pengyu Wang, and Jiabin Cai. "Hygroscopic properties of six tree species with four tangential thicknesses." BioResources 17, no. 2 (April 6, 2022): 2959–76. http://dx.doi.org/10.15376/biores.17.2.2959-2976.

Full text

Abstract:

The differences of hygroscopic property among six tree species with four thicknesses were examined. The density, chemical composition, crystallinity, equilibrium moisture content (EMC), and moisture absorption rate were measured by static saturated salt solution method, and the isothermal moisture absorption curve was fitted by the H-H model to analyze monolayer molecular adsorption and multilayer molecular adsorption. The results show that under the same relative humidity (RH), the EMC of Picea asperata and Populus deltoides were increased with increasing thickness, while that of Quercus spp. and Xanthostemon melanoxylon were decreased. The moisture absorption rate of P. asperata was the largest and that of X. melanoxylon was the smallest. When RH ranged from 0 to 97%, the monolayer molecular adsorption water amount of samples with different thicknesses of the six tree species gradually became close. With the increase of tree species density, the monolayer molecular adsorption water amount of the thinner sample is gradually greater than that of the thicker sample. The change of multi-layer molecular adsorption water content is consistent with that of EMC, Moisture absorption rate, monolayer molecular adsorption water, and multilayer molecular adsorption water are related to the chemical composition content, density, and thickness of tree species.

APA, Harvard, Vancouver, ISO, and other styles

23

Santos, V. C. G. Dos, C. R. T. Tarley, J. Caetano, and D. C. Dragunski. "Assessment of chemically modified sugarcane bagasse for lead adsorption from aqueous medium." Water Science and Technology 62, no. 2 (July 1, 2010): 457–65. http://dx.doi.org/10.2166/wst.2010.291.

Full text

Abstract:

This study evaluated the adsorption capacity of chemically modified sugarcane bagasse with citric acid (B-CA), sodium hydroxide (B-S) and citric acid and sodium hydroxide (B-CAS) for Pb2 + ion adsorption in aqueous medium. Infrared spectroscopy (FT-IR) was used to characterise the materials, where the chemical modification was confirmed by the presence of carboxylate groups created at 1,730 cm−1 peak. All assays related to Pb2 + ion adsorption onto adsorbent, i.e. equilibrium time between Pb2 + ions and adsorbate (24 h), as well as Pb2 + ion concentration, were performed in batch system. The initial and final Pb2 + ion concentration after shaking time was determined by Flame Atomic Absorption Spectrometry (FAAS). Isotherm adsorptions were applied to Langmuir and Freundlich linear models and maximum adsorption capacity (MAC) of materials towards Pb2 + ions was calculated in function of modifications. A significant improvement regarding Pb2 + ion adsorption after the bagasse treatment with citric acid, in which MAC was 52.63 mg g−1, was observed. The adsorptions followed the behaviour described by the Langmuir linear model and its kinetics follow the behaviour described by the pseudo-second-order equation.

APA, Harvard, Vancouver, ISO, and other styles

24

Zuo, Ke Sheng, Jian Chao Liu, and Peng Shang. "Study on Cu²⁺ Absorption Characteristics of Bentonite - Acrylic Acid Resin." Advanced Materials Research 581-582 (October 2012): 685–88. http://dx.doi.org/10.4028/www.scientific.net/amr.581-582.685.

Full text

Abstract:

Bentonite has better heavy metallic ion adsorption capacity than most of other minerals. But bentonite suspension is stalbe and it makes the solid-liquid separation very difficult. To solve this problem, bentonite was fixed into the resin by copolymerizing with acrylic acid. The reaction mechanism and the effect of bentonite on the properties of the resin were studied. The results show that the addition of bentonite has similar effect on the water-absorption and Cu2+ adsorption properties of the resin. When the mass ratio of bentonite to acrylic acid is below 1∶2, the addition of bentonite improve the water absorption and Cu2+ adsorption properties, and the water absorption and Cu2+ adsorption properties decline with more bentonite added.

APA, Harvard, Vancouver, ISO, and other styles

25

Oktavianty, Herawati, and Didi Dwi Anggoro. "Adsorption Kinetics of Activated Carbon from Oil Palm Fronds on Decreasing of Copper and Lead Ions." E3S Web of Conferences 503 (2024): 09001. http://dx.doi.org/10.1051/e3sconf/202450309001.

Full text

Abstract:

One of the most common plantation biomass wastes is palm fronds, which will decompose without further processing. Lignin, hemicellulose, and cellulose contributed 31.7 percent, 33.9%, and 17.4%, respectively, of the chemical compounds found in oil palm leaves. The purpose of this study was to determine the ability of activated carbon to adsorb copper and lead metals, as well as to calculate its kinetics and adsorption capacity. Activated carbon with a certain amount is added to 50 ml of copper and lead metal solution for a certain time. The results obtained after the adsorption process were analyzed using Atomic Absorption Spectrophotometry (AAS). From the results of AAS analysis, it was found that activated carbon with a mass of 1.5 g and a contact time of adsorption for 40 minutes was the most effective in reducing the concentration of copper and lead metals. Copper metal adsorption follows Freundlich adsorption isotherm model while lead metal follows Langmuir adsorption isotherm model. The adsorption kinetics pattern of copper and lead metals follows second order kinetic adsorptions.

