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Journal articles on the topic 'Isotherm method 500'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Nguyen Le My, Linh, and Hieu Bach Thi Kim. "Synthesis of CuO nanosheets via hydrothermal method." Vietnam Journal of Catalysis and Adsorption 11, no. 1 (2021): 73–78. http://dx.doi.org/10.51316/jca.2022.011.

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In this paper, CuO nanosheets were successfully synthesized by a simple hydrothermal method. The synthesized CuO nanosheets were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier Transform Infrared (FTIR), surface area analysis (BET). Several factors influencing the synthesis of material such as concentration of NaOH, hydrothermal temperature and hydrothermal time were studied. Scanning electron microscopy (SEM) investigation reveals that CuO nanosheets have the length of about 500 - 1000 nm. N2 adsorption–desorption isotherm experiment shows that the

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2

Yeo, In Hwan, Kyu Jae Hwang, Jae Hong An, and Jong Ho Lee. "A Study on Heat Transfer Analysis and Experiment of Reinforced Concrete Columns Using 500°C Isotherm Method." Advanced Materials Research 905 (April 2014): 249–53. http://dx.doi.org/10.4028/www.scientific.net/amr.905.249.

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This study aims to assess heat transfer analysis of RC columns and unstressed test by applying 500°C isotherm method, which is the strength deterioration estimation method of Eurocode, inorder to use it as basic data for fire engineering design. According to the heat transfer analysis and fire resistance experiment, it was decided an appropriate axial ratio of RC columns that have cross sections of 300 and 350 can be anticipated as 0.49 and 0.59.

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ARAÚJO, D. L., and G. D. C. PINTO. "Fire behavior of shallow prestressed hollow core slabs from computational modeling." Revista IBRACON de Estruturas e Materiais 13, no. 2 (2020): 398–432. http://dx.doi.org/10.1590/s1983-41952020000200011.

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Abstract Prestressed hollow core slabs are one of the structural systems whose use has increased the most in recent years in Brazil due to its efficiency and versatility. They can be used in many types of structural systems, such as masonry, precast concrete, cast-in-place concrete and steel structures. However, there are few analytical models to evaluate the fire behavior of hollow core slabs. In a simplified way, the fire resistance is evaluated indirectly through the minimum distance of the surface in contact with fire to the reinforcement axis. In this paper, some numerical models in finit

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SUAZNABAR, J. S., and V. P. SILVA. "Combined axial and flexural loads in short reinforced concrete columns in fire: ultimate limit state curves using 500 °C isotherm method." Revista IBRACON de Estruturas e Materiais 11, no. 1 (2018): 163–82. http://dx.doi.org/10.1590/s1983-41952018000100009.

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Abstract Ultimate limit state curves of short reinforced concrete columns in fire situation are going to be presented in this paper. The authors created a code developed in Matlab. It makes a discretization of the cross sections of the columns and calculates the equilibrium integrals of them. The curves were plotted with the code considering the 500 °C isotherm method.

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Maciąg, Michał, and Szymon Spodzieja. "Designing reinforced concrete slabs under fire condition." MATEC Web of Conferences 196 (2018): 02036. http://dx.doi.org/10.1051/matecconf/201819602036.

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In this article the capacity of reinforced concrete slabs of thickness larger than 15 cm was calculated with Isotherm 500 Method. For designed elements were analysed the support and span zone. There have been proposed tables for designers, on which basis it is possible to design slab of demanded fire capacity.

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Aldila, H., A. Indriawati, T. Kusmita, H. Rahmadyani, and D. Y. Dalimunthe. "Study of adsorption isotherms and kinetic models for lead (II) in the mining pit water at Bangka on shrimp waste chitosan." IOP Conference Series: Earth and Environmental Science 1267, no. 1 (2023): 012093. http://dx.doi.org/10.1088/1755-1315/1267/1/012093.

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Abstract The isotherms and kinetic adsorption models for lead (II) in the mining pit water at Bangka on Shrimp Shells Waste Chitosan (Sw-Chi) was studied. The Sw-Chi from the dried shrimp (generally Penaeus semisulcatus species) waste were extracted via deproteinization, demineralization, decolorization and deacetylation steps at previous work. The chitin deacetylation values of Sw-Chi was 88.98% determined through FTIR spectra using baseline method. The initial lead (Pb (II)) concentration in this study was 0.41 ppm from open-pit water in Sungailiat district, Bangka Island. The performance of

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Dinh Du, Pham, Nguyen Trung Hieu, Thuy Chau To, et al. "Aminopropyl Functionalised MCM-41: Synthesis and Application for Adsorption of Pb(II) and Cd(II)." Advances in Materials Science and Engineering 2019 (February 19, 2019): 1–15. http://dx.doi.org/10.1155/2019/8573451.

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This paper shows a comparison of porous properties of aminopropyl-MCM-41 materials functionalised via the direct and indirect methods. The obtained materials were characterised using X-ray powder diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis-differential scanning calorimeter (TGA-DSC), adsorption/desorption isotherms of nitrogen, and Fourier-transfer infrared (FT-IR) spectroscopy. The results showed that the direct method provided the aminopropyl-MCM-41 material with well-ordered pores and high surface areas but with a lower quantity of grafted 3-aminopr

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Xu, Shun Jian, Guan Jun Qiao, Di Chen Li, Hong Jie Wang, and Tian Jian Lu. "Using of Ethylene Glycol as Pore-Form Agent to Form Interconnected Mesopores in Carbonized Phenol Resin." Materials Science Forum 569 (January 2008): 265–68. http://dx.doi.org/10.4028/www.scientific.net/msf.569.265.

