Journal articles: 'Adsorption process'

1

Feng, Zhi Biao, Ren Jiao Han, and Jing Long Wang. "Studies on Adsorption of Tyrosine on Multi-Wall Carbon Nanotubes." Advanced Materials Research 179-180 (January 2011): 1396–401. http://dx.doi.org/10.4028/www.scientific.net/amr.179-180.1396.

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The thermodynamics and kinetics properties and mechanism of sorption process were studied for adsorpting tyrosine in aqueous solution with multi-wall carbon nanotubes (MWCNTs), and the adsorption isotherms at different temperatures were determined. The results showed that the adsorption of the tyrosine in aqueous solution obeys well with the Freundlich isotherm, The thermodynamic parameters indicated that the adsorption reaction was a spontaneous, exothermal and decreasing entropy process,and the adsorption process had an obvious physisorption characteristic.The pseudo-second-order equation provided the best correlation for the adsorption process, being in agreement with adsorption as the rate controlling step.

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Kaleta, Jadwiga. "Removal of phenol from aqueous solution by adsorption." Canadian Journal of Civil Engineering 33, no. 5 (May 1, 2006): 546–51. http://dx.doi.org/10.1139/l06-018.

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The paper presents the results of laboratory tests concerning the possibility of utilizing activated carbon produced in Poland and nonconventional adsorbents, such as modified Clarion clay and clinoptylolite, for removing organic phenol from water. The effect of contact time and pH of the model solution on the adsorption process was assessed during tests conducted under static conditions. A contact time of 30 min was considered as optimum, and the highest efficiency of the adsorption process was achieved using a pH of 7.0. Adsorbent doses affected the course and effectiveness of the adsorption process. The adsorption processes were best described by the Freundlich isotherm. On the basis of the isotherms, the adsorptive capacity of tested adsorbents was calculated. Activated carbon had an adsorptive capacity of 13.22 g/kg, modified Clarion clay 1.24 g/kg, and clinoptylolite 0.23 g/kg. The through-flow conditions were achieved by column filtration. On the basis of breakthrough curves, the adsorptive capacities were higher than those determined through static conditions, namely 61.23, 23.56, and 2.99 g/kg for activated carbon, modified Clarion clay, and clinoptylolite, respectively. Despite their inferior adsorptive characteristics, the modified Clarion clay and clinoptylolite may be applied in filtration systems prior to filters with activated carbon.Key words: phenol, adsorption process, activated carbon, modified clay, clinoptylolite.

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Gugushe, Aphiwe Siyasanga, Azile Nqombolo, and Philiswa N. Nomngongo. "Application of Response Surface Methodology and Desirability Function in the Optimization of Adsorptive Remediation of Arsenic from Acid Mine Drainage Using Magnetic Nanocomposite: Equilibrium Studies and Application to Real Samples." Molecules 24, no. 9 (May 9, 2019): 1792. http://dx.doi.org/10.3390/molecules24091792.

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A magnetic multi-walled carbon nanotube/zeolite nanocomposite was applied for the adsorption and removal of arsenic ions in simulated and real acid mine drainage samples. The adsorption mechanism was investigated using two-parameter (Langmuir, Freundlich, Temkin) and three-parameter (Redlich–Peterson, and Sips) isotherm models. This was done in order to determine the characteristic parameters of the adsorptive removal process. The results showed that the removal process was described by both mono- and multilayer adsorptions. Adsorption studies demonstrated that a multi-walled carbon nanotube/zeolite nanocomposite could efficiently remove arsenic in simulated samples within 35 min. Based on the Langmuir isotherm, the adsorption capacity for arsenic was found to be 28 mg g−1. The nanocomposite was easily separated from the sample solution using an external magnet and the regeneration was achieved by washing the adsorbent with 0.05 mol L−1 hydrochloric acid solution. Moreover, the nanoadsorbent was reusable for at least 10 cycles of adsorption-desorption with no significant decrease in the adsorption capacity. The nanoadsorbent was also used for the arsenic removal from acid mine drainage. Overall, the adsorbent displayed excellent reusability and stability; thus, they are promising nanoadsorbents for the removal of arsenic from acid mine drainage.

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Akulinin, E. I., A. A. Ishin, S. A. Skvortsov, D. S. Dvoretsky, and S. I. Dvoretsky. "Mathematical Modeling of Hydrogen Production Process by Pressure Swing Adsorption Method." Advanced Materials & Technologies, no. 2 (2017): 038–49. http://dx.doi.org/10.17277/amt.2017.02.pp.038-049.

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Higgins, Carlyn J., and Steven J. Duranceau. "Removal of Enantiomeric Ibuprofen in a Nanofiltration Membrane Process." Membranes 10, no. 12 (November 30, 2020): 383. http://dx.doi.org/10.3390/membranes10120383.

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A study of the behavior of R- and S-enantiomers of ibuprofen (R-IBU and S-IBU) in aqueous solution by nanofiltration (NF) membranes revealed that up to 23% of the pharmaceutical was adsorbed onto the stainless steel equipment of a flat-sheet experimental unit. Mass balances disclosed that IBU’s S-enantiomer was primarily responsible for the adsorption onto the equipment. Additional IBU adsorption was also experienced on the NF membrane coupons, verified by increased contact angle measurements on the surfaces. The IBU-equipment adsorptive relationship with and without the membrane coupon were best described by Freundlich and Langmuir isotherms, respectively. At a feed water pH of 4.0 units and racemic µg/L IBU concentrations, NF removal ranged from 34.5% to 49.5%. The rejection of S-IBU was consistently greater than the R-enantiomer. Adsorption onto the surfaces influenced NF rejection by 18.9% to 27.3%. The removal of IBU displayed a direct relationship with an increase in feed water pH. Conversely, the adsorption of IBU exhibited an indirect relationship with an increase in feed water pH.

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Luna-Triguero, A., P. Gómez-Álvarez, and S. Calero. "Adsorptive process design for the separation of hexane isomers using zeolites." Physical Chemistry Chemical Physics 19, no. 7 (2017): 5037–42. http://dx.doi.org/10.1039/c6cp08025a.

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Ren, Guang Jun, and Xiao Peng Wan. "Adsorption of Alizarin Red from Aqueous Solution by Modified Furfural Residue." Advanced Materials Research 826 (November 2013): 163–66. http://dx.doi.org/10.4028/www.scientific.net/amr.826.163.

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An adsorbent was synthesized from modified furfural residue. The properties, kinetics and thermodynamics of alizarin red from water adsorption process on modified furfural residue were studied. The adsorption isotherm indicat that the relationship between adsorbing capacity (qe) and equilibrium mass concentration (Ce) is in accordanced with the isothermal adsorption equations of Langmuir. sorption process of modified furfural residue for alizarin red was decalescence reactionphysical adsorption. alizarin red as an adsorptive material was an effectual method. alizarin red as an adsorptive material was an effectual method. The exploitation and utilization of this furfural residue must bring obvious economic and social benefit to us

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Almeida, Renata M. R. G., Marlei Barboza, and Carlos O. Hokka. "Continuous Clavulanic Acid Adsorption Process." Applied Biochemistry and Biotechnology 108, no. 1-3 (2003): 867–80. http://dx.doi.org/10.1385/abab:108:1-3:867.