APA, Harvard, Vancouver, ISO, and other styles

26

Rahayu, Ulfi. "Kinetika Adsorpsi Zat Warna Direct Brown Menggunakan Hidroksiapatit Dengan Variasi Dosis Adsorben dan pH Larutan." Jurnal Ilmiah Teknik Kimia 5, no. 1 (January 25, 2021): 8. http://dx.doi.org/10.32493/jitk.v5i1.7390.

Full text

Abstract:

Adsorption is a dye absorption process using various adsorbents. Dye waste produced by industry can pollute the environment because it is dangerous and poisonous. In this study, calcium-deficient hydroxyapatite with a Ca / P ratio of more / less than 1.67 was used as the adsorption medium. Utilization of the adsorption process in dye absorption is useful for determining isotherm models and adsorption kinetics. The dye used is direct brown. The dye adsorption process was carried out at variations in pH (6, 7, 8) and adsorbent mass (0.1; 0.15; 0.2 wt%) at a rotating speed of 250 rpm and 30 ppm of dye concentration. The maximum adsorption capacity occurs at pH 6 with an absorption efficiency of 51.4%. The equilibrium model tested is the Langmuir, Freundlich, Harkins Jura, Temkin equilibrium model. and Dubinin-Raduskevich. The isotherm model of the direct brown dye adsorption process follows the Temkin model with a R2 value of 0.9996. The adsorption kinetics tested were Pseudo First Order, Pseudo Second Order, Elovich and Intraparticle Diffusion. The kinetics of the direct brown dye adsorption process followed the intraparticle diffusion order kinetics model with R2 value of 0.9938 in the adsorption process with a pH of 6 and an adsorbent mass of 0.5 grams.

APA, Harvard, Vancouver, ISO, and other styles

27

Srikacha, Nikom, Manop Sriuttha, Lamyai Neeratanaphan, Chatree Saiyasombat, and Bundit Tengjaroensakul. "The Improvement of Natural Thai Bentonite Modified with Cationic Surfactants on Hexavalent Chromium Adsorption from an Aqueous Solution." Adsorption Science & Technology 2022 (May 21, 2022): 1–15. http://dx.doi.org/10.1155/2022/4444164.

Full text

Abstract:

This work was performed to evaluate the adsorption properties of modified Thai bentonites (MTBs) on hexavalent chromium (Cr(VI)) by using a popularly capable surfactant (hexadecyltrimethylammonium bromide (HDTMA)) compared to an alternative surfactant (cetylpyridinium chloride (CPC)). The adsorption properties of the surfactant load, adsorbent weight, contact time, initial Cr(VI) concentration, and temperature of the MTBs were evaluated. The results revealed that a higher surfactant load significantly affected the Cr(VI) adsorption, and the equilibrium adsorption was achieved at 60 min. The adsorption capacity improved when the adsorbent weight, contact time, initial concentration, and temperature increased as the highest adsorption capacities of 1CPC and 1HDTMA were 45.55 and 46.03 mg g-1, respectively. The isotherm and kinetic adsorptions were described by the Freundlich model and pseudo-second-order model, respectively, while thermodynamics indicated endothermic adsorption. After adsorption, X-ray absorption near-edge structure and extended X-ray absorption fine structure data showed that Cr ions did not change the valency state between Cr(VI) and Cr(III). Additionally, the adsorption mechanism can be depicted as the ion exchange between the Cr(VI) ion and the surfactant molecule. Structural evaluations by XRD, FTIR, FESEM, EDS, and TEM found that both MTBs (1CPC and 1HDTMA) with the best adsorption performance for Cr(VI) had obvious changes at both the interlayer structure and the external surface. The interlayer spacing was expanded from 14.85 Å to 20.48 Å (1CPC) and 18.79 Å (1HDTMA), and the new functional groups (CH2 scissoring, C–H symmetric stretching, C–H asymmetric stretching, and N–CH3 scissoring) and elemental compositions (Br and Cl) were observed in both MTBs. They demonstrated that the complete intercalation of surfactant molecules on bentonite structures supported Cr(VI) adsorption. Overall, the data indicate that MTBs were perfectly adsorbed on Cr(VI), and CPC was demonstrated to be a cheap alternative agent due to its adsorption capacity compared to the popularly capable HDTMA.

APA, Harvard, Vancouver, ISO, and other styles

28

Jia, Na, and Chang Liu. "Research on Physical and Mechanical Performance and Formaldehyde Adsorption Characteristics of Self-Adsorption Fiber Board." Advanced Materials Research 113-116 (June 2010): 547–51. http://dx.doi.org/10.4028/www.scientific.net/amr.113-116.547.