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We used ethylene glycol as pore-forming agent to prepare porous carbon with interconnected pores derived from phenol–formaldehyde resin. The mixture of resins and glycol was by polymerization and pyrolysis monolithic material of porous carbon with interconnected mesopores and a narrow pore size range. The average pore size of the porous carbon obtained was 28.2 nm. The nitrogen adsorption isotherm for the porous carbon exhibited type IV isotherm, which corresponded to mesoporous adsorption. The method could endow porous carbon with BET surface area and pore volume about 500 m2/g and 0.607 cm3/

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9

KAYA, HARUN. "A GREEN APPROACH FOR DYE DECONTAMINATION: ACTIVATED CARBON FROM HEMP WASTE." Cellulose Chemistry and Technology 59, no. 3-4 (2025): 441–50. https://doi.org/10.35812/cellulosechemtechnol.2025.59.39.

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In this research, activated carbon was derived from hemp waste using a chemical activation technique, and methylene blue adsorption was tested. Hemp wastes were first carbonized at 500 °C, mixed at a 1:3 biochar/KOH ratio by mass, and activated at 800 °C. The equilibrium data's suitability to the Langmuir, Freundlich, and Harkin-Jura isotherms was investigated, and it was identified as compatible with the Langmuir isotherm. The maximum adsorption capacity (qm) was determined as 400.25 mg/g. Adsorption kinetics were analyzed with intraparticle diffusion, pseudo-first and pseudo-second models, a

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10

Jaszczak, Bogusz, Mieczysław Kuczma, and Wojciech Szymkuć. "Comparison of the load-bearing capacity of reinforced concrete columns under fire conditions using the method A, zone method and isotherm 500 method." Fire Safety Journal 124 (September 2021): 103396. http://dx.doi.org/10.1016/j.firesaf.2021.103396.

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11

Romatschke, Ulrike. "Melting Layer Detection and Observation with the NCAR Airborne W-Band Radar." Remote Sensing 13, no. 9 (2021): 1660. http://dx.doi.org/10.3390/rs13091660.

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A melting layer detection algorithm is developed for the NCAR 94 GHz airborne cloud radar (HIAPER CloudRadar, HCR). The detection method is based on maxima in the linear depolarization ratio and a discontinuity in the radial velocity field. A melting layer field is added to the radar data, which provides detected, interpolated, and estimated altitudes of the melting layer and the altitude of the 0 °C isotherm detected in model temperature data. The icing level is defined as the lowest melting layer, and the cloud data are flagged as either above (cold) or below (warm) the icing level. Analysis

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12

Febri Juita Anggraini, Rara Arsapita, and Yasdi Yasdi. "Efektivitas Karbon Aktif Dari Batu Bara Muda dalam Menurunkan COD pada Air Limbah Industri Tahu." INSOLOGI: Jurnal Sains dan Teknologi 2, no. 2 (2023): 327–39. http://dx.doi.org/10.55123/insologi.v2i2.1822.

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Lignite is the lowest quality coal and cannot be traded in the market. One alternative is that lignite coal has a better use value, lignite coal can be used as a material for making activated carbon. Coal which has become activated carbon can be applied to tofu industrial waste water as an adsorbent in absorbing chemical oxygen demand contained in tofu industrial waste water. The purpose of this study was to determine the characteristics of activated carbon from lignite,opium conditions and isotherm modeling. The method used in the manufacture of activated carbon from lignite is to use an acti

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Lahuri, Azizul Hakim, Mohd Ambar Yarmo, Maratun Najiha Abu Tahari, and Norliza Dzakaria. "Adsorption Isotherm Analysis for CO<sub>2</sub> Capture Using Barium Oxide Impregnated Iron(III) Oxide by Ultrasonic-Assisted Synthesis." Key Engineering Materials 908 (January 28, 2022): 379–84. http://dx.doi.org/10.4028/p-lm9fmx.

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The barium oxide impregnated iron(III) oxide (BaO/Fe2O3) adsorbent was synthesized by an ultrasonic-assisted method. The adsorbent was calcined at 200-500 °C and its adsorption capacity was measured. The ultrasonic-assisted synthesis generated well-dispersed of BaO on Fe2O3 by giving none of the BaO peaks were observed through the XRD pattern. The most efficient adsorbent of BaO/Fe2O3200 was calcined at 200 °C with adsorption capacity for physisorption and chemisorption of 5.01 and 88.81 mg/g respectively. Besides other carbonate species, it was believed the presence of the hydroxyl group coul

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14

Arockiaraj, Mallika, Suyambulingam Kirubavathy, Abdulhameed Al-Hashem, Rajendran Santhammal, R. M. Joany, and Časlav Lačnjevac. "Inhibition of corrosion of mild steel by an alcoholic extract of a seaweed Sargassum muticum." Zastita materijala 62, no. 4 (2021): 304–15. http://dx.doi.org/10.5937/zasmat2104304j.

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An alcoholic extract of a sea weed Sargassum muticum has been used to control corrosion of mild steel in 0.5 N HCl. Weight loss method and Electrochemical studies have been used in this study. Weight loss study reveals that 500 ppm of the inhibitor offers 99.25 % inhibition efficiency. Polarization study reveals that the inhibitor functions as an anodic inhibitor at higher concentration. The AC impedance spectra confirm the formation of a protective film on the metal surface. Adsorption of inhibitor molecules on the metal surface follows Langmuir adsorption isotherm.

