摘要
采用共沉淀法制备一系列CuO-TiO_2复合氧化物催化剂,采用XRD、UV-vis、TG-DTA以及BET比表面积分析等进行表征,并测试其可见光降解甲基橙的性能.结果表明:前体是以水滑石、Cu(OH)_2、TiO_2、CuO等物相存在的混合物相,焙烧后的复合氧化物呈现CuO和TiO_2物相为主,在可见光区有较强的光响应.适宜Cu/Ti比的CuO-TiO_2复合氧化物可见光下对甲基橙具有良好的降解性能,在催化剂质量浓度为1.5g/L时,甲基橙初始质量浓度为0.4 mg/L,光照20 min降解率可达100%,光降解过程符合1级动力学.
A series of CuO-TiO_2mixedoxides were synthesized by coprecipitation and were characterized by XRD,UV-vis diffuse reflectance,TG-DTA,BET specific surface area measurement.The results indicated that the precursor wascomposed of mixed phases likehydrotalcite,Cu(OH)_2,TiO_2,CuO.The mixed oxides obtained by calcination were mainly composed of CuO and TiO_2 and had a strong response in the visible light.CuO-TiO_2 mixed oxide with a suitable ratio of Cu/Tipresented a good degradation performance for methyl orange.When the initial concentration of methyl orange was 0.4 mg/L and the catalyst dosage was 1.5 g/L,the methyl orange degradation rate reached up to 100%after visible-light irradiation of 20 min.The process of the photodegradation was in accordance with the characteristic of the first order reaction.
出处
《沈阳化工大学学报》
CAS
2017年第2期124-128,133,共6页
Journal of Shenyang University of Chemical Technology
基金
辽宁省教育厅科技项目(L2014169)
关键词
复合金属氧化物
甲基橙
光催化
动力学
mixed metal oxides
methyl orange
photocatalysis
kinetics