Full text

Abstract:

The composite element method（CEM） is utilized to mix wood fiber and activated carbon into the self-adsorption fiber board under certain process condition. The density, bending strength, elastic modulus, internal bond strength and water absorption are tested under the same condition, at the same time, the formaldehyde emission rate is measured with desiccator method. The result shows that all the mechanical properties of self-adsorption fiber board are a bit higher than that of ordinary fiber board. The effect of formaldehyde self-absorption is highly related to the amount of added activated carbon instead of the form. Under the test condition, the emission of formaldehyde of the self-adsorption fiber board added with 10% activated carbon grain can be reduced by 35%. Further more, it is easier for the self-adsorption fiber board added with powder activated carbon to obtain even physical and mechanical performance and absorption effect.

APA, Harvard, Vancouver, ISO, and other styles

29

Meriatna, Meriatna, Sanda Mulia Utari, Rizka Mulyawan, Muhammad Muhammad, and Zulmiardi Zulmiardi. "Methyl Orange Absorption Using Chitosan from Shrimp Skin as an Adsorbent." International Journal of Engineering, Science and Information Technology 3, no. 2 (April 19, 2023): 25–30. http://dx.doi.org/10.52088/ijesty.v3i2.431.

Full text

Abstract:

In the coloring process, the textile industry generally uses synthetic (artificial) dyes, methyl orange (MO). In this study, the adsorption of methyl orange (MO) dye with chitosan was investigated in a series of batch laboratory studies. The adsorption equilibrium study used a MO solution with a concentration of 10 to 50 mg/L with an adsorbent weight of 3 g put into an Erlenmeyer and shaken until the adsorption reached an equilibrium condition. Meanwhile, the adsorption kinetics used a MO solution with an initial concentration of 10 and 20 mg/L with a volume of 100 mL with an adsorbent weight of 3 g and the solution was adjusted to pH 2. Effective operating parameters such as pH, initial concentration of dye (C0) and contact time at adsorption has been investigated. The results showed that the adsorption capacity of methyl orange (MO) dye from chitosan increased with an increasing acid content, and it was found that a solution of pH 2 was the optimal pH value for MO adsorption. The adsorption parameters for the Langmuir and Freundlich isotherms were determined by nonlinear regression and the equilibrium data were best explained by the Langmuir isotherm model, this was indicated by the high value of the correlation coefficient (R2), which was 0.9595. The maximum adsorption capacity was 0.1297 mg/g. Adsorption kinetics can be successfully applied to pseudo second-order kinetic models. The pseudo second-order model results show that the adsorption process is controlled by chemical sorption (chemisorption).

APA, Harvard, Vancouver, ISO, and other styles

30

Burda, C., and Mostafa A. El-Sayed. "High-density femtosecond transient absorption spectroscopy of semiconductor nanoparticles. A tool to investigate surface quality." Pure and Applied Chemistry 72, no. 1-2 (January 1, 2000): 165–77. http://dx.doi.org/10.1351/pac200072010165.

Full text

Abstract:

At the high laser excitation intensities used in our experiments, more than 50 electron-hole pairs are formed in colloidal semiconductor nanoparticles used in our studies. At this density of charge carriers, new transient absorptions are observed in the femtosecond transient spectra in the 450 to 700 nm region with unresolved fast rise (<100 fs) and two decay components of 660 fs and >150 ps. The absorption at 510 nm could be quenched with the adsorption of electron acceptors (e.g., benzoquinone, 1,2-naphthoquinone), whereas the low-energy transient absorption was not affected. For CdS NPs, we found that passivation eliminated most of the transient absorption. The transient absorptions are thus proposed to result from either trap-state absorption, trapped dimers (or complexes) and/or Stark-shifted exciton absorption resulting from surface electric field of the uncompensated trapped electron-hole pairs. All these possibilities require effective surface trapping at these high levels of excitation.

APA, Harvard, Vancouver, ISO, and other styles

31

Erika Mulyana Gultom and M. Turmuzi Lubis. "APLIKASI KARBON AKTIF DARI CANGKANG KELAPA SAWIT DENGAN AKTIVATOR H3PO4 UNTUK PENYERAPAN LOGAM BERAT Cd DAN Pb." Jurnal Teknik Kimia USU 3, no. 1 (March 31, 2014): 5–10. http://dx.doi.org/10.32734/jtk.v3i1.1493.

Full text

Abstract:

This research aims to determine the optimum conditions ofactivated carbon made of palm shells activated with H3PO4as an absorber of heavy metals such as Cd and Pb. The research methodology includes the preparation of activated carbon, absorption, and testing. Absorption stage is done by varying the concentration of heavy metals are 5 ppm, 10 ppm, 15 ppm, 20 ppm and activated carbon mass per run, which is0.5 grams. Another variable are the contact time with intervals of 5 minutes and the pH arranged heavy metals 2-9. Testing activated carbon absorption to heavy metals using atomic adsorption spectrofotometric (AAS). The results showed that the most optimum absorption is concentration of 10 ppm, 40 minutes and pH absorption3-4. Absorption of heavy metals Cd and Pb obtained 84,61 % and 80,13 %.

