Environmental catalysis and materials

Treatment of phenol wastewater by microwave-induced ClO2-CuOx/Al2O3catalytic oxidation process

BI Xiao-yi , WANG Peng , JIANG Hong , XU Huan-yan , SHI Shu-jie , HUANG Jun-li


Received March 18, 2007,Revised June 25, 2007, Accepted , Available online

Volume 19,2007,Pages 1510-1515

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The catalyst of CuOx/Al2O2 was prepared by the dipping-sedimentation method using -Al2O3 as a supporter. CuO and Cu2O were loaded on the surface of Al2O3, characterized by X-ray di raction (XRD) and X-ray photoelectron spectroscopy (XPS). In the presence of CuOx/Al2O3, the microwave-induced chlorine dioxide (ClO2) catalytic oxidation process was conducted for the treatment of synthetic wastewater containing 100 mg/L phenol. The factors influencing phenol removal were investigated and the results showed that microwave-induced ClO2-CuOx/Al2O3 process could e ectively degrade contaminants in a short reaction time with a low oxidant dosage, extensive pH range. Under a given condition (ClO2 concentration 80 mg/L, microwave power 50W, contact time 5 min, catalyst dosage 50 g/L, pH 9), phenol removal percentage approached 92.24%, corresponding to 79.13% of CODCr removal. The removal of phenol by microwave-induced ClO2-CuOx/Al2O3 catalytic oxidation process was a complicated non-homogeneous solid/water reaction, which fitted pseudo-first-order by kinetics. Compared with traditional ClO2 oxidation, ClO2 catalytic oxidation and microwave-induced ClO2 oxidation, microwave-induced ClO2 catalytic oxidation system could significantly enhance the degradation e ciency. It provides an effective technology for the removal of phenol wastewater.

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