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Sheikh-Mohseni MH, Sedaghat S, Derakhshi P, Safekordi A. Green bio-synthesis of Ni/montmorillonite nanocomposite using extract of Allium jesdianum as the nano-catalyst for electrocatalytic oxidation of methanol. Chin J Chem Eng 2020. [DOI: 10.1016/j.cjche.2020.04.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Ang MBMY, Deang ABG, Aquino RR, Basilia BA, Huang SH, Lee KR, Lai JY. Assessing the Performance of Thin-Film Nanofiltration Membranes with Embedded Montmorillonites. MEMBRANES 2020; 10:E79. [PMID: 32357447 PMCID: PMC7281585 DOI: 10.3390/membranes10050079] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 04/20/2020] [Accepted: 04/21/2020] [Indexed: 11/17/2022]
Abstract
In this study, the basal spacing of montmorillonite (MMT) was modified through ion exchange. Two kinds of MMT were used: sodium-modified MMT (Na-MMT) and organo-modified MMT (O-MMT). These two particles were incorporated separately into the thin-film nanocomposite polyamide membrane through the interfacial polymerization of piperazine and trimesoyl chloride in n-hexane. The membrane with O-MMT (TFNO-MMT) has a more hydrophilic surface compared to that of membrane with Na-MMT (TFNNa-MMT). When various types of MMT were dispersed in the n-hexane solution with trimesoyl chloride (TMC), O-MMT was well-dispersed than Na-MMT. The poor dispersion of Na-MMT in n-hexane led to the aggregation of Na-MMT on the surface of TFNNa-MMT. TFNO-MMT displayed a uniform distribution of O-MMT on the surface, because O-MMT was well-dispersed in n-hexane. In comparison with the pristine and TFNNa-MMT membranes, TFNO-MMT delivered the highest pure water flux of 53.15 ± 3.30 L∙m-2∙h-1 at 6 bar, while its salt rejection for divalent ions remained at 95%-99%. Furthermore, it had stable performance in wide operating condition, and it exhibited a magnificent antifouling property. Therefore, a suitable type of MMT could lead to high separation efficiency.
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Affiliation(s)
- Micah Belle Marie Yap Ang
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan
| | - Amira Beatriz Gaces Deang
- School of Chemical, Biological, and Materials Engineering and Sciences, Mapúa University, Manila 1002, Philippines
| | - Ruth R. Aquino
- School of Chemical, Biological, and Materials Engineering and Sciences, Mapúa University, Manila 1002, Philippines
| | - Blessie A. Basilia
- School of Chemical, Biological, and Materials Engineering and Sciences, Mapúa University, Manila 1002, Philippines
- Industrial Technology Development Institute, Department of Science and Technology, DOST Compound, Taguig City 1631, Philippines
| | - Shu-Hsien Huang
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan
- Department of Chemical and Materials Engineering, National Ilan University, Yilan 26047, Taiwan
| | - Kueir-Rarn Lee
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan
| | - Juin-Yih Lai
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan
- Applied Research Center for Thin-Film Metallic Glass, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
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Dong L, Linghu W, Zhao D, Mou Y, Hu B, Asiri AM, Alamry KA, Xu D, Wang J. Performance of biochar derived from rice straw for removal of Ni(II) in batch experiments. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2018; 2017:824-834. [PMID: 30016300 DOI: 10.2166/wst.2018.238] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Biochar, as a cost-efficient adsorbent, is of major interest in the removal of heavy metals from wastewater. Herein, batch experiments were conducted to investigate the performance of biochar derived from rice straw for the removal of Ni(II) as a function of various environmental conditions. The results showed that Ni(II) sorption was strongly dependent on pH but independent of ionic strength and the effects of electrolyte ions could be negligible over the whole pH range. Ionic exchange and inner-sphere surface complexation dominated the sorption of Ni(II). Humic/fulvic acids clearly enhanced the Ni(II) sorption at pH <7.2 but inhibited the sorption at pH >7.2. The sorption reached equilibrium within 10 hours, and the kinetics followed a pseudo-second-order rate model. Any of the Langmuir, Freundlich, or Dubinin-Radushkevich isotherm models could describe the sorption well, but the Langmuir model described it best. The maximum sorption capacity calculated from the Langmuir model was 0.257 m·mol/g. The thermodynamic parameters suggested that Ni(II) sorption was a spontaneous and endothermic process and was enhanced at high temperature. The results of this work indicate that biochar derived from rice straw may be a valuable bio-sorbent for Ni(II) in aqueous solutions, but it still requires further modification.
