摘要
以Keggin型多金属氧酸盐(多酸,POMs)为光催化还原剂、稳定剂和包覆剂,在光照下一步合成AuNPs@POMs/rGO复合纳米材料。采用透射电镜(TEM)、X射线衍射(XRD)和紫外-可见吸收光谱(UV-vis)等对所制得的材料进行了结构表征和性能测试。以光催化降解甲基橙为模型反应研究了AuNPs@POMs/rGO纳米复合材料的光催化活性。透射电子镜结果显示Au纳米微粒均匀的负载在rGO薄层上,无聚集和团聚现象。实验探究了pH、温度、催化剂投放量以及甲基橙初始浓度对光催化降解过程的影响。光催化降解结果表明:当溶液处于室温,pH=8.0,催化剂投放量为0.15 g·L^-1,甲基橙溶液初始浓度为25.0 mg·L^-1时,效果达到最佳,降解率为94.5%。
AuNPs@POMs/rGO composite nanomaterials were prepared by one-step photochemical reduction using Keggin structure phosphotungstic acid(POMs)as photocatalytic reductants,stabilizers and cladding agents.The structure and properties of the prepared materials were tested by transmission electron microscopy(TEM),X-ray diffraction(XRD)and UV-visible absorption spectrum(UV-vis).The photocatalytic activity of AuNPs@POMs/rGO nanocomposites was studied by photocatalytic degradation of methyl orange.Transmission electron microscopy showed that the Au nanoparticles in the AuNPs@POMs/rGO composite nanomaterial were uniformly distributed on the reduced graphene oxide sheet.The photocatalytic degradation results showed that when the solution was at room temperature,pH=8.0,the catalyst dosage was 0.15 g·L^-1,and the initial concentration of methyl orange solution was 25.0 mg·L^-1,the effect was the best,and the degradation rate was 94.5%.
作者
陈晓丽
吴华燕
李昱苇
尹伟
张刚
霍朝晖
CHEN Xiao-li;WU Hua-yan;LI Yu-wei;YIN Wei;ZHANG Gang;HUO Zhao-hui(Department of Chemistry,Guangdong University of Education,Guangzhou 510303,China;Engineering Technology Development Center of Advanced Materials&Energy Saving and Emission Reduction in Guangdong Colleges and Universities,Guangzhou 510303,China;Shenzhen Fangrun Environmental Technology co.LTD,Shenzhen 518107,China)
出处
《化学研究与应用》
CAS
CSCD
北大核心
2020年第8期1363-1370,共8页
Chemical Research and Application
基金
广东省教育厅“创新强校工程”青年创新人才类项目(2016KQNCX112)
广东省普通高校先进材料与节能减排工程技术开发中心项目(2016GCZX007)
大学生创新创业训练项目(201914278112,201914278113)资助。
关键词
多金属氧酸盐
纳米金
还原氧化石墨烯
一步法
光催化
polyoxometallates
gold nanoparticles
reduced graphene oxide
one-step method
photocatalysis
