[1]齐璠静,李一兵,赵旭,等.钨掺杂g-C3N4薄膜电极的制备及光电性能研究[J].中国给水排水,2022,38(15):61-67.
　QIFan-jing,LIYi-bing,ZHAOXu,et al.Preparation of Tungsten-doped g-C3N4 Film Electrode and Its Photoelectric Properties[J].China Water & Wastewater,2022,38(15):61-67.
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钨掺杂g-C3N4薄膜电极的制备及光电性能研究

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第38卷 期数: 2022年第15期 页码: 61-67 栏目: 出版日期: 2022-08-01
Title:
Preparation of Tungsten-doped g-C3N4 Film Electrode and Its Photoelectric Properties
作者:
齐璠静1， 李一兵2， 赵旭3， 夏天1
（1.中国航天建设集团有限公司，北京 100071；2.河北工业大学 土木与交通学院，天津 300401；3.中国科学院生态环境研究中心 环境水质学国家重点实验室，北京 100085）
Author(s):
QI　Fan-jing1， LI　Yi-bing2， ZHAO　Xu3， XIA　Tian1
（1. China Aerospace Construction Group Co. Ltd.， Beijing 100071， China； 2. School of Civil and Transportation Engineering， Hebei University of Technology， Tianjin 300401， China； 3. State Key Laboratory of Environmental Aquatic Chemistry， Research Center for Eco-Environmental Sciences， Chinese Academy of Sciences， Beijing 100085， China）
关键词:
石墨相氮化碳;  钨掺杂;  薄膜电极;  光电性能
Keywords:
graphitic carbon nitride (g-C3N4);  tungsten doping;  film electrode;  photoelectric property
摘要:
采用高温液相生长法制备了不同钨（W）掺杂量的W/g-C3N4薄膜电极，并通过SEM、XRD、FTIR、UV/vis DRS、XPS等手段对薄膜电极进行表征。结果表明，掺杂的W以W0、WO2和WO3等多种形态存在。将W/g-C3N4薄膜电极用作光阳极，进行交流阻抗测试、光电流密度测试以及降解亚甲基蓝实验，与g-C3N4薄膜电极相比，W/g-C3N4薄膜电极对可见光的响应能力明显增强，其中当Na2WO4与g-C3N4的掺杂比为1∶50时光电流密度可提高至原来的2.2 倍。通过添加自由基捕获剂探究W/g-C3N4薄膜电极对亚甲基蓝的催化氧化机理，发现掺杂W之后，W/g-C3N4薄膜电极光生电子空穴对的分离效果提高，而且电子的迁移能力增强，因此光生电子能更多、更快地迁移到阴极铂丝，被O2捕获生成·O2-并最终生成·OH来降解亚甲基蓝；此外，WO3同样具有光催化活性，在可见光下可以生成光生电子空穴对，也可以提供电子被O2捕获并最终生成·OH来降解亚甲基蓝。
Abstract:
W/g-C3N4 film electrodes with different tungsten (W) doping contents were prepared by high temperature liquid-based reaction. Then, the film electrodes were characterized by SEM, XRD, FTIR, UV/vis DRS and XPS. The doped tungsten existed in various forms such as W0, WO2 and WO3. The W/g-C3N4 film electrode was used as a photoanode for electrochemical impedance spectroscopy (EIS) test, photocurrent density test and methylene blue degradation experiment. Compared with g-C3N4 film electrode, the photoelectric response of W/g-C3N4 film electrode to visible light was obviously enhanced. When the doping ratio of Na2WO4 and g-C3N4 was 1∶50, the photocurrent density of W/g-C3N4 film electrode was 2.2 times that of g-C3N4 film electrode. The mechanism of W/g-C3N4 film electrode for catalytic oxidation of methylene blue was investigated by adding free radical trapping agent. After doping tungsten, the separation of photoelectron hole pair in W/g-C3N4 film electrode was improved, and the electron migration ability was enhanced. Therefore, more photoelectron migrated faster to the cathode platinum, which was captured by O2 to generate ·O2- and eventually to generate ·OH to degrade methylene blue. In addition, WO3 also had photocatalytic activity to generate photoelectron hole pairs under visible light, and could also provide electrons to be captured by O2 and eventually generate ·OH to degrade methylene blue.

相似文献/References:

[1]苏荣军,姜灏,魏澜,等.g-C3N4基光催化剂的改性制备及在废水处理中的应用[J].中国给水排水,2023,39(10):55.
　SURong-jun,JIANGHao,WEILan,et al.Preparation and Modification of g-C3N4-based Photocatalyst and Its Application in Wastewater Treatment[J].China Water & Wastewater,2023,39(15):55.

更新日期/Last Update: 2022-08-01