摘要本论文以单氰胺和硝酸钴作为前驱体，原位制备了载钴石墨相氮化碳（Co/g-C3N4, CN(Co)），再利用光沉积法制备了钴钯双金属负载氮化碳（CN(Co/Pd)）。对 g-C3N4、CN(Co) 和 CN(Co/Pd)进行 X 射线衍射分析（XRD）、傅里叶红外光谱分析（FT-IR）、X 射线光电 子能谱（XPS）、紫外漫反射光谱分析（UV-vis DRS）等分析表征。结果表明，制得的 CN(Co) 和 CN(Co/Pd)与 g-C3N4 具有相似的晶型结构，但 CN(Co)和 CN(Co/Pd)的带隙能比 g-C3N4 小，可见光吸收能力和光生电子和空穴的分离率得以提高，从而提高了其光催化活性。 所得 CN(Co/Pd)催化剂同时具有光催化活性和催化加氢脱氯活性，将其用于催化加氢脱氯-光催化连用处理 2,4-二氯苯氧乙酸（2,4-D）时，其处理效率明显高于单独光催化处理 2,4-D。可见，CN(Co/Pd)作为一种双功能性催化剂，可用于催化加氢脱氯-光催化连用处 理难降解含氯污染物，为含氯污染物的处理提供了新的处理思路。78373

毕业论文关键词  钴钯双金属负载氮化碳  可见光催化  催化加氢脱氯 2,4-D

毕 业 设 计 说 明 书 外 文 摘 要

Title The study on the combined use of catalytic hydrodechlorination and visible-light photocatalysis in degradation process of 2,4-D

Abstract Cobalt modified g-C3N4 (Co/g-C3N4, CN(Co))were prepared via a in-situ method, which used cyanamide and cobalt nitrate as precursor。 Then both palladium and cobalt modified g-C3N4 (CN(Co/Pd))were prepared via a light deposition method。 The samples were characterized by a variety of techniques, including X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR), X-ray photoelectron spectroscopy (XPS) and UV-vis DRS。 Results showed that cobalt modified g-C3N4 basically have the same crystal structure as their parent bulk g-C3N4, and possess smaller band gap energy and wider visible light absorbance range。 The separation efficiency of photogenerated holes and electron pairs were effectively improved。 CN(Co/Pd) had photocatalytic activity and catalytic hydrogenation activity。 As a result, when catalytic hydrodechlorination and visible-light photocatalysis are both used in the degradation experiments of 2,4-D, the degradation efficiency was higher than that when the visible-light photocatalysis was only used。 Obviously, as a bifunctional catalyst, CN(Co/Pd) can be used for catalytic hydrodechlorination photocatalysis for treatment of refractory chlorinated pollutants, which provides a new approach for the treatment of chlorinated pollutants。

Keywords both palladium and cobalt modified g-C3N4 visible-light photocatalysis catalytic hydrodechlorination     2,4-D

目 次

1 绪论 1

1 。 1 2,4 - 二氯苯氧乙酸简介 1

1。2 主要去除技术 1

1。3 催化加氢技术 2

1。4 半导体光催化技术 3

1。5 本课题选题意义及内容 3

2 实验部分 5

2。1 实验试剂及仪器 5

2。2 催化剂的制备 6

2。3 催化剂的表征方法