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9

Ariyanti, Dessy, Satriani Mo’ungatonga, and Wei Gao. "Enhanced adsorption property of TiO2 based nanoribbons produced by alkaline hydrothermal process." METANA 16, no. 2 (November 22, 2020): 61–67. http://dx.doi.org/10.14710/metana.v16i2.33428.

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TiO2 is a semiconductor material with endless potential for the development of renewable energy as well as in the environmental field application. With various methods, TiO2 nanostructures with various morphology, properties and application can be developed. In this paper, the synthesis of TiO2 based nanoribbons with high adsorption property produced by alkaline hydrothermal methods were investigated. Its morphology, crystal structure and physical properties were characterized using Scanning Electron Microscope (SEM), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) and Brunauer-Emmett-Teller (BET) surface area analysis. The result shows that by controlling the hydrothermal processing time, different morphology and structures of TiO2 nanoribbons with different adsorption properties can be obtained. The nanoribbons produced via alkaline hydrothermal method has width 200-300 nm and length up to several microns. It also possesses fair adsorption capacity over dyes (Rhodamine B and Methyl orange) considering its large surface area and high pore volume.

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10

San-Pedro, Liliana, Roger Méndez-Novelo, Emanuel Hernández-Núñez, Manuel Flota-Bañuelos, Jorge Medina, and Germán Giacomán-Vallejos. "Selection of the Activated Carbon Type for the Treatment of Landfill Leachate by Fenton-Adsorption Process." Molecules 25, no. 13 (July 2, 2020): 3023. http://dx.doi.org/10.3390/molecules25133023.

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Sanitary landfill leachates usually have characteristics that depend on the region where they are generated and according to the age of the landfill, which is why a unique treatment for their sanitation has not been found. However, the adsorption preceded by the Fenton process has been proven to be highly efficient at removing contaminants. In this study, the adsorptive capacity of two types of activated carbon, granular and powdered, was analyzed to determine which was more efficient in the adsorption stage in the Fenton-adsorption process. Likewise, its behavior was analyzed using three isotherm models (Langmuir, Freundlich and Temkin), testing the raw leachate and the Fenton-treated one with both carbons. The adsorption that is carried out on the carbons is better adjusted to the Freundlich and Temkin models. It concludes that multilayers, through the physical adsorption, carry out the adsorption of pollutants on the surface of the carbons. The results show that, statistically, granular activated carbon is more efficient at removing chemical oxygen demand (COD), and powdered activated carbon removes color better. Finally, an adsorption column was designed for the Fenton-adsorption process that was able to remove 21.68 kgCOD/kg carbon. Removal efficiencies for color and COD were >99%.

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Haas, Aline, and Eliane Pereira dos Santos. "Characterization and application of orange peel as an adsorbent for cationic dye removal from aqueous solution." Revista Eletrônica em Gestão, Educação e Tecnologia Ambiental 25 (May 6, 2021): e16. http://dx.doi.org/10.5902/2236117065271.

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With the great generation of colored effluents, several methods for the removal of the color are used, being one of them the method of adsorption in solid medium. In this paper, the in natura orange peel was used as the alternative biomass for the adsorption process of methylene blue, which was characterized by moisture content, pH, apparent density, iodine number, and methylene blue index. To determine the adsorptive capacity of the methylene blue dye, pH 7 was obtained as favorable, the adsorption process showed an adsorption of 82% of the methylene blue dye and a 10 min equilibrium time, where the Freundlich isotherm presented a better adaptation to the adsorption process in orange peel, with its maximum adsorption capacity of 3.9630 mg g-1, for the methylene blue dye.

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Zhai, Qing-Zhou. "Studies of adsorption of crystal violet from aqueous solution by nano mesocellular foam silica: process equilibrium, kinetic, isotherm, and thermodynamic studies." Water Science and Technology 81, no. 10 (May 15, 2020): 2092–108. http://dx.doi.org/10.2166/wst.2020.267.

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Abstract Mesocellular foam (MCF) silica molecular sieve material was successfully synthesized using a hydrothermal method. X-ray diffraction, infrared spectroscopy, low nitrogen adsorption–desorption, scanning electron microscopy, and transmission electron microscopy (TEM) characterization techniques were used to characterize the material. Low temperature nitrogen adsorption–desorption method showed that pore size of the synthesized MCF was 12 nm. TEM study showed that the synthesized MCFs had honeycomb structure pores, which can be good for the absorbance of dye organic macromolecule substances. This work studied the adsorption of crystal violet by MCF and the results showed that when the adsorptive conditions were pH = 9.0, MCF:crystal violet = 150:1, and when the contact time was 10 min at room temperature of 25 ± 1 °C, the adsorption rate reached 99.71% and adsorption capacity was 6.646 mg/g. This study found that the adsorption is a Freundlich type, it is a multimolecular layer adsorption, and it belongs to the pseudo-second-order kinetic model. According to the ΔG0 obtained from adsorption thermodynamics, when the temperature is 25–40 °C, the adsorption enthalpy change ΔH0 = −25.65 kJ/mol, ΔG0 < 0, the adsorption is an exothermic reaction and can spontaneously occur. The adsorption entropy change ΔS0 = 5.54 J/(mol·K) and the entropy of system increased.

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13

Gao, Hai Ying, Xiao Qian Li, Hui Jie Yan, and Xiao Wei Wang. "Simultaneous Adsorption of Trichloroethylene and Cadmium on Attapulgite in the Groundwater." Advanced Materials Research 610-613 (December 2012): 3202–5. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.3202.

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The adsorption of trichloroethylene (TCE) and Cd2+ combined contamination in the groundwater by attapulgite were studied, and the effects of pH, dosage of attapulgite and adsorption time on adsorption were investigated, equilibrium of the adsorptions processes were further conducted. Results showed that the adsorption rate of TCE affected little by the pH; TCE adsorption equilibrium reached after 3d, the removal rate was 71.34%; when attapulgite dosage was 0.03g, the adsorption rate was up to more than 51.08%. Freundlich isotherm was best fitted the adsorption process of TCE. Compound contamination of TCE and Cd2+ decreased the removal rate of TCE; but was in line with Freundlich adsorption isotherm.

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14

Ilaboya, I. R., and J. S. Okpoko. "Thermodynamic Studies on the Sorption of Lead (II), Chromium (III) and Manganese (II) ions onto Acid-Activated Shale." International Journal of Emerging Scientific Research 2 (June 27, 2021): 10–18. http://dx.doi.org/10.37121/ijesr.vol2.158.

