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Journal articles on the topic 'Desorption and adsorption isotherm'

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Published: 3 June 2025

Last updated: 31 July 2025

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1

Mwevura, Haji, Peter Nkedi-Kizza, Michael Kishimba, and Henrik Kylin. "Adsorption-desorption of chlorpyrifos in soils and sediments from the Rufiji Delta, Tanzania." Western Indian Ocean Journal of Marine Science 19, no. 1 (2020): 77–97. http://dx.doi.org/10.4314/wiojms.v19i1.7.

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Batch adsorption-desorption equilibrium techniques were used to investigate the adsorption capacity and influence of salinity on partitioning of the insecticide chlorpyrifos between water and soil or water and sediments from the Rufiji Delta. The data were fitted to different adsorption-desorption models and the hysteresis index was calculated using the ratio between the Freundlich exponents for desorption and adsorption, and secondly, the difference in area under the normalized adsorption and desorption isotherms using the maximum adsorbed and solution concentrations. The data showed non-line

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2

Al-Baiaty, Sarah, and Abdelmalek Bouazza. "Vapour Multicycle Sorption of a Cement–Bentonite Cutoff Wall Material: Hysteresis Effects." Water 15, no. 13 (2023): 2469. http://dx.doi.org/10.3390/w15132469.

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This paper examines the effects of multicycles of desorption/adsorption on the water isotherms of a typical cement–bentonite mixture. These water isotherms were evaluated over a relative humidity (RH) range of 90% and 0.3%. This study shows that, after the first adsorption–desorption cycle, the subsequent cycle shifted the water isotherm curves upward, particularly at RH < 70%, with a high degree of hysteresis. In contrast, at RH > 70%, the water isotherm curves shifted slightly downward with a low degree of hysteresis. The overall degree of hysteresis slightly decreased with the subsequ

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3

Zytner, Richard, Nihar Biswas, and Jatinder K. Bewtra. "Adsorption and desorption of perchloroethylene in soils, peat moss, and granular activated carbon." Canadian Journal of Civil Engineering 16, no. 6 (1989): 798–806. http://dx.doi.org/10.1139/l89-123.

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Studies were conducted to evaluate the adsorption–desorption isotherms of a common dry cleaning solvent, perchloroethylene (PCE), in soils, peat moss, and granular activated carbon. The results obtained followed the Freundlich Isotherm, and the organic carbon content of the media was the most significant controlling factor in the adsorption–desorption process. The peat moss exhibited the highest residual saturation concentration for pure PCE amongst all the media tested. The desorption studies indicated that PCE had medium mobility in soil and was not significantly affected by moderate changes

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4

O., P. Bansal, and Kumar Gupta Sanjeev. "Adsorption-desorption of carbofuran in soils." Journal of Indian Chemical Society Vol. 82, Nov 2005 (2005): 989–93. https://doi.org/10.5281/zenodo.5824828.

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Chemistry Department. D. S. College, Aligarh-202 001, India <em>Manuscript received 7 March 2005. revised 25 July 2005. accepted 29 July 2005</em> The results of these studies showed that adsorption of carbofuran on Fe-, Mn- and Cu-saturated soils increased upto the pH 6 and thereafter decreased. The values of 1/n which reflects the curvature in the adsorption isotherms were more than unity indicating a 'S' type of isotherm. Adsorption followed the order : black > red > alluvial soil. The order of adsorption in presence of different transitionl metals was : Fe- > Mn- > Cu-.

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5

Mashile, Geaneth Pertunia, Kgokgobi Mogolodi Dimpe, and Philiswa Nosizo Nomngongo. "A Biodegradable Magnetic Nanocomposite as a Superabsorbent for the Simultaneous Removal of Selected Fluoroquinolones from Environmental Water Matrices: Isotherm, Kinetics, Thermodynamic Studies and Cost Analysis." Polymers 12, no. 5 (2020): 1102. http://dx.doi.org/10.3390/polym12051102.

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The application of a magnetic mesoporous carbon/β-cyclodextrin–chitosan (MMPC/Cyc-Chit) nanocomposite for the adsorptive removal of danofloxacin (DANO), enrofloxacin (ENRO) and levofloxacin (LEVO) from aqueous and environmental samples is reported in this study. The morphology and surface characteristics of the magnetic nanocomposite were investigated by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) adsorption–desorption and Fourier transform infrared spectroscopy (FTIR). The N2 adsorption–desorption results revealed that the prepared nanocomposite was mesoporous and the BET surface ar

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6

Chen, Qing, Yuanyuan Tian, Peng Li, et al. "Study on Shale Adsorption Equation Based on Monolayer Adsorption, Multilayer Adsorption, and Capillary Condensation." Journal of Chemistry 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/1496463.

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Shale gas is an effective gas resource all over the world. The evaluation of pore structure plays a critical role in exploring shale gas efficiently. Nitrogen adsorption experiment is one of the significant approaches to analyze pore size structure of shale. Shale is extremely heterogeneous due to component diversity and structure complexity. Therefore, adsorption isotherms for homogeneous adsorbents and empirical isotherms may not apply to shale. The shape of adsorption-desorption curve indicates that nitrogen adsorption on shale includes monolayer adsorption, multilayer adsorption, and capil

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7

Berez, A., F. Ayari, N. Abidi, G. Schäfer, and M. Trabelsi-Ayadi. "Adsorption-desorption processes of azo dye on natural bentonite: batch experiments and modelling." Clay Minerals 49, no. 5 (2014): 747–63. http://dx.doi.org/10.1180/claymin.2014.049.5.10.

