采用柠檬酸络合溶胶-凝胶法,以稻谷壳为模板和Si源制备SiO2-BiVO4光催化剂,结合SEM、XRD等手段对其进行表征。考察了源物质物质的量之比、烧结温度、降解时间、起始溶液浓度、催化剂用量、初始pH和反应温度等因素对光催化降解刚果红脱色率的影响。结果表明,在源物质物质的量之比为1∶1,烧结温度为450℃,染料初始浓度为30mg/L,初始pH为3.0,催化剂用量0.3g/L,光照35℃恒温反应90min时,光催化降解刚果红溶液的脱色率可达到92.82%,脱色反应动力学方程符合准一级反应。
SiO2-BiVO4 photocatalyst was prepared by citric acid complex sol-gel method,and characterized by SEM and XRD methods.The effects of source material molar ratio,sintering temperature,degradation time,initial solution concentration,catalyst dosage,initial pH and reaction temperature on the decolorization rate of Congo red were investigated.The results showed that the decolorization rate of the photocatalytic degradation of Congo red solution could reach 92.82% at the source material ratio of 1∶1,sintering temperature of 450℃,initial dye concentration of 30mg/L,initial pH of 3.0,catalyst dosage of 0.3g/L and constant temperature reaction at 35℃ for 90min.The kinetic equation of decolorization reaction accorded with pseudo first order reaction.
[1] 单斌,王安琪,魏霄飞,等.TiO2型光催化剂在染料废水处理中的应用进展[J].染料与染色,2018,55(6):55-60.
[2] Tan H L,Ma R A,Yhng L.Exploring the different roles of particle size in photoelectrochemical and photocatalytic water oxidation on BiVO4[J].ACS Applied Materials & Interfaces,2016,8(42):28607-28614.
[3] Jiang H Y,Meng X,Dai H X,et al.High-performance porous spherical or octapod-like single-crystalline BiVO4 photocatalysts for the removal of phenol and methylene blue under visible-light illumination[J].Journal of Hazardous Materials,2017(217):92-99.
[4] Obregons,Cabalero A,Colon G.Hydrothermal synthesis of BiVO4:structural and morphological influence on the photocatalytic activity[J].Applied Catalysis B-Environmental,2012.117:59-66.
[5] Hai B L,Jian Z,Guo Y H,et al.Hydrothermal synthesis and enhanced photocatalytic activity of hierarchical flower-like Fe-doped BiVO4[J].Transactions of Nonferrous Metals Society of China,2017,27(4):868-875.
[6] 周慧,杜彬,陈丽萍.三种形貌BiVO4微纳材料的制备及其光催化性能研究[J].化学研究与应用,2016,28(10):1494-1499.
[7] Benjamin O O,Omotavo A A.An exfoliated graphite-bismuth vanadate composite photoanode for the photoelectrochemical degradation of acid orange 7 dye[J].Electrocatalysis,2019,10(4):429-435.
[8] 贾瑛,张彭义.光催化及其在环境净化中的应用[M].北京:化学工业出版社,2016.
[9] 刘景景.二氧化锰/钒酸铋复合光催化剂的制备及性能[J].化学研究与应用,2019,31(4):644-651.
[10] 李杰,宋晨飞,逄显娟.可见光催化剂钒酸铋的可控合成及性能研究[J].无机材料学报,2019,34(2):164-172.
[11] 高雅男.二氧化钛-钒酸铋符合材料光催化降解布洛芬的研究[J].无机盐工业,2019,51(6):88-91.