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Affiliation(s)
- Lijia Dong
- School of Life Sciences, Shaoxing University, Huancheng West Road 508, Shaoxing, Zhejiang 312000, China E-mail:
| | - Wensheng Linghu
- School of Chemistry and Chemical Engineering, Shaoxing University, Huancheng West Road 508, Shaoxing, Zhejiang 312000, China
| | - Donglin Zhao
- School of Materials and Chemical Engineering, Anhui University of Architecture, Hefei 230601, China
| | - Yinyan Mou
- School of Life Sciences, Shaoxing University, Huancheng West Road 508, Shaoxing, Zhejiang 312000, China E-mail:
| | - Baowei Hu
- School of Life Sciences, Shaoxing University, Huancheng West Road 508, Shaoxing, Zhejiang 312000, China E-mail:
| | - Abdullah M Asiri
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Khalid A Alamry
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Di Xu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, China
| | - Jin Wang
- College of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
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Tournassat C, Davis JA, Chiaberge C, Grangeon S, Bourg IC. Modeling the Acid-Base Properties of Montmorillonite Edge Surfaces. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:13436-13445. [PMID: 27993078 DOI: 10.1021/acs.est.6b04677] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The surface reactivity of clay minerals remains challenging to characterize because of a duality of adsorption surfaces and mechanisms that does not exist in the case of simple oxide surfaces: edge surfaces of clay minerals have a variable proton surface charge arising from hydroxyl functional groups, whereas basal surfaces have a permanent negative charge arising from isomorphic substitutions. Hence, the relationship between surface charge and surface potential on edge surfaces cannot be described using the Gouy-Chapman relation, because of a spillover of negative electrostatic potential from the basal surface onto the edge surface. While surface complexation models can be modified to account for these features, a predictive fit of experimental data was not possible until recently, because of uncertainty regarding the densities and intrinsic pKa values of edge functional groups. Here, we reexamine this problem in light of new knowledge on intrinsic pKa values obtained over the past decade using ab initio molecular dynamics simulations, and we propose a new formalism to describe edge functional groups. Our simulation results yield reasonable predictions of the best available experimental acid-base titration data.
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Affiliation(s)
- Christophe Tournassat
- UMR 7327 Institut des Sciences de la Terre d'Orléans, Université d'Orléans-CNRS/INSU-BRGM , 45071 Orléans, France
- Earth and Environmental Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
- BRGM, French Geological Survey, 45100 Orléans, France
| | - James A Davis
- Earth and Environmental Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
| | | | | | - Ian C Bourg
- Department of Civil and Environmental Engineering and Princeton Environmental Institute, Princeton University , Princeton, New Jersey 08544, United States
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Chen Z, Chen L, Lu S. Effect of solution chemistry on the interaction of radionuclide 63Ni(II) onto montmorillonite. J Radioanal Nucl Chem 2015. [DOI: 10.1007/s10967-015-4482-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Yu S, Mei H, Chen X, Tan X, Ahmad B, Alsaedi A, Hayat T, Wang X. Impact of environmental conditions on the sorption behavior of radionuclide 90 Sr(II) on Na-montmorillonite. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2014.12.041] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Tan X, Ren X, Chen C, Wang X. Analytical approaches to the speciation of lanthanides at solid-water interfaces. Trends Analyt Chem 2014. [DOI: 10.1016/j.trac.2014.06.010] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Effect of environmental parameters on the sequestration of radionickel by Mg2Al layered double hydroxide. J Radioanal Nucl Chem 2013. [DOI: 10.1007/s10967-013-2498-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Effect of pH, ionic strength, foreign ions and temperatures on the sorption of Eu(III) on attapulgite-iron oxide magnetic composites. J Radioanal Nucl Chem 2013. [DOI: 10.1007/s10967-013-2480-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Removal of U(VI) from aqueous solutions by using attapulgite/iron oxide magnetic nanocomposites. J Radioanal Nucl Chem 2012. [DOI: 10.1007/s10967-012-2360-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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99TcO4 − diffusion and sorption in compacted GMZ bentonite studied by capillary method. J Radioanal Nucl Chem 2012. [DOI: 10.1007/s10967-012-2329-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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12
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Wang X. Interaction of radionickel with diatomite as a function of pH, ionic strength and temperature. J Radioanal Nucl Chem 2012. [DOI: 10.1007/s10967-012-2295-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13
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Sorption of 63Ni(II) to montmorillonite as a function of pH, ionic strength, foreign ions and humic substances. J Radioanal Nucl Chem 2012. [DOI: 10.1007/s10967-012-2253-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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14