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15

Nik Abdul Ghani, Nik Rashida, Mohammed Saedi Jami, and Ku Mariam Zainab Ku Abdullah. "ADSORPTION STUDIES OF GRAPHENE OXIDE FOR LEAD REMOVAL FROM SYNTHETIC WASTEWATER." Chemical and Natural Resources Engineering Journal (Formally known as Biological and Natural Resources Engineering Journal) 2, no. 2 (2019): 21–36. https://doi.org/10.31436/cnrej.v2i2.40.

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Lead contamination present in wastewater is one of the major problems due to its toxicity and persistence. This issue increased dramatically and led to environmental and health concern worldwide. Therefore, this study aims to remove lead from synthetic wastewater effluent by adsorption process. In this study, nanomaterial called graphene oxide is used as an adsorbent due to its mechanical strength and high surface area. The parameters were optimized using Fractional factorial design under response surface method. Graphene oxide demonstrates high adsorption capacity, qmax = 500 mg/g at 100 mg/L

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16

Gentile, Vincenzo, Michele Libralato, Stefano Fantucci, Louena Shtrepi, and Giorgia Autretto. "Super adsorbent bio-polymer additive to improve hygroscopic and acoustic properties of a conventional lime plaster." Journal of Physics: Conference Series 2654, no. 1 (2023): 012074. http://dx.doi.org/10.1088/1742-6596/2654/1/012074.

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Abstract The paper introduces a new lime plaster composition, with a Super Bio-Polymeric Adsorbent (SABP), for interior applications to improve hygrothermal and acoustic comfort. Alginate SABP is added to a conventional lime plaster to improve hygroscopic and acoustic performance. The hygrothermal and acoustic properties of the modified plaster are compared with the ones of the original plaster with a preliminary moisture uptake test, the evaluation of the sorption isotherm, the moisture buffering value (MBV), and the acoustic absorption. The results show a significant increase in the equilibr

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17

Badaruddin, Muhammad, Nur Ahmad, Erni Salasia Fitri, Aldes Lesbani, and Risfidian Mohadi. "Hydrochar and Humic Acid as Template of ZnAl Layered Double Hydroxide for Adsorption of Phenol." Science and Technology Indonesia 7, no. 4 (2022): 492–99. http://dx.doi.org/10.26554/sti.2022.7.4.492-499.

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The adsorbents potential ZnAl-LDH, ZnAl-Hydrochar, and ZnAl-Humic acid were prepared using the coprecipitation method. The adsorbents were characterization by XRD, FTIR, and BET analysis. XRD peaks of ZnAl-LDH at 10.29°, 20.07°, 29.59°, 32.12°, 34.02°, 48.06°, and 60.16°. The FTIR absorption peak was observed at 3400-3500 cm−1, 1600-1700 cm−1, 1381 cm−1, 1000 cm−1, 500-700 cm−1. All adsorbents exhibited N2 adsorption-desorption isotherms type IV classified as a mesoporous structure (pore size= 2-50 nm). The surface areas of composites were higher than LDH and following order: ZnAl-Hydrochar &g

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18

Jara-Cobos, Lourdes, María Eulalia Peñafiel, Carolina Montero, Miguel Menendez, and Veronica Pinos-Vélez. "Ciprofloxacin Removal Using Pillared Clays." Water 15, no. 11 (2023): 2056. http://dx.doi.org/10.3390/w15112056.

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In this work, Ti-pillared bentonites were evaluated to remove ciprofloxacin (CIP) from the aqueous solution. Pillared sodium bentonite (BSP) and pillared calcium bentonite (BCP) were prepared by means of the sol–gel method using titanium tetraisopropoxide with calcination for 3 h at 500 °C. They were characterized using the BET method for N2 adsorption, and subjected to X-ray diffraction and Fourier transform infrared spectroscopy. The results show that the surface area of the pillared bentonites increased after the process, more than the natural ones. Pillared sodium bentonite has a more poro

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19

Pitri Lestari, Nasrul Rofiah Hidayati, and Sri Wahyuningsih. "The Influence of Variation in Dosage and Contact Time of Activated Carbon Adsorbent from Clove Leaf Waste on the Concentration of NH3 in Liquid Waste from Leather Industry." International Journal of Health Literacy and Science 1, no. 2.1 (2023): 1–7. http://dx.doi.org/10.60074/ihelis.v1i2.1.39.

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Hazardous due to containing organic and chemical pollutants, including NH3 waste. Adsorption method is the most effective and economical way in leather industry waste management. This study aims to determine the effectiveness of varying doses and contact times in reducing NH3 levels in leather industry waste. The activated carbon used in this study is obtained from waste clove oil distillation leaves, carbonized at 500 °C for 2 hours, and activated using 0.1 M KOH. For the adsorption process, different doses of activated carbon (0.5; 1; 1.5; 2; 2.5) grams and various contact times (5, 10, 15,

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20

Ali, Md Yousuf, M. A. Alim, and Md Mashud Karim. "Mixed Convective Heat Transfer Analysis by Heatlines on a Lid-Driven Cavity Having Heated Wavy Wall Containing Tilted Square Obstacle." Mathematical Problems in Engineering 2023 (July 26, 2023): 1–17. http://dx.doi.org/10.1155/2023/1374926.

