NiS-g-C3N4光催化剂的制备及其光催化性能的研_究毕业论文.docx

(北京)

CHINA UNIVERSITY OF PETROLEUM
毕业论文
NiS-g-C3N4光催化剂的制备及其光催化性能的研究
院系名称: 理学院
专业名称:材料科学与工程
学生姓名: 徐星
学号: 2009047125
指导教师: 戈磊
完成日期 2013 年 6 月 10 日
NiS-g-C3N4光催化剂的制备及其光催化性能的研究
摘要
传统光催化材料TiO2由于能带很宽,只能吸收利用太阳光中的紫外光部分,能量利用率低;其次光生电子空穴容易复合,量子产率低。本文以g-C3N4光催化剂为研究对象。具有层状石墨结构的g-C3N4光催化剂具有制备方法简单,价格低廉,可见光活性好等特点,且对环境无危害作用,是一种环境友好型光催化剂。但纯g-C3N4光催化剂具有光量子效率低、载流子易复合、可见光利用效率差等缺点,使得其光催化活性较低。有文献报道NiS是一种非常好的助剂,本实验主要是探究NiS对g-C3N4光催化剂性能的影响,探究光生载流子激发、迁移、复合、分离规律。深入研究改性剂作用机制,明确改性g-C3N4的光催化机理,设计出高性能的光催化体系。
关键词:g-C3N4 ;NiS;光催化
The Synthesis and Photocatalytic properties of NiS-g-C3N4photocatalysts
ABSTRACT
Traditional photocatalytic TiO2 is a wide band gap material, only absorb the ultraviolet part of the sunlight and energy utilization is very low; next rapid bination of the photo-generated electron hole leads to its low quantum efficiency. In this paper, novel photocatalysts g-C3N4 is the research material. This polymeric graphitic carbon photocatalyst preparation simple, inexpensive, and no harmful effects on the envrioment, is an environmently friendly photocatalyst. However, the photocatalytic efficiency of pure g-C3N4 is limited due to the bination of its photo-generated electron-hole pairs. It has been reported NiS is a very good additive. This experiment is to explore the NiS on the g-C3N4 photocatalysts Performance, Explore photoproduction carrier excitation, migration, composite, separation rule. In-depth study of MOdifying agent mechanism, clear MOdified photocatalytic mechanism of g - C3N4, design a high performance light catalytic systems.
Key words:g - C3N4;NiS;Photocatalytic
目录
摘要 I
ABSTRACT II
第1章 绪论 1
引言 1
光催化剂的背景及其研究现状 1
氮化碳的简介 3
类石墨氮化碳材料的简介 4
基本性质 4
g-C3N4的制备方法 7
g-C3N4在光催化方面的应用 7
降解有机染料 7
8
影响g-C3N4光催化活性的因素 8
煅烧温度影响 8
比表面积的影响 9
晶体缺陷 9
g-C3N4的改性方法 9
复合半导体 9
染料光敏化 10
贵金属沉积 10
金属离子的掺杂 10
非金属掺杂 11
多元共掺杂改性 11
实验与表征 12