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Preparation of adsorptive nanoporous membrane using powder activated carbon: Isotherm and thermodynamic

Majid Peyravi

Frontiers of Chemical Science and Engineering 2020, Volume 14, Issue 4, Pages 673-687 doi: 10.1007/s11705-019-1800-9

Abstract: experimental leachate adsorption data were analyzed by Langmuir, Freundlich, and Dubinin- Radushkevich isotherm

Keywords： amine functionality nanoporous membrane adsorption isotherm thermodynamic parameters landfill leachate

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Contributions of adsorption, bioreduction and desorption to uranium immobilization by extracellular polymeric substances

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 9, doi: 10.1007/s11783-023-1707-z

Abstract:

● EPS immobilizes U(VI) via adsorption, bioreduction and desorption.

Keywords： Adsorption Bioreduction Desorption Kinetics Isotherm Uranium

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Immobilized

Pei MA, Dan ZHANG

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 4, Pages 498-508 doi: 10.1007/s11783-012-0429-4

Abstract: To investigate the potential use of ( ) residue for Cd adsorption, poly alcohol Na alginate (PVA) was applied to immobilize it. The parameters including contact time, pH, adsorbent dosages, and coexisting metal ions were studied. The suitable pH for immobilized was 4–7 wider than that for raw (pH 6–7). In the presence of Pb concentration varying from 0 to 30 mg·L , the Cd adsorption ratios declined by 6.71% and 47.45% for immobilized and raw , respectively. While, with the coexisting ion Cu concentration varied from 0 to 30 mg·L , the Cd adsorption ratios declined by 12.97% and 50.56% for immobilized and raw , respectively. The Cd adsorption isotherms in single–metal and dual-metal solutions were analyzed by using Langmuir, Freundlich, and Dubinin–Radushkevich models. The Cd adsorption capacities ( ) in single-metal solution were 6.448 mg·L and 2.832 mg·L for immobilized and raw , respectively. The of immobilized were 1.850 mg Cd·g in Cd + Pb solution and 3.961 mg Cd·g in Cd + Cu solution, respectively. The Cd adsorption processes subjected to both adsorbents follow pseudo-second-order model. Mechanism study showed the functional group of was –OH, –NH, –CO, and PVA played an important role in metal adsorbing. Mining wastewater treatment test showed that PVA–SA-immobilized was effective in mixed pollutant treatment even for wastewater containing metal ions in very low concentration.

Keywords： immobilization Lentinus edodes residue competitive adsorption isotherm

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The prediction of adsorption isotherms of ester vapors on hypercrosslinked polymeric adsorbent

Liuyan WU,Lijuan JIA,Xiaohan LIU,Chao LONG

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 3, Pages 482-490 doi: 10.1007/s11783-015-0826-6

Abstract: Adsorption isotherms of methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate and ethyl propionate on hypercrosslinked polymeric resin (ND-100) were measured at 303K, 318K and 333K,respectively, and well fitted by Dubinin–Astakhov (DA) equation. The plots of the adsorbed volume ( ) versus the adsorption potential ( ) at three different temperatures all fell basically onto one single curve for every ester. A predicted model based on DA equation was obtained on the basis of adsorption equilibrium data of methyl acetate, ethyl acetate and ethyl propionate at 318K. The model equation successfully predicted the adsorption isotherms of methyl acetate, ethyl acetate and ethyl propionate on ND-100 at 303K, and 333K, and also gave accurate predictive results for adsorption isotherms of the other two ester compounds (propyl acetate and isopropyl acetate) on ND-100 at 303K, 318K and 333K. The results proved the effectiveness of DA model for predicting the adsorption isotherms of ester compounds onto ND-100. In addition, the relationship between physico-chemical properties of adsorbates and their adsorption properties was also investigated. The results showed that molecular weight, molar volume and molar polarizability had good linear correlations with the parameter (which represents adsorption characteristic energy) of DA equation.

Keywords： hypercrosslinked polymeric adsorbent adsorption isotherm ester prediction

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Facile synthesis of α-MnO

Weixin ZHANG, Wenran ZHAO, Zaoyuan ZHOU, Zeheng YANG

Frontiers of Chemical Science and Engineering 2014, Volume 8, Issue 1, Pages 64-72 doi: 10.1007/s11705-014-1402-5

Abstract: experimental data were analyzed by Langmuir and Freundlich models, and equilibrium data fitted the Langmuir isotherm

Keywords： MnO₂ Congo red adsorption kinetics isotherm thermodynamics

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Preparation and characterization of

Chunhua XU, Dandan CHENG, Baoyu GAO, Zhilei YIN, Qinyan YUE, Xian ZHAO

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 4, Pages 455-462 doi: 10.1007/s11783-010-0275-1

Abstract: To study the adsorption isotherm, two equilibrium models, the Langmuir and Freundlich isotherms, wereAt 293K, 303K and 313K, the adsorption capacities obtained from the Langmuir isotherm were 0.060, 0.070

Keywords： β-FeOOH-coated sand Cr(VI) adsorption isotherm kinetics

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Removal of copper by modified chitosan adsorptive membrane

Xiaoshuai LIU, Zihong CHENG, Wei MA

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 1, Pages 102-106 doi: 10.1007/s11705-009-0123-7

Abstract: Compared with the Langmuir isotherm model, the experimental data were found to be following the Freundlich

Keywords： chitosan adsorptive membrane copper removal environmental engineering heavy metal isotherm model

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Recovery of NH

Yang ZHANG,Zifu LI,Ibrahim B MAHMOOD

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 6, Pages 825-834 doi: 10.1007/s11783-014-0682-9

Abstract: The Freundlich isotherm model fitted the adsorption process better than the Langmuir and Dubinin–Radushkevichisotherm models.

