唐丹,尹梦云,宋雪平,周丽梅,周娅芬.EDTA有效促进石墨相氮化碳(g-C3N4)光催化降解甲基橙[J].分子催化,2018,32(5):461-470
EDTA有效促进石墨相氮化碳(g-C3N4)光催化降解甲基橙
Graphitic Carbon Nitride (g-C3N4) Photocatalyzed Degradation MO using EDTA as Efficient Accelerating Agent
投稿时间:2018-07-29  修订日期:2018-08-20
DOI:
中文关键词:  石墨相氮化碳  乙二胺四乙酸  甲基橙  光催化  光降解
英文关键词:g-C3N4  ethylenediaminetetraacetic acid  methyl orange  photocatalysis  photodegradation
基金项目:The authors are grateful for financial support from the Key Project of the Education Department of Sichuan Province (18ZA0474) and the Project of Talents Research Fund of China West Normal University (17YC040).
作者单位E-mail
唐丹 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  
尹梦云 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  
宋雪平 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  
周丽梅 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  
周娅芬 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 cwnuzyf@163.com 
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中文摘要:
      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-C3N4)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-C3N4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·O2-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g-C3N4光催化降解MO的机理.这些结果为提高g-C3N4光催化降解水体中有机污染物的性能提供了一种新方法.
英文摘要:
      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.
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