EDTA有效促进石墨相氮化碳(g-C_3N_4)光催化降解甲基橙（英文）  

Graphitic Carbon Nitride(g-C_3N_4) Photocatalyzed Degradation MO using EDTA as Efficient Accelerating Agent

作　　者：唐丹 尹梦云[1] 宋雪平 周丽梅[1] 周娅芬[1] TANG Dan;YIN Meng-yun;SONG Xue-ping;ZHOU Li-mei;ZHOU Ya-fen(Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province,China West Normal University,Nanchong 637000,Sichuan,China)

机构地区：[1]四川省化学合成与污染控制重点实验室,西华师范大学化学化工学院,四川南充637002

出　　处：《分子催化》2018年第5期461-470,共10页Journal of Molecular Catalysis(China)

基　　金：grateful for financial support from the Key Project of the Education Department of Sichuan Province(18ZA0474);the Project of Talents Research Fund of China West Normal University(17YC040)

摘　　要：研究了在光照下,乙二胺四乙酸(EDTA)的添加促进石墨相氮化碳(g-C_3N_4)光催化降解甲基橙(MO).研究了H+和羧酸根负离子对光降解MO的影响.紫外-可见漫反射光谱(DRS)研究表明,EDTA的加入并没有改变g-C_3N_4的电子结构和光电特性. EDTA的加入捕获了空穴(h+),促进了光生e-/h+对的分离,从而使光降解活性提高.证明了·O-2是光催化降解过程中的主要活性物种.基于上述研究结果,我们提出了一种可能的EDTA促进gC_3N_4光催化降解MO的机理.这些结果为提高g-C_3N_4光催化降解水体中有机污染物的性能提供了一种新方法.The enhancement of g-C3N4 photocatalytic degradation of methyl orange（MO） via ethylenediaminetetraacetic acid（EDTA） addition was investigated under light irradiation. The effects of H＋and carboxylate anions on the MO degradation were investigated in this reaction. An investigation by UV-vis diffuse reflectance spectroscopy（DRS） reveals that the addition of EDTA has not changed the electronic structure and photoelectric property of g-C3N4. It was considered that the addition of EDTA trapped the holes（h＋） and promoted the separation rate of the e-/h＋pairs,resulting in an increase in photodegradation activity. It is verified that ·O2^- species are the major oxide species during photocatalytic degradation process. Therefore,a plausible mechanism that EDTA promotes photodegradation of MO by g-C3N4 is proposed. This work provides a new approach for a better catalytic performance of g-C3N4 on treatment of organic contaminants in aqueous system.

关 键 词：石墨相氮化碳 乙二胺四乙酸 甲基橙 光催化 光降解 

分 类 号：O643.36[理学—物理化学]