摘要
在温和、无模板条件下利用水热法合成了簇状钨酸铋,通过超声还原法将银纳米粒子负载在其表面,得到复合催化剂Ag/Bi_2WO_6。采用XRD、SEM、XPS、UV-vis DRS等技术对样品进行了表征与测试。选择对硝基苯酚还原生成对氨基苯酚为模型反应,探讨了Ag/Bi_2WO_6的催化活性。结果表明,Ag的负载量为5.0%的复合样品催化活性最高,17 min内可以将4-NP全部催化还原。这可能是由于Ag纳米颗粒分散在Bi_2WO_6表面,比表面积大,表面能高,反应活性强。另外,模拟太阳光下,复合样品Ag/Bi_2WO_6作催化剂,以有机染料结晶紫为污染物模型,进行了光催化反应,研究了合成样品的光催化活性。结果显示,负载量为5.0%Ag/Bi_2WO_6的光催化降解结晶紫的活性最高。本研究对设计高效复合催化剂提供了新的思路和借鉴。
Microcluster like Bi2WO6 was synthesized by hydrothermal method under mild and no template condi-tions, and the composite catalysts Ag/Bi2WO6 were obtained by loaded silver nanoparticles on the surface of Bi2WO6. The microstructure, chemical composition, and morphology of the as-synthesized samples were characterized by XRD, SEM, XPS, DRS UV-vis techniques. The reduction reaction of p-nitrophenol （4-NP） was selected as a model to study the catalytic activity of the as-synthesized samples. The results showed that the composite catalysts Ag/Bi2WO6 exhibited the higher catalytic performance than that of pure Bi2WO6. Ag content greatly impacted the catalytic activity of composite Ag/Bi2WO6. The conversion rate of 4-NP with 5% Ag/Bi2W06as catalyst could reach 100% within only 17 min, which might be attributed to more number of available active sites from the highly dispersed Ag nanoparticles on the surface of Bi2WO6 microcluster. Moreover, organic dye crystal violet as pollutant model, the photocatalytic degradation experiments were carried out under simulated solar light irradiation. The com-posite sample 5% Ag/Bi2WO6 showed the excellent photocatalytic activity. So that, the present study might provide a new strategy to design composite catalyst.
作者
宋继梅
刘晓灵
李文芳
杨捷
陈波
申岳新
许子涵
SONG Ji-mei LIU Xiao-ling LI Wen-Fang YANG Jie CHEN Bo SHENG Yue-xin XU Zi-han(School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, Anhui,China)
出处
《中国钼业》
2017年第3期23-29,共7页
China Molybdenum Industry