APA, Harvard, Vancouver, ISO, and other styles

32

Ding, Chun Sheng, Fang Ming Ni, Hui Ye Cai, Qian Fen Zhu, and Ying Long Zou. "Study on the Absorption Action of Modified Activated Carbon for Phenol." Advanced Materials Research 113-116 (June 2010): 1981–85. http://dx.doi.org/10.4028/www.scientific.net/amr.113-116.1981.

Full text

Abstract:

To improve the adsorption efficiency of activated carbon for phenol, copper nitrate was used to modify activated carbon. In detail, the absorption properties of modified activated carbon was studied by investigating the effects of adsorption time, pH, amount of modified activated carbon and initial concentration of phenol on the adsorption. And the dynamic and adsorbent model were obtained and explored. It shows that the removal rate of modified activated carbon for phenol was higher than the unmodified carbon, and the best removal rate can be obtained under the conditions of pH about 5, adsorption time of 2h, modified activated carbon dosage of 1.0g. The quasi-two rate equation was better to reflect the dynamics of modified activated carbon for phenol, with the initial concentration of phenol increased, equilibrium adsorption capacity and initial adsorption rate were greater. Both Freundlich and Langmuir model could reflect the adsorption behavior of modified activated carbon for phenol, while the Langmuir model was more properly.

APA, Harvard, Vancouver, ISO, and other styles

33

Sylvia, Novi, Lia Sobrina, and Nasrun Nasrun. "Optimasi Proses Penyerapan CO2 dengan Adsorben Karbon Aktif Menggunakan Computational Fluid Dynamics (CFD) dan Response Surface Methodology (RSM)." Jurnal Teknologi Kimia Unimal 8, no. 1 (October 11, 2019): 69. http://dx.doi.org/10.29103/jtku.v8i1.1918.

Full text

Abstract:

Biogas purification from carbon dioxide compounds due to can reduce the calorific value of methane (CH4). One application used in this case is adsorption using activated carbon. This study aims to simulate the absorption of CO2 using ANSYS R19.0 and to analyze percent adsorption, adsorption capacity and isothermal adsorption. Based on variations in bed height, flow rate and pressure, the highest percent percussion occurs at 10 cm bed height, 50 cm3/minute flow rate with a pressure of 1.4 atm and the lowest percent absorption occurs at 6 cm bed height, 150 cm3/minute flow rate with a pressure of 1.2 atm. Whereas the maximum absorption capacity occurs at 8 cm bed height, 50 cm3/minute flow rate at a pressure of 1.4 atm and minimum absorption capacity occurs at 8 cm bed height, flow rate of 150 cm3/minute at a pressure of 1 atm. This adsorption process occurs in the Langmuir isotherm with R2 approaching 1, which is equal to 0.9151. The optimization results were obtained at a flow rate of 50 cm3/minute, bed height 9.46 cm and 1.4 atm pressure.

APA, Harvard, Vancouver, ISO, and other styles

34

Mohamad, Erni, Intan J. Oputu, and Julhim S. Tangio. "Pemanfaatan Gulma Siam (Chromolaena odarata L.) Sebagai Adsorben Logam Timbal." Jambura Journal of Chemistry 2, no. 1 (July 7, 2020): 27–34. http://dx.doi.org/10.34312/jambchem.v2i1.4528.

Full text

Abstract:

This study aims to utilize (Chromolaena odorata L) as a metal adsorbent. The methods used to make activated charcoal are dehydration, carbonization, and activation. The activated carbon is then characterized to obtain activated charcoal that can be applied, then optimized. The results of activated carbon characterization obtained have reached the activated carbon quality requirements based on the Indonesian Industry Standard (SII No. 0258-88). Based on the adsorption test, the optimum pH of Pb2+ (Pb (NO3) 2 (in distilled water) Chromolaena odorata L charcoal activated by NaOH 0.2 M under varying pH (2,3,4,5,6) is at pH 5 with 69.00% absorption. The optimum contact time required for Pb ion adsorption is 4 hours at variation (1-5 hours) with 70.19% absorption. The optimum concentration at variation (concentration 20; 40; 60; 80; 100 ppm) on Pb ion adsorption is 100 ppm with 76.15% absorption. The optimum heating time is a variation of 1.5; 2; 2.5; and 3 hours of Pb ion adsorption is one hour 30 minutes with an absorption of 65.95%. Based on the optimization results, the activated carbon from the Chromolaena odorata L can be used as an adsorption material against the contamination of lead heavy metals (Pb).

APA, Harvard, Vancouver, ISO, and other styles

35

Smittenberg, J. "Absorption and adsorption of hydrogen by Nickel." Recueil des Travaux Chimiques des Pays-Bas 53, no. 12 (September 3, 2010): 1065–83. http://dx.doi.org/10.1002/recl.19340531202.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Luo, Yingjie, Yiwei Zhang, Cimin Tao, Hongfei Ni, Xuesong Liu, Yong Chen, Yongjiang Wu, Hang Song, and Tengfei Xu. "Exploring the Absorption Mechanisms of Imidazolium-Based Ionic Liquids to Epigallocatechin Gallate." International Journal of Molecular Sciences 23, no. 20 (October 20, 2022): 12600. http://dx.doi.org/10.3390/ijms232012600.

