摘要
采用共沉积法合成不同配比的Fe_2O_3/α-MoO_3复合光催化剂,利用X射线衍射(XRD)、扫描电子显微镜(SEM)及紫外-可见漫反射光谱(UV-Vis DRS)等技术分析其晶体结构、形貌及其光学性能,以铜绿微囊藻(Microcystis aeruginosa,MA)为污染物模型,通过检测叶绿素a、丙二醛、可溶性蛋白含量的变化,研究该催化剂在可见光(λ≥420nm)照射下催化降解MA的性能。结果表明:当Fe_2O_3质量为α-MoO_3质量的1.0%时,复合催化剂1.0%Fe_2O_3/α-MoO_3对MA的催化降解效率最佳;pH 7.5条件下,1.0%Fe_2O_3/α-MoO_3用量为0.4g/L时,可见光照射5h后MA的去除率达96%,藻细胞溶出的可溶性蛋白量最低;1.0%Fe_2O_3/α-MoO_3在可见光照射下除藻过程中产生的丙二醛产量较避光反应时明显增多。将1.0%Fe_2O_3/α-MoO_3负载到泡沫镍后,表现出良好的稳定性和循环利用性,对实际水体中的混合藻类达到90%以上的降解率。
Fe2O3/α-MoO3 composite photocatalysts with different ratios were synthesized by co-deposition method.Their crystal structure,morphology and optical performance were analyzed by means of X-ray diffraction(XRD),scanning electron microscopy(SEM)and ultraviolet visible diffuse reflectance spectroscopy(UV-Vis DRS),etc.Microcystis aeruginosa(MA)was used as the model pollutant to study the catalytic degradation of MA under visible light irradiation(λ≥420nm)by detecting the changes of chlorophyll a,malondialdehyde and soluble protein content.The results show that the removal efficiency of MA is the highest with the mass ratio of Fe2O3toα-MoO3 at 1∶100(1.0%);At pH =7.5,when the dosage of 1.0% Fe2O3/a-MoO3 is 0.4g/L,the removal rate of MA reaches 96%after 5hours of visible light irradiation,and the soluble protein content of algae cells is the lowest.The malondialde-hyde production of 1.0% Fe2O3/α-MoO3 during algae removal under visible light irradiation is significantly higher than that during dark reaction.When Fe2O3/α-MoO3 is loaded onto foam nickel,it shows good stability and recycling efficiency,and the degradation rate of mixed algae in water sample is more than 90%.
作者
黄应平
付桂荣
吴斌
方艳芬
HUANG Yingping;FU Guirong;WU Bin;FANG Yanfen(College of Biological and Pharmaceutical,China Three Gorges University,Yichang 443002,Hubei,China;Collaborative Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area,Hubei Province,China Three Gorges University,Yichang 443002,Hubei,China;Engineering Research Center of Eco-Environment in Three Gorges Reservoir Region,Ministry of Education,China Three Gorges University,Yichang 443002,Hubei,China)
出处
《武汉大学学报（理学版）》
CAS
CSCD
北大核心
2019年第1期49-56,共8页
Journal of Wuhan University:Natural Science Edition
基金
国家自然科学基金(21577078
21677086)
湖北省自然科学基金创新群体项目(2105CFA021)