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AbstractThe purpose of this study was to determine whether a bentonite from the Gafsa deposit (western Tunisia) could be used to remove the Foron Blue 291 (FB) azo dye from wastewater. Batch adsorption and desorption experiments were conducted using untreated and purified bentonite and the influence of contact time, pH, adsorbent mass and temperature of the dye solution on the adsorption of FB was evaluated. Kinetic and isotherm data were fitted using two non-linear kinetic and two non-linear isotherm equations. In addition, the fits were evaluated using the coefficient of determination (R2) a

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8

Shen, Liya, Jing Xu, Xinru Wang, and Yuanli Liu. "Maleic Anhydride-Modified Water Hyacinth for Adsorption of Methylene Blue and Methyl Violet." Processes 12, no. 10 (2024): 2290. http://dx.doi.org/10.3390/pr12102290.

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Removal of toxic pollutants is of the greatest concerns facing wastewater treatment. In this study, a chemical modification method was used to prepare the maleic anhydride-modified water hyacinth (MA-EC) for the removal of methylene blue (MB) and methyl violet (MV) from water. The maleic anhydride-modified water hyacinth biosorbent was characterized and adsorption experiments were conducted. The prepared MA-EC demonstrated considerable adsorptive efficiency toward MV and MB. It was confirmed that the maximum adsorptive capacities were 1373.58 and 434.70 mg/g for MV and MB, respectively. The ad

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9

Shim, Wang-Geun, Hyun-Chul Kang, Chan Kim, et al. "Heterogeneity Analysis of Single-Walled Carbon Nanotubes from the Adsorption Equilibria of Nitrogen and Benzene." Journal of Nanoscience and Nanotechnology 6, no. 11 (2006): 3583–88. http://dx.doi.org/10.1166/jnn.2006.17987.

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Nitrogen adsorption/desorption isotherms and gravimetric methods were employed to examine the structural and adsorption properties of selected adsorbent. The equilibrium data of benzene were also obtained at three different temperatures (303.15, 313.15, and 323.15 K) with pressures up to 7 kPa. The results of nitrogen and benzene sorption isotherm revealed that SWCNTs exhibit type II with the features of type I. The Toth and UNILAN models were found to provide a reasonable correlation between the adsorption isotherm data. In addition, the adsorption second virial coefficient and the isosteric

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10

Ge, Mingliang, Xubin Wang, Mingyi Du, Guodong Liang, Guoqing Hu, and Jahangir S.M. "Adsorption Analyses of Phenol from Aqueous Solutions Using Magadiite Modified with Organo-Functional Groups: Kinetic and Equilibrium Studies." Materials 12, no. 1 (2018): 96. http://dx.doi.org/10.3390/ma12010096.

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Organically-modified magadiite (MAG–CTAB–KH550) was synthesized via ion-exchange method and condensation reaction in the presence of pure magadiite (MAG), cetyltrimethylammonium bromide (CTAB) and γ-aminopropyltriethoxysilane (KH550) in aqueous solution in this research. This new adsorbent material was studied using scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), and N2 adsorption/desorption isotherms process. It was found that the MAG–CTAB–KH550 has high Brunaur-Emmet-Teller (BET) specific surface area and mesoporous pore size dist

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11

Yu, Wei, Kamy Sepehrnoori, and Tadeusz W. Patzek. "Modeling Gas Adsorption in Marcellus Shale With Langmuir and BET Isotherms." SPE Journal 21, no. 02 (2016): 589–600. http://dx.doi.org/10.2118/170801-pa.

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Summary Production from shale-gas reservoirs plays an important role in natural-gas supply in the United States. Horizontal drilling and multistage hydraulic fracturing are the two key enabling technologies for the economic development of these shale-gas reservoirs. It is believed that gas in shale reservoirs is mainly composed of free gas within fractures and pores and adsorbed gas in organic matter (kerogen). It is generally assumed in the literature that the monolayer Langmuir isotherm describes gas-adsorption behavior in shale-gas reservoirs. However, in this work, we analyzed four experim

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12

Ekundayo, Jamiu M., and Reza Rezaee. "Volumetric Measurements of Methane-Coal Adsorption and Desorption Isotherms—Effects of Equations of State and Implication for Initial Gas Reserves." Energies 12, no. 10 (2019): 2022. http://dx.doi.org/10.3390/en12102022.

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This study presents the effects of equations of state (EOSs) on methane adsorption capacity, sorption hysteresis and initial gas reserves of a medium volatile bituminous coal. The sorption experiments were performed, at temperatures of 25 °C and 40 °C and up to 7MPa pressure, using a high-pressure volumetric analyzer (HPVA-II). The measured isotherms were parameterized with the modified (three-parameter) Langmuir model. Gas compressibility factors were calculated using six popular equations of state and the results were compared with those obtained using gas compressibility factors from NIST-R

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13

Kamal, Sanarya K., and Ammar S. Abbas. "Textural Properties Characterization for NaX and FeX Zeolites by Nitrogen Adsorption-desorption Technique." Iraqi Journal of Chemical and Petroleum Engineering 23, no. 4 (2022): 33–41. http://dx.doi.org/10.31699/ijcpe.2022.4.5.