Full text

Abstract:

Imidazolium-based ionic liquids are wildly used in natural product adsorption and purification. In this work, one typical polymeric ionic liquid (PIL) was synthesized by using L-proline as the anion, which exhibited excellent adsorption capacity toward tea polyphenol epigallocatechin gallate (EGCG). The adsorption conditions were optimized with the response surface method (RSM). Under the optimum conditions, the adsorption capacity of the PIL for EGCG can reach as high as 552 mg/g. Dynamics and isothermal research shows that the adsorption process of EGCG by the PIL particularly meets the quasi-second-order kinetic equation and monolayer adsorption mechanism. According to thermodynamic parameter analysis, the adsorption process is endothermic and spontaneous. The results of theoretical calculation by molecular docking also demonstrated the interaction mechanisms between EGCG and the ionic liquid. Considering the wide application of imidazolium-based ionic liquids in component adsorption and purification, the present study can not only be extended to other similar experimental mechanism validation, but also be representative for guiding the synthesis of PIL and optimization of adsorption conditions.

APA, Harvard, Vancouver, ISO, and other styles

37

Riski, Fahrul, Irwan Said, Afadil Afadil, and Purnama Ningsih. "Activation of Durian Skin Biomass with H2SO4 Activator on the Absorption of Lead from its Solution." Jurnal Akademika Kimia 12, no. 1 (February 28, 2023): 44–51. http://dx.doi.org/10.22487/j24775185.2023.v12.i1.pp44-51.

Full text

Abstract:

Research has been carried out on the bioabsorption of lead (Pb) using durian skin biomass (Durio zibethinus) which has been activated using an H2SO4 activator. The durian skin sample used was durian skin from Central Sulawesi. The processing technique to remove lead (Pb) from liquid waste was carried out by an adsorption process. The adsorption process is an effective purification and separation technique used in industry because it is more economical and simple in treating wastewater and is a technique that is often used to reduce metal ions in wastewater. This study aims to determine the mass and contact time of the adsorption of Pb by durian skin biomass. Determination of the adsorbed metal used atomic absorption spectrophotometry (AAS). The results obtained showed that the optimal Pb ion adsorption occurred at a weight of 2.5 grams with an absorption capacity of 99.94 %. While the optimal Pb ion adsorption occurred at a contact time of 40 minutes with an absorption capacity of 99.94 %

APA, Harvard, Vancouver, ISO, and other styles

38

Yu, Xiao Hua, Hai Liang Lü, Guo Wei Zhou, Li Guo Zhou, and Yong Chun Zhang. "Absorption of Methyl Orange by Modified Fly Zeolites." Advanced Materials Research 476-478 (February 2012): 1365–69. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.1365.

Full text

Abstract:

In the present study, three kinds of zeolite (NaP1, NaA, and NaX) were synthesized by a hydrothermal method. These zeolites were modified by cetyl trimethyl-ammonium bromide (CTAB), and used to adsorb methyl orange (MO). NaP1 had the highest adsorption capacity, with a 99.7% MO removal percentage. An orthogonal experiment was conducted to determine the influence of adsorbent dosage, solution pH, initial MO concentration, contact time, and solution temperature on NaP1. The results showed that the initial MO concentration had the most significant effect. The adsorption isotherms of the zeolites are in a good agreement with the Langmuir formula, and the adsorption mechanism is also discussed.

APA, Harvard, Vancouver, ISO, and other styles

39

Han, Feng, Wen Hong Li, Xuan Tang, and Dong Li. "Absorption Equilibrium and Thermodynamics of Fenugreek Yellow Pigment on Macroporous Resins." Advanced Materials Research 233-235 (May 2011): 91–94. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.91.

Full text

Abstract:

The adsorption equilibrium and thermodynamics of pigment extracted from Fenugreek after degumming on macroporous resins was investigated under differentinitial concentrations. The suitability of the Freundlich and Langmuir adsorption models to the equilibrium data was investigated. The model fitness was determined by R2 . Thermodynamic parameters were calculated by the Van’t Hof equation.The results showed that Freundlich model gave a better fit of adsorption isotherms than Langmuir models. The positive value of enthalpy(∆H) indicated that the adsorption was endothermic, the negative value of Gibbs free energy (∆G) showed the spontaneous and favoured nature of adsorption, and the entropy(∆S) was positive.The resins LS-46 showed an effective adsorbtion for Fenugreek yellow pigment.

APA, Harvard, Vancouver, ISO, and other styles

40

Pan, Qing Shan, Wei Liu, Mei Gui Ma, He Ping Yan, Bo Zhou, Du Shu Huang, Bao Sen Wang, Na Wu, Ling Shi, and Shi Juan Xu. "Preparation of Modified Corncobs by Citric Acid and Study on the Adsorption of Cr (VI)." Advanced Materials Research 726-731 (August 2013): 2260–63. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.2260.

