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Kinetics of hexavalent chromium removal from water by chitosan-Fe0 nanoparticles.
Chemosphere. 2009 May; 75(6):825-30.C

Abstract

Chitosan-Fe(0) nanoparticles (chitosan-Fe(0)) were prepared using nontoxic and biodegradable chitosan as a stabilizer. Batch experiments were conducted to evaluate the influences of initial Cr(VI) concentration and other factors on Cr(VI) reduction on the surface of the chitosan-Fe(0). The overall disappearance of Cr(VI) may include both physical adsorption of Cr(VI) onto the chitosan-Fe(0) surface and subsequent reduction of Cr(VI) to Cr(III). The rate of reduction of Cr(VI) to Cr(III) can be expressed by a pseudo-first-order reaction kinetics. The rate constants increase with the increase in temperature and iron loading but decrease with the increase in initial Cr(VI) concentration and pH. The apparent activation energy is found to be 33 kJ mol(-1), which is characteristic of a chemically controlled reaction. Characterization with high-resolution X-ray photoelectron spectroscopy reveals that after the reaction, relative to Cr(VI) and Fe(0), Cr(III) and Fe(III) are the predominant species on the surface of chitosan-Fe(0). Chitosan has also been found to inhibit the formation of Fe(III)-Cr(III) precipitation due to its high efficiency in chelating the Fe(III) ions. This study demonstrates that chitosan-Fe(0) has the potential to become an effective agent for in situ subsurface environment remediation.

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Authors+Show Affiliations

Geng B
Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, PR China.
Jin Z
No affiliation info available
Li T
No affiliation info available
Qi X
No affiliation info available

MeSH

ChitosanChromiumKineticsNanoparticlesWater Pollutants, ChemicalWater Purification

Pub Type(s)

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

Language

eng

PubMed ID

19217139

Citation

Geng, Bing, et al. "Kinetics of Hexavalent Chromium Removal From Water By chitosan-Fe0 Nanoparticles." Chemosphere, vol. 75, no. 6, 2009, pp. 825-30.
Geng B, Jin Z, Li T, et al. Kinetics of hexavalent chromium removal from water by chitosan-Fe0 nanoparticles. Chemosphere. 2009;75(6):825-30.
Geng, B., Jin, Z., Li, T., & Qi, X. (2009). Kinetics of hexavalent chromium removal from water by chitosan-Fe0 nanoparticles. Chemosphere, 75(6), 825-30. https://doi.org/10.1016/j.chemosphere.2009.01.009
Geng B, et al. Kinetics of Hexavalent Chromium Removal From Water By chitosan-Fe0 Nanoparticles. Chemosphere. 2009;75(6):825-30. PubMed PMID: 19217139.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Kinetics of hexavalent chromium removal from water by chitosan-Fe0 nanoparticles. AU - Geng,Bing, AU - Jin,Zhaohui, AU - Li,Tielong, AU - Qi,Xinhua, Y1 - 2009/02/12/ PY - 2008/10/06/received PY - 2008/12/31/revised PY - 2009/01/05/accepted PY - 2009/2/17/entrez PY - 2009/2/17/pubmed PY - 2009/6/6/medline SP - 825 EP - 30 JF - Chemosphere JO - Chemosphere VL - 75 IS - 6 N2 - Chitosan-Fe(0) nanoparticles (chitosan-Fe(0)) were prepared using nontoxic and biodegradable chitosan as a stabilizer. Batch experiments were conducted to evaluate the influences of initial Cr(VI) concentration and other factors on Cr(VI) reduction on the surface of the chitosan-Fe(0). The overall disappearance of Cr(VI) may include both physical adsorption of Cr(VI) onto the chitosan-Fe(0) surface and subsequent reduction of Cr(VI) to Cr(III). The rate of reduction of Cr(VI) to Cr(III) can be expressed by a pseudo-first-order reaction kinetics. The rate constants increase with the increase in temperature and iron loading but decrease with the increase in initial Cr(VI) concentration and pH. The apparent activation energy is found to be 33 kJ mol(-1), which is characteristic of a chemically controlled reaction. Characterization with high-resolution X-ray photoelectron spectroscopy reveals that after the reaction, relative to Cr(VI) and Fe(0), Cr(III) and Fe(III) are the predominant species on the surface of chitosan-Fe(0). Chitosan has also been found to inhibit the formation of Fe(III)-Cr(III) precipitation due to its high efficiency in chelating the Fe(III) ions. This study demonstrates that chitosan-Fe(0) has the potential to become an effective agent for in situ subsurface environment remediation. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/19217139/Kinetics_of_hexavalent_chromium_removal_from_water_by_chitosan_Fe0_nanoparticles_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(09)00015-0 DB - PRIME DP - Unbound Medicine ER -