Int. J. of Nanomanufacturing   »   2014 Vol.10, No.1/2

 

 

Title: Phosphotungstic acid supported on chitosan/SiO2 composite for photocatalytic degradation of tetraazo dye direct fast black G

 

Authors: Kebin Li; Yanhui Zhang; Qinqin Wang; Hong Wei; Feng Zhao; Tao Zhang

 

Addresses:
Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, School of Chemistry and Material Science, Northwest University, Xi'an 710069, China
Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, School of Chemistry and Material Science, Northwest University, Xi'an 710069, China
Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, School of Chemistry and Material Science, Northwest University, Xi'an 710069, China
Department of Municipal and Environmental Engineering, Xi'an University of Technology, Xi'an 710048, China
Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, School of Chemistry and Material Science, Northwest University, Xi'an 710069, China
Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, School of Chemistry and Material Science, Northwest University, Xi'an 710069, China

 

Abstract: A facile process to prepare the supported phosphotungstic acid/chitosan-coated silica gel composite catalyst (PW12/CST/SiO2) was presented. SEM-EDX, UV-vis DRS, FT-IR and XRD analyses revealed that PW12 was highly dispersed on CST/SiO2 composite support's surface with the intact Keggin units. The effects of pH, dye concentration, and catalyst loading on adsorption and photodegradation of a tetraazo dye direct fast black G (DB19) by the prepared composite catalyst in the presence of electron donor (isopropanol) were investigated. The kinetics of dye adsorption and photodegradation were analysed by the zero-order kinetic model, and the corresponding rate constants were calculated. The optimal condition for the photocatalytic degradation of DB19 was also established. This study further indicates that PW12/CST/SiO2 could be used as a bifunctional material to decolourise azo dye in aqueous solutions by a combined adsorption and photocatalytic degradation process.

 

Keywords: phosphotungstic acid; dye photodegradation; azo dye; chitosan; silicon dioxide; silica gel; composites; kinetics; dye adsorption; kinetic modelling; photocatalytic degradation.

 

DOI: 10.1504/IJNM.2014.059001

 

Int. J. of Nanomanufacturing, 2014 Vol.10, No.1/2, pp.94 - 109

 

Submission date: 24 Dec 2012
Date of acceptance: 26 Mar 2013
Available online: 01 Feb 2014

 

 

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