[1]李冬梅,张博雯,蒋树贤,等.MnO2/g-C3N4纳米复合材料的合成及其光催化性能[J].中国给水排水,2022,38(13):83-89.
　LIDong-mei,ZHANGBo-wen,JIANGShu-xian,et al.Synthesis of MnO2/g-C3N4 Nanocomposite and Its Photocatalytic Properties[J].China Water & Wastewater,2022,38(13):83-89.
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MnO2/g-C3N4纳米复合材料的合成及其光催化性能

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第38卷 期数: 2022年第13期 页码: 83-89 栏目: 出版日期: 2022-07-01
Title:
Synthesis of MnO2/g-C3N4 Nanocomposite and Its Photocatalytic Properties
作者:
李冬梅1， 张博雯1，2， 蒋树贤1， 谢震宇3， 王逸之4， 黄毅1， 李树彬1， 龙思宇1
（1.广东工业大学 土木与交通工程学院，广东 广州 510006；2.广州市城市规划勘测设计研究院，广东 广州 510006；3.复旦大学 物理学系，上海 200433；4.麻省理工学院，美国）
Author(s):
LI　Dong-mei1， ZHANG　Bo-wen1，2， JIANG　Shu-xian1， XIE　Zhen-yu3， WANG　Yi-zhi4， HUANG　Yi1， LI　Shu-bin1， LONG　Si-yu1
（1. School of Civil and Transportation Engineering， Guangdong University of Technology， Guangzhou 510006， China； 2. Guangzhou Urban Planning & Design Survey Research Institute， Guangzhou 510006， China； 3. Department of Physics， Fudan University， Shanghai 200433， China； 4. Massachusetts Institute of Technology， America）
关键词:
石墨类氮化碳改性;  形貌调控;  MnO2掺杂;  可见光活性;  甲基橙;  光催化性能
Keywords:
graphite carbon nitride modification;  morphology control;  MnO2 doping;  visible light activity;  methyl orange;  photocatalytic performance
摘要:
通过Na2SO4进行形貌调控和MnO2掺杂对石墨类氮化碳（g-C3N4）改性，采用水热法制备多形貌的MnO2/g-C3N4复合光催化剂（MCN），探讨最佳合成条件；研究不同形貌MCN的微观结构、光吸收能力以及对甲基橙（MO）的光催化降解性能。结果表明，MCN的最佳制备条件如下：Na2SO4、g-C3N4、KMnO4投加量分别为0.04、0.6、0.12 g/L，反应温度为80 ℃，反应时间为4 h。MnO2掺杂可显著提高g-C3N4的光催化活性。MCN对MO的光催化降解率高达97.34%，而g-C3N4仅为54.39%；MCN具有较强的可见光响应活性，最大吸收边带为486 nm，禁带宽度（Eg）为2.40 eV（g-C3N4的Eg值为2.61 eV）；MCN的结晶度高、纯度好，光催化性能稳定，重复利用5次后对MO的光催化降解率仍能达到96.34%。不同剂量的Na2SO4能调节MCN的形貌，进而改善其光催化活性，球状MCN比棒状MCN对MO的光催化降解率更高（前者为97.34%，后者为87.21%）。MCN的光催化降解机理为：通过光照产生的活性因子·OH和·O2-来氧化分解MO。
Abstract:
Graphite carbon nitride (g-C3N4) was modified by morphology regulation of Na2SO4 and doping of MnO2. Multi-morphological MnO2/g-C3N4 composite photocatalyst (MCN) was prepared by hydrothermal method, the optimum synthesis conditions were discussed, and the microstructure, light absorption capacity and methyl orange (MO) photocatalytic degradation performances of MCN with different morphologies were investigated. The optimum synthesis conditions of MCN were as follows: the dosage of Na2SO4, g-C3N4 and KMnO4 were 0.04 g/L, 0.6 g/L and 0.12 g/L, respectively, the reaction temperature was 80 ℃ and the reaction time was 4 h. The doping of MnO2 significantly improved the photocatalytic activity of g-C3N4. MCN had a photocatalytic degradation efficiency of MO up to 97.34%, while that of g-C3N4 was only 54.39%. MCN had high visible light response activity, the maximum absorption sideband was 486 nm, and the band gap (Eg) was only 2.40 eV (Eg of g-C3N4 was 2.61 eV). MCN had high crystallinity, good purity and stable photocatalytic performance. The photocatalytic degradation efficiency of MO still reached 96.34% after 5 times of reuse. Different dosages of Na2SO4 were capable of adjusting the morphology of MCN, and then improved its photocatalytic activity. The photocatalytic efficiency of spherical MCN for MO degradation was higher than that of rod MCN (the former was 97.34% and the latter was 87.21%). The photocatalytic degradation mechanism of MCN was that MO was decomposed by the active agents ·OH and ·O2- produced by light.
更新日期/Last Update: 2022-07-01