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采用离子交换法在粉煤灰微珠(FMS)表面沉积Ag@AgCl纳米颗粒,制备Ag@AgCl-FMS复合基底,采用水解-沉淀工艺,以TiCl4为钛源在复合基底表面再包覆纳米TiO2薄膜,经500℃煅烧2h后得到Ag@AgCl-FMS-TiO2复合光催化剂.对材料微观形貌、晶体结构、可见光光催化性能进行了表征与测试.结果表明,复合基底表面包覆的TiO2薄膜均匀完整.500℃煅烧后的物相为90%锐钛矿型TiO2和10%金红石型TiO2.复合催化剂料在Ag@AgCl等离子共振效应的作用下,表现出明显的可见光响应,经可见光照射80min后对甲基橙的降解率达99%,5次重复使用对甲基橙的降解率保持在85%.
Ag @ AgCl-FMS nanocomposites were deposited on the surface of fly ash microbead (FMS) by ion exchange method to prepare Ag @ AgCl-FMS composite substrate. The surface of the composite substrate was covered with TiCl4 The photocatalyst Ag @ AgCl-FMS-TiO2 was calcined at 500 ℃ for 2h, and its microstructure, crystal structure and visible light photocatalytic activity were characterized and tested.The results showed that the TiO2 film coated on the composite substrate Uniform and complete.The phase after calcination at 500 ℃ was 90% anatase TiO2 and 10% rutile TiO2.The composite catalyst showed obvious visible light response under Ag @ AgCl plasma resonance effect, visible light irradiation for 80min After the degradation of methyl orange 99%, 5 times the degradation of methyl orange degradation rate remained at 85%.