摘要：以凹凸棒黏土(Att)为基体，通过溶胶-凝胶浸渍工艺，将一系列不同比例的SnO2-TiO2 (mAtt/m(SnO2-TiO2) = 1; r = nSn/(nSn + nTi)=1, 1/5, 1/6, 1/7, 1/8, 1/9, 1/10, 1/11 , 0 )复合氧化物负载于凹凸棒土表面，制备凹凸棒黏土复合型光触媒剂(Att-SnO2-TiO2)。采用XRD、BET、TEM等分析技术对产物进行了表征。研究结果表明，SnO2-TiO2复合氧化物均匀地负载于凹凸棒土表面；经过复合氧化物负载改性后，凹凸棒土的表面形貌得到明显改善，产物的负载效果好、比表面大。以光触媒降解对硝基苯胺为对象，研究了凹凸棒土复合光触媒的光催化性能。结果表明，凹凸棒土复合光触媒显示出优异的光催化性能，其光催化活性顺序为Att-SnO2-TiO2>Att-TiO2>Att-SnO2>Att；而且比例对凹土复合光触媒剂的性能有明显的影响：在紫外光条件下，当r = 1/8时，Att-SnO2-TiO2显示出优异的光催化性能，90min内对30mg/L对硝基苯胺的降解率达99.8%。且实验证实Att-SnO2-TiO2复合光触媒剂的重复利用率也相当高，在五次回收后对30mg/L对硝基苯胺的降解率达98.7%。54130

毕业论文关键词：凹凸棒，光触媒，溶胶-凝胶浸渍，Att-SnO2-TiO2，对硝基苯胺

Abstract: Photocatalytic removal of Nitroaniline under ultraviolet radiation has been studied using attapulgite (Att) composites, which were synthesized by depositing SnO2-TiO2 hybrid oxides on the surface of Att to form a composite photocatalyst (denoted Att-SnO2-TiO2) using sol-gel dipping process. The obtained products were marked as Att-SnO2-TiO2 and were characterized by X-Ray diffraction (XRD), BET surface area and Transmission electron microscope (TEM) methods. Results showed that Att-SnO2-TiO2 nanocomposite particles with high dispersibility were successfully loaded onto the surface of Att fibers. Correspondingly, the photocatalytic activity of Att was improved significantly by loading Att-SnO2-TiO2.The photoactivity of the composite photocatalyst decreased in the sequence Att -SnO2-TiO2>Att-TiO2>Att- SnO2>Att. In order to achieve the best photocatalyst, Att is always the total quality 50%, but the molar ratio of SnO2 and TiO2 in the Att-SnO2-TiO2 composites was adjusted to give a series proportions r = nSn/(nSn + nTi)=1, 1/5, 1/6, 1/7, 1/8, 1/9, 1/10, 1/11 , 0 . Results indicated that the proportion of SnO2 and TiO2 had a critical effect on the photocatalytic activity. Under ultraviolet light irradiation, the highest degradation rate of 30mg/L p-nitroaniline was 99.8% within 90 min by using Att-SnO2-TiO2 r = 1/8 as photacatalyst. The repeated use of the composite photocatalyst was also confirmed and degradation rate 30mg/L p-nitroaniline maintained 98.7% after 5 times usage.

Key words: Attapulgite, Photocatalyst, Sol - gel dip, Att-SnO2-TiO2, p-nitroaniline

 目   录

1  引 言 4

2  实验部分 5

2.1复合光触媒剂的制备 5

2.2 材料表征 5

2.3 材料的光催化性能 6

3 结果与讨论 6

3.1触媒剂的表征 6

3.2 紫外光触媒性能研究 9

3.2.1 触媒剂工作条件的选择 9

3.2.1.1对硝基苯胺浓度的选择 9

3.2.1.2触媒剂的投入量 10

3.2.1.3对硝基苯胺初始溶液的pH值 11

3.2.2 凹凸棒土复合光触媒材料的光触媒性能研究 11

3.2.2.1对硝基苯胺降解产物