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The zeolite's textural properties have a significant effect on zeolite's effectiveness in the different industrial processes. This research aimed to study the textual properties of the NaX and FeX zeolites using the nitrogen adsorption-desorption technique at a constant low temperature. According to the International Union of Pure and Applied Chemistry, the adsorption-desorption isotherm showed that the studied materials were mixed kinds I/II isotherms and H3 type hysteresis. The Brunauer-Emmett-Teller isotherm was the best model to describe the nitrogen adsorption-desorption better than the L

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14

O., P. Bansal. "Effect of different organic material on lead adsorption in soils of Aligarh district." Journal of Indian Chemical Society Vol. 85, Jan 2008 (2008): 59–63. https://doi.org/10.5281/zenodo.5808536.

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Chemistry Department, D. S. College, Aligarh-202 001, Uttar Pradesh, India <em>E-mail :</em> drop31@rediffmail.com <em>Manuscript received 19 June 2006, revised 19 September 2007, accepted 25 September 2007</em> The effect of different organic material (FYM, sewage sludge and poultry litter) on adsorption-desorption of lead on three soil samples of Aligarh district was studied. The adsorption isotherms were of 'L' type and adsorption-desorption data conformed to Freundlich isotherm equation. The adsorption increased with the increase in organic material and followed the order : sewage

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15

Zheng, Jiale, Chuanruo Yang, Ming Xue, Xingchun Li, and Xinglei Zhao. "Mass Transfer Kinetics of Volatile Organic Compound Desorption from a Novel Adsorbent." Processes 12, no. 9 (2024): 2031. http://dx.doi.org/10.3390/pr12092031.

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The adsorption isotherms and intraparticle mass transfer coefficients of a novel adsorbent with various VOCs at different temperatures during the desorption process are investigated. Firstly, the adsorption isotherms of an HCP-5 adsorbent with o-xylene and ethyl acetate systems were determined at temperatures ranging from 30 to 160 °C, and the data were fitted using the Langmuir adsorption isotherm equation. Subsequently, a mathematical model for the fixed-bed desorption breakthrough of VOCs was established. By combining with fixed-bed desorption breakthrough experiments, the intraparticle mas

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16

Masini, Jorge Cesar, and Gilberto Abate. "Guidelines to Study the Adsorption of Pesticides onto Clay Minerals Aiming at a Straightforward Evaluation of Their Removal Performance." Minerals 11, no. 11 (2021): 1282. http://dx.doi.org/10.3390/min11111282.

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Natural and modified clay minerals have been extensively used for the adsorption/desorption of organic substances, especially pesticides, from waters and wastewater, aiming at pollution control and more efficient use of the herbicides through controlled release. While natural clay minerals efficiently remove organic cations such as paraquat and diquat, the adsorption of anionic or neutral species demands surface chemical modification with, for instance, quaternary ammonium salts containing long alkyl chains. Basic pesticides, on the other hand, are better absorbed in clay minerals modified wit

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17

Chen, Jun Tao, Yue Xin Han, Shu Fang Ding, and Shui Lin Zheng. "The Adsorption Performance Study of Acid Leaching Residue of Asbestos Tailings." Materials Science Forum 685 (June 2011): 246–52. http://dx.doi.org/10.4028/www.scientific.net/msf.685.246.

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Acid leaching residue of asbestos tailings was calcined at 600°C. N2adsorption and desorption isotherms of this modified mineral material were measured at low temperature and the adsorption characteristic of acid leaching residue as well as the mechanism were discussed. The specific surface area of acid leaching residue was calculated by BET model, and meanwhile micropore and mesopore structural parameters were calculated by means of ‘t-Plot’ and BJH theory, respectively. The results showed that the N2adsorption-desorption isotherms of acid leaching residue were in line withⅠpattern of the IUP

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18

Bolan, NS, and S. Baskaran. "Biodegradation of 2,4-D herbicide as affected by Its adsorption-desorption behaviour and microbial activity of soils." Soil Research 34, no. 6 (1996): 1041. http://dx.doi.org/10.1071/sr9961041.

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The adsorption-desorption behaviour and the degradation of an ionic herbicide (2,4-D) were examined using 10 soils from New Zealand that differed in their organic matter and clay content. Adsorption isotherms for 2,4-D were adequately described by the Freundlich isotherm and the values of the exponent N of the Freundlich isotherm were close to 1 (0.92-0.98), indicating that the adsorption isotherm tended to become linear. The extent of adsorption, as measured by the distribution coefficient (Kd), increased with an increase in soil organic carbon. The rate of desorption of 2,4-D followed first-

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19

Luthra, Kaushik, Soraya Shafiekhani, Sammy S. Sadaka, and Griffiths G. Atungulu. "Determination of Moisture Sorption Isotherms of Rice and Husk Flour Composites." Applied Engineering in Agriculture 36, no. 6 (2020): 859–67. http://dx.doi.org/10.13031/aea.13822.

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HighlightsMoisture sorption isotherms of rice and husk flour composites were determined.Adsorption isotherms were best modeled by the Chung-Pfost and Oswin equations.Desorption isotherms were best modeled by the Polynomial and Chung-Pfost equations.The Modified Oswin model was the best for both adsorption and desorption.Abstract. Empirical models describing isotherms specifically for adsorption and desorption have not been described for rough rice and husk flour composites. Such models are vital for process control and monitoring operations which use rice husk and rice flours or their mixtures

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20

Liu, Chang, Xiaoyu Li, Hongdong Song, and Xingjun Li. "Moisture Sorption Isotherms of Polydextrose and Its Gelling Efficiency in Inhibiting the Retrogradation of Rice Starch." Gels 10, no. 8 (2024): 529. http://dx.doi.org/10.3390/gels10080529.

