title: Efficient microwave-assisted photocatalytic degradation of endocrine disruptor dimethyl phthalate over composite catalyst ZrO(x)/ZnO.
abstract: A highly active ZrO(x)/ZnO catalyst for microwave-assisted photocatalytic (MW/PC) degradation of endocrine disruptor dimethyl phthalate (DMP) has been prepared via cetyltrimethylammonium assisted hydrothermal method. The ZrO(x)/ZnO was characterized by XPS, XRD, UV-Vis, BET and SEM techniques. The XPS result showed that Zr oxides with different valences (+2, +3, +4) co-existed in ZrO(x)/ZnO. By using the ZrO(x)/ZnO (0.1 g), the TOC removal efficiency of DMP (100 mL of 50 mg/L) was 88% after 30 min reaction, which was about 15% higher than P25 TiO2. It was found that the removal process of DMP by MW/PC followed pseudo first-order kinetics in all cases, and ZrO(x)/ZnO significantly accelerated the degradation of DMP. The degradation half-life time of DMP was shortened 45% compared with P25 TiO2. A possible catalytic mechanism was proposed based on microwave response and interfacial charge transfer. ZrO(x)/ZnO could be reused for six times without obvious decrease in catalytic activity. The study offers new insights into designing highly efficient catalysts for MW/PC process and is applicable for MW/PC environmental remediation.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. liaowenchao@gmail.com
authors.forename: Wenchao
authors.initials: W
authors.lastname: Liao
authors.forename: Tong
authors.initials: T
authors.lastname: Zheng
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.forename: Sisi
authors.initials: S
authors.lastname: Tu
authors.forename: Weiqian
authors.initials: W
authors.lastname: Pan
mesh_terms: D052244:Endocrine Disruptors / Q000737:chemistry*; D008872:Microwaves; D010777:Photochemistry; D010795:Phthalic Acids / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D052244:Endocrine Disruptors; D010795:Phthalic Acids; C024629:dimethyl phthalate; D015034:Zinc Oxide