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The current problem studies the mixed convective heat transport by heatlines in lid-driven cavity having wavy heated walls with two diamond-shaped obstacles. The left and right vertical walls are both cold, whereas the top wall is adiabatic, and the bottom wavy wall is heated. The relevant governing equation has been calculated through using the finite element method as well as the Galerkin weighted residual approach. The implications of the Reynolds number 10 ≤ R e ≤ 500 , Richardson number 0.01 ≤ R i ≤ 10 , Hartman number 0 ≤ H a ≤ 100 , Prandtl number 0.015 ≤ P r ≤ 10 , Undulations number 1

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Novakovic, Tatjana, Ljiljana Rozic, Srdjan Petrovic, Zorica Vukovic, and Vera Dondur. "Pore surface fractal analysis of PEG and La(III)-doped mesoporous alumina obtained by the sol-gel method." Journal of the Serbian Chemical Society 75, no. 6 (2010): 833–43. http://dx.doi.org/10.2298/jsc090922053n.

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Active porous alumina was prepared via a sol-gel method and subjected to thermal treatment in the temperature range 500-1200 ?C. The addition of lanthanum effectively inhibited the surface area loss of the aluminas. Fractal analysis from nitrogen adsorption isotherm was used to study the pore surface roughness of alumina samples with different chemical compositions (PEG, PEG and lanthanum) and calcinations conditions in terms of the surface fractal dimension, d. The Mahnke and M?gel (MM) model was used to determine the value of d of La(III)-doped alumina. Following the MM model, the d value of

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Liu, Xu, Huilai Liu, Kangping Cui, et al. "Adsorption-Reduction of Cr(VI) with Magnetic Fe-C-N Composites." Water 15, no. 12 (2023): 2290. http://dx.doi.org/10.3390/w15122290.

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In this study, the iron-based carbon composite (hereafter FCN-x, x = 0, 400, 500, and 600 calcination) was synthesized by a simple high-temperature pyrolysis method using iron-containing sludge coagulant generated from wastewater treatment settling ponds in chemical plants. The FCN-x was used for the adsorptive reduction of aqueous phase Cr(VI) effectively. The FCN-x was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier infrared spectrometer (FT-IR), X-ray photoelectron spectrometer (XPS), and Brunauer-Emmett-Teller theory (BET). FCN-x adsorption of Cr(VI) w

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23

Al-Ansari, Mohammed S., and Muhammad S. Afzal. "Four-Face Heated Uniaxial Reinforced Concrete Columns Interaction Charts." Civil Engineering Journal 9, no. 7 (2023): 1542–60. http://dx.doi.org/10.28991/cej-2023-09-07-01.

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This paper presents an analytical method for generating the interaction diagrams of uniaxially reinforced concrete (RC) columns that are subjected to four-face heating. Twenty-one (21) specimens obtained from previous case studies that were subjected to four-face heating (with different fire test times ranging from 63 to 356 fire minutes) are used to validate the proposed uniaxial interaction charts. The results obtained from the case studies and from the proposed charts are also compared with the finite element software (FIN EC). The 500°C isotherm as well as the zone method are used in the c

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Nawar, Mohamed F., Alaa F. El-Daoushy, Ahmed Ashry, Mohamed A. Soliman, and Andreas Türler. "Evaluating the Sorption Affinity of Low Specific Activity 99Mo on Different Metal Oxide Nanoparticles." Inorganics 10, no. 10 (2022): 154. http://dx.doi.org/10.3390/inorganics10100154.

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99Mo/99mTc generators are mainly produced from 99Mo of high specific activity generated from the fission of 235U. Such a method raises proliferation concerns. Alternative methods suggested the use of low specific activity (LSA) 99Mo to produce 99mTc generators. However, its applicability is limited due to the low adsorptive capacity of conventional adsorbent materials. This study attempts to investigate the effectiveness of some commercial metal oxides nanoparticles as adsorbents for LSA 99Mo. In a batch equilibration system, we studied the influence of solution pH (from 1–8), contact time, in

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Cuccarese, Marco, Sergio Brutti, Angela De Bonis, et al. "Sustainable Adsorbent Material Prepared by Soft Alkaline Activation of Spent Coffee Grounds: Characterisation and Adsorption Mechanism of Methylene Blue from Aqueous Solutions." Sustainability 15, no. 3 (2023): 2454. http://dx.doi.org/10.3390/su15032454.

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Dyes are emerging as hazardous pollutants, which are the primary challenges for environmentalists. Dye removal from effluents is urgently needed. Adsorption technology has been widely employed in this context as an effective method for removing colours from the aqueous phase, and adsorption with the use of low-cost adsorbents has been shown to be more successful on a larger scale than other methods. In this study, spent coffee grounds (SCGs) were used as the precursor for the preparation of a low-cost activated carbon through the chemical activation with NaOH. The SCG sample was impregnated wi

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Zhang, Wenlin, Mingwan Liu, Yuhong Zhao, and Qinhong Liao. "Facile Preparation of Porous Carbon Derived from Pomelo Peel for Efficient Adsorption of Methylene Blue." Molecules 27, no. 10 (2022): 3096. http://dx.doi.org/10.3390/molecules27103096.