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As an anti-staling agent in bread, the desorption isotherm of polydextrose has not been studied due to a very long equilibrium time. The adsorption and desorption isotherms of five Chinese polydextrose products were measured in the range of 0.1–0.9 aw and 20–35 °C by a dynamic moisture sorption analyzer. The results show that the shape of adsorption and desorption isotherms was similar to that of amorphous lactose. In the range of 0.1–0.8 aw, the hysteresis between desorption and adsorption of polydextrose was significant. The sorption isotherms of polydextrose can be fitted by seven commonly

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21

MALIK, N., and D. S. H. DRENNAN. "ADSORPTION-DESORPTION EQUILIBRIA OF 14C-FLURIDONE AT LOW SOLUTION CONCENTRATIONS AND SOIL:WATER RATIOS." Canadian Journal of Soil Science 69, no. 3 (1989): 567–77. http://dx.doi.org/10.4141/cjss89-057.

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The adsorption and desorption of 14C-fluridone (1-methyl-3-phenyl-5-[3-(trifluoromethyl) phenyl]-4(1 H)-pyridinone) were investigated at 1:1 and 1:5 soil:water ratios at solution concentrations ranging from 11.9 to 1190 ng mL−1, simulating herbicide concentrations under field conditions from recommended rates of application. Freundlich adsorption isotherms were developed for a sandy loam, sandy clay loam and silty clay soil. At 1:1 soil:water ratio, as initial herbicide concentration in the system increased 20 fold, the soil solution concentration at adsorption equilibrium increased by 86, 87

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22

Jiang, Xiuping, Xiuping Jiang, Huanhuan Li, et al. "Moisture Sorption Isotherms and Isosteric Heats of Sorption of High-Pressure Treated Paulownia Wood under Different Storage Conditions." Transactions of the ASABE 62, no. 1 (2019): 105–14. http://dx.doi.org/10.13031/trans.12899.

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Abstract. Understanding of moisture sorption isotherms (MSI) is critical for predicting the stability of wood during handling, transport, and storage. The aim of this study was to evaluate the adsorption and desorption isotherm characteristics of high-pressure (HP) treated paulownia wood and to identify the best-fitting model to describe its sorption behavior. The equilibrium moisture contents (EMCs) of HP-treated paulownia wood were obtained using a static gravimetric method under different storage conditions: three temperatures (20°C, 30°C, and 40°C) and five water activity (aw) levels (0.32

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23

Abu Tahari, Maratun Najiha, Azizul Hakim, Tengku Sharifah Marliza Tengku Azmi, Wan Nor Roslam Wan Isahak, Mohamed Wahab Mohamed Hisham, and Mohd Ambar Yarmo. "Studies on Adsorption-Desorption of CO₂ by Long Chain Fatty Amine Supported on SiO₂." Materials Science Forum 840 (January 2016): 343–47. http://dx.doi.org/10.4028/www.scientific.net/msf.840.343.

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The capture of carbon dioxide (CO2) molecules was achieved by utilizing impregnated long chain fatty amine solid sorbents. The long chain fatty amine impregnated on these solid substrates was octadecylamine (ODA) to improve CO2 adsorption-desorption capacity. The amine-loaded samples were characterized using nitrogen, N2 adsorption-desorption isotherm of Brunauer-Emmet-Teller (BET) and thermogravimetry analyzer (TGA). The prepared 25 wt % ODA/SiO2 exhibit acceptable CO2 capture capacities of 2.45 wt % CO2/adsorbent at 25 °C by using CO2 adsorption-desorption isotherm. TG profile shows that the

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24

Liu, Fengtai, Shanshan Song, Ge Cheng, Wenjing Xiong, Lei Shi, and Yibo Zhang. "MIL-101(Cr) metal–organic framework functionalized with tetraethylenepentamine for potential removal of Uranium (VI) from waste water." Adsorption Science & Technology 36, no. 7-8 (2018): 1550–67. http://dx.doi.org/10.1177/0263617418789516.

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The metal–organic frameworks material functionalized by grafting amino group of tetraethylenepentamine on the coordinative unsaturated Cr (III) centers is described. The obtained tetraethylenepentamine-functionalized adsorbents with different mass ratios of tetraethylenepentamine have been characterized by scanning electron microscopy, Fourier-transform infrared, X-ray powder diffraction, and N2 adsorption and desorption isotherms. Significantly, MIL-101-tetraethylenepentamine 60% exhibited high adsorption capacity (350 mg/g) for removal of uranium (VI) from water at pH 4.5. At uranium concent

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Labiebah, Ghina, Gunawan Gunawan, Muhammad Cholid Djunaidi, Abdul Haris, and Didik Setiyo Widodo. "Removal of Methylene Blue Using Used Paper Powder." Jurnal Kimia Sains dan Aplikasi 22, no. 1 (2019): 23–28. http://dx.doi.org/10.14710/jksa.22.1.23-28.

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Methylene blue removal by adsorption method had been done in batch method using adsorbent of used paper powder. Adsorption parameters covering adsorbent doses, contact times, pH, adsorbate concentrations and adsorption isotherm as well as desorption study of the absorbed methylene blue were evaluated. The results showed the highest adsorption of methylene blue was obtained at an optimum adsorbent dose, for 30 min at pH > 9. The maximum adsorption capacity of 30.77 mg/g was obtained with Langmuir isotherm model. While the effective methylene blue desorption on the used paper powder adsorbent

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Zhou, Yanhui, Lu Zhang, and Yuan Li. "Preparation and Application of Responsive Nanocellulose Composites." Polymers 16, no. 11 (2024): 1446. http://dx.doi.org/10.3390/polym16111446.

