Effect of organic matter on cyanide removal by illuminated titanium dioxide or zinc oxide nanoparticles

Journal of Environmental Health Science Engineering

Mehdi Shirzad-Siboni²  Seung-Mok Lee³  Jae-Kyu Yang¹  Mehrdad Farrokhi² 

[1] Division of General Education, Kwangwoon University, Seoul, Korea;Department of Environmental Health Engineering, School of Health, Guilan University of Medical Sciences, Rasht, Iran;Department of Environmental Engineering, Kwandong University, Gangnung, Korea

关键词: Cyanide;    Organic compound;    Zinc oxide;    Titanium dioxide;    Nanoparticle;    Photocatalysis;   

Others  :  820562
DOI  :  10.1186/2052-336X-11-23

 received in 2012-12-05, accepted in 2013-06-26,  发布年份 2013

【 摘 要 】

Effect of different type of organic compounds (humic acid, oxalate, ethylenediaminetetraacetic acid, nitrilotriacetic acid, phenol) on the photocatalytic removal of cyanide with TiO₂ or ZnO was studied in this work with variation of the solution pH, contact time, initial cyanide concentration and type of organic compounds. Photocatalytic oxidation efficiency of cyanide with TiO₂ was greatly affected by the solution pH. It increased as the solution pH decreased. Also maximum removal of cyanide by ZnO was observed near at neutral pH because of the reduced photocatalytic activity of ZnO at exceedingly low and high pH values originated from either acidic/photochemical corrosion of the catalyst and/or surface passivation with Zn(OH)₂. Removal efficiency of cyanide greatly decreased in the presence of humic acid, ethylenediaminetetraacetic acid, nitrilotriacetic acid compared to that without presence of organic compound because of the competitive oxidation as well as surface blocking by relatively large organic compounds. The oxidation pattern of cyanide was better described by first-order kinetic model. Finally photocatalytic reaction with TiO₂ or ZnO can be effectively applied to treat synthetic wastewater contaminated with cyanide.

【 授权许可】

   
2013 Farrokhi et al.; licensee BioMed Central Ltd.

【 图 表 】

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