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Montmorillonite surface properties and sorption characteristics for heavy metal removal from aqueous solutions.
J Hazard Mater. 2009 Jul 15; 166(1):538-46.JH

Abstract

Surface properties of montmorillonite (MMT) and its adsorption characteristics for heavy metals have been investigated with nickel and copper as sorbate from aqueous solutions. Employing the potentiometric and mass titration techniques in batch experimental methods, the point of zero charge (PZC) and point of zero net proton charge (PZNPC) of MMT edges at different ionic strengths present pH(PZC) and pH(PZNPC) to be 3.4+/-0.2. A crossing point was observed for the proton adsorption vs. pH curves at different ionic strengths of KCl electrolyte and in investigating MMT remediation potentialities as sorbent for heavy metals polluted waters, the effects of heavy metal concentration, pH, MMT dosage, reaction time and temperature for Cu(2+) and Ni(2+) uptake were studied. The sorption of metal ions by MMT was pH dependent and the adsorption kinetics revealed sorption rate could be well fitted by the pseudo-second-order rate model. The data according to mass transfer and intraparticle diffusion models confirmed diffusion of solutes inside the clay particles as the rate-controlling step and more important for the adsorption rate than the external mass transfer. Adsorption isotherms showed that the uptake of Cu(2+) and Ni(2+) could be described by the Langmuir model and from calculations on thermodynamic parameters, the positive Delta G degrees values at different temperatures suggest that the sorption of both metal ions were non-spontaneous. Change in enthalpy (Delta H degrees) for Ni(2+) and Cu(2+) were 28.9 and 13.27 kJ/mol K respectively, hence an endothermic diffusion process, as ion uptake increased with increase in temperature. Values of DeltaS degrees indicate low randomness at the solid/solution interface during the uptake of both Cu(2+) and Ni(2+) by MMT. Montmorillonite has a considerable potential for the removal of heavy metal cationic species from aqueous solution and wastewater.

Authors+Show Affiliations

Department of Environmental Science and Engineering, Ewha Womans University, Seoul 120-750, Republic of Korea.No affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19131158

Citation

Ijagbemi, Christianah Olakitan, et al. "Montmorillonite Surface Properties and Sorption Characteristics for Heavy Metal Removal From Aqueous Solutions." Journal of Hazardous Materials, vol. 166, no. 1, 2009, pp. 538-46.
Ijagbemi CO, Baek MH, Kim DS. Montmorillonite surface properties and sorption characteristics for heavy metal removal from aqueous solutions. J Hazard Mater. 2009;166(1):538-46.
Ijagbemi, C. O., Baek, M. H., & Kim, D. S. (2009). Montmorillonite surface properties and sorption characteristics for heavy metal removal from aqueous solutions. Journal of Hazardous Materials, 166(1), 538-46. https://doi.org/10.1016/j.jhazmat.2008.11.085
Ijagbemi CO, Baek MH, Kim DS. Montmorillonite Surface Properties and Sorption Characteristics for Heavy Metal Removal From Aqueous Solutions. J Hazard Mater. 2009 Jul 15;166(1):538-46. PubMed PMID: 19131158.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Montmorillonite surface properties and sorption characteristics for heavy metal removal from aqueous solutions. AU - Ijagbemi,Christianah Olakitan, AU - Baek,Mi-Hwa, AU - Kim,Dong-Su, Y1 - 2008/12/03/ PY - 2008/08/27/received PY - 2008/11/18/revised PY - 2008/11/18/accepted PY - 2009/1/10/entrez PY - 2009/1/10/pubmed PY - 2009/8/8/medline SP - 538 EP - 46 JF - Journal of hazardous materials JO - J Hazard Mater VL - 166 IS - 1 N2 - Surface properties of montmorillonite (MMT) and its adsorption characteristics for heavy metals have been investigated with nickel and copper as sorbate from aqueous solutions. Employing the potentiometric and mass titration techniques in batch experimental methods, the point of zero charge (PZC) and point of zero net proton charge (PZNPC) of MMT edges at different ionic strengths present pH(PZC) and pH(PZNPC) to be 3.4+/-0.2. A crossing point was observed for the proton adsorption vs. pH curves at different ionic strengths of KCl electrolyte and in investigating MMT remediation potentialities as sorbent for heavy metals polluted waters, the effects of heavy metal concentration, pH, MMT dosage, reaction time and temperature for Cu(2+) and Ni(2+) uptake were studied. The sorption of metal ions by MMT was pH dependent and the adsorption kinetics revealed sorption rate could be well fitted by the pseudo-second-order rate model. The data according to mass transfer and intraparticle diffusion models confirmed diffusion of solutes inside the clay particles as the rate-controlling step and more important for the adsorption rate than the external mass transfer. Adsorption isotherms showed that the uptake of Cu(2+) and Ni(2+) could be described by the Langmuir model and from calculations on thermodynamic parameters, the positive Delta G degrees values at different temperatures suggest that the sorption of both metal ions were non-spontaneous. Change in enthalpy (Delta H degrees) for Ni(2+) and Cu(2+) were 28.9 and 13.27 kJ/mol K respectively, hence an endothermic diffusion process, as ion uptake increased with increase in temperature. Values of DeltaS degrees indicate low randomness at the solid/solution interface during the uptake of both Cu(2+) and Ni(2+) by MMT. Montmorillonite has a considerable potential for the removal of heavy metal cationic species from aqueous solution and wastewater. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/19131158/Montmorillonite_surface_properties_and_sorption_characteristics_for_heavy_metal_removal_from_aqueous_solutions_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(08)01746-9 DB - PRIME DP - Unbound Medicine ER -