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Interaction of U(VI) with Na-attapulgite in the presence and absence of humic acid as a function of pH, ionic strength and temperature. J Radioanal Nucl Chem 2012. [DOI: 10.1007/s10967-012-2265-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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15
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Li K, Hu J, Liu Z, Chen L, Dong Y. Sorption of radiocobalt(II) onto MWCNTs: effects of solid content, contact time, pH, ionic strength, humic acid and temperature. J Radioanal Nucl Chem 2012. [DOI: 10.1007/s10967-012-2222-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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16
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Sorption of Th(IV) from aqueous solution to GMZ bentonite: effect of pH, ionic strength, fulvic acid and electrolyte ions. J Radioanal Nucl Chem 2012. [DOI: 10.1007/s10967-012-1991-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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17
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Chen L, Yu S, Huang L, Wang G. Impact of environmental conditions on the removal of Ni(II) from aqueous solution to bentonite/iron oxide magnetic composites. J Radioanal Nucl Chem 2012. [DOI: 10.1007/s10967-012-1687-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Zhao D, Wang X, Yang S, Guo Z, Sheng G. Impact of water quality parameters on the sorption of U(VI) onto hematite. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2012; 103:20-29. [PMID: 22036154 DOI: 10.1016/j.jenvrad.2011.08.010] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Revised: 07/31/2011] [Accepted: 08/15/2011] [Indexed: 05/31/2023]
Abstract
In this study, the sorption of U(VI) from aqueous solution on hematite was studied as a function of various water quality parameters such as contact time, pH, ionic strength, soil humic acid (HA) or fulvic acid (FA), solid content and temperature by using a batch technique. The results demonstrated that the sorption of U(VI) was strongly dependent on ionic strength at pH<6.0, and outer-sphere surface complexation may be the main sorption mechanism. The sorption was independent of ionic strength at pH>6.0 and the sorption was mainly dominated by inner-sphere surface complexation. The presence of HA/FA increases U(VI) sorption at low pH, whereas decreases U(VI) sorption at high pH. The thermodynamic parameters (ΔH⁰, ΔS⁰, and ΔG⁰) were calculated from the temperature dependent sorption isotherms, and the results suggested that U(VI) sorption was a spontaneous and endothermic process. The results might be important for the application of hematite in U(VI) pollution management.
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Affiliation(s)
- Donglin Zhao
- School of Materials and Chemical Engineering, Anhui University of Architecture, Hefei 230601, PR China
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Hu T, Tan L. Modifying attapulgite clay by ammonium citrate tribasic for the removal of radionuclide Th(IV) from aqueous solution. J Radioanal Nucl Chem 2011. [DOI: 10.1007/s10967-011-1522-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Sorption of radiocobalt(II) onto Ca-montmorillonite: effect of contact time, solid content, pH, ionic strength and temperature. J Radioanal Nucl Chem 2011. [DOI: 10.1007/s10967-011-1400-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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21
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Hu T, Tan L. Sorption/desorption of radionickel on/from Na-montmorillonite: kinetic and thermodynamic studies. J Radioanal Nucl Chem 2011. [DOI: 10.1007/s10967-011-1377-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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22
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23
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Impact of environmental conditions on the sorption behavior of radiocobalt onto montmorillonite. J Radioanal Nucl Chem 2011. [DOI: 10.1007/s10967-011-1219-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Chen L, Huang Y, Huang L, Liu B, Wang G, Yu S. Characterization of Co(II) removal from aqueous solution using bentonite/iron oxide magnetic composites. J Radioanal Nucl Chem 2011. [DOI: 10.1007/s10967-011-1337-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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25
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Sorption of uranium(VI) on Na-attapulgite as a function of contact time, solid content, pH, ionic strength, temperature and humic acid. J Radioanal Nucl Chem 2011. [DOI: 10.1007/s10967-011-1129-4] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Impact of environmental conditions on the sorption behavior of radiocobalt in TiO2/eggshell suspensions. J Radioanal Nucl Chem 2011. [DOI: 10.1007/s10967-011-1088-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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28
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Dong Y, Liu Z, Li Y. Effect of pH, ionic strength, foreign ions and humic substances on Th(IV) sorption to GMZ bentonite studied by batch experiments. J Radioanal Nucl Chem 2011. [DOI: 10.1007/s10967-011-1072-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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29