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Pomelo peel waste-derived porous carbon (PPPC) was prepared by a facile one-step ZnCl2 activation method. The preparation parameters of PPPC were the mass ratio of ZnCl2 to pomelo peel of 2:1, carbonization temperature of 500 °C, and carbonization time of 1 h. This obtained PPPC possessed abundant macro-,meso-, and micro-porous structures, and a large specific surface area of 939.4 m2 g−1. Surprisingly, it had excellent adsorption ability for methylene blue, including a high adsorption capacity of 602.4 mg g−1 and good reusability. The adsorption isotherm and kinetic fitted with Langmuir and p

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27

Khakbaz, Faeze, Mohamad Mahani, and Mehdi Yoosefian. "Adsorption of diazinon using Cd-MOF nanoparticles before determination by UV-Vis spectrometer: isotherm, kinetic and thermodynamic study." Analytical Methods in Environmental Chemistry Journal 5 (June 29, 2022): 24–38. http://dx.doi.org/10.24200/amecj.v5.i02.175.

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In this work, Cd MOF has been prepared using a hydrothermal method and characterized by the SEM, elemental mapping, XRD, EDS, and BET analysis. The diazinon stability has been investigated in various pH (4-8) and temperature (298oK – 323oK) using UV-Vis spectrometer in the range of 230 – 280 nm, at its main absorption peak at 247 nm. Adsorption behaviors of diazinon on the Cd MOF were considered in different conditions. UV-Vis spectroscopy was used to monitor the removal of diazinon using the Cd MOF. The adsorption capacity of 138 mg g-1 was obtained. The effect of temperature (298 K -323 K),

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Putri, Fami Amalia, Nur Fala Hamadi, Ajeng Y. D. Lestari, Achmad Chafidz, and Tintin Mutiara. "Potential of Modified Corn Cob (Zea mays L.) and Petai Hull (Parkia hassk) as New Biosorbent for Removal of Lead Waste." Key Engineering Materials 783 (October 2018): 126–31. http://dx.doi.org/10.4028/www.scientific.net/kem.783.126.

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Lead metal is one type of heavy metal that has high toxicity levels in the aquatic waste environment. The adsorption method is one of the alternatives in reducing heavy metal waste, by utilizing biosorbent. The purpose of this research is to study the process of making new biosorbent and to know the absorption of new biosorbent from corn cob (Zea mays L.) and petai hull (Parkia hassk) to dissolve lead metal waste (Pb). There are two types of biosorbents are ordinary (simplicia) biosorbents and modified biosorbents with nitric acid (HNO3). Synthetic waste is used in the form of Pb (II) metal io

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Brics, Arvis, Dmitrijs Serdjuks, Marina Gravit, et al. "The Behaviour of Load-Carrying Members from Cordwood." Buildings 12, no. 10 (2022): 1702. http://dx.doi.org/10.3390/buildings12101702.

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With the growing importance of sustainable construction in the world, cordwood is gaining additional interest as a building material for load-bearing structures. The number of studies on cordwood is limited; there is a lack of information on cordwood design methods, including in the case of fire exposure. The design methods for axially compressed load-carrying cordwood members, including in the case of fire action, are described and supplied by the numerical examples. Numerical and laboratory experiments are carried out to clarify the behaviour of cordwood under pressure with different types o

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Hu, Jian-ying, Takako Aizawa, and Yasumoto Magara. "Evaluation of adsorbability of pesticides in water on powdered activated carbon using octanol-water partition coefficient." Water Science and Technology 35, no. 7 (1997): 219–26. http://dx.doi.org/10.2166/wst.1997.0280.

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The 1-octanol-water partition coefficients (logPow) of seven pesticides, i.e., Hymexazol, methomyl, imidacloprid, thiophanatemethyl, carbaryl, linuron, thiobencarb, were determined by RPHPLC method. The relation between these estimated logPow and adsorption isotherm parameters on powdered activated carbon was studied by correlating their logPow values with the Freundlich adsorption parameters. The adsorption parameter, logk, was found to increase with the increase of logPow for the pesticides examined. The activated carbon amount needed for lowering pesticide concentration from 500 μg/l to 50

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Deng, Hua, Qiuyan Li, Meijia Huang, et al. "Removal of Zn(II), Mn(II) and Cu(II) by adsorption onto banana stalk biochar: adsorption process and mechanisms." Water Science and Technology 82, no. 12 (2020): 2962–74. http://dx.doi.org/10.2166/wst.2020.543.

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Abstract Low-cost banana stalk (Musa nana Lour.) biochar was prepared using oxygen-limited pyrolysis (at 500 °C and used), to remove heavy metal ions (including Zn(II), Mn(II) and Cu(II)) from aqueous solution. Adsorption experiments showed that the initial solution pH affected the ability of the biochar to adsorb heavy metal ions in single- and polymetal systems. Compared to Mn(II) and Zn(II), the biochar exhibited highly selective Cu(II) adsorption. The adsorption kinetics of all three metal ions followed the pseudo-second-order kinetic equation. The isotherm data demonstrated the Langmuir m

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Khumnuan, Chutima, Amornrat Moungon, Karine Mougin, and Pornsawan Amornsakchai. "Effect of Preparation Conditions on Heavy Metal Adsorption Characteristics of Activated Carbon Prepared from Non-Fibrous Material of Pineapple Leaves." Key Engineering Materials 824 (October 2019): 114–20. http://dx.doi.org/10.4028/www.scientific.net/kem.824.114.

