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Tungsten oxide and fly ash mixtures for single step wastewater treatment process

M. VISA1,* , A. DUTA1

Affiliation

  1. Transilvania University of Brasov, Centre: Product Design for Sustainable Development, Eroilor 29 Bvd. 500036 Brasov, Romania

Abstract

In most cases, various contaminants, with different chemical composition are simultaneously released into the environment. A typical example is the dye finishing industry, where residual dyes, heavy metals, surfactants are the main pollutants in wastewaters. The use of fly ash (FA) in wastewater treatment, for heavy metals and dyes immobilizations, represents a good application for solving the problems of advanced treatment and the intelligent use of this waste. For advanced removal of heavy metals and dyes we propose two concurrent, simultaneous processes, of adsorption and photocatalysis based on a mixture of catalysts and fly ash. Previous results were presented when using TiO2 as photocatalyst. This paper presents the results when using a mixture of WO3 and FA, in a one step treatment process of wastewaters containing heavy metals and dyes. The use of this combination must consider also the effect of the heavy metals on tungsten trioxide activity, along with the parallel process involving the dyes and the fly ash. Before investigating this double process, studies on the adsorption of the individual components must be performed on substrate mixtures. We report here the cadmium and methylen blue adsorption on mixtures of WO3 and flay ash collected from CET Brasov Romania. The process efficiency and kinetic is reported and correlated with the substrates characteristics. According to the results, WO3 operates similarly to TiO2, due to the similar values of the band gap energy and the band edge wavelength..

Keywords

Fly ash, WO3, Cadmium advanced removal, Wastewater treatment, Adsorption.

Submitted at: Dec. 30, 2009
Accepted at: Feb. 18, 2010

Citation

M. VISA, A. DUTA, Tungsten oxide and fly ash mixtures for single step wastewater treatment process, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 2, pp. 406-410 (2010)