复合光催化材料对食品色素废水的降解研究  

PHOTOCATALYTIC DEGRADATION OF FOOD PIGMENT WASTEWATER BY COMPOSITE PHOTOCATALYST

作　　者：李宗慧[1] 李道荣[1] 张洋 李盼[1] 

机构地区：[1]河南工业大学化学化工学院,河南郑州450001

出　　处：《河南工业大学学报（自然科学版）》2014年第2期89-92,共4页Journal of Henan University of Technology：Natural Science Edition

摘　　要：以自制纳米TiO2为主体，以高铝酸盐为载体制备复合光催化材料，以甲基橙色素溶液为试验底物，优化材料的组成比例、光照条件、污染物初始浓度、溶液pH值等条件，在最优条件下考察对常用食品色素胭脂红、日落黄、柠檬黄的降解效果．结果表明：高铝酸盐与纳米TiO2按8：2成膜制备的复合材料光催化降解甲基橙效果最好；初始浓度越低，光催化效果越好；吸附作用促进了光催化降解，光催化120min时甲基橙的最大吸收波长464nm处吸收峰消失，在270nm处的特征峰也消失，这表明甲基橙已发生完全降解；溶液pH为6～8时降解效率较高；胭脂红、日落黄、柠檬黄在120min时的降解效率分别达到88．1％、95．6％、97．1％，光催化处理食品色素废水的效果显著．A composite photocatalyst was prepared by using self-made TiO2 as main body and perhafnate as support. The preparation conditions, such as material ratios, light conditions, pollutant initial concentration, pH value, were optimized by using methyl orange pigment solution as substrate. The degradation effects of the composite photocatalyst on common food pigments, such as carmine, sunset yellow and lemon yellow, were studied under the optimum conditions. The results showed that the composite photocatalyst prepared from perhafnate and nano TiO2 at a ratio of 8 to 2 had the best effect in degrading methyl orange; lower initial concentration resulted in better photocatalytic effect; the absorption effect accelerated the photocatalytic degradation. The absorption peak of methyl orange disappeared at the maximum absorption wave-length 464 nm after photocatalysis 120 minutes, and characteristic peak at 270 nm also disappeared, which showed that methyl orange was degraded completely. Higher degradation effect was obtained when the pH value was between 6 and 8. The degradation rates of carmine, sunset yellow and lemon yellow were 88.1%, 95.6% and 97.1% after degradation for 120 minutes. The result indicated that the photocatalytic treatment had remarkable effect in processing wastewater.

关 键 词：纳米TiO2-高铝酸盐复合材料 甲基橙 食品色素 光催化降解 

分 类 号：X703.1[环境科学与工程—环境工程]