以自制的Fe3O4@SiO2@TiO2为载体,甲基对硫磷(MP)为模板分子,甲基丙烯酸(MAA)和4-乙烯基吡啶(4-VP)为功能单体,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,采用表面分子印迹法制备了磁性分子印迹复合光催化剂TiO2-MPIPs,并对其进行表征和光催化特性研究。结果表明:当n(MP)∶n(MAA+4-VP)∶n(EGDMA)为1∶8∶18,乙烯基改性Fe3O4@SiO2@TiO2用量为33mg时,光催化性能达到最佳。TiO2-MPIPs对模板分子MP具有良好的特异性识别和光催化降解作用,45min内快速达到吸附平衡,最大吸附容量为44.5mg/g,紫外光照射70min,对MP的降解率达到96.8%;与乐果相比,TiO2-MPIPs对MP的光催化降解选择性系数为2.73,是磁性非分子印迹复合光催化剂TiO2-NIPs或未改性Fe3O4@SiO2@TiO2选择性系数的3.10倍、2.55倍。
By using Fe3O4@SiO2@TiO2 as the carrier,methyl parathion(MP)as the template molecule,methacrylic acid(MAA) and 4-vinylpyridine(4-VP) as the functional monomer,and ethyleneglycol dimethacrylate(EGDMA) as the crosslinking agent,the magnetic molecularly imprinted composite photocatalyst(TiO2-MPIPs) was prepared by surface polymerization method,and studied its characterization and photocatalytic properties.The results shown that when the ratio of n(MP)∶n(MAA+4-VP)∶n(EGDMA) was 1∶8∶18,and the amount of Fe3O4@SiO2@TiO2 modified by ethylene was 33mg,the photocatalytic performance was the best.TiO2-MPIPs had good specific recognition and photocatalytic degradation of the template molecule MP and quickly reached the adsorption equilibrium within 45 minutes with the maximum adsorption capacity at 44.5mg/g and the degradation rate of MP at 96.8% after 70 minutes' UV irradiation.TiO2-MPIPs selectivity coefficient of photocatalytic degradation for MP was 2.73 as compared to that with dimethoate,3.10 times and 2.55 times that of the magnetic non molecularly imprinted composite photocatalyst (TiO2-NIPs) and the carrier (Fe3O4@SiO2@TiO2) respectively.
[1] 何娟, 张宗祥, 丁金美.土壤中有机磷农药的测定及光催化降解的研究[J].四川环境, 2014, 33(4):58-61.
[2] 赵军, 王焕伟, 孙墨杰, 等.水热法制备CuS二氧化钛纳米管复合电极及光催化有机磷[J].硅酸盐通报, 2014, 33(9):2398-2401.
[3] 方红新, 刘善和, 张涛, 等.有机磷生产废水处理方法的研究[J].安徽化工, 2016, 42(2):65-67.
[4] 屈文慧, 周晨冬, 王颜红, 等.克百威分子印迹聚合物合成方法的优化[J].沈阳药科大学学报, 2019, 36(3):229-234.
[5] 何莉娜, 陈芳艳, 唐玉斌.分子印迹型TiO2的制备及其对邻苯二甲酸二(2-乙基)己酯的光催化性能[J].环境工程学报, 2017, 11(6):3532-3538.
[6] 张阳, 安娅, 魏声培, 等.罗丹明B表面分子印迹N-TiO2的制备及其在可见光下的选择性光催化研究[J].化工新型材料, 2018, 46(6):194-198.
[7] 李鸿, 朱宝林, 郑修成, 等.包覆型磁性二氧化钛的制备及其光催化性能的研究[J].分子催化, 2006, 20(5):429-434.
[8] Song X, Gao L.Fabrication of bifunctional titania/silica-coated magnetic spheres and their photocatalytic activities[J].Journal of the American Ceramic Society, 2007, 90(12):4015-4019.
[9] Naeem K, Ouyang F.Preparation of Fe3+-doped TiO2 nanoparticles and its photocatalytic activity under UV light[J].Physica B Condensed Matter, 2010, 405(1):221-226.
[10] Buddee S, Wongnawa S, Sirimahachai U, et al.Recyclable UV and visible light photocatalytically active amorphous TiO2 doped with M(Ⅲ) ions (M=Cr and Fe)[J].Materials Chemistry and Physics, 2011, 126(1):167-177.
[11] 焦琳娟, 李永豪, 吴晓莹.Fe3+掺杂Fe3O4@SiO2@TiO2型光催化剂的制备及其光催化性能[J].化学研究与应用, 2018, 30(9):1416-1422.
[12] Xu Shiying, Guo Changjuan, Li Yongxian, et al.Methyl parathion imprinted polymer nanoshell coated on the magnetic nanocore for selective recognition and fast adsorption and separation in soils[J].Journal of Hazardous Materials, 2013, 12(264):34-41.
