改性石墨相氮化碳的制备及其可见光催化水中双酚A的性能研究

摘要本课题利用尿素和酒石酸的共聚缩合制备了改性石墨相氮化碳光催化剂 (DL-g-C3N4)；利用 X 射线衍射（XRD）、紫外可见漫反射（UV-vis DRS）、傅里叶红外光谱（FT-IR）、透射电镜（TEM）、元素分析等表征手段对制得的催化剂进行表征；以双酚 A（BPA）为目标污染物对催化剂的可见光催化性能进行探索。实验发现，改性石墨相氮化碳拥有比纯石墨相氮化碳更好的光催化性能。平行对比了不同酒石酸量与尿素共聚得到的改性石墨相氮化碳，发现当酒石酸的质量分数为 0。5 wt%时，催化剂的性能最好。同时，为了初步探讨光催化反应的机理，向双酚 A 溶液中投加了对苯醌、碘化钾、叔丁醇等捕获剂用来捕获光催化进程中产生的活性物质，实验发现超氧自由基对光催化降解进程中起到了主导作用。73779

毕业论文关键词光催化 DL-g-C3N4 改性双酚 A

毕业设计说明书外文摘要

Title The preparation of modified graphite carbon nitride and the photocatalytic performance under visible light irradiation。

Abstract

In this paper, modified graphitic carbon nitride was obtained through the copolymerization of urea and tartaric acid, denoted as DL-g-C3N4。 To analyze the phase composition and the optical property, catalysts was characterized by X - ray diffraction (XRD), UV-vis diffuse reflection spectroscopy (DRS), Fourier transform infrared (FT-IR),Transmission electron microscope(TEM)and elemental analysis; At the same time, 20ppm bisphenol A (BPA) as the target pollutant to evaluate the photocatalytic activities of the samples, the results showed that modified g-C3N4 exhibited better photocatalytic performance compared with bulk g-C3N4 under visible light irradiation。 The optimum content of tartaric acid was 0。5 wt%。 In addition, KI, p-benzoquinone and tert butanol were used to capture the active species including •O -, •OH and holes scavengersproduced in the process of photocatalytic degradation of BPA, experimentindicated that •O - played a leading role in the whole photocatalytic process。

Keywords photocatalysis graphitic carbon nitride modification bisphenol A

1 绪论 1

1。1 双酚 A 的介绍 1

1。2 半导体光催化的原理 2

1。3 半导体光催化的局限性 3

1。4 石墨相氮化碳的研究概况 3

1。5 本实验的研究内容 5

2 实验部分 7

2。1 实验试剂及仪器 7

2。2 实验方法 7

2。3 表征方法 8

2。4 光催化反应 8

3 结果分析与讨论 10

3。1 改性石墨相氮化碳的制备及其可见光催化水中双酚A的性能研究:http://www.youerw.com/huaxue/lunwen_83478.html