Full text

Abstract:

The modified corncobs was prepared by using citric acid. Conditions of preparation, the effects of pH, initial concentrations of Cr (VI) and adsorption time to adsorption of Cr (VI) was studied. Results show that when citric acid concentration at 3molL-1, heating treatment temperature at 160°C, the treatment time at 2h, the modified corncobs had a high adsorption of Cr (VI). At room temperature, Cr (VI) initial concentration at 10 mgL-1, medium aqueous solution pH at 2.5, adsorption time at 150min, the absorption rate of modified corncobs for Cr (VI) was 96.13%, higher than absorption rate of ordinary corncobs for 22.83%.

APA, Harvard, Vancouver, ISO, and other styles

41

Xu, Hui, Dong Hong Guo, and Yao Xu. "Removal of Cu(II) Ions from Aqueous Solution by KH-570 Modified Attapulgite Clay." Advanced Materials Research 320 (August 2011): 275–79. http://dx.doi.org/10.4028/www.scientific.net/amr.320.275.

Full text

Abstract:

Attapulgite clay (ATP) was modified by Silane coupling agent (KH-570) to creat more efficient sites for Cu(II) adsorption. The natural and KH-570 modified attapulgite clay were characterized by Fourier transform infrared spectrometer (FTIR) and SEM. The effects of various experimental parameters such as the amount of modifier, the quality of KH-570 modified ATP, adsorption time, adsorption temperature on Cu(II) adsorption onto KH-570modified ATP were studied in detail. The results showed that the 30% of modifier (The quality of the modifier mass fraction attapulgite) had the best adsorption capacity. When the dosage of modified attaplgite clay was 0.5g and the absorption time was 240min under 20°C, the adsorption rate of Cu(II) in wastewater approached 97%. Meanwhile, the type of absorption was Langmuir isotherm. Desorption experiments showed that the adsorption mechanism of KH-570 modified ATP to Cu(II) was the chemical adsorption.

APA, Harvard, Vancouver, ISO, and other styles

42

Cai, Zhenzhen, Jun Wang, Xuyin Lin, and Tuanyu Guo. "Rapid and Effective Absorption of Mercury(II) in Aqueous Solution Using CuS Composites Supported by SiO2 Aerogel." International Journal of Engineering and Technology 15, no. 3 (August 2023): 123–26. http://dx.doi.org/10.7763/ijet.2023.v15.1233.

Full text

Abstract:

Nowadays, pollution caused by heavy metals has become an urgent problem to be solved today, especially Hg(II) in heavy metals can cause diarrhea, neurological weakness and serious life threatening. Therefore, new materials are urgently needed to adsorb Hg(II) ions in water. Herein, we loaded sulfide (CuS) particles onto SiO2 aerogel obtained from boron slag, which was used to prepare new SiO2/CuS adsorbents. The influence of pH in the solution, the initial Hg(II) ion concentration, contact time, and co-existing cations on the adsorption behavior of mercury(II) ions by SiO2/CuS was investigated. At the optimal conditions, the removal rate and adsorption amount of mercury(II) ions by SiO2/CuS reached 93.16% and 232.90 mg/g within 60 min. The results show that the adsorption process of SiO2/CuS is consistent with the PSO model. The adsorption mechanism of SiO2/CuS on Hg(II) ions is a chemisorption process.

APA, Harvard, Vancouver, ISO, and other styles

43

Chen, Hongbin, Wangmiao Fu, Xiang Yu, Yi Zhu, Hui Meng, Jinpeng Tang, and Yuanming Zhang. "One-Step Synthesis of Immobilized BiOCl Film with Excellent Adsorption Capacity for Dyes." Nano 10, no. 08 (November 23, 2015): 1550119. http://dx.doi.org/10.1142/s1793292015501192.

Full text

Abstract:

A facile one-step method was developed for the first time to fabricate BiOCl film on Cu substrate by simply dipping the Cu substrate in the mixed solution containing HCl, glycol, H2O2 and BiCl3. This method shows the advantages of a simple technique, uniform and controllable morphology, as well as easy mass production. The absorption capacity of BiOCl film was investigated by adsorption of Rhodamine B and Congo red (CR) and their maximum adsorption capacities were 1667[Formula: see text]mg[Formula: see text]g[Formula: see text] and 1429[Formula: see text]mg[Formula: see text]g[Formula: see text], respectively. The negative values of free energy and the positive values of enthalpy suggested that the adsorption were spontaneous and endothermic, respectively. Moreover, both adsorptions were matched with the pseudo-second-order equation. This film could be reused and the recycle rates for Rhodamine B and CR were still about 95% and 75% after five cycles, respectively. The adsorption mechanism revealed that hydrogen bond mainly accounted for the adsorption of dyes.

APA, Harvard, Vancouver, ISO, and other styles

44

Jasmidi, Jasmidi, Moondra Zubir, Rini Selly, Putri Faradilla, and Siti Rahmah. "Adsorption Properties of Beta Carotene from Activated Carbon Derivatives of Oil Palm Empty Bunches." Indonesian Journal of Chemical Science and Technology (IJCST) 7, no. 1 (March 1, 2024): 08. http://dx.doi.org/10.24114/ijcst.v7i1.56436.

