Photocatalytic Degradation of Organic Dye Methyl Orange with Phosphotungstic Acid

Weiping Wang,Shuijin Yang

doi:10.4236/jwarp.2010.211116

Weiping Wang, Shuijin Yang

Open Access

https://doi.org/10.4236/jwarp.2010.211116

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Abstract

Silicotungstic acid and phosphotungstic acid were prepared and characterized by Fourier Transform Infrared Spectroscopy (FTIR) and X-ray diffraction (XRD). The results showed that the prepared catalysts possess classical Keggin structure. The factors on the degradation of methyl orange, such as the kind of catalyst, the amount of catalyst, the original concentration of dye and illumination time were investigated under metal halide lamp. The degradation of methyl orange is up to 93.6% with phosphotungstic acid at the best reaction conditions at 8.89 g/L concentration of phosphotungstic acid, 5.56 mg/L concentration of methyl orange and 80 min illumination time.

Highlights

The wastewater of textile dye draining into the river without treatment would bring out serious pollution of Water resource and threatening of ecology environment and human health
The results showed that the prepared catalysts possess classical Keggin structure
The factors on the degradation of methyl orange, such as the kind of catalyst, the amount of catalyst, the original concentration of dye and illumination time were investigated under metal halide lamp

Summary

Introduction

The wastewater of textile dye draining into the river without treatment would bring out serious pollution of Water resource and threatening of ecology environment and human health. The industrial methods for dye waste treatment include adsorption, precipitation, electrical remediation, oxidation, and biological degradation. All these ways cost much money, and/or create secondary contamination [1]. Since the discovery of photoelectrochemical splitting of water on n-type TiO2 electrodes [2], photochemistry has possessed many practical applications, such as in optoelectronic devices or in the field of industrial and environmental catalysis [3,4]. Zhu xiuhua [8,9] has studied the photocatalytic degradation of dye wastewater with phosphotungstic acid and silicotungstic acid.

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