摘要
以一步法原位合成了g-C3N4/ZnO异质结复合材料,评价其在可见光下降解亚甲基蓝（MB）的光催化活性,并探讨了g-C3N4/ZnO的光催化机制。运用XRD、FTIR、SEM和UV-Vis DRS对所合成的复合材料进行表征。结果表明,经复合后g-C3N4和ZnO紧密结合,构建了异质结,提高了光生电子空穴的分离效率,并且在可见光区表现出较强的光响应性;当g-C3N4的质量分数为19%时,复合材料g-C3N4/ZnO降解MB的反应速率常数为0.020 6 min-1,是纯g-C3N4的3.8倍。催化剂重复使用5次,仍保持较高的光催化活性。
A series of g-C3N4/ZnO heterojunction composites were prepared through a