Abstract
A novel microwave-assisted photocatalytic active ZrOx catalyst, which has mix-valences and wide bandgap, has been prepared by cetyltrimethylammonium bromide–assisted hydrothermal method. Structural and optical properties were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, N2 adsorption–desorption, and UV–vis techniques. Total organic carbon (TOC) removal of dimethyl phthalate (DMP) (100 mL, 50 mg L−1) with 1 g L−1 ZrOx approached 84% after a 30-min reaction, which was about 15% and 11% higher than ZrO2 and P25 TiO2, respectively. TOC removal of DMP by microwave-assisted photocatalytic process followed pseudo–first-order kinetics in all cases, and ZrOx evidently accelerated the degradation of DMP. Degradation half-life time of DMP using ZrOx was shortened 43% and 34%, compared with ZrO2 and P25 TiO2, respectively. A possible catalytic mechanism of ZrOx was proposed based on microwave response and interfacial charge transfer analyses. Further research on ZrOx may develop a promising new generation of highly efficient catalysts for the microwave-assisted photocatalytic process for environmental remediation.
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