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采用溶胶-凝胶法将ZnO掺杂进荧光粉/TiO_2体系,并以活性炭纤维(ACF)为载体,制备了Pr~(3+)∶Y_2SiO_5/ZnO-TiO_2/ACF复合材料。采用XRD、SEM、EDS、FS和UV-vis DRS,对材料的结构及性能进行了表征,并以亚甲基蓝为模拟降解物,考察了ZnO掺杂量对复合材料可见光催化性能的影响。结果表明,当ZnO掺杂质量为TiO_2质量的10%时,制得的复合材料光催化性能最强,在500 mL质量浓度为15 mg/L的亚甲基蓝溶液中反应12 h后亚甲基蓝去除率高达98.0%,反应符合拟一级动力学方程,反应速率常数为0.341 3 h~(-1),是未掺杂ZnO的Pr~(3+)∶Y_2SiO_5/TiO_2/ACF的1.75倍,复合材料重复使用4次后亚甲基蓝去除率仍然保持在85%以上。
ZnO was doped into the phosphor / TiO 2 system by sol-gel method. Pr 3+: Y 2 SiO 5 / ZnO-TiO 2 / ACF composite was prepared by using activated carbon fiber (ACF) as carrier. The structure and properties of the composites were characterized by XRD, SEM, EDS, FS and UV-vis DRS. The effect of ZnO doping on the photocatalytic performance of the composites was investigated with methylene blue as a simulated degradation product. The results showed that the photocatalytic activity of the composites was the strongest when the ZnO doping amount was 10% of TiO 2. The removal rate of methylene blue was as high as 98.0 after reacting for 12 h in 500 mL of methylene blue solution of 15 mg / L %, And the reaction accorded with the first-order kinetic equation. The reaction rate constant was 0.341 3 h -1, which was 1.75 times of that of undoped ZnO: Y 2 SiO 5 / TiO 2 / ACF. The composite material was reused After 4 times methylene blue removal rate remained above 85%.