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Activated carbon can be prepared from any kind of hydrocarbon-based material, and that from agricultural wastes is attractive for many reasons. The use of natural fiber in various industries gives rise to some associated waste streams. In this work, activated carbon, produced from the non-fibrous material waste from pineapple leaf fiber production, was studied for its heavy metal adsorption behavior. The material was carbonized at different temperatures and chemical activation was carried out using phosphoric acid. Pore size and pore volume of the adsorbent were determined using the Brunauer–E

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Ahmed, Muthanna J. "PREPARATION OF ACTIVATED CARBONS FROM DATE STONES BY CHEMICAL ACTIVATION METHOD USING FeCl3 and ZnCl2 as ACTIVATING AGENTS." Journal of Engineering 17, no. 04 (2011): 1007–22. http://dx.doi.org/10.31026/j.eng.2011.04.26.

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Date stones were used as precursor for the preparation of activated carbons by chemicalactivation with ferric chloride and zinc chloride. The effects of operating conditions representedby the activation time, activation temperature, and impregnation ratio on the yield and adsorptioncapacity towards methylene blue (MB) of prepared activated carbon by ferric chloride activation(FAC) and zinc chloride activation (ZAC) were studied. For FAC, an optimum conditions of 1.25h activation time, 700 °C activation temperature, and 1.5 impregnation ratio gave 185.15 mg/gMB uptake and 47.08 % yield, while f

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Pereiz, Zimon, Efriyana Oksal, Chuchita Chuchita, Miranti Maya Sylvani, and Yunus Pebriyanto. "The Potential of Ironwood as an Activated Carbon Adsorbent for Heavy Metal Mercury (Hg) Using the Pyrolysis Method." Jurnal Berkala Ilmiah Sains dan Terapan Kimia 19, no. 1 (2025): 25. https://doi.org/10.20527/jstk.v19i1.20957.

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This study focuses on the utilization of ironwood as an activated carbon adsorbent to remove heavy metal mercury (Hg). The background of the problem includes mercury pollution from various industrial sources and its harmful impacts on the environment and human health. The purpose of this study was to develop an effective method for adsorbing mercury using natural ironwood materials. The research method involves the synthesis of activated carbon through pyrolysis and chemical activation processes, followed by a series of adsorption tests on mercury with variations in pH conditions, contact time

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Songthan, R., V. Somsongkul, and C. Kongmark. "Valorization of rubberwood waste into porous carbon." IOP Conference Series: Materials Science and Engineering 1234, no. 1 (2022): 012031. http://dx.doi.org/10.1088/1757-899x/1234/1/012031.

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Abstract Rubberwood is one of the main Thailand goods exports. In each year, about 45,000 hectares of rubber tree are cut down, only about 30% of them is appropriated for furniture production while most of the rest is used as woodfuel. This research work focuses on the valorization of rubberwood waste into porous carbon and the optimization of carbonization process for the production of hierarchical porous carbon. Rubberwood wastes obtained from a rubberwood processing industry (in Thailand’s southern region) were treated with H3PO4 and subjected to two different carbonization methods. In the

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Hernández-Pichardo, Marcello L., J. A. Montoya, P. Del Angel, and S. P. Paredes. "Phase Stabilization of Mesoporous Mn-Promoted ZrO₂: Influence of the Precursor." Advanced Materials Research 132 (August 2010): 68–75. http://dx.doi.org/10.4028/www.scientific.net/amr.132.68.

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Mesoporous zirconia-Mn oxides were prepared by surfactant-assisted precipitation using different zirconia precursors and cetyl-trimethyl-ammonium bromide (CTAB) as a synthetic template. The objective of this work was to find out the influence of the zirconia precursors over the structural and textural characteristics of Mn-doped mesoporous zirconia solids. A series of syntheses were carried out by two methods using different zirconia precursors, modifying the Zr:surfactant ratio and the hydrolysis rate of the precipitate. After calcination at 500 °C, the samples were characterized by XRD, DTA,

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Akhtar, US, MK Hossain, MS Miran, and MYA Mollah. "Synthesis and characterization of porous silica and polyaniline-porous silica composite materials with high surface area." Bangladesh Journal of Scientific and Industrial Research 49, no. 1 (2014): 1–8. http://dx.doi.org/10.3329/bjsir.v49i1.18847.

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Porous silica materials were synthesized from tetraethyl orthosilicate (TEOS) using Pluronic P123 (non-ionic triblock copolymer, EO20PO70O20) as template under acidic conditions which was then used to prepare polyaniline (PAni) and porous silica composites (PAnisilica) at a fixed molar ratio. These materials were characterized by nitrogen adsorption-desorption isotherm measured by Barrett-Joyner- Halenda (BJH) method and pore size distribution from desorption branch and surface area measured by the Brunauer-Emmett-Teller (BET) method, scanning electron microscopy (SEM), transmission electron m

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Teweldebrihan, Meseret Dawit, and Megersa Olumana Dinka. "Methyl Red Adsorption from Aqueous Solution Using Rumex Abyssinicus-Derived Biochar: Studies of Kinetics and Isotherm." Water 16, no. 16 (2024): 2237. http://dx.doi.org/10.3390/w16162237.

