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Photocatalytic reduction of Cr(VI) and Ni(II) in aqueous solution by synthesized nanoparticle ZnO under ultraviolet light irradiation: a kinetic study.
Environ Technol. 2011 Oct; 32(13-14):1573-9.ET

Abstract

Photocatalytic removal of Cr(VI) and Ni(II) from aqueous solution using synthesized nanoparticle ZnO under ultraviolet (UV) light irradiation was studied in this work. Firstly, nanoparticle ZnO was prepared by the chemical method with an organic chemical inhibitor. Then removal efficiency of Cr(VI) and Ni(II) by nanoparticle ZnO was investigated with variation of the solution pH, ZnO dosage, contact time and initial Cr(VI) and Ni(II) concentration. Maximum removal of Cr(VI) and Ni(II) was observed at near-neutral pH because the reduced photocatalytic activity of ZnO at exceedingly low and high pH values originates from either acidic/photochemical corrosion of the catalyst and/or surface passivation with Zn(OH)2. As the ZnO dosage increased, the removal efficiency of Cr(VI) and Ni(II) was continuously enhanced, but was gradually decreased above 1.25 g/l due to the increased blockage of the incident UV light used for the photocatalytic reaction. The optimum ZnO dosage was determined as 1 g/l. Removal efficiencies of Cr(VI) and Ni(II) decreased as initial Cr(VI) and Ni(II) concentration increased, due to an increased inhibition effect on the surface of ZnO resulting from the decreased reaction sites on the surface of ZnO required for the further photocatalytic reaction.

Authors+Show Affiliations

Environmental Health Research Centre, Kurdistan University of Medical Sciences, Sanandaj, Kurdistan, Iran.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

22329148

Citation

Siboni, M Shirzad, et al. "Photocatalytic Reduction of Cr(VI) and Ni(II) in Aqueous Solution By Synthesized Nanoparticle ZnO Under Ultraviolet Light Irradiation: a Kinetic Study." Environmental Technology, vol. 32, no. 13-14, 2011, pp. 1573-9.
Siboni MS, Samadi MT, Yang JK, et al. Photocatalytic reduction of Cr(VI) and Ni(II) in aqueous solution by synthesized nanoparticle ZnO under ultraviolet light irradiation: a kinetic study. Environ Technol. 2011;32(13-14):1573-9.
Siboni, M. S., Samadi, M. T., Yang, J. K., & Lee, S. M. (2011). Photocatalytic reduction of Cr(VI) and Ni(II) in aqueous solution by synthesized nanoparticle ZnO under ultraviolet light irradiation: a kinetic study. Environmental Technology, 32(13-14), 1573-9.
Siboni MS, et al. Photocatalytic Reduction of Cr(VI) and Ni(II) in Aqueous Solution By Synthesized Nanoparticle ZnO Under Ultraviolet Light Irradiation: a Kinetic Study. Environ Technol. 2011;32(13-14):1573-9. PubMed PMID: 22329148.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Photocatalytic reduction of Cr(VI) and Ni(II) in aqueous solution by synthesized nanoparticle ZnO under ultraviolet light irradiation: a kinetic study. AU - Siboni,M Shirzad, AU - Samadi,M T, AU - Yang,J K, AU - Lee,S M, PY - 2012/2/15/entrez PY - 2012/2/15/pubmed PY - 2012/3/15/medline SP - 1573 EP - 9 JF - Environmental technology JO - Environ Technol VL - 32 IS - 13-14 N2 - Photocatalytic removal of Cr(VI) and Ni(II) from aqueous solution using synthesized nanoparticle ZnO under ultraviolet (UV) light irradiation was studied in this work. Firstly, nanoparticle ZnO was prepared by the chemical method with an organic chemical inhibitor. Then removal efficiency of Cr(VI) and Ni(II) by nanoparticle ZnO was investigated with variation of the solution pH, ZnO dosage, contact time and initial Cr(VI) and Ni(II) concentration. Maximum removal of Cr(VI) and Ni(II) was observed at near-neutral pH because the reduced photocatalytic activity of ZnO at exceedingly low and high pH values originates from either acidic/photochemical corrosion of the catalyst and/or surface passivation with Zn(OH)2. As the ZnO dosage increased, the removal efficiency of Cr(VI) and Ni(II) was continuously enhanced, but was gradually decreased above 1.25 g/l due to the increased blockage of the incident UV light used for the photocatalytic reaction. The optimum ZnO dosage was determined as 1 g/l. Removal efficiencies of Cr(VI) and Ni(II) decreased as initial Cr(VI) and Ni(II) concentration increased, due to an increased inhibition effect on the surface of ZnO resulting from the decreased reaction sites on the surface of ZnO required for the further photocatalytic reaction. SN - 0959-3330 UR - https://www.unboundmedicine.com/medline/citation/22329148/Photocatalytic_reduction_of_Cr_VI__and_Ni_II__in_aqueous_solution_by_synthesized_nanoparticle_ZnO_under_ultraviolet_light_irradiation:_a_kinetic_study_ L2 - https://www.tandfonline.com/doi/full/10.1080/09593330.2010.543933 DB - PRIME DP - Unbound Medicine ER -