仿酶催化剂制备及催化降解PAEs类污染物

采用超声辅助反向共沉淀法制得磁纳米Fe3O4颗粒,然后以磁纳米Fe3O4颗粒为种子采用种子乳液聚合法制得羟基功能化的磁纳米复合物微球,再以三聚氯氰为桥联剂键合氯化血红素制得仿酶催化剂。利用傅里叶变换红外光谱仪(FT-IR)、配置积分球的紫外-可见(UV-Vis)分光光度计、透射电子显微镜(TEM)、热重分析仪(TGA)和振动样品磁强计(VSM)对催化剂进行了表征。结果表明,催化剂粒径大小为10¹2 nm,粒度均一,分散性好,在300 K下具有一定顺磁性,饱和磁化强度为21.61 emu/g,磁性物质含量为52.50 wt%。催化剂在紫外光照和H2O2存在下对水中邻苯二甲酸二甲酯(DMP)有较高的氧化降解活性,且重复使用效果较好,因此对其反应机理进行了探讨。

Preparation of Mimetic Enzyme Catalyst and Its Application in the Degradation of PAES

Fe3O4 magnetic nanoparticles were prepared through the method of advanced ultrasound-assisted reverse co precipitation,then hydroxyl-functionalized magnetic nanocomposite microspheres were prepared by way of seed emulsion co-polymerization utilizing Fe3O4 magnetic nanoparticles as seeds,at last the mimetic enzyme catalyst was prepared by means of binding hemins to the above-mentioned magnetic nanocomposite microspheres using cyanuric chloride as the bridging agents.The catalyst was characterized by Fourier transform infrared spectrometer(FT-IR),UV-visible(UV-Vis) spectrophotometer with integrating sphere,transmission electron microscopy(TEM),thermo-gravimetric analysis(TGA) and vibrating sample magnetometer(VSM).Results showed that the catalyst,with an average particle size of 10~12nm,had a smooth granularity and good dispersibility and displayed some degree of paramagnetic behavior at 300 K,with the saturation magnetization and magnetic nanoparticles content being 21.61 emu/g and 52.50 wt% respectively.The catalyst,in the presence of ultraviolet light and H2O2,exhibited a high oxidative degradation activity for DMP in aqueous solution and still had a good effect after repeated use,so a possible reaction mechanism was proposed.