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Guo Z, Zhao D, Li Y, Chen Z, Niu H, Xu J. Solution chemistry effects on sorption behavior of 109Cd(II) on Ca-montmorillonite. J Radioanal Nucl Chem 2011. [DOI: 10.1007/s10967-011-0998-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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30
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Chen L, Gao B, Lu S, Dong Y. Sorption study of radionickel on attapulgite as a function of pH, ionic strength and temperature. J Radioanal Nucl Chem 2011. [DOI: 10.1007/s10967-011-1006-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Tan X, Hu J, Montavon G, Wang X. Sorption Speciation of Nickel(ii) onto Ca-Montmorillonite: Batch, EXAFS Techniques and Modeling. Dalton Trans 2011; 40:10953-60. [DOI: 10.1039/c1dt10740b] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zhang H, Yu X, Chen L, Jing Y, Ge Z. Study of ⁶³Ni adsorption on NKF-6 zeolite. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2010; 101:1061-1069. [PMID: 20869794 DOI: 10.1016/j.jenvrad.2010.08.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2010] [Revised: 08/24/2010] [Accepted: 08/26/2010] [Indexed: 05/29/2023]
Abstract
The adsorption of ⁶³Ni from aqueous solutions using NKF-6 zeolite was investigated by a batch technique under ambient conditions. The adsorption was investigated as a function of contact time, pH, ionic strength, foreign ions, humic substances (FA/HA) and temperature. The kinetic adsorption was well described by the pseudo-second-order rate equation. The adsorption of ⁶³Ni on NKF-6 zeolite was strongly dependent on pH and ionic strength, and the adsorption of ⁶³Ni increased with increasing NKF-6 zeolite content. At low pH values, the presence of FA enhanced the adsorption of ⁶³Ni on NKF-6 zeolite, but the presence of HA had no drastic effect. At high pH values, the presence of FA or HA decreased the adsorption of ⁶³Ni on NKF-6 zeolite. The adsorption isotherms were well represented by the Langmuir model. The thermodynamic parameters (i.e., ΔH(0), ΔS(0)and ΔG(0)) for the adsorption of ⁶³Ni were determined from the temperature dependent isotherms at 293.15, 313.15 and 333.15 °K, respectively, and the results indicate that the adsorption reaction was favored at high temperature. The results suggest that the adsorption process of ⁶³Ni on NKF-6 zeolite is spontaneous and endothermic.
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Affiliation(s)
- Hui Zhang
- School of Chemical Engineering, Shandong University of Technology, Zibo, PR China
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Yang S, Zhao D, Zhang H, Lu S, Chen L, Yu X. Impact of environmental conditions on the sorption behavior of Pb(II) in Na-bentonite suspensions. JOURNAL OF HAZARDOUS MATERIALS 2010; 183:632-640. [PMID: 20728269 DOI: 10.1016/j.jhazmat.2010.07.072] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2010] [Revised: 07/16/2010] [Accepted: 07/16/2010] [Indexed: 05/27/2023]
Abstract
In this study, a local bentonite from Lin'an county (Zhejiang province, China) was converted to Na-purified form and the Na-bentonite sample was characterized by using FTIR and XRD to determine its chemical constituents and micro-structure. The removal of lead from wastewaters by Na-bentonite was studied as a function of various environmental parameters such as contact time, pH, ionic strength, foreign ions, humic substances and temperature under ambient conditions. The results indicated that the sorption of Pb(II) on Na-bentonite was strongly dependent on pH and ionic strength. The Langmuir, Freundlich and D-R models were used to simulate the sorption isotherms of Pb(II) at three different temperatures of 298, 318 and 338 K. The thermodynamic parameters (ΔH°, ΔS° and ΔG°) calculated from the temperature dependent sorption isotherms indicated that the sorption process of Pb(II) on Na-bentonite was endothermic and spontaneous. At low pH, the sorption of Pb(II) was dominated by outer-sphere surface complexation and ion exchange with Na(+)/H(+) on Na-bentonite surfaces, whereas inner-sphere surface complexation was the main sorption mechanism at high pH. From the experimental results, it is possible to conclude that Na-bentonite has good potentialities for cost-effective disposal of lead bearing wastewaters.
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Affiliation(s)
- Shitong Yang
- Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, PR China.
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Zhang S, Guo Z, Xu J, Niu H, Chen Z, Xu J. Effect of environmental conditions on the sorption of radiocobalt from aqueous solution to treated eggshell as biosorbent. J Radioanal Nucl Chem 2010. [DOI: 10.1007/s10967-010-0895-8] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Yang S, Li J, Lu Y, Chen Y, Wang X. Sorption of Ni(II) on GMZ bentonite: Effects of pH, ionic strength, foreign ions, humic acid and temperature. Appl Radiat Isot 2009; 67:1600-8. [DOI: 10.1016/j.apradiso.2009.03.118] [Citation(s) in RCA: 184] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2008] [Revised: 01/19/2009] [Accepted: 03/10/2009] [Indexed: 11/25/2022]
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Effect of pH, ionic strength and temperature on the sorption of radionickel on Na-montmorillonite. Appl Radiat Isot 2009; 67:1007-12. [DOI: 10.1016/j.apradiso.2009.02.085] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2008] [Revised: 02/16/2009] [Accepted: 02/19/2009] [Indexed: 11/22/2022]
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