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Shale mineral in its raw form was collected, processed, calcinated and activated using tetraoxosulphate (VI) acid. The microstructural arrangement and chemical composition of the raw, calcinated and acid-activated shale was determined using x-ray fluorescence and scanning electron microscope to verify its ability for the removal of Pb2+, Cr3+ and Mn2+ from wastewater. Batch experimental method was used to study the effect of different adsorption parameters on the sorption efficiency of shale. The effect of temperature on the sorption of Pb2+, Cr3+ and Mn2+ on acid-activated shale was investigated at varied temperature of 15 – 40 . The calculated value of enthalpy () was 12.50 kJ/mol for Pb2+ adsorption, 5 kJ/mol for Cr3+ and 11 kJ/mol for Mn2+ adsorption. The calculated values of Gibbs free energy () varies from -6.576 kJ/mol to 1.358 kJ/mol for Pb2+ adsorptions, from -2.696 kJ/mol to 0.192 kJ/mol for Cr3+ adsorptions, and -4.994 kJ/mol to 1.870 kJ/mol for Mn2+ adsorptions. The entropy () range is 38.68 – 60.946 kJ/mol for Pb2+ adsorptions, 16.69 – 24.58 kJ/mol for Cr3+ adsorptions, and 31.70 – 51.10 kJ/mol for Mn2+ adsorptions. The positive value of shows that the adsorption of Pb2+, Cr3+ and Mn2+ onto acid-activated shale was an endothermic process. The values of are negative at temperature of 298 K and above for the three metal ions studied, which confirmed that the adsorption of Pb2+, Cr3+ and Mn2+ on acid-activated shale was a spontaneous process. The decline in with increasing adsorption temperature showed that adsorptions of Pb2+, Cr3+ and Mn2+ onto acid-activated shale became better at higher temperature while the positive value of for all metal ions studied showed the amplified arbitrariness at the solid-solution interface during the fixation of the adsorbate on the active site of acid-activated shale.

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15

Yang, Yue Hong, Dun Tao Shu, Ting Dong Fu, and Huai Yu Zhang. "Equilibrium and Kinetics Studies for Adsorption of Cu(II) from Aqueous Solution by Modified Phosphogypusum." Advanced Materials Research 518-523 (May 2012): 369–75. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.369.

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The purpose of this study was to investigate the adsorption of Cu(II) on phosphogypsum, a waste material from the manufacture of phosphoric acid by wet process. The removal capacity of phosphogypsum for Cu(II) ions was studied as a function of solution pH, contact time, adsorbent dosage and adsorbate concentration. Before batch adsorption study, phosphogypsum was pre-conditioned by calcine without water. The Langmuir and Freundlich theories were used to describe the Cu(II) adsorption process, and the Freundlich isotherm showed the best fit to the process. The adsorptions of Cu(II) followed pseudo-second-order kinetics. Maximum adsorption capacity of lime-preconditioned phosphogypsum was found to be 2.824 mg/g. The results showed that the phoshogypsum is a suitable adsorbent for the removal of Cu(II) ions from aqueous solutions.

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Tang, Yu Bin, Fang Yu, Fang Yan Chen, and Cheng Chen. "Research on Adsorption of Pb²⁺ on to Microspheres Prepared by Rectorite and Humic Acid." Advanced Materials Research 233-235 (May 2011): 1972–80. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.1972.

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Rectorite (REC), humic acid (HA) and polyvinyl alcohol (PVA) were used to prepare microspheres. Batch adsorption experiments of Pb2+ion on to the microspheres were performed. The results obtained indicate that adsorption time, the microspheres dosage and temperature were the main factors influencing the adsorptive capacities. The adsorption data for Pb2+ion were well described by the Freundlich, Langmuir and Temkin models. The kinetic experimental data properly correlated with the pseudo-first-order model, pseudo-second-order model and Elovich equation. The adsorption process is spontaneous, endothermic and out-of-order. The whole adsorption process is mainly controlled by entropies. The adsorption can be classified as chemical adsorption. The mechanisms for the adsorption of Pb2+ion on to the microspheres involved ion-exchange adsorption of Pb2+or the formation of complex compound. Under the experimental conditions employed, the removal of Pb2+ion attained value of 96.05%.

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Takahashi, Chika, Yutaka Ishimaru, Ikuho Iida, and Yuzo Furuta. "The creep of wood destabilized by change in moisture content. Part 2: The creep behaviors of wood during and immediately after adsorption." Holzforschung 59, no. 1 (January 1, 2005): 46–53. http://dx.doi.org/10.1515/hf.2005.008.

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Abstract The fluidity of wood remarkably increases during moisture changes. This phenomenon is termed mechano-sorptive creep. The mechanism of mechano-sorptive creep has been studied, including a previous report by our group. Here, creep tests in bending were carried out for wood during and immediately after adsorption of moisture and after a long moisture conditioning. The effects of the rate of moisture adsorption on creep were also examined. The results and conclusions are as follows: (I) Greater creep occurred immediately after the adsorption process as compared with that after a long moisture conditioning, whereas much greater creep occurred during the same adsorption process, similar to the case of drying. Therefore, during the changes in moisture, not only destabilization but also stabilization should occur simultaneously, so that the wood during the changing process is in a remarkably unstable state. (II) Smaller creep occurred immediately after a slower adsorption as compared with that immediately after a more rapid adsorption. This suggests that wood is more stabilized during a slower versus a more rapid adsorption process. However, difference in creep between the final stages of the slower and the more rapid adsorption process was scarcely found. This is considered to result from the difference in degree of stabilization caused by the different duration of both adsorptions. In other words, this result is only an outward appearance. (III) Greater creeps were recognized during larger changes in moisture content (Δu) during the adsorption processes corresponding to the drying process. Therefore, mechano-sorptive creep depends not only on Δu but also on the range of relative humidity (RH). Larger stabilization was found during the changing process of larger Δu.

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Rodriguez, Miguel A., Abdelah Addaou, Ali Laajeb, Ahmed Lahsini, and Jilali Bentama. "Study of the combining adsorption-microfiltration process for the treatment of coloured waters." Boletín de la Sociedad Española de Cerámica y Vidrio 51, no. 3 (June 30, 2012): 165–68. http://dx.doi.org/10.3989/cyv.242012.

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Bellmann, Cornelia, and Anja Caspari. "Adsorption Processes at Solid Surfaces-Studied by Electrokinetic Investigations." Key Engineering Materials 314 (July 2006): 19–24. http://dx.doi.org/10.4028/www.scientific.net/kem.314.19.

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The process of electrophoretic deposition depends strongly on the electrokinetic properties and with it the surface properties of the material that will be processed. Different additives, conditioners but also the suspending liquid influence the surface of the applied material by adsorption. Electrokinetic investigations reflect changes in properties at the outermost solid surface very sensitive. Streaming potential measurements are especially suited for studying such changes of surface chemistry at solids with different shapes. Two approaches are applicable: 1. The adsorption process was done before measuring. The result of this process should be shown. In this case it will be interesting to see differences in the functionality of the solid surface. The zeta potential will be measured versus different pH value. 2. The adsorption process will be studied directly. The zeta potential will be determined versus the concentration of the adsorptive. The second approach can be used for investigation of adsorption of multicomponent mixtures. Competing adsorption processes are detectable.

