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.
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