水热法合成TiO_2/Fe^(3+)光催化剂及其氧化降解亚甲基蓝  

Hydrothermal Preparation of TiO_2/Fe^(3+) Photo-catalysts and Their Application in Oxidation Degeneration of Methylene Blue

作　　者：张一兵[1] 饶太巧 

机构地区：[1]上饶师范学院化学化工学院,江西上饶334001

出　　处：《材料科学与工程学报》2014年第3期344-348,共5页Journal of Materials Science and Engineering

基　　金：教育部第四批高等学校特色专业建设点资助项目(TS11524);江西省省级精品课程资助项目(赣教高字〔2011〕74号);江西省高校教学团队资助项目(赣教高字[2008]100号)

摘　　要：以硫酸钛为钛源,采用水热法合成了TiO2/Fe3+光催化剂,利用XRD对产物晶体结构进行表征,研究在紫外光(365nm)照射下用合成的TiO2/Fe3+粉末催化降解亚甲基蓝的效果,分析了亚甲基蓝初始浓度、TiO2/Fe3+用量、掺Fe3+量、光照时间和溶液初始pH值等因素的影响;考察了溶液初始pH值对TiO2/Fe3+粉末的吸附性能和光催化活性的影响。结果表明:合成的TiO2/Fe3+晶体为锐钛矿型(A-TiO2)。在4mg/L的亚甲基蓝溶液(pH=8)中,加入掺Fe3+量0.8%(摩尔分数)合成的TiO2/Fe3+粉末使其用量为0.6g/L,室温下紫外光照反应6h,亚甲基蓝的降解率达到98.2%。在上述优化条件下,当溶液的pH<6时,催化剂对亚甲基蓝的吸附量和光催化效率均较低,且二者随pH升高而显著增加;当pH≥6时,对亚甲基蓝的吸附作用较大,因此较明显地提高了光催化活性。TiO2/Fe3+photo-catalysts were prepared via the hydrothermal method using titanium sulfate as titanium source,and were primarily characterized by XRD technology.The oxidation degeneration of methylene blue on as-prepared TiO2/Fe3+under 365nm UV light was studied.The effects of initial concentration of methylene blue,TiO2/Fe3+dosage,the doping amount of Fe3+,illumination time and initial pH value on the degradation of methylene blue were explored.How the pH value affecting the adsorbing capability and photo-catalytic performance of the TiO2/Fe3+powders on methylene blue was discussed.Results show that the as-prepared TiO2/Fe3+photo-catalysts are anatase-type structure,the degeneration rate of methylene blue is 98.2% under the following optimizing conditions:the initial concentration of methylene blue was 4mg/L at pH=8,the TiO2/Fe3+dosage was 0.6g/L,the doping amount of Fe3 was 0.8%(molar fraction)and the illumination time was 6hunder UV light(365nm)at room temperature.In the above optimized conditions,when pH of methylene blue was lower than 6,both the adsorbing capability and photocatalytic efficiency of TiO2/Fe3+powders on methylene blue are relatively small and appreciably increase with the increase of pH value.When pH of methylene blue was equal or higher than 6,the photo-catalytic activity would increase because of more significant adsorption effect of TiO2/Fe3+.

关 键 词：亚甲基蓝 TiO2/Fe3+ 紫外光 光催化 降解 吸附 

分 类 号：X791[环境科学与工程—环境工程] TQ426[化学工程]