论文总字数：19759字

摘 要

近几年来，随着工商业的迅速发展，环境污染问题也越来越严重，故而环境污染的治理深受人们的关注，而光催化技术无疑时解决环境污染的有效治理途径之一。本文以SnO₂作为光催化材料，对亚甲基蓝溶液进行了光催化降解实验。从光催化剂的浓度，反应溶液的浓度，反应时间以及催化剂的重复使用情况等等四个方面讨论了光催化剂SnO₂对光催化效果的影响。实验结果表明,当催化剂浓度为80mg/L, 亚甲基蓝的浓度为4mg/L在紫外光下照射50min时降解率可达98.91%。

关键词：纳米SnO₂ 光催化降解 亚甲基蓝

Photocatalytic Degradation of Methylene Blue by Nano SnO₂ Powders

Abstract

In recent years, with the rapid development of industry and commerce, the problem of environmental pollution has become more and more serious. Therefore, people pay much attention to the treatment of environmental pollution, and photocatalytic technology is undoubtedly one of the effective ways to solve environmental pollution. In this paper, SnO₂ was used as photocatalytic material for photocatalytic degradation of methylene blue solution. The effects of photocatalyst SnO₂ on photocatalytic performance were discussed from four aspects: the concentration of photocatalyst, the concentration of reaction solution, reaction time and the reuse of catalyst. The results show that the degradation rate can reach 98.91% when the catalyst concentration is 80 mg/L and the methylene blue concentration is 4 mg/L under ultraviolet irradiation for 50 minutes.

Key words：Nanometer SnO₂ Photocatalytic degradation Methylene blue

目录

摘要....................................................................................................................................................I

目录.................................................................................................................................................IV

第一章 文献综述..............................................................................................................................1

1.1引言..........................................................................................................................................1

1.2光催化的发展过程..................................................................................................................2

1.3半导体材料概述......................................................................................................................3

1.4半导体光催化的进本原理及影响因素..................................................................................3

1.5光催化剂的研究进展..............................................................................................................4

第二章 实验部分..............................................................................................................................6

2.1实验所需试剂及仪器..............................................................................................................6

2.2溶液的配制..............................................................................................................................6

2.3亚甲基蓝溶液降解率的计算..................................................................................................6

2.4最大吸收波长的测定..............................................................................................................7

2.5光催化部分..............................................................................................................................7

2.5.1催化剂用量对光催化效果的影响...............................................................................7

2.5.2反应物浓度对光催化效果的影响...............................................................................7

2.5.3反应时间对光催化效果的影响...................................................................................8

2.5.4催化剂的重复使用情况...............................................................................................8

第三章结果与讨论............................................................................................................................9

3.1亚甲基蓝水溶液最大吸收波长的测定及绘制标准曲线......................................................9

3.1.1亚甲基蓝溶液最大吸收波长的测定...........................................................................9

3.1.2绘制标准曲线.............................................................................................................10

3.2催化剂用量对光催化效果的影响........................................................................................10

3.3反应物浓度对光催化效果的影响........................................................................................11

3.4反应时间对光催化效果的影响............................................................................................12

3.5催化剂的重复使用情况........................................................................................................13

第四章.结论与展望.........................................................................................................................15

4.1结论........................................................................................................................................15

4.2展望........................................................................................................................................15

参考文献..........................................................................................................................................17

致谢..................................................................................................................................................20

第一章 文献综述

1.1引言

随着我国经济的高速发展，人们的生活也越来越优渥，使得人们也注意到了以前不曾注意的方方面面，例如环境污染的治理，工业废水的降解等等。废水中的污染物降解非常困难，所以污染废水的不正当排放会对人们的生存环境造成十分严重的危害，严重危害生物的生存环境及健康。因此，人们大力发展可降解污染废水的技术[1-3]。而光催化降解处理污染废水是一种十分别致，有发展前途的方法，是人们理性的方法，因为它消耗能源低，不会产生二次污染。

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