Solar photocatalytic removal of metal ions from industrial wastewater

Autor:	R.L. Sawhney, Rubina Chaudhary, Kavita Kabra
Rok vydání:	2008
Předmět:	Chrome plating Metal ions in aqueous solution Inorganic chemistry chemistry.chemical_element Zinc Catalysis Industrial wastewater treatment Nickel Adsorption chemistry visual_art visual_art.visual_art_medium Photocatalysis General Environmental Science
Zdroj:	Environmental Progress. 27:487-495
ISSN:	1547-5921 0278-4491
DOI:	10.1002/ep.10304
Popis:	This article describes the photocatalytic reduction and deposition of four metal ions Cr(VI), Ni(II), Zn(II), and Cu(II) present in the wastewater from a chrome plating industry using solar energy irradiated TiO2. A parabolic trough reactor was used to carry out the reaction. Experiments were carried out to find an optimum dose of hole scavenger used (citric acid). The adsorption and reduction of the metal ions at different pH values was also investigated. It was observed that the solar photocatalytic process was effective in removing most of the metal ions in specific reaction conditions. Alkaline pH was found to be more suitable for removal of nickel and zinc. However, Cr(VI) reduced completely even at catalyst concentrations as low as 0.5 mg/L at pH 2. Maximum reaction was completed in the first 4 h of solar exposure. © 2008 American Institute of Chemical Engineers Environ Prog, 2008
Databáze:	OpenAIRE
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