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20

Gardner, J. G. "Selective Adsorption in the Process Industries." Gas Separation & Purification 3, no. 1 (March 1989): 46. http://dx.doi.org/10.1016/0950-4214(89)80019-2.

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21

RIBEIRO LIMA, LENILDE MÉRGIA, JOANNY LAYS BANDEIRA CRUZ DA SILVA, LAEDSON ENEAS CAVALCANTE, EDGLEIGA DAISE ALVES FEITOZA, and LÍGIA MARIA RIBEIRO LIMA. "EVALUATION OF ADSORTIVE POWER OF CACTUS PEAR FORAGE WITHOUT PEEL FOR USE IN REMOVAL OF COMMON GASOLINE IN WATER BODIES." Journal of Engineering and Exact Sciences 5, no. 1 (March 8, 2019): 0026–32. http://dx.doi.org/10.18540/jcecvl5iss1pp0026-0032.

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Alternative methods, as adsorption, with use of readily available and low cost materials have been used to remove contaminants in water bodies. Objective of this work was to study adsorptive power of cactus pear forage (Opuntia tuna Mill) biomass without bark as adsorbent for removal of gasoline in water bodies. Material underwent a natural drying process and then comminution to powder form. In adsorption kinetics study, were evaluated time between 5 and 60 minutes (with a 5-minute interval) and equilibrium concentrations of contaminants ranging from 5 to 50%, with a 5% variation rate. It was observed that process was rapid, with greater adsorption efficiency over time for 30 minutes. Langmuir model fitted well to experimental data, with a maximum adsorption capacity of 5.94 g.g -1. Results confirm that cactus pear forage without peel appears as a promising biomass in gasoline adsorption process.

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Xie, Baoshan, Yi Hou, and Youming Li. "Modified lignin nanosphere adsorbent for lead and copper ions." BioResources 16, no. 1 (November 13, 2020): 249–62. http://dx.doi.org/10.15376/biores.16.1.249-262.

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Heavy metal ions in wastewater have negative effects on humans and the environment. In this paper, the adsorption of lead and copper ions by modified eucalyptus lignin nanosphere (ECLNPs) was studied. The spherical alkali-lignin particles had a diameter of 50 nm, abundant carboxyl groups of 0.66 mmol/g, and relatively high adsorption performance. The equilibrium adsorption capacities of Pb(II) and Cu(II) by ECLNPs were 126.0 mg/g and 54.4 mg/g, respectively. Both Pb(II) and Cu(II) adsorptive processes fitted a pseudo-second-order kinetics model. In the simultaneous adsorption process of Pb(II) and Cu(II), ECLNPs had higher adsorptive selectivity for Pb(II) than Cu(II), and there was a competitive adsorption process between Pb(II) and Cu(II). This resulted from the lower hydration heat of Pb(II) in water, which leads to easier separation from water ligands. ECLNPs also showed good recyclability, with 16.6% and 21.1% loss in Pb(II) and Cu(II) adsorption capacity, respectively, after three consecutive adsorption-desorption cycles, which provides a feasible technical direction for the utilization of biomass resources and the treatment of water contamination.

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Choi, Hee-Jeong. "Assessment of sulfonation in lignocellulosic derived material for adsorption of methylene blue." Environmental Engineering Research 27, no. 3 (May 13, 2021): 210034–0. http://dx.doi.org/10.4491/eer.2021.034.

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The lignocellulosic derived cornstalk was sulfonated (SCS) to prepare an adsorbent, and cationic dye methylene blue (MB) was adsorbed using SCS to evaluate its usability. Sulfonation improved the number of carboxyl groups (-COOH) and increased the porosity and surface area of carbon. In the adsorption process in which MB is adsorbed using SCS in aqueous solution, the sulfone group expanded the form of the sulfonated adsorbent to increase the exposure of anions (sulfonic-acid (R-SO3H), carboxylic groups, and bonded OH-group) to the surface. As a result, the adsorption efficiency of MB, a cationic dye for SCS, was improved. The results of kinetics, adsorption isotherm and thermodynamics were suitable for Pseudo-2nd-order and Langmuir, and the adsorption process was endothermic and spontaneous physical adsorption. The maximal adsorptions capacity with Langmuir model was found to be 504.3 mg/g at 293K. Sulfonation improved not only electrostatic interaction but also π-π stacking in the adsorption process, which was very advantageous in adsorbing cationic dyes using lignocellulose-based adsorbents.

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Peng, Zhigao, Shenggui Liu, Songlei Tang, Yuechao Zhao, and Yingjun Li. "Multicomponent Lattice Boltzmann Simulations of Gas Transport in a Coal Reservoir with Dynamic Adsorption." Geofluids 2018 (July 12, 2018): 1–13. http://dx.doi.org/10.1155/2018/5169010.

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Gas adsorption occurs when the dynamic adsorption equilibrium conditions of the local adsorptive sites are broken. In the overall process of unconventional natural gas generation, enrichment, storage, and production, this phenomenon plays a significant role. A double-distribution Lattice Boltzmann model for solving the coupled generalized Navier-Stokes equation and advection-diffusion equation with respect to the gas-solid dynamic adsorption process is proposed for multicomponent gas migration in the unconventional reservoir. The effective diffusion coefficient is introduced to the model of gas transport in the porous media. The Langmuir adsorption rate equation is employed to control the adsorption kinetic process of gas-solid adsorption/desorption. The model is validated in two steps through fluid flow without and with gas diffusion-adsorption between two parallel plates filled with porous media, respectively. Simulation results indicate that with other parameters being equal, the rate of gas diffusion in the porous material and the area of the dynamic adsorption equilibrium-associated region increase with the matrix porosity/permeability. Similar results will happen with a greater saturation adsorption amount or a lower Langmuir pressure. The geometric effect on adsorption is also studied, and it is found that a higher specific surface area or free flow region can enhance the gas transport and the rate of adsorption.

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Vigdorowitsch, Michael, Alexander Pchelintsev, Liudmila Tsygankova, and Elena Tanygina. "Freundlich Isotherm: An Adsorption Model Complete Framework." Applied Sciences 11, no. 17 (August 31, 2021): 8078. http://dx.doi.org/10.3390/app11178078.

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The absolute majority of modern studies dealing with the interpretation of experimental data on the basis of the Freundlich isotherm ignore the fact that the data obtained for regions of low and moderate adsorbate concentration/pressure can be analytically continued within the Freundlich adsorption model to the adsorptive saturation area with coverages tending to 100%. Needless to say, this would give valuable extended information about the corresponding adsorption process. This message proposes a framework to comprehensively analyse experimental data first recognised as complying with the Freundlich adsorption model. An algorithm-driven method is presented which enables one to translate the data obtained in the area of small and moderate the coverages of the area of adsorptive saturation regime. As examples, three sets of experimental data for adsorption of mercury (II) on N-rich porous organic polymers and of protein on carrier nano-Mg(OH)2 have been processed and presented according to the framework developed.