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This work focused on the decolorization of methyl red (MR) from an aqueous solution utilizing Rumex abyssinicus-derived biochar (RAB). RAB was prepared to involve unit operations such as size reduction, drying, and carbonization. The pyrolysis of the precursor material was carried out at a temperature of 500 °C for two hours. After that, the prepared RAB was characterized by the pH point of zero charge (pHpzc), the Brunauer–Emmett–Teller (BET) method, Scanning Electron Microscopy (SEM) and Fourier-Transform Infrared (FTIR) spectroscopy. On the other hand, a batch adsorption experiment of MR re

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Ramli, Anita, Nur Akila Syakida Idayu Khairul Anuar, Nur Aielia Amira Bakhtiar, Normawati Mohamad Yunus, and Alina Rahayu Mohamed. "Direct Oxidation of Hibiscus cannabinus Stalks to Vanillin Using CeO2 Nanostructure Catalysts." Molecules 28, no. 13 (2023): 4963. http://dx.doi.org/10.3390/molecules28134963.

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Biomass lignin can be used to produce vanillin through an oxidation process. Although its purity is high, the processing time and separation efficiency are not ideal. This research aims to produce vanillin directly from Kenaf stalks without separating the lignin first from the lignocellulosic biomass. This method is greener because it does not require the separation of cellulose and hemicellulose from the biomass, thus minimizing the use of acid and alkaline solutions and saving time. A high oxygen storage capacity and release capacity of ceria as an oxidation catalyst contribute to the revers

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Doi, Koichi, Satoshi Hino, Hiroki Miyaoka, Takayuki Ichikawa, and Yoshitsugu Kojima. "Thermodynamic Characterization on Hydrogen Absorption and Desorption Reactions of Lithium – Silicon Alloy." Materials Science Forum 654-656 (June 2010): 2815–18. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.2815.

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Lithium hydride LiH is one of the attractive hydrogen storage materials, because it stores 12.7 mass% of H2. However, H2 desorption reaction occurs over 600 °C due to the large enthalpy change of H2 desorption Ho = 181 kJ/mol H2. The purpose of this work is to control the enthalpy change of LiH to much lower value by a mechanical alloying with Si, where the Li-Si alloy is thermodynamically more stable than Li. The alloy was synthesized from Li granule and Si powder by a mechanical alloying method. The H2 absorption and desorption properties were characterized by High-Pressure Differential Sca

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Michałek, Tomasz, Konrad Wojtaszek, Stanisław Małecki, et al. "Recovery of Pd(II) Ions from Aqueous Solutions Using Activated Carbon Obtained in a Single-Stage Synthesis from Cherry Seeds." C 9, no. 2 (2023): 46. http://dx.doi.org/10.3390/c9020046.

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This paper describes a single-stage synthesis process for activated carbon using cherry seeds. The influences of the carbonization temperature and the time were investigated. Using the BET method, the surface area of the obtained activated carbons was determined, as well as the pore distribution, while SEM images provided further insight into the structure of the surface. Next, the adsorption isotherm was derived. For the test, Pd(II) chloride complex ions were used. It was found that the obtained activated carbon were suitable for palladium(II) recovery from diluted aqueous solutions. Out of

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Zaccheus, Shehu, Wilson Danbature Lamai, and Muhammed Ahmed. "Adsorption of Lead in Aqueous Solution using Montmorillonite-silica Nanocomposite." Pharmaceutical and Chemical Journal 4, no. 5 (2017): 27–34. https://doi.org/10.5281/zenodo.13825565.

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In this study, the locally available materials which include; montmorillonite clay and rice husks were used to synthesize montmorillonite-silica nanocomposite as adsorbent in removal of lead from aqueous solution. Fourier transform infra-red (FTIR), was used to characterize the adsorbent. Batch method of adsorption was employed in the study and parameters that influence the adsorption such as adsorbent dose, initial concentration and contact time have been studied. The optimum conditions of the study were found at the initial concentration 500 mg/L, adsorbent dosage (0.3g), contact time 40 (mi

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Cho, Hae-Chang, Sun-Jin Han, Inwook Heo, Hyun Kang, Won-Hee Kang, and Kang Su Kim. "Heating Temperature Prediction of Concrete Structure Damaged by Fire Using a Bayesian Approach." Sustainability 12, no. 10 (2020): 4225. http://dx.doi.org/10.3390/su12104225.

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A fire that occurs in a reinforced concrete (RC) structure accompanies a heating temperature, and this negatively affects the concrete material properties, such as the compressive strength, the bond between cement paste and aggregate, and the cracking and spalling of concrete. To appropriately measure the reduced structural performance and durability of fire-damaged RC structures, it is important to accurately estimate the heating temperature of the structure. However, studies in the literature on RC structures damaged by fire have focused mostly on structural member tests at elevated temperat

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Fegade, Umesh, Sachin Kolate, Rajesh Dhake, Inamuddin, Tariq Altalhi, and Suvardhan Kanchi. "Adsorption of Congo Red on Pb doped FexOy: experimental study and theoretical modeling via double-layer statistical physics models." Water Science and Technology 83, no. 7 (2021): 1714–27. http://dx.doi.org/10.2166/wst.2021.077.

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Abstract Size-controlled Pb0.06Fe0.7O3 nanoparticles (Pb-FeONPs) were fabricated by the thermal co-precipitation method and characterized by FE-SEM, EDX, XRD, and IR techniques. The SEM and XRD images showed the average size distribution and average crystallite size of 19.21 nm and 4.9 nm, respectively. The kinetic model of Congo Red (CR) adsorption onto Pb-FeONPs was verified and found to be a pseudo-second-order reaction. The Langmuir plot was better fitted (R2 = 0.990) than other isotherm models with a Qmax (mg/g) of 500 for Congo Red (CR) dye in 40 min. The double-layer statistical physics

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Wan, Dong Jin, Dan Qu, Hua Xiao, Yong De Liu, Ting Lu, and Wen Qing Xu. "Adsorption of Chloride Anion from Aqueous Solution by Calcined (Mg-Al) Hydrotalcites of Different Mg/Al Ratio." Advanced Materials Research 233-235 (May 2011): 420–26. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.420.