Full text

Abstract:

This research aims to determine the adsorption ability of activated carbon and Fe-Cu modified activated carbon in the β-carotene adsorption process on Crude Palm Oil (CPO). Empty Palm Oil Bunches (TKKS) are used as a bio-sorbent for carbon production at a temperature of 500 ºC. The synthesized carbon was activated using H3PO4 and modified with Fe-Cu metal. CPO quality parameters such as Free Fatty Acids and Peroxide Number were analyzed to see the effect of adsorption on CPO quality. The β-carotene level in the CPO sample used is 472.1 ppm. The optimum conditions for using activated carbon in the β-carotene adsorption process are a mass variation of 8 grams with the β-carotene remaining after adsorption being 432.4 ppm, whereas by using Magnetic Activated Carbon, CPO β-carotene after adsorption remains at 426.1 ppm. Meanwhile, increasing the adsorption time causes the absorption of β-carotene to become greater. By using Activated Carbon the remaining β-carotene is 300.1 ppm after 120 minutes, whereas by using Magnetic Activated Carbon the optimum absorption time is faster and the amount of β-carotene absorbed is greater. The remaining βcarotene after absorption with Magnetic Activated Carbon was 288.7 after 90 minutes of adsorption. Apart from being able to absorb β-carotene, magnetic activated carbon is also better at reducing FFA and PV levels from CPO.

APA, Harvard, Vancouver, ISO, and other styles

45

Sorrells, Matthew G., and Keith B. Neeves. "Adsorption and Absorption of Collagen Peptides to Polydimethlysiloxane and Its Influence on Platelet Adhesion Flow Assays." Micromachines 11, no. 1 (January 5, 2020): 62. http://dx.doi.org/10.3390/mi11010062.

Full text

Abstract:

Collagen peptides are an alternative to animal derived collagens for platelet function studies under flow. The purpose of this study was to examine the use of collagen peptides in polydimethylsiloxane (PDMS) devices. Three collagen peptides with amino acid sequences and structures that capture von Willebrand factor and bind it with the platelet receptors integrin α2β1 and glycoprotein VI were patterned on glass, silicon, and PDMS. Each of these surfaces was also functionalized with tridecafluoro-1,1,2,2-tetrahydrooctyltrichlorosilane (FOTS). Surfaces were characterized by their ability to support platelet adhesion, topology by atomic force microscopy, contact angle, and peptides absorption. PDMS readily absorbs collagen peptides, depleting them from solution, thus reducing their adsorption to glass and silicon substrates when used for micropatterning. Treatment of PDMS with FOTS, but not bovine serum albumin or poloxamer 407, inhibits collagen peptide absorption and supports adsorption and platelet adhesion at venous and arterial shear rates. Similarly, FOTS treatment of glass or silicon supports collagen peptide adsorption even in the presence of untreated PDMS. In conclusion, PDMS acts as an absorptive sink for collagen peptides, rendering a non-adhesive surface for platelet adhesion and competing for peptides when used for micropatterning. The absorption of collagen peptides can be overcome by functionalization of PDMS with a fluorinated alkyl silane, thus allowing its use as a material for micropatterning or as a surface for platelet adhesion flow assays.

APA, Harvard, Vancouver, ISO, and other styles

46

Yu, Li Li, and Lin Yao. "Adsorption of Cu (II) on Thiourea Impregnated Gelatin Microspheres." Advanced Materials Research 634-638 (January 2013): 187–91. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.187.

Full text

Abstract:

In this study, we describe a novel adsorbent, thiourea impregnated gelatin microspheres(TIGM) which were synthesized from thiourea impregnated gelatin by inverse suspension polymerization with glutaraldehyde as crosslinker. With the aim to investigate the absorption kinetics of Cu(II) on TIGM, the absorption equilibrium, the effects of temperature on the absorption was fully discussed. It was found that this adsorbent is effective for the removal of Cu(II) from aqueous solutions. Results of the experiments presented that the thiourea was uniformly dispersed in microspheres mainly through chemical bonds, and the adsorption isotherms of Cu(II) on TIGM fits well both with the classical Freundlich equation and the Langmuir equation. It was also suggested that the adsorption rate of Cu (II) was faster at higher temperature, and the amount of the adsorption also increases with the increasing of temperature. According to the research, the maximal adsorption capacity is obtained when pH is 5 to 9, and the adsorption kinetics of Cu(II) onto TIGM could be described by pseudo-first-order rate mode.

APA, Harvard, Vancouver, ISO, and other styles

47

Wang, Dongli, Siqing Liu, Bingqiang Dong, Lili Yuan, Huimin Pan, and Qingxin Zhao. "Research Progress on Factors Affecting Oil-Absorption Performance of Cement-Based Materials." Materials 16, no. 8 (April 17, 2023): 3166. http://dx.doi.org/10.3390/ma16083166.