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Cellulose nanofibrils/poly(N-Isopropylacrylamide) semi-interpenetrating networks (MMCNF-PNAs) were synthesized using an in situ fabrication (semi-IPN). The polymerization of N-isopropylacrylamide (NIPAM) (free radical) was conducted in the presence of magnetic modified cellulose nanofibrils (MMCNFs). The adsorption behaviors and surface morphology of the synthesized adsorbents were investigated systematically. The adsorption behaviors of the as-prepared MMCNF-PNA towards methylene blue (MB, as the model contaminant) dye was studied, and the optimal adsorption conditions were also studied. The

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Lahuri, Azizul Hakim, Mohd Ambar Yarmo, Maratun Najiha Abu Tahari, et al. "Comparative Adsorption Isotherm for Beryllium Oxide/Iron (III) Oxide Toward CO₂ Adsorption and Desorption Studies." Materials Science Forum 1010 (September 2020): 361–66. http://dx.doi.org/10.4028/www.scientific.net/msf.1010.361.

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Surface modification of Fe2O3 by adding BeO was synthesized and calcined at different temperatures of 200-600 °C. The adsorbents were characterized by using XRD, N2 adsorption-desorption isotherm prior to performing CO2 adsorption and desorption studies. The CO2 adsorption data were analyzed using adsorption isotherm models such as Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich. BeO/Fe2O3-300 that calcined at 300 °C showed the most efficient adsorbent with physisorption and chemisorption were measured at 5.85 and 45.88 mg/g respectively. The CO2 adsorption notably best fitted with Freu

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Seyedvakili, Farnaz, and Mohammad Samipoorgiri. "Thermo-kinetic investigation of heavy metal ions adsorption onto lignin considering coupled adsorption–desorption mechanisms: Modeling and experimental validation." International Journal of Modeling, Simulation, and Scientific Computing 09, no. 02 (2018): 1850014. http://dx.doi.org/10.1142/s1793962318500149.

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A coupled adsorption–desorption thermo-kinetic model is developed incorporating both adsorption and desorption reactions. A local pseudo-equilibrium condition at the interface of adsorbent and adsorbate bulk phases was used as isotherm equation which can even be applied for multi-pollutants scenarios. The developed model is then validated using collected experimental data of heavy metal ions (Pb, Cu, Cd, Zn, and Ni). Comparisons were made for a number of isotherm and kinetic models to examine the performance of the proposed model. The developed model revealed desirable accuracy and superiority

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Zhang, Ming, Zhu Ding, Peng Liu, Ming Ke Wang, and Feng Xing. "Research of Pore Structure of Phosphoaluminate Cement Paste Using Nitrogen Adsorption Isotherm." Advanced Materials Research 129-131 (August 2010): 1376–80. http://dx.doi.org/10.4028/www.scientific.net/amr.129-131.1376.

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Phosphoaluminate cement (PAC) sets quickly and develops high early strength. As a novel cementitious material, its hydration mechanism and microstructure are more complex than ordinary cement. Based on nitrogen adsorption isotherm method, investigated characteristic of adsorption isotherm of PAC paste, adsorption loop and pore distribution at different hydration period with various W/C ratio, results show that adsorption and desorption isotherm are tight relate to pore structure and pore distribution. In addition, the study analyzed the scope of application of nitrogen adsorption isotherm meth

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Luo, Li Jun, Ping Bao Ban, Xue Jiao Huang, and Jun Hong Li. "Functionalized Mesporous Silica with Ethylenediamine for Removal of Pb(II)." Applied Mechanics and Materials 395-396 (September 2013): 610–14. http://dx.doi.org/10.4028/www.scientific.net/amm.395-396.610.

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Amine-functionalized mesporous silicas ((referred as NH2MS)) were synthesized by grafting with ethylenediamine. The obtained materials have been characterized by N2 adsorption desorption measurement (BET). Adsorption behaviors of the adsorbent for lead (containing effects factors, kinetics, isotherms, thermodynamics) were investigated. The result indicated that the obtained particles possessed mesoporous structrure. The Pb (II) adsorption isotherm and kinetic data fit Freundlich model and the pseudo second-order kinetic model respectively. the adsorption of Pb (II) onto NH2-MS was an enothermi

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Jia, Hongyu, and Ningning Liu. "Adsorptive removal of Rhodamine B from aqueous solution by nanoporous polydivinylbenzene." Water Science and Technology 75, no. 7 (2017): 1651–58. http://dx.doi.org/10.2166/wst.2017.029.

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Nanoporous polydivinylbenzene (PDVB) material has been successfully prepared via the copolymerization of divinylbenzene monomers. The nanoporous PDVB was characterized through N2 adsorption/desorption isotherms, Fourier transform infrared spectroscopy, scanning electron microscopy, and thermogravimetric analysis. The nanoporous PDVB as an adsorbent was applied for the removal of Rhodamine B (RhB). The adsorption behavior of PDVB for the removal of RhB showed that the isotherm data followed the Langmuir isotherm model and the kinetic adsorption obeyed the pseudo-second-order model. Thermodynami

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Rannou, P., D. Curtis, and M. A. Tolbert. "Adsorption isotherms and nucleation of methane and ethane on an analog of Titan’s photochemical aerosols." Astronomy & Astrophysics 631 (November 2019): A151. http://dx.doi.org/10.1051/0004-6361/201935777.

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In planetary atmospheres, adsorption of volatile molecules occurs on aerosols prior to nucleation and condensation. Therefore, the way adsorption occurs affects the subsequent steps of cloud formation. In the classical theory of heterogeneous nucleation, several physical quantities are needed for gas condensing on a substrate like aerosols, such as the desorption energies of the condensing gases on the substrate and the wetting parameters of the condensed phases on the substrate. For most planetary atmospheres, the values of such quantities are poorly known. In cloud models, these values are o

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Zhang, Lei, Naj Aziz, Ting Ren, Jan Nemcik, and Shihao Tu. "Influence of Coal Particle Size on Coal Adsorption and Desorption Characteristics." Archives of Mining Sciences 59, no. 3 (2014): 807–20. http://dx.doi.org/10.2478/amsc-2014-0056.

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Abstract Accurate testing coal isotherm can play a significant role in the areas of coal seam gas drainage, outburst control, CO2 geo-sequestration, coalbed methane (CBM) and enhanced coalbed methane recovery (ECBM) etc. The effect of particle size on the CO2 and CH4 sorption capacity of bituminous coal from Illawarra, Australia was investigated at 35°C and at pressure up to 4 MPa. A unique indirect gravimetric apparatus was used to measure the gas adsorption and desorption isotherms of coal of different particle sizes ranging from around 150 urn to 16 mm. Langmuir model was used to analysis t

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Peng, Zhigao, Shenggui Liu, Yingjun Li, Zongwei Deng, and Haoxiong Feng. "Pore-Scale Lattice Boltzmann Simulation of Gas Diffusion–Adsorption Kinetics Considering Adsorption-Induced Diffusivity Change." Energies 13, no. 18 (2020): 4927. http://dx.doi.org/10.3390/en13184927.

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The diffusion–adsorption behavior of methane in coal is an important factor that both affecting the decay rate of gas production and the total gas production capacity. In this paper, we established a pore-scale Lattice Boltzmann (LB) model coupled with fluid flow, gas diffusion, and gas adsorption–desorption in the bi-dispersed porous media of coalbed methane. The Knudsen diffusion and dynamic adsorption–desorption of gas in clusters of coal particles were considered. Firstly, the model was verified by two classical cases. Then, three dimensionless numbers, Re, Pe, and Da, were adopted to disc

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Vasu, A. Edwin. "Adsorption of Ni(II), Cu(II) and Fe(III) from Aqueous Solutions Using Activated Carbon." E-Journal of Chemistry 5, no. 1 (2008): 1–9. http://dx.doi.org/10.1155/2008/690241.

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An activated carbon was tested for its ability to remove transition metal ions from aqueous solutions. Physical, Chemical and liquid-phase adsorption characterizations of the carbon were done following standard procedures. Studies on the removal of Ni(II), Cu(II) and Fe(III) ions were attempted by varying adsorbate dose, pH of the metal ion solution and time in batch mode. The equilibrium adsorption data were fitted with Freundlich, Langmuir and Redlich-Peterson isotherms and the isotherm constants were evaluated. Time variation studies indicate that adsorptions follow pseudo-second order kine

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Downarowicz, Dorota, and Katarzyna Ziętarska. "Adsorption of propan-1-ol vapour on Sorbonorit 4 activated carbon – equilibrium and dynamic studies." Polish Journal of Chemical Technology 19, no. 4 (2017): 59–64. http://dx.doi.org/10.1515/pjct-2017-0068.

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Abstract The study examined the adsorption of propan-1-ol (1PN) vapour on Sorbonorit 4 (S4) activated carbon in cyclic Electrothermal Temperature Swing Adsorption (ETSA) process. Dynamic adsorption capacity and breakthrough time were determined based on column studies. Thomas model was used to describe experimental breakthrough curves. Adsorption isotherms for 1PN vapour on S4 activated carbon were tested at 293 to 413 K. The experimental data were examined by using three multi-temperature isotherm models: Toth, Sips and hybrid Langmuir-Sips. Results indicate that S4 activated carbon is a hete

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Zhai, Qing-Zhou. "Removal of Pb (II) from Aqueous Medium by Nanostructured Mesoporous Material MCM-48: Studies on Equilibrium, Isotherm, Kinetics and Thermodynamics." Micro and Nanosystems 11, no. 2 (2019): 123–32. http://dx.doi.org/10.2174/1876402911666190422143914.

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Background: In recent years, with the progress of human civilization, environmental pollution is aggravating. Among them, heavy metal pollution is one of the greatest harmful water pollution problems. As a global pollution problem, heavy metal pollution, such as lead, has been given more attention by scientists. How to solve this problem, is an interesting issue. Objective: The aims of the current study are to develop the optimized adsorption conditions of Pb2+ by an MCM (Mobil Composition of Matter)-48 mesoporous molecular sieve material and study the properties of this adsorption. Method: Fi

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Pun-on, Duongdaw, Papawarin Ruangrit, Saksit Chuenchomnakjad, and Duangrat Thongkum. "Montmorillonite-Alginate Gel for Basic Red 51 Adsorption and Desorption." Journal of Science Ladkrabang 33, no. 2 (2024): 59–76. https://doi.org/10.55003/scikmitl.2024.260894.