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Hydrotalcites (HT-X) of different Mg/Al ratio (X is Mg/Al molar ratio, 3 and 4) was synthesized by co-precipitation method. Calcined HTLCs (CHT-X) at 500°C have been shown to recover their original layered structure by taking up chloride ion from aqueous solution. Adsorption of chloride by CHT-X was investigated in batch mode. The kinetics study showed that the pseudo-second-order kinetics model could be used to describe the adsorption process satisfactorily. The equilibrium isotherm showed that the Langmuir model gave a better fit to the experimental data than the Freundlich model. The maximu

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Zhao, Ruili, Xinxin Ma, Jinqiao Xu, and Qingming Zhang. "Removal of the pesticide imidacloprid from aqueous solution by biochar derived from peanut shell." BioResources 13, no. 3 (2018): 5656–69. http://dx.doi.org/10.15376/biores.13.3.5656-5669.

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Biochar is a carbon-rich product generated from the incomplete combustion of biomass through pyrolysis. Biochar plays an important role in removing pollutants from the environment. In this study, biochars were obtained from peanut shell agricultural waste by the limited-oxygen method at 300, 500, and 700 °C. The adsorption capacity of imidacloprid onto the biochar was increased with the increasing pyrolysis temperature. The solution temperature and biochar dosage had positive effects on the adsorption of imidacloprid. The adsorption capacity of the biochar on imidacloprid was increased with th

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Xie, Zhemin, Sijie Diao, Ruizheng Xu, et al. "Effective Removal of Dyes from Wastewater by Osmanthus Fragrans Biomass Charcoal." Molecules 28, no. 17 (2023): 6305. http://dx.doi.org/10.3390/molecules28176305.

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The exploration of low-cost, high-performance adsorbents is a popular research issue. In this work, a straightforward method that combined hydrothermal with tube firing was used to produce Osmanthus fragrans biomass charcoal (OBC) from low-cost osmanthus for dye adsorption in water. The study examined the parameters of starting concentration, pH, and duration, which impacted the process of adsorption of different dyes by OBC. The analysis showed that the adsorption capacities of OBC for six dyes: malachite green (MG, C0 = 800 mg/L, pH = 7), Congo red (CR, C0 = 1000 mg/L, pH = 8), rhodamine B (

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Ali, Ashraf, Sarah Alharthi, Bashir Ahmad, Alia Naz, Idrees Khan, and Fazal Mabood. "Efficient Removal of Pb(II) from Aqueous Medium Using Chemically Modified Silica Monolith." Molecules 26, no. 22 (2021): 6885. http://dx.doi.org/10.3390/molecules26226885.

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The adsorptive removal of lead (II) from aqueous medium was carried out by chemically modified silica monolith particles. Porous silica monolith particles were prepared by the sol-gel method and their surface modification was carried out using trimethoxy silyl propyl urea (TSPU) to prepare inorganic–organic hybrid adsorbent. The resultant adsorbent was evaluated for the removal of lead (Pb) from aqueous medium. The effect of pH, adsorbent dose, metal ion concentration and adsorption time was determined. It was found that the optimum conditions for adsorption of lead (Pb) were pH 5, adsorbent d

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Önal, Emel Simla, Tolga Yatkın, Tural Aslanov, Memduha Ergüt, and Ayla Özer. "Biosynthesis and Characterization of Iron Nanoparticles for Effective Adsorption of Cr(VI)." International Journal of Chemical Engineering 2019 (May 2, 2019): 1–13. http://dx.doi.org/10.1155/2019/2716423.

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In this study, iron nanoparticles (FeNPs) were synthesized via a green method using loquat (Eriobotrya japonica) leaves aqueous extract as a renewable reducing agent. The synthesized FeNPs were characterized by DLS, XRD, FT-IR, SEM/EDX, and TEM analysis, and then, they were used as an adsorbent for Cr(VI) removal from aqueous solutions. Batch adsorption experiments were carried out to investigate the optimum adsorption parameters such as the initial pH of the solution, temperature, initial Cr(VI) concentration, and adsorbent concentration. The optimum adsorption conditions were determined as i

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Pluangklang, Chutima, and Kunwadee Rangsriwatananon. "Facile Method by Bentonite Treated with Heat and Acid to Enhance Pesticide Adsorption." Applied Sciences 11, no. 11 (2021): 5147. http://dx.doi.org/10.3390/app11115147.

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In this work, simple conditions were applied to modify bentonite for the removal of pesticides from aqueous solution. Bentonite was modified in a single step as BA0.5 (with HCl 0.5 M) and BC500 (calcined at 500 °C) and combined steps with different sequences (BA0.5C500 and BC500A0.5). These adsorbents were characterised by XRD, XRF, FT-IR, 27Al MAS NMR, BET, NH3-TPD, TGA, HPLC, particle size analysis and zeta potential. Single-component adsorption with atrazine, diuron, 2,4-D and paraquat was used in aqueous solution at various pesticide concentrations, contact times and pH levels. It was foun

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