Full text

Abstract:

With the wide application of petroleum resources, oil substances have polluted the environment in every link from crude oil extraction to utilization. Cement-based materials are the main materials in civil engineering, and the study of their adsorption capacity for oil pollutants can expand the scope of functional engineering applications of cement-based materials. Based on the research status of the oil-wet mechanism of different kinds of oil-absorbing materials, this paper lists the types of conventional oil-absorbing materials and introduces their application in cement-based materials while outlining the influence of different oil-absorbing materials on the oil-absorbing properties of cement-based composites. The analysis found that 10% Acronal S400F emulsion can reduce the water absorption rate of cement stone by 75% and enhance the oil-absorption rate by 62%. Adding 5% polyethylene glycol can increase the oil–water relative permeability of cement stone to 1.2. The oil-adsorption process is described by kinetic and thermodynamic equations. Two isotherm adsorption models and three adsorption kinetic models are explained, and oil-absorbing materials and adsorption models are matched. The effects of specific surface area, porosity, pore interface, material outer surface, oil-absorption strain, and pore network on the oil-absorption performance of materials are reviewed. It was found that the porosity has the greatest influence on the oil-absorbing performance. When the porosity of the oil-absorbing material increases from 72% to 91%, the oil absorption can increase to 236%. In this paper, by analyzing the research progress of factors affecting oil-absorption performance, ideas for multi-angle design of functional cement-based oil-absorbing materials can be obtained.

APA, Harvard, Vancouver, ISO, and other styles

48

Fan, Zhen Zhong, Zhe Ming Zhang, Xian Tao Zeng, Qing Wang Liu, Ji Gang Wang, Rui Gao, and Ling Da Kong. "Laboratory Study on the Static Absorption of Cationic Gemini Surfactant CGS on Quartz Sand." Applied Mechanics and Materials 295-298 (February 2013): 1414–18. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.1414.

Full text

Abstract:

Adsorption isotherms of new type cationic Gemini surfactant named CGS on quartz sand has been got by using solution concentration difference method. The effect of different factors on adsorption, such as temperature, pH value and salinity, are studied too. The adsorption isotherm of CGS on quartz sand accorded with Langmuir shape. The adsorption quantity increased with the increasing of surfactant concentration at an adagio rate, then the adsorption quantity increased fast, and it reached adsorption saturation when mass concentration was 150 mg/L, and saturated absorption was 6.3 mg/g. The adsorption quantity of CGS increased with the increasing of salt concentration. When heighten temperature and pH value, the adsorption quantity of CGS decreased.

APA, Harvard, Vancouver, ISO, and other styles

49

Choi, Sung-kyu, Min-jun Kim, Tae-geon Kim, and Tae-jin Lee. "Removal of Heavy Metals (Fe, Mn and Cd) from Aqueous Solutions by Natural Zeolite and FeS Media." Journal of Korean Society of Environmental Engineers 43, no. 7 (July 31, 2021): 524–36. http://dx.doi.org/10.4491/ksee.2021.43.7.524.

Full text

Abstract:

Objectives : The adsorption characteristics of Fe, Cd, and Mn in aqueous solution using zeolite and FeS media were investigated by the adsorption isotherm and kinetic model analysis.Methods : The adsorption characteristics of the heavy metals (Fe, Mn, Cd) were investigated using Langmuir or Freundlich adsorption isotherm. The analysis of pseudo-first or pseudo-second order reaction was also attempted to evaluate the rate limiting factor such as molecular diffusion or chemical adsorption on the absorbents.Results and discussion : The adsorption of the heavy metals on the zeolite and FeS media was more suitable for the Langmuir adsorption isotherm, representing that mono-layer absorption on the surface and no interaction between the absorbed solutes. The order of adsorption preference to zeolite was Fe > Cd > Mn, whereas the order of adsorption preference to FeS media was Cd > Fe > Mn. The adsorption kinetics of zeolite and FeS media were more suitable for pseudo-secondary reactions than for pseudo-primary reaction.Conclusions : The absorption capacity of FeS media for the heavy metals (Fe, Cd and Mn) in aqueous solution was higher than that of zeolite. The adsorption pattern was suitable for the Langmuir adsorption isotherm, and has kinetic characteristic by chemisorption.

APA, Harvard, Vancouver, ISO, and other styles

50

Григорьев, L. Grigorev, Шанова, O. Shanova, Веренцова, L. Verentsova, Родионова, and A. Rodionova. "Wastewater Treatment from Laevomycetin by Adsorption Method." Safety in Technosphere 6, no. 1 (May 15, 2017): 51–57. http://dx.doi.org/10.12737/article_59019a3ee0b2d8.63198295.

Full text

Abstract:

Has been presented the data on laevomycetin absorption from aqueous solution in static and dynamic conditions on industrial active carbons AG‑5 and BAU-A in a wide range of concentrations. It has been shown that the calculation of adsorption’s equilibrium value and process duration at the concentration of 25–200 mg·dm–3 with sufficient accuracy can be performed using Dubinin–Radushkevich–Astakhov and Dubinin–Nikolaev equations respectively. Have been proposed equations for levomycetin adsorption value calculation depending on the carbons’ micropores volume, as well as for a characteristic energy depending on the pores size.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Absorption and adsorption'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles