Fe-TiO_(2)/Nd-ZnO物理掺混光催化降解水中培氟沙星的研究

Photocatalytic degradation of pefloxacin in water by physically blended Fe-TiO_(2)/Nd-ZnO

为了降解水中抗生素污染物培氟沙星,采用溶胶-凝胶法制备了5%Fe-TiO_(2)和0.7%Nd-ZnO光催化剂,以物理方式掺混探究了钛锌摩尔比对培氟沙星降解率的影响,利用XRD、UV-Vis、SEM和BET等手段对样品进行表征,并对合成的光催化剂进行培氟沙星的光降解实验研究。结果表明,当培氟沙星质量浓度为20 mg/L、反应时间为3 h、钛锌摩尔比为0.7、催化剂质量浓度为0.55 g/L、p H为6时,培氟沙星降解率高达98.96%。此时,Fe-TiO_(2)/Nd-ZnO的晶型发生改变,带隙宽度为3.12 e V,比表面积为39 m2/g。

To degrade pefloxacin in water,5%Fe-TiO_(2) and 0.7%Nd-ZnO photocatalysts are prepared by sol-gel method,the effect of different molar ratios of titanium to zinc on the degradation rate of pefloxacin is explored through physically blending two kinds of photocatalysts.The blended catalyst samples are characterized by XRD,UV-Vis,SEM and BET,and the photodegradation of pefloxacin over those is studied experimentally.Results show that the degradation rate of pefloxacin reaches as high as 98.96%when the concentration of pefloxacin is 20 mg·L-1,the reaction lasts for3 h,the molar ratio of titanium to zinc is 0.7,the adding amount of catalyst is 0.55 g·L-1,and p H equals to 6.Meanwhile,Fe-TiO_(2)/Nd-ZnO has a changed crystal form,a band gap width of 3.12 e V,and a specific surface area of39 m2·g-1.