State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
J Environ Sci (China). 2010;22(11):1800-6. doi: 10.1016/s1001-0742(09)60322-3.
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.
一种高效的 ZrO(x)/ZnO 催化剂，通过十六烷基三甲基溴化铵辅助水热法制备，用于微波辅助光催化 (MW/PC) 降解内分泌干扰物邻苯二甲酸二甲酯 (DMP)。ZrO(x)/ZnO 采用 XPS、XRD、UV-Vis、BET 和 SEM 技术进行了表征。XPS 结果表明，ZrO(x)/ZnO 中存在不同价态 (+2、+3、+4) 的 Zr 氧化物。使用 ZrO(x)/ZnO（0.1 g），在 30 min 的反应后，DMP（100 mL，浓度为 50 mg/L）的 TOC 去除效率达到 88%，比 P25 TiO2 高约 15%。结果表明，在所有情况下，DMP 的去除过程均遵循 MW/PC 中的拟一级动力学，ZrO(x)/ZnO 显著加速了 DMP 的降解。与 P25 TiO2 相比，DMP 的降解半衰期缩短了 45%。基于微波响应和界面电荷转移，提出了一种可能的催化机制。ZrO(x)/ZnO 可以重复使用六次，而催化活性没有明显下降。该研究为设计用于 MW/PC 工艺的高效催化剂提供了新的见解，适用于 MW/PC 环境修复。