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Ribeiro Alves, Márcia Regina, Abraham Damian Giraldo Zuñiga, Rita de Cássia Superbi Sousa, and Carmelita Zacchi Scolforo. "The Process of Separating Bovine Serum Albumin Using Hydroxyapatite and Active Babassu Coal (Orbignya martiana)." Scientific World Journal 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/2808241.

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Bovine serum albumin is one of the major serum proteins; it plays an important role as a result of its functional and nutritional properties which have bioactive peptides. Adsorption method was used to separate protein, which involves hydroxyapatite, synthetic hydroxyapatite, and active babassu coal. Initially, characterization was carried out using the zeta potential of the adsorbents. Kinetic pseudo-first- and pseudo-second-order models were applied. For isotherms, equilibrium data studies were carried out using the Langmuir and Freundlich models, in addition to determining the efficiency of adsorptive process. The results of the zeta potential showed loads ranging from +6.9 to −42.8 mV. The kinetic data were better represented in the pseudo-second-order model with chemisorption characteristics. The adsorption capacity of the adsorbents decreased as pH increased, indicating that the electrostatic bonds and some functional groups of active babassu coal contributed to the reduction of adsorption, especially oxygen linked to carbon atoms. The value of pH 4.0 showed the best results of adsorption, being obtained as the maximum adsorption capacity (qm) and yield (%) (whereqm=87.95 mg g−1and 74.2%; 68.26 mg g−1and 68.6%; and 36.18 mg g−1, 37.4%) of hydroxyapatite, synthetic hydroxyapatite, and active babassu coal, respectively.

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Parimalam, R., V. Raj, and P. Sivakumar. "Removal of Acid Green 25 from Aqueous Solution by Adsorption." E-Journal of Chemistry 9, no. 4 (2012): 1683–98. http://dx.doi.org/10.1155/2012/197235.

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The adsorptive removal of Acid Green 25 byAnanas Comosus(L) Activated carbon was investigated in this study. The effects of initial dye concentration, contact time, pH and temperature were studied for the adsorption of Acid Green 25 in batch mode. At 100 mg/L of initial dye concentration the adsorbent removes 182.6 mg/g of dye from solution; it further increases on increasing the temperature. The calculated values of ∆G° indicate that the adsorption process is spontaneous, negative ∆H° indicate that the adsorption process is exothermic and the positive value of ∆S° indicates the increase in randomness. The rate of dye adsorption follows pseudo second order model with an r2value of 0. 999. Standard adsorption isotherms were used to fit the experimental equilibrium data. The Langmuir, Freundlich, and Tempkin models are appropriate to explain the adsorption phenomenon with good fit.

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Guo, Tiecheng, Sicong Yao, Hengli Chen, Xin Yu, Meicheng Wang, and Yao Chen. "Characteristics and adsorption study of the activated carbon derived from municipal sewage sludge." Water Science and Technology 76, no. 7 (June 13, 2017): 1697–705. http://dx.doi.org/10.2166/wst.2017.352.

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Sewage sludge-based activated carbon is proved to be an efficient and low-cost adsorbent in treatment of various industrial wastewaters. The produced carbon had a well-developed pore structure and relatively low Brunauer–Emmett–Teller (BET) surface area. Adsorptive capacity of typical pollutants, i.e. copper Cu(II) and methylene blue (MB) on the carbon was studied. Adsorptions were affected by the initial solution pH, contact time and adsorbent dose. Results showed that adsorption of Cu(II) and MB on the produced carbon could reach equilibrium after 240 min. The average removal rate for Cu(II) on the carbon was high, up to 97% in weak acidic conditions (pH = 4–6) and around 98% for MB in a very wide pH range (pH = 2–12). The adsorption kinetics were well fitted by the pseudo-second order model, and both Langmuir and Freundlich isotherm models could well describe the adsorption process at room temperature. The theoretical maximum adsorption capacities of Cu(II) and MB on sewage sludge-based activated carbon were 114.94 mg/g and 125 mg/g, respectively. Compared with commercial carbon, the sewage sludge-based carbon was more suitable for heavy metal ions’ removal than dyes’.

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Mishra, Shuddhodan P., and Tej Bahadur Singh. "Radiotracer technique in adsorption study, part II. Adsorption of phosphate ions on chromium metal powder." Collection of Czechoslovak Chemical Communications 52, no. 4 (1987): 960–69. http://dx.doi.org/10.1135/cccc19870960.

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The adsorption of phosphate ions on chromium metal powder from aqueous solutions of sodium dihydrogen phosphate labelled with 32P has been studied as a function of concentrative (10-3 to 10-6 mol l-1), temperature (303-323 K), and pH (3.5-10.6) of the adsorptive solution. The time for the equilibrium establishment was found to be about 4 hours and it is dependent on the solution acidity. The smooth and continuous growth of phosphate adsorption follows the first order kinetics and the rate constants are found to be of the order of 10-3 min-1. The results show that the adsorption in the system under study obeys the Freundlich isotherm. The increase in temperature from 303 K to 323 K does not effect the process markedly. The adsorption kinetics of phosphate ions is highly dependent on pH of the adsorptive solution. On the basis of the present data the nature and mechanism of the adsorption are discussed.

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Liu, Xiang Jun, and Dan Li Wang. "Modeling of Gas Adsorption Process of a Single Pellet." Advanced Materials Research 374-377 (October 2011): 1201–6. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.1201.

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A commercial zeolite pellet is formed by binding large numbers of small crystals with microporous material. Its Micro-structure has great affects on the gas adsorption process. In this paper, the physical and mathematic models of the adsorption process for a single pellet are established. The N2 adsorption properties in a 5A zeolite pellet are studied. Very detailed results of intra-pellet adsorption process are obtained. The impacts of crystal size, pellet porosity, diffusion coefficient of the binding materials and crystals on the adsorption rate are studied.

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Nacke, Herbert, Affonso Celso Gonçalves, Marcelo Angelo Campagnolo, Gustavo Ferreira Coelho, Daniel Schwantes, Marcelo Gonçalves dos Santos, Dionir Luiz Briesch, and Juliano Zimmermann. "Adsorption of Cu (II) and Zn (II) from Water by Jatropha curcas L. as Biosorbent." Open Chemistry 14, no. 1 (January 1, 2016): 103–17. http://dx.doi.org/10.1515/chem-2016-0010.

