Preparation of nanorods MnO2 modified g-C3N4 photocatalyst and its performance in degradation of RhB
谢继苗 1毛娜 1张宇航 1林诗音1
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作者信息
1. 渭南师范学院,陕西渭南 714099
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摘要
通过水热法制备纳米棒MnO2修饰g-C3N4复合异质结光催化剂.通过XRD、FT-IR和PL等表征手段证明,复合材料的分子结构和化学键没有被破坏,其空穴-电子对的复合作用得到有效抑制.在光催化-类Fenton反应的复合体系下,探究MnO2/g-C3N4对RhB溶液的降解性能和机理.结果表明,采用25 mg 11％-MnO2/g-C3N4催化剂降解50 mL RhB(20 mg·L-1)溶液,反应时间10 min时降解率达到95％,60 min时最大降解率达到99％.MnO2/g-C3N4在光催化-类Fenton体系中对RhB降解起主要作用的是超氧基阴离子自由基(·O2-).
Abstract
In this paper,nanorods MnO2 modified g-C3N4 composite heterojunction photocatalysts were prepared by hydrothermal method.The characterization of XRD,FT-IR and PL proved that the molecular structure and chemical bonds of the composite materials were not destroyed,and the recombination of the hole-electron pair was effectively inhibited.Under the system of photocatalysis-Fenton-like reaction,the degradation performance and mechanism of MnO2/g-C3N4 composite photocatalysts in RhB solution were investigated.In the experiment,the degradation of 50 mL RhB(20 mg·L-1)solution using 25 mg 11％-MnO2/g-C3N4 catalyst reached 95％in 10 minutes,and the maximum degradation reached 99％in 60 minutes.It was found that the superoxide anion radical(·O2-)contributed mostly to the degradation of RhB in the photocatalytic-Fenton-like system of MnO2/g-C3N4.
关键词
催化化学/纳米棒MnO2/g-C3N4光催化剂/类Fenton体系/降解罗丹明B
Key words
catalytic chemistry/nanorods MnO2/g-C3N4 photocatalyst/Fenton-like system/degradation of RhB
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