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采用过饱和沉淀法制备了镁铝层状双金属氢氧化物(Mg-Al-LDHs)载体,再以Ag NO3和HCl通过沉积-沉淀法制得Ag Cl/Mg-Al-LDHs,光还原后得到了可见光响应和高活性的Ag@Ag Cl/Mg-Al-LDHs等离子体共振光催化剂。采用XRD,SEM,TG-DTG,FT-IR和BET等技术对催化剂的相结构和微观形貌等进行了表征。结果表明:Mg-AlLDHs因其较大的负载表面使得负载的Ag@Ag Cl纳米粒子颗粒变小、分散程度增强,这不仅增加了复合材料的活性位点,而且提高了负载Ag@Ag Cl纳米颗粒的光生电子-空穴对的氧化-还原能力,从而使得复合材料具有比Ag@Ag Cl更高的反应活性。在可见光条件下(λ>420 nm),Ag@Ag Cl/Mg-Al-LDHs复合材料光催化降解亚甲基蓝(MB)的活性明显高于纯Ag@Ag Cl,当Ag@Ag Cl的负载量(质量分数)为16%时表现出最好的光催化活性,可见光照射10 mg/L MB溶液180 min的光解率达96.04%。
The Mg-Al-LDHs carrier was prepared by supersaturated precipitation method, AgCl / Mg-Al-LDHs was prepared by deposition-precipitation method with AgNO3 and HCl, Ag @ Ag Cl / Mg-Al-LDHs plasmon resonance photocatalyst with visible light response and high activity. The phase structure and microstructure of the catalyst were characterized by XRD, SEM, TG-DTG, FT-IR and BET. The results show that Mg-AlLDHs can reduce the size and dispersion of Ag @ Ag Cl nanoparticles due to its large surface area, which not only increases the active sites of the composites but also increases the loading of Ag @ Ag Cl nanowires The photogenerated electron-hole pairs have the oxidation-reduction ability of the particles, so that the composite material has higher reactivity than Ag @ Ag Cl. Under visible light conditions (λ> 420 nm), the photocatalytic degradation of methylene blue (MB) by Ag @ Ag Cl / Mg-Al-LDHs composites was significantly higher than that of pure Ag @ Ag Cl. Mass fraction) of 16% showed the best photocatalytic activity. The photolysis rate of visible light irradiated 10 mg / L MB solution for 180 min was 96.04%.