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AbstractThe objective of this work was to evaluate the removal of Cu2+ and Zn2+ in water by means of the adsorption process using three biosorbents derived from jatropha biomass (bark, endosperm and endosperm + seed coat). The experiments were performed in batch and evaluated the effect of solution pH, adsorbent mass, contact time, different initial concentrations of the metals Cu2+ and Zn2+, and the temperature of the solution during the adsorptive process. By kinetics, the adsorption isotherms and thermodynamics the mechanisms that control the adsorptive process were evaluated. The optimal conditions for the realization of the adsorptive process for both metals were: solution pH of 5.0 and 8 g L-1 of adsorbent mass per volume of solution, with a contact time between adsorbent and adsorbate of 60 min. According to the Langmuir model, the maximum adsorption capacities for the bark, endosperm and endosperm + seed coat of Jatropha were, respectively, for Cu2+ 11.541, 20.475 and 22.910 mg g-1, and for Zn2+ 14.852; 15.888 and 14.674 mg g-1, with the predominance of chemisorption in monolayer. The three biosorbents derived from the biomass of Jatropha have potential for the remediation of water contaminated with Cu2+ and Zn2+.

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Yang, Tao, Xuansheng Hu, Peijuan Zhang, Xiaogang Chen, Weiwei Wang, Yanping Wang, Qiuxia Liang, Yingjiu Zhang, and Qunce Huang. "Study of pre-treatment of quinoline in aqueous solution using activated carbon made from low-cost agricultural waste (walnut shells) modified with ammonium persulfate." Water Science and Technology 79, no. 11 (June 1, 2019): 2086–94. http://dx.doi.org/10.2166/wst.2019.206.

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Abstract Activated carbon made from agricultural waste (walnut shells) was investigated as a suitable adsorbent for effectively removing quinoline from industrial wastewater. The activated carbon was treated with phosphoric acid and oxidized by ammonium persulfate and its ability to adsorb pyridine and quinoline in aqueous solution was investigated. Kinetic parameters for the adsorption process were determined through pseudo-first-order and pseudo-second-order kinetic models and intraparticle diffusion models. Equilibrium experiments and adsorption isotherms were analyzed using Langmuir and Freundlich adsorption isotherms. After reaching equilibrium, the activated carbon adsorbed quinoline in preference to pyridine: the equilibrium adsorptions from individual aqueous solutions (200 μL L−1) of quinoline and pyridine were 166.907 mg g−1 and 72.165 mg g−1, respectively. Thermodynamic studies of quinoline adsorption were conducted at different temperatures and indicated that quinoline adsorption was an endothermic and spontaneous process. The column-adsorption of quinoline and pyridine was consistent with the Thomas model and the Yoon-Nelson model. The removal efficiency of quinoline reached more than 97% for a velocity of 6 mL min−1 at the initial adsorption stage.

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Lu, Hui Xia, Shao Feng Bu, and Zhong Ping Wang. "Removal of Sulfur from MTBE by Pervaporation Process." Applied Mechanics and Materials 521 (February 2014): 617–20. http://dx.doi.org/10.4028/www.scientific.net/amm.521.617.

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With fog and haze increasingly severe pollution and tighter environmental legislation in China. It is urgent for refinery to reduce sulfur content in MTBE and produce cleaner fuels by deep desulfurization technology. The feasibility of pervaporation (PV) process for removal of sulfur from MTBE was investigated in this study. Adsorption capacities of three different membrane materials such as PDMS, naffion membrane with H and Na forms were compared by immersion tests. PDMS membrane showed better adsorption abilities for MTBE and disulfide. In addition, the adsorption of PDMS membrane in pure MTBE and dimethyldisulfide solution were investigated at 308.15K and 313.15K. It was indicated that increasing operation temperature facilitated to increase the adsorption amount and decrease the time for reaching adsorption equilibration. This research has guiding significance for removal of sulfur from MTBE by PV process.

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Méndez Novelo, Roger Iván, Armín Alejandro May Marrufo, Liliana San Pedro Cedillo, María Neftalí Rojas Valencia, and Germán Giácoman Vallejos. "Leachate Treatment with a combined Fenton/filtration/adsorption processes." Ingeniería Investigación y Tecnología 20, no. 2 (April 1, 2019): 1–9. http://dx.doi.org/10.22201/fi.25940732e.2019.20n2.013.

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Fenton and adsorption are two of the most widely used physicochemical processes for leachates treatment. Each one separately has shown limited treatment capabilities, reaching COD removals up to 60-70%. The Fenton process oxidizes both organic and inorganic matter; nevertheless, low-density sludges are produced and hard to decant. To remove them, the filtration process could be an efficient alternative to eliminate these solids the remaining substances could be removed by means of the adsorption process. This study presents the results of a Fenton/filtration/adsorption treatment train, under the following conditions: a) Fenton: pH = 4, contact time= 60 minutes, [Fe2+]/[H2O2] = 0.6, [COD]/[H2O2] = 9; b) leachate filtered through 4 µm pore filter paper; c) adsorption was performed in a packed column with macroporous granular activated carbon. The COD removals reached 99.9%, where 90.8% was achieved with the Fenton/filtration process and 9.1% was removed by adsorption. The 95.7% of color was removed in the Fenton/filtration stage and 4.3% by adsorption. Although, the COD, BOD5, color and TSS removals from the adsorption process were lower than the Fenton/filtration process, the additional removal allows to the effluent reach the values required to meet the current Mexican Norms

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Rahim, Abdul Rahman Abdul, Iswarya, Khairiraihanna Johari, Nasir Shehzad, Norasikin Saman, and Hanapi Mat. "Conversion of coconut waste into cost effective adsorbent for Cu(II) and Ni(II) removal from aqueous solutions." Environmental Engineering Research 26, no. 4 (September 10, 2020): 200250–0. http://dx.doi.org/10.4491/eer.2020.250.

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Desiccated coconut waste (DCW) is an agricultural waste that originates from the coconut milk processing industry. In this study, it was utilized for the removal of copper (Cu(II)) and nickel (Ni(II)) via adsorption process. The physicochemical characterization of the DCW adsorbent shows that the adsorbent have a surface area of 6.63 m2/g, have high elemental carbon content and existences of important functional groups on its surface. The adsorptive capability of DCW adsorbent in removing the heavy metal were conducted in batch studies. DCW adsorbent performed highest Ni(II) and Cu(II) adsorption capacity at pH 6, where equilibrium is achieved at 450 minutes. The kinetic analysis showed the adsorption agreed with pseudo-second order kinetic model, indicating the Cu(II) and Ni(II) adsorption were a chemical adsorption, limited by the film diffusion. The DCW adsorbent still retained its effective adsorption capacity after 2 adsorption-desorption cycles, which is one of the excellent criteria of a good adsorbent for an adsorption process.

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Son, Heejong, Hoon-Sik Yoom, Chang-Dong Seo, Sang-Goo Kim, and Yong-Soon Kim. "Evaluation of Dissolved Organic Matter Removal Characteristics in GAC Adsorption Process in Drinking Water Treatment Process using LC-OCD-OND." Journal of Korean Society of Environmental Engineers 42, no. 5 (May 31, 2020): 239–50. http://dx.doi.org/10.4491/ksee.2020.42.5.239.

