TiO2/凹凸棒土复合催化剂的制备及光催化降解染料废水的研究
采用江苏盱眙的凹凸棒土，经酸改性，然后负载TiO2，制备复合催化剂，研究其光降解甲基橙染料废水的效果。探讨TiO2/凹凸棒土复合催化剂的投加量、光照时间、煅烧温度、甲基橙初始浓度、光照强度等因素对甲基橙降解效率的影响。87235
选取凹凸棒土与TiO2的质量比为1:3作为适宜的负载比例，通过单因子变量，讨论TiO2/凹凸棒土催化剂对甲基橙废水降解效果的影响。实验结果表明，当TiO2/凹凸棒土催化剂的投加量在3g/L，450℃下焙烧2h，光降解40min，光照强度为500W时，对初始浓度为30mg/L的甲基橙废水的脱色率能够达到90%以上。相同条件下，纯凹凸棒土对甲基橙的脱色率仅为15。9%。可见光的照射下，TiO2/凹凸棒土和纳米级TiO2对甲基橙的降解率分别为28。7%和19。6%，拓宽了纯TiO2的应用范围。
毕业论文关键词：凹凸棒土；TiO2；负载；光催化
Abstract With the development of society, printing and dyeing industry develop fast。 Dye wastewater bring serious pollution to the environment, and it also harm to human health。
Attapulgite was got from XuYi, JiangSu province。 Firstly, attapulgite was modified by acid, and then was loaded TiO2 to prepare composite catalyst。 The effects of light degradation of the methyl orange dye wastewater were studied。 Discussing the dosing quantity of TiO2/attapulgite composite catalyst, photocatalysis time, calcination temperature, initial concentration of methyl orange and light intensity, light degradation efficency of the methyl orange was analyzed。
Selecting the attapulgite and the TiO2 mass ratio of 1:3 as appropriate proportion, TiO2/attapulgite composite catalyst effects on degradation of methyl orange waste water were discussed through the single factor variable experiments。The experimental results show that the dosage of TiO2/attapulgite was 3g/L, remained 2h under 450℃, photodegradation time was 40min, light intensity was 500W, and the initial concentration of methyl orange was 30 mg/L, the decolorization rate of methyl orange can reach above 90%。 The same conditions, decolorization rate of pure attapulgite was only 15。9%。 Under visible light irradiation, TiO2/attapulgite and nanoscale TiO2 for the degradation of methyl orange rate were 28。7% and 19。6%, respectively, which it widen the application range of the pure TiO2。
Keywords: attapulgite; TiO2; load; photocatalysis
目 录
第一章 绪论 1
1。1 凹凸棒石粘土的概况 1
1。1。1 凹凸棒石粘土的简介 1
1。1。2 凹凸棒石粘土的改性提纯 1
1。1。3 凹凸棒土的应用 3
1。2 TiO2的简介 4
1。2。1 TiO2的性质 4
1。2。2 TiO2的应用 4
1。3 染料废水的研究现状 5
1。3。1 染料废水的来源及其危害 5
1。3。2 染料废水的处理方法 5
1。3。3 TiO2/凹凸棒土复合催化剂对染料废水的研究 6
1。4 实验目的和内容 7
1。4。1 实验目的 7
1。4。2 实验内容 7
第二章 实验材料和方法 9
2。1 实验仪器与药剂 9
2。1。1 实验仪器 9
2。1。2 实验药剂 9
2。2 甲基橙标准曲线的绘制 10
2。2。1 标准曲线的绘制 10
2。2。2 染料废水的测定方法 10
2。3 TiO2/凹凸棒石复合催化剂的制备 11
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