Co3O4/TiO2纳米材料的制备及其光催化性能  

Fabrication and Photocatalytic Performance of Co3O4/TiO2 Nanomaterials

作　　者：崔丹凤[1] 李渊凯 范燕云 常柳 陈奕 薛晨阳[1] Cui Danfeng;Li Yuankai;Fan Yanyun;Chang Liu;Chen Yi;Xue Chenyang(Key Laboratory of Instrumentation Science&Dynamic Measurement of Ministry of Education,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学仪器科学与动态测试教育部重点实验室,大原030051

出　　处：《微纳电子技术》2020年第10期776-781,共6页Micronanoelectronic Technology

基　　金：国家杰出青年科学基金资助项目(61525107);山西省青年科学基金资助项目(201801D221197)。

摘　　要：以硝酸钴为前驱体、钛酸正丁酯为钛源,结合碳辅助溶胶-凝胶法制备Co3O4/TiO2异质结构纳米材料,并研究了产物对亚甲基蓝(MB)的光催化降解性能。氮吸附-脱附测试结果表明,颗粒平均粒径约为28 nm,比表面积为51.05 m^2·g^-1。合成的介孔Co3O4/TiO2复合纳米颗粒显示出在太阳光下对MB良好的脱色和降解率,90 min后初始浓度为10 mg/L的MB降解效率可以达到95%,且在回收5个周期后回收率仍然可以达到85%。这主要是由于碳辅助法制备Co3O4纳米材料表面的残留碳使其在可见光区域有更强的吸收性能,且吸收范围更宽。另一方面,通过提高Co3O4/TiO2比表面积和缺陷密度,抑制表面光生载流子的复合,也提高了产物的光催化降解效果。结果表明,利用碳辅助溶胶-凝胶法可以合成形貌一致、分散性好、洁净度高的Co3O4/TiO2异质结构纳米材料,且其具有广阔的发展前景,特别是在水净化、环境治理和光解水制氢等方面。Combined with carbon-assisted sol-gel method,Co3O4/TiO2 heterostructure nanomaterials were prepared by using cobalt nitrate as precursor and n-butyl titanate as titanium source.And the photocatalytic degradation performance of the products to methylene blue(MB)was studied.The results of nitrogen adsorption-desorption test results show that the average grain diameter of the particles is about 28 nm and the specific surface area of the particles is 51.05 m^2·g^-1.The synthesized mesoporous Co3O4/TiO2 composite nanoparticles show a good decolorization and degradation rate of the MB under sunlight.After 90 min,the degradation efficiency of the MB with the initial concentration of 10 mg/L can reach 95%,and the recovery rate can still reach 85%after 5 cycles of recovery.This is mainly caused by the residual carbon on the surface of the Co3 O4 prepared by the carbon-assisted method makes its absorption performance in the visible region better and the absorption range wider.On the other hand,by improving the specific surface area and defect density of the Co3O4/TiO2,the composite of surface photogenic carriers can be inhibited,thereby improving the photocatalytic degradation effect of the products.The results show that the Co3O4/TiO2 heterostructure nanomaterials with uniform morphology,good dispersion and high cleanliness can be synthesized by the carbon-assisted sol-gel method,and have a broad development prospect,especially in water purification,environmental treatment,photocatalytic splitting of water into hydrogen and other aspects.

关 键 词：Co3O4/TiO2 复合纳米材料 光催化 亚甲基蓝(MB) 碳辅助 

分 类 号：TB383[一般工业技术—材料科学与工程]