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This research focused on the synthesis of the 6 formulas of sodium alginate gel bead mixed with montmorillonite clay mineral to be used for Basic red 51 dye adsorption. The influencing factors for the adsorption were studied such as the gel bead dosage, adsorption time, initial pH, and initial concentration of dye. The concentrations of residual dye in solution were followed up by UV-vis spectroscopy. The removal efficiency of formula 6 was 97.05%. The adsorption kinetic was best fitted to pseudo-second-order reaction and the adsorption isotherm confirmed Freundlich. Then Fourier transform inf

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Ahmed, Rasha Gharib, Kaouther AL-Habib Belgacem, and Hala Mohamed Abo-Dief. "Synthesis of New Porous Natural Membranes with Nanoparticles Used in Pollute Gas Removal From Petroleum Industries." Journal of Molecular Biology Research 8, no. 1 (2018): 159. http://dx.doi.org/10.5539/jmbr.v8n1p159.

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The aim of the present work is to follow the capacity of adsorption of CO2 by natural cellulose nanofibers, extracted from banana peel and mixed with nano-silver. Following initial characterization, the raw material and the isolated sample were investigated by Energy Dispersive Analysis (EDS), X-ray diffraction (XRD); Fourier- Transformed infrared spectroscopy (FT-IR) and thermal analysis (Hi Res TG). Nitrogen gas adsorption-desorption isotherms of isolated cellulose nanofibers reveal a type I- isotherm, specific to the nano-porous materials.The results of adsorption isotherms of CO2 at 304 K

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JOHN, BOSCO KAWONGOLO, I. MURANGA FLORENCE, and HENSEL OLIVER. "DETERMINATION OF THE SORPTION ISOTHERMS FOR Matooke (Musa sp., AAA-EAHB)." Journal of Advances in Food Science & Technology 4, no. 2 (2017): 52–61. https://doi.org/10.5281/zenodo.1411655.

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Banana, (<em>matooke</em>) <em>Musa </em>sp<em>.</em> triploid <em>acuminate </em>genome group (AAA-EAHB) is an important crop in Uganda.  <em>Matooke</em> flour contains more than 80% starch (db) which is good for both food and nonfood industrial applications, however, there is no information on moisture sorption isotherm for<em> matooke</em>. The main objective of the study was to establish the moisture sorption isotherms for <em>matooke</em> flour in order to standardize the stability of raw <em>matooke</em> flour with respect to microbiology and shelf life. The static gravitation meth

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Shao, Xing Hua, and Jiang Zhong Zhang. "Effect of Flooding Time on Phosphate Adsorption Desorption Characteristics of Two Acid Soils." Applied Mechanics and Materials 195-196 (August 2012): 1288–93. http://dx.doi.org/10.4028/www.scientific.net/amm.195-196.1288.

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In a laboratory incubation study, two soils were treated with distilled water, and flooded for a period of 0 (contr-ol), 1, 2, 3, 4, 8 weeks. P adsorption desorption characteristics of two soils were measured at the end of the incubation period. P a-dsorption increased with increasing levels of added P in two soi-ls. P adsorption of Paddy soil was comparatively lower than that of upland red soil. P adsorption data was found to fit Langmuir isotherms for two soils. Soil P adsorption maxima obtained from Langmuir isotherm varied from 1190 to 672 mg/kg for upland r-ed soil, and varied from 708 to

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Cao, Xiao-qiang, Fei Xiao, Xiao-yu Xie, et al. "Adsorption and desorption of Hg(II) from aqueous solution using magnetic Fe3O4@PPy composite microspheres." Journal of Water Reuse and Desalination 11, no. 3 (2021): 347–60. http://dx.doi.org/10.2166/wrd.2021.080.

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Abstract Functional magnetic Fe3O4@PPy microspheres were prepared and characterized by XRD, FTIR, SEM, TEM, and magnetometer, and the adsorption of Hg(II) onto Fe3O4@PPy was investigated. The results showed that the adsorption of Hg(II) onto Fe3O4@PPy dramatically increases within 5 min and reaches adsorption equilibrium at 200 min. The adsorption of Hg(II) increases with pH increased, and a removal efficiency (RE) of 90.5% was obtained at pH 7.2. The isotherm studies revealed that the adsorption of Hg(II) onto the Fe3O4@PPy fits well with the Langmuir isotherm model, and the calculated qm val

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Elhleli, Hanedi, Faten Mannai, Mongi ben Mosbah, Ramzi Khiari, and Younes Moussaoui. "Biocarbon Derived from Opuntia ficus indica for p-Nitrophenol Retention." Processes 8, no. 10 (2020): 1242. http://dx.doi.org/10.3390/pr8101242.

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Activated carbon obtained from Opuntia ficus indica by sodium hydroxide activation was employed for the adsorption of p-nitrophenol from water. The activated carbons obtained were characterized by Fourier transforms infrared spectroscopy, sorption of nitrogen, scanning electron microscopy, and Boehm titration. Effects of pH, contact time, amount of adsorbent, and temperature on the adsorption of p-nitrophenol were studied. Adsorption isotherms were analyzed using Freundlich, Langmuir, Temkin, and Dubinin-Radushkevich models, and the thermodynamic parameters have been determined. The adsorption

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Ajduković, Marija, Gordana Stevanović, Sanja Marinović, et al. "Ciprofloxacin Adsorption onto a Smectite–Chitosan-Derived Nanocomposite Obtained by Hydrothermal Synthesis." Water 15, no. 14 (2023): 2608. http://dx.doi.org/10.3390/w15142608.

