摘要
采用水热辅助的溶胶-凝胶法制备纳米钛酸锌(ZnTiO 3)光催化剂,以罗丹明B为目标降解物,运用动力学模型分析罗丹明B(RhB)初始浓度对降解效果的影响。通过SEM、XRD、XPS、UV-Vis DRS对ZnTiO3进行表征,并使用自由基捕获试验分析其降解机理。结果表明,ZnTiO3为纯六方相,形貌为类球形,粒径50 nm左右。在催化剂用量为1 g/L、RhB初始浓度为5 mg/L、pH值为3的条件下,光催化反应150 min后,RhB降解率为93.2%。其动力学方程为k=0.132 C0-1.253。ZnTiO 3光催化剂降解过程中,·OH、h^+、·O2^-均起到催化作用,产生·OH、h^+的量相近且多于·O2^-,说明·OH、h^+在催化反应中起主要作用。
The nano-zinc titanate(ZnTiO3)photocatalyst was prepared by hydrothermal-assisted sol-gel method.Rhodamine B was taken as the target degradant.The effect of initial concentration of Rhodamine B(RhB)on the degradation was analyzed by kinetic model.ZnTiO3 was characterized by SEM,XRD,XPS and UV-Vis DRS.The degradation mechanism was analyzed by free radical trapping experiments.The results show that ZnTiO3 is a pure hexagonal phase with a spherical shape and a particle size of about 50 nm.Under the condition of catalyst dosage of 1 g·L^-1,initial concentration of RhB of 5 mg/L and pH of 3,the degradation rate of RhB was 93.2%after photocatalytic reaction for 150 min.Its kinetic equation is k=0.132C 0-1.253.In the degradation process of ZnTiO3 photocatalyst,·OH,h+,·O2^-all play a catalytic role,and the amount of·OH and h+is similar and more than·O2^-,indicating that·OH and h+play a major role in the catalytic reaction.
作者
李俊生
徐美艳
关天宇
夏至
姜黎明
谭冲
左金龙
Li Junsheng;Xu Meiyan;Guan Tianyu;Xia Zhi;Jiang Liming;Tan Chong;Zuo Jinlong(School of Food Engineering,Harbin University of Commerce,Harbin 150076,P.R.China;Research Center of Pharmaceutical Engineering Technology,Harbin University of Commerce,Harbin 150076,P.R.China)
出处
《土木与环境工程学报（中英文）》
CSCD
北大核心
2020年第3期149-155,共7页
Journal of Civil and Environmental Engineering
基金
哈尔滨商业大学校级科研项目(17XN070)。
关键词
钛酸锌
动力学
罗丹明B
光催化降解
ZnTiO3
kinetics
Rhodamine B
photocatalytic degradation
作者简介
李俊生(1973-),男,副教授,主要从事光催化材料制备及应用研究,E-mail:shengjunli731@126.com;通信作者:左金龙,男,教授,博士,E-mail:mdjzjl@163.com。