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Objectives:In this study, we used liquid chromatograph-organic carbon detector-organic nitrogen detector (LC-OCD-OND) to evaluate adsorption and breakthrough characteristics of NOM fractions (biopolymers (BP), humic substances (HS), building blocks (BB) and low molecular weight organic substances (LMW-O)) according to the various characteristics of the different materials of granular activated carbons (GACs).Methods:Breakthrough characteristics, adsorption capacity and partition coefficients were evaluated by NOM fractions (BP, HS, BB, and LMW-O) using a lab-scale GAC adsorption column filled with coal-, coconut- and wood-based GAC. The GAC column test was operated with 10 minutes empty bed contact time (EBCT). The pore characteristics of each GAC were evaluated using an automated gas sorption analyzer (Autosorb iQ3, Quantachrome, USA) and the concentrations of NOM fractions in the influent and effluent were analyzed using chromatography LC-OCD-OND (Model 8, DOC-Labor, Germany).Results and Discussion:NOM adsorption capacity was evaluated for different materials of laboratory scale GAC adsorption column test. To study the adsorption behavior of individual NOM fractions according to the operation time, NOM was fractionated into BP, HS, BB and LMW-O by LC-OCD-OND, and the individual NOM fractions were quantified. Higher MW like BP was not adsorbed to GAC, in contrast, HS, BB, and LMW-O were well removed during the initial operation period, the concentrations in the effluent gradually increased as increase the operation period until reaching to the pseudo steady-state. Poor removal of BP in GAC adsorption may be a result of blocking the pores with large MW BP and hinder the access to the pores. However, in the case of HS, BB, and LMW-O, as the molecular size decreased, these organic matters easily access to the pores inside of GAC. It was confirmed through the partition coefficient that the adsorption capacity of these NOM fractions increased in proportion to the MW. In addition, in order to achieve a high NOM removal efficiency in the GAC adsorption process, not only the specific surface area, pore volume, and pore width of the GAC must be large, but also the pHzpc must be higher than the neutral pH level.Conclusions:In order to achieve a high NOM removal efficiency in the GAC adsorption process, not only the specific surface area, pore volume, and pore width of the GAC must be large, but also the pHzpc must be higher than the neutral pH level. In addition, in the NOM fractions, BP were not adsorbed to GAC, while the adsorption capacity of the remaining NOM fractions increased as the MW of the NOM fractions decreased. LMW-O was the most adsorbed, followed by BB, HS and BP. BP and HS play an important role in the membrane fouling that are introduced a lot into domestic and foreign water treatment plants. This study showed that the BP was not removed by the adsorption mechanism of the GAC process. In addition, HS was adsorbed and removed at the beginning of the operation, but the adsorption capacity of HS decreased rapidly as the operation period increased compared to other NOM fractions. Therefore, the GAC adsorption process is not expected to be an effective pre-treatment technology for reducing membrane foulants. Previous studies showed that the yields of DBPs (µmol･DBP/µmol･C) in the high MW humic and low MW non-humic fractions are similar. Therefore, it is suggested that the GAC adsorption process is more effective for DBP precursor control in water containing a larger percentage of LMW NOM.

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Scherle, Marc, and Ulrich Nieken. "Simultaneous Optimization of Process Operational and Material Parameters for a 2-Bed Adsorption Refrigeration Process." ChemEngineering 4, no. 2 (May 6, 2020): 31. http://dx.doi.org/10.3390/chemengineering4020031.

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In process engineering, optimization is usually carried out without the simultaneous consideration of material and process. This issue is addressed in the following contribution. A model-based optimization is presented to improve the performance of adsorption heat pumps. Optimization is carried out in two steps. First, we optimize the operational parameters, the cycle time, and the thickness of the adsorbent for a given adsorption material. In a second step we use a material model to predict heat and mass transfer and adsorption capacity from structural material parameters. This allows us to vary the structural material parameters and calculate the optimal operational parameters for each adsorbent. The two-step optimization thus identifies optimal material properties together with corresponding optimal operational parameters. As constraints, a minimum specific cooling power (SCP) and the passive mass of heat transfer pipes are used. The coefficient of performance (COP) is taken as the objective function. We exemplarily demonstrate the approach for a two-bed adsorption chiller, carbide-derived carbon as the adsorbent, methanol as the sorptive and boron-nitrate as additive to improve heat conductivity. The approach can be easily extended to multi-bed installations and more sophisticated material models.

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Yu, Hai Yan, Bo Gao, Yi Hao, Bo Wang, Guang Zhu Li, and Shi Wen Bi. "Research on Mechanism of Polymer Inhibiting Secondary Reaction in Clinker Leaching Process." Advanced Materials Research 189-193 (February 2011): 1242–47. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.1242.

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In this paper, the mechanism of polymer inhibiting secondary reaction in clinker leaching process was studied by IR spectrum of leaching residue obtained from the reaction of dicalcium silicate with sodium aluminate solution and the adsorption law of polymer AY and PEG on the surface of dicalcium silicate. The results indicated that the main adsorption mode of polymer AY and PEG were chemisorptions and physical adsorption respectively. The mechanism of decreasing the occurrence of secondary reaction is encapsulating surface of dicalcium silicate by AY and PEG. The adsorption mode of polymer AY on dicalcium silicate particles was single molecule adsorption and its adsorption isotherm was the typical “L” type. It accorded with Langmuin equation, and the adsorption free energy EAY was 57.89kJ.mol-1. The adsorption mode of polymer PEG on dicalcium silicate particles was multimolecular adsorption and its adsorption isotherm was the typical “S” type. It accorded with Freundlich equation and the adsorption free energy EPEG was 1.63kJ.mol-1.

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Su, Long, Haibo Zhang, Kokyo Oh, Na Liu, Yuan Luo, Hongyan Cheng, Guosheng Zhang, and Xiaofang He. "Activated biochar derived from spent Auricularia auricula substrate for the efficient adsorption of cationic azo dyes from single and binary adsorptive systems." Water Science and Technology 84, no. 1 (June 10, 2021): 101–21. http://dx.doi.org/10.2166/wst.2021.222.

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Abstract In this study, spent Auricularia auricula substrate (AS)-derived biochar (ASBCs) and activated biochar with NaOH (A-ASBC) were evaluated for the adsorption of cationic azo dyes, including methylene blue (MB), rhodamine B (RB), and crystal violet (CV), from single and binary adsorptive systems. A-ASBC showed a higher maximum adsorption capacity for these dyes (MB: 53.62 mg·g−1, RB: 32.33 mg·g−1, CV: 735.73 mg·g−1) than ASBCs in a single system because it had a greater specific surface area and more oxygen containing-functional groups on the surface. The adsorption process of the three dyes onto the adsorbents was in good agreement with the Freundlich adsorption isotherm and fit the pseudo-second-order kinetic model, which revealed sorbate polymolecular layer formation over the adsorbent surface and the involvement of chemisorption. The adsorption mechanism showed that the adsorption of three dyes on adsorbents could be postulated as a multistep process with extraordinary affinity-induced adsorption in terms of both physisorption and chemisorption. In the binary adsorptive system, the results showed that all MB, RB, and CV had antagonistic/competitive effects on each other's adsorption (QBinary/QSingle < 1). Furthermore, a phytotoxic assay affirmed the effectiveness of the adsorbent in adsorbing dye species from aqueous solutions using Brassica pekinensis L. seeds as the model. Therefore, activated biochar prepared from AS can be used as a potentially economical and effective adsorbent for treating printing and dyeing wastewater.