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The employment of compounds obtained from natural sources to produce adsorbents and their application in the elimination of antibiotics from industrial effluents have gained significant attention because of their low production cost and sustainability. Herein, chitosan (biopolymer) and smectite (abundant clay mineral) were used for the low-cost and eco-friendly synthesis of a new type of adsorbent. A low-energy-consumption hydrothermal process was applied to the synthesis of the chitosan-derived carbon–smectite nanocomposite with cobalt (H_Co/C-S). The produced nanocomposite was characterized

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Fouad, Mohamed Riad. "Physical characteristics and Freundlich model of adsorption and desorption isotherm for fipronil in six types of Egyptian soil." Current Chemistry Letters 12, no. 1 (2023): 207–16. http://dx.doi.org/10.5267/j.ccl.2022.8.003.

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The soil type and temperature are considered important parameters that can influence the rates and equilibria of different environmental processes. Therefore, the adsorption and desorption isotherms of fipronil in clay loam, clay, sandy loam, sandy clay loam, sand and loamy sand soils at 25 and 50˚C was studied. The amount of fipronil adsorbed and desorbed by different soils was significantly influenced by the temperature. Adsorption was higher in clay loam, clay, sandy clay loam and sandy soil at 25°C, while sand soil and loamy sand soil at 50°C. The non-desorbed amount was greater at 25°C in

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Eckl, Karl, and Hans Gruler. "Description of Cell Adhesion by the Langmuir Adsorption Isotherm." Zeitschrift für Naturforschung C 43, no. 9-10 (1988): 769–76. http://dx.doi.org/10.1515/znc-1988-9-1022.

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Abstract The adhesion of granulocytes to a glass surface is both theoretically and experimentally investigated. The basic results are: (i) The adherence process of cells to a surface can be described by the Langmuir adsorption isotherm which also holds for the adsorption of molecules to a substrate. (ii) The granulocytes do not interact with each other during the adsorption/desorption process. (iii) The equilibrium constant at 37 °C for granulocytes adsorption to the glass surface is 170 cells/mm3 = 1.7 × 105 cells/ml. (iv) The equilibrium constant increases with decreasing temperature, (v) Th

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Samiey, Babak, and Somayeh Golestan. "Adsorption of triton X-100 on silica gel: effects of temperature and alcohols." Open Chemistry 8, no. 2 (2010): 361–69. http://dx.doi.org/10.2478/s11532-009-0135-7.

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AbstractAdsorption of Triton X-100 (TX-100) on silica gel has been studied as a function of temperature (308–328 K) and composition for mixtures of water with ethanol or t-butanol. The adsorption capacity of silica gel for TX-100 decreases with increase in alcohol content. Adsorption isotherms of TX-100 on silica gel are four-region and were analyzed using the ARIAN (adsorption isotherm regional analysis) model. Data in regions 2, 3 and 4 were fitted to the Temkin, bilayer and reverse desorption isotherms, respectively. The results show that adsorption of TX-100 on silica gel in water and alco

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Loffredo, Elisabetta, and Nicola Senesi. "Fate of anthropogenic organic pollutants in soils with emphasis on adsorption/desorption processes of endocrine disruptor compounds." Pure and Applied Chemistry 78, no. 5 (2006): 947–61. http://dx.doi.org/10.1351/pac200678050947.

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After providing a brief overview of the various phenomena that anthropogenic organic pollutants (AOPs) of various nature and origin are subjected to in soil, the paper focuses on an important class of these, the endocrine disruptor compounds (EDCs), which are hormone-like substances able to alter (i.e.) disrupt, the normal endocrine functions in animals and humans. EDCs may enter the soil through current agricultural practices andor disposal of urban and industrial effluents, sludges, and wastes. The estrogenic risk of EDCs is generally related to their distribution and speciation in the vario

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Cheng, Lei Lei, Xiao Dong Wei, Xiao Lei Hao, Di Ruan, and Shao Ming Yu. "The Removal of Strontium(II) and Neodymium(III) from their Aqueous Solutions on Chrysotile Nanotubes." Advanced Materials Research 881-883 (January 2014): 519–24. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.519.

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In this research, chrysotile nanotubes (ChNTs) were synthesized by the hydrothermal method. Synthetic ChNTs were characterized using XRD, SEM, TEM and N2adsorption-desorption. Adsorption technique was applied for removal of Sr (II) and Nd (III) from aqueous solution by using ChNTs. The process had been investigated as a function of pH and temperature. The experimental data were analyzed using equilibrium isotherm models. The adsorption isotherms are fitted well by Langmuir model, having a maximum adsorption capacities of 102.56 mg·g-1for Sr (II) and 47.44 mg·g-1for Nd (III) at 298 ± 1 K. FTIR

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Bhadusha, N., and T. Ananthabaskaran. "Adsorptive Removal of Methylene Blue onto ZnCl2Activated Carbon from Wood Apple Outer Shell: Kinetics and Equilibrium Studies." E-Journal of Chemistry 8, no. 4 (2011): 1696–707. http://dx.doi.org/10.1155/2011/429831.

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Methylene blue dye removal from aqueous solution was investigated using ZnCl2activated carbon prepared from wood apple outer shell (Limonia acidissima, biomass waste). Influence of agitation time, adsorbent dose, dye concentration, pH and temperature were explored. Two theoretical adsorption isotherms namely Langmuir and Freundlich were used to describe the experimental results. The Langmuir adsorption capacity (Qo) was found to be 35.1 mg/g and the equilibrium parameter (RL) values indicate favourable adsorption. The experimental data were well fitted with Langmuir isotherm model and pseudo s

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