Optimization of the operating conditions in a TiO₂/Fe₃O₄-SiO₂ photocatalytic reactor for the treatment of industrial wastewater containing Procion Red MX-5B

WANG Ai-jie^1,2, ZHOU Ai-juan², WANG Li-yan², LIU Min³, CHEN Zhao-bo¹

1.State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology,Harbin 150090,China;2.School of Municipal & Environmental Engineering,Harbin Institute of Technology,Harbin 150090,China;3.School of Chemistry & Chemical Engineering,Harbin Normal University,Harbin 150025,China



Abstract:

According to the design principle of the central composite experimental,the method of response surface analysis with three factors and three levels was adopted based on one factor test.A second-order quadratic equation for photocatalysis of Procion Red MX-5B was built.Response surface and contour were graphed with the decoloration rate of Procion Red MX-5B as the response value.Based on the analysis of the response surface plots and their corresponding contour plots,effects of pH value,irradiation time and catalyst loading were explored.By using this new method,the optimum decoloration condition was obtained as follows:pH value,1.3;irradiation time,49.9 min;catalyst loading,0.57 g/L.In the optimization,R-Squared and Adj R-Squared correlation coefficients for quadratic model were evaluated quite satisfactorily as 0.9310 and 0.8620,respectively.Under the optimum conditions established,the performance of 99.47% for color removal was experimentally reached.It was found that all factors considered have an important effect on the decolorization efficiency of Procion Red MX-5B.By the ANOVA analysis and model confirmation the optimal solution obtained using RSM was experimentally validated and credible with preferable instructional ability for experiments.

Key words:  TiO₂/Fe₃O₄-SiO₂ photocatalyst  response surface methodology(RSM)  optimization of decoloration condition

DOI：10.11916/j.issn.1005-9113.2011.02.001

Clc Number:X703

Fund: