ZnO纳米复合材料的高分子网络凝胶法合成与光催化性能研究  

Synthesis and photocatalytic properties of ZnO nanocomposites by polymer network gel method

作　　者：黎健鸿 徐明[1,2] LI Jian-hong;XU Ming(School of Electronic and Information,Southwest Minzu University,Chengdu 610041,China;Key Laboratory of Information Materals of Sichuan Province,Southwest Minzu University,Chengdu 610041,China)

机构地区：[1]西南民族大学电子信息学院,四川成都610041 [2]西南民族大学信息材料四川省高校重点实验室,四川成都610041

出　　处：《西南民族大学学报（自然科学版）》2023年第2期149-155,共7页Journal of Southwest Minzu University(Natural Science Edition)

基　　金：西南民族大学创新型研究生项目(ZD2022240)。

摘　　要：采用简易的高分子网络凝胶法首先制备了微量Ag掺杂的ZnO,进而分别复合CuO、Mn_(2)O_(3)和Ag,得到了Zn(Ag)O-CuO、Zn(Ag)O-Mn_(2)O_(3)和Zn(Ag)O-Ag纳米复合材料.X射线衍射(XRD)测试表明氧化物或Ag的复合使ZnO的结晶性变差;扫描电镜(SEM)观察到氧化物(CuO、Mn_(2)O_(3))的复合使ZnO颗粒尺寸变大,而Ag的复合则使颗粒变小且更均匀;X射线光电子能谱(XPS)揭示氧化物(CuO、Mn_(2)O_(3))的复合引入更多的氧空位缺陷,而Ag的复合则晶格氧更多;表面光电压(SPV)光谱证实Zn(Ag)O-Ag比Zn(Ag)O-CuO、Zn(Ag)O-Mn_(2)O_(3)的光生载流子分离能力更强.在模拟太阳光照射下,Zn(Ag)O-Ag对亚甲基蓝降光催化解速率最高,归因于较小的颗粒尺寸与良好ZnO-Ag异质结的形成.虽然CuO和Mn_(2)O_(3)复合能改善ZnO的可见光吸收能力,但其较大的颗粒和较差的光生载流子分离能力使光催化性能提高不明显.The Zn(Ag)O⁃CuO,Zn(Ag)O⁃Mn_(2)O_(3)and Zn(Ag)O⁃Ag nanocomposites were synthesized by first preparing trace amounts of Ag doped ZnO using a simple polymer network gel method and then compositing CuO,Mn_(2)O_(3)and Ag,respectively.SEM observed that the composite of oxides(CuO,Mn_(2)O_(3))enlarged the ZnO particles in size,whereas the Ag composite made the particles smaller and more homogeneous;X⁃ray photoelectron spectroscopy(XPS)showed that the composite of oxides(CuO,Mn_(2)O_(3))introduced more oxygen vacancy defects,whereas the Ag composite caused more lattice oxygen;surface photo⁃voltage(SPV)spectroscopy revealed that Zn(Ag)O⁃Ag had better crystalline than Zn(Ag)O⁃CuO and Zn(Ag)O⁃Mn_(2)O_(3),and hence the stronger photogenerated carrier separation.Under simulated solar irradiation,Zn(Ag)O⁃Ag showed the highest rate of photocatalytic degradation on methylene blue,which was attributed to the smaller particle size and the formation of good ZnO⁃Ag heterojunctions.Although the composite of CuO or Mn_(2)O_(3)improved the visible light absorption of ZnO,its larger particle size and lower photogenerated carrier separation were not beneficial to the improvement in photocatalytic performance.

关 键 词：AG掺杂 CuO复合 Mn_(2)O_(3)复合 Ag复合 ZnO光催化 

分 类 号：TB383[一般工业技术—材料科学与工程] X703[环境科学与工程—环境工程] O644.1[理学—物理化学]