Keywords： corn cob biochar isotherm model kinetic model

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Selective removal of phenol by spherical particles of

Qingchuan CHEN, Yicun WEN, Yu CANG, Li LI, Xuhong GUO, Rui ZHANG

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 2, Pages 162-169 doi: 10.1007/s11705-013-1318-5

Abstract: Spherical particles of -, - and -cyclodextrin (CD) polymers to efficiently remove phenol from waste water were prepared by reverse suspension polymerization with epichlorohydrin as crosslinker in liquid paraffin. By controlling the amounts of crosslinker and water, well-defined spherical polymer particles with controllable size were obtained. Due to the selective inclusion associations between CD groups and phenol, these CD spherical polymer particles were demonstrated to be ideal candidates for removal of phenol. Among them -CD polymer particles showed the best performance. The kinetics and isothermal equilibrium models were used to fit the experimental data of phenol removal from aqueous solution using these CD polymer particles. It was found that the kinetics followed the Ho and Mckay equation, suggesting that the adsorption process of phenol was controlled by diffusion and the host-guest interaction between CD and phenol. Equilibrium isothermal data can be well fitted by the Freundlich equation. The negative free energy change indicated the spontaneous nature of adsorption of phenol by -, - and -CD spherical polymer particles, while the lowest free energy for -CD polymer reflected its best adsorption ability, compared to - and -CD polymer particles.

Keywords： cyclodextrin polymer particles phenol kinetic models adsorption isotherm equilibrium models

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Performance and mechanism for cadmium and lead adsorption from water and soil by corn straw biochar

Tong Chi,Jiane Zuo,Fenglin Liu

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 2, doi: 10.1007/s11783-017-0921-y

Abstract: Corn straw biochar prepared under 400 °C was the best Cd and Pb adsorption capacity Maximum adsorption capacity of Cd and Pb were 43.48 and 22.73 mg·g , respectively The dominant mechanism of Cd and Pb adsorption was precipitation Biochar could reduce the bioavailability of heavy metals when mixed with soil Cadmium (Cd) and lead (Pb) in water and soil could be adsorbed by biochar produced from corn straw. Biochar pyrolyzed under 400°C for 2 h could reach the ideal removal efficiencies (99.24% and 98.62% for Cd and Pb, respectively) from water with the biochar dosage of 20 g·L and initial concentration of 20 mg·L . The pH value of 4–7 was the optimal range for adsorption reaction. The adsorption mechanism was discussed on the basis of a range of characterizations, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and Raman analysis; it was concluded as surface complexation with active sorption sites (-OH, -COO-), coordination with π electrons (C= C, C= O) and precipitation with inorganic anions (OH , CO , SO ) for both Cd and Pb. The sorption isotherms fit Langmuir model rather than Freundlich model, and the saturated sorption capacities for Cd and Pb were 38.91 mg·g and 28.99 mg·g , respectively. When mixed with soil, biochar could effectively increase alkalinity and reduce bioavailability of heavy metals. Thus, biochar derived from corn straw would be a green material for both removal of heavy metals and amelioration of soil.

Keywords： Corn straw Biochar Heavy metals Sorption isotherm Bioavailability

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Fabrication, characterization and evaluation of mesoporous activated carbons from agricultural waste: Jerusalem artichoke stalk as an example

Lei YU,Chen TU,Yongming LUO

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 2, Pages 206-215 doi: 10.1007/s11783-014-0631-7

Abstract: The as-prepared JAS-MACs were characterized by thermogravimetric, nitrogen gas adsorption isotherm and

Keywords： mesoporous activated carbon response surface methodology adsorption isotherm agricultural wastes

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Effect of textural property of coconut shell-based activated carbon on desorption activation energy of benzothiophene

YU Moxin, LI Zhong, XI Hongxia, XIA Qibin, WANG Shuwen

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 3, Pages 269-275 doi: 10.1007/s11705-008-0056-6

Abstract: The Freundlich adsorption isotherm model can be properly used to formulate the adsorption behavior of

Keywords： diameter adsorption isotherm ASAP SY-19 > activated

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Adsorption of 1,3-propanediol from synthetic mixture using polymeric resin as adsorbents

W. LUERRUK, A. SHOTIPRUK, V. TANTAYAKOM, P. PRASITCHOKE, C. MUANGNAPOH

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 1, Pages 52-57 doi: 10.1007/s11705-009-0087-7

Abstract: The adsorption isotherms were closely predicted by the Langmuir-Freundlich model among the two isotherm

Keywords： adsorption 1 3-propanediol glycerol polymeric resin adsorption isotherm

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Optimization, Kinetics, and Equilibrium Studies on the Removal of Lead(II) from an Aqueous Solution Using Banana Pseudostem as an Adsorbent Article

Shridhar S. Bagali, Bychapur S. Gowrishankar, Aashis S. Roy

Engineering 2017, Volume 3, Issue 3, Pages 409-415 doi: 10.1016/J.ENG.2017.03.024

Abstract: The experimental data were analyzed using isotherm and kinetic models.The adsorption of lead(II) onto banana pseudostem powder was fitted using the Langmuir adsorption isotherm

Keywords： Banana pseudostem Lead Isotherm Adsorption Response surface methodology