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Wen, Tao, Yuanyuan Zhao, Youze Xu, Jing Guo, Guangyi Fu, Yingxiang Cheng, and Yu Zhong. "Optimization of process parameters and kinetics of adsorption treatment of thallium-containing wastewater." E3S Web of Conferences 118 (2019): 01025. http://dx.doi.org/10.1051/e3sconf/201911801025.

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Thallium is an extremely toxic metal and abundant in industrial wastewater but little studied. In order to understand the optimal adsorption kinetic parameters of the chelating resin containing hydrazine wastewater, we carried out adsorption experiments on the cerium-containing wastewater treated by chemical precipitation. In this chapter, the optimum adsorption conditions, adsorption model, dynamic adsorption curve and desorption and regeneration of adsorbent were determined at different pH, temperature, adsorption time and different adsorbent dosage. The results show that the removal rate of thallium wastewater by resin is up to 97.5% when the pH value is 9. The optimum adsorption temperature is 30 and the adsorption reached equilibrium at 80 min. The adsorption process is consistent with Lagergren quasi-second-order adsorption and Langmuir isotherm model. The regenerative properties of the resin show that the resin adsorption rates still reach 95.8% after repeat use for six times. In summary, the chelating resin has good adsorption and reusability to the thallium-containing wastewater

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Bayarmaa, B., E. Selenge, and Yang Min. "Study on arsenic removal process from water." Mongolian Journal of Chemistry 12 (September 24, 2014): 53–55. http://dx.doi.org/10.5564/mjc.v12i0.172.

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In this study a novel adsorbent, iron oxide, is used for As (V) or As (III) removal. Some ferric oxides have been reported to be effective for arsenic removal. Ferric oxides powder is a good adsorbent material since it’s has magnetic properties and a good adsorption capacity. The main purpose of this study has been focused on to study the relationship between adsorption capacity (ability, performance) and the surface characteristics of the ferric oxide. Prepared sample’s capacity was evaluated. The value was 26.1-67.4 mg/g for As (V) and 20.5-47.8 mg/g for As (III). pH dependence was evaluated and when pH increasing, adsorption capacity was decreased. The kinetic was evaluated and about 12 hours reached equilibrium and a capacity of 49 mg/g for As (V) and 42 mg/g for As(III) was gained. The kinetic constants for arsenic adsorption on the ferrihydrite adsorbent’s were fitted.DOI: http://dx.doi.org/10.5564/mjc.v12i0.172 Mongolian Journal of Chemistry Vol.12 2011: 53-55

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Kassim Shaari, Norin Zamiah, and Ahmed Qutb Akmal Sajali. "Manganese in the source of groundwater in Malaysia and the method for the removal process: A review on the adsorption and membrane separation processes." Malaysian Journal of Chemical Engineering and Technology (MJCET) 4, no. 1 (May 21, 2021): 1. http://dx.doi.org/10.24191/mjcet.v4i1.12811.

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In Malaysia, the quality of groundwater as one of the main sources drinking water is deteriorated due to the presence of a high level of manganese, which exceeds the allowable values for drinking water consumption. Manganese at concentration higher than 0.1 mg/L causes staining, high turbidity and bad taste problem in drinking water, and eventually can cause a depletion of brain dopamine and a syndrome of motor dysfunction and memory loss resembling Parkinson disease. Several methods have been used to eliminate manganese from the groundwater, which include precipitation, coagulation, ion exchange, oxidation and filtration, aeration, activated carbon adsorption, ionic liquid extraction and biosorption. Among those methods, adsorption is the most efficient and cheaper method to remove heavy metal as the operation is easily be controlled and the reversible adsorbents can be regenerated through a suitable process. Membrane filtration on the other hand particularly reverse osmosis and nanofiltration have been found to be a very effective and economical way to isolate components that are suspended or dissolved in a liquid. In addition to that, the combination of adsorption and membrane filtration process such as polymer enhanced ultrafiltration and adsorptive membrane respectively are currently attracted attentions. This paper provides a review on the adsorption process and membrane filtration process for manganese removal, with subsequently outlining the potential adsorbents to be incorporated in the fabrication of adsorptive membrane.

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Feng, Xianshe, Chuen Y. Pan, John Ivory, and Dave Ghosh. "Integrated membrane/adsorption process for gas separation." Chemical Engineering Science 53, no. 9 (May 1998): 1689–98. http://dx.doi.org/10.1016/s0009-2509(97)00440-5.

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Sakurai, S., and T. Nakayama. "Cl adsorption process on Si( 111 ) surfaces." Surface Science 493, no. 1-3 (November 2001): 143–47. http://dx.doi.org/10.1016/s0039-6028(01)01202-x.

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Sager, Uta, Frank Schmidt, and Klaus Gerhard Schmidt. "The Adsorption Process in Cabin Air Filtration." Chemie Ingenieur Technik 73, no. 6 (June 2001): 735. http://dx.doi.org/10.1002/1522-2640(200106)73:6<735::aid-cite7354444>3.0.co;2-0.

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Chow, D. K. "Optimal process parameters for fixed bed adsorption." Canadian Journal of Chemical Engineering 65, no. 5 (October 1987): 871–76. http://dx.doi.org/10.1002/cjce.5450650523.

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Chang, Yu-Jung, Kwang-Ho Choo, Mark M. Benjamin, and Steve Reiber. "Combined adsorption-UF process increases TOC removal." Journal - American Water Works Association 90, no. 5 (May 1998): 90–102. http://dx.doi.org/10.1002/j.1551-8833.1998.tb08438.x.

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Liu, Tse-Jung, E. E. Chang, and Pen-Chi Chiang. "Adsorption of CECs in the nanofiltration process." Desalination and Water Treatment 54, no. 10 (April 22, 2014): 2658–68. http://dx.doi.org/10.1080/19443994.2014.903868.

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Thakur, R. S., Nitin Kaistha, and D. P. Rao. "Process intensification in duplex pressure swing adsorption." Computers & Chemical Engineering 35, no. 5 (May 2011): 973–83. http://dx.doi.org/10.1016/j.compchemeng.2011.01.024.

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Kawaguchi, Masami. "Sequential polymer adsorption: competition and displacement process." Advances in Colloid and Interface Science 32, no. 1 (June 1990): 1–41. http://dx.doi.org/10.1016/0001-8686(90)80010-w.

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Journal articles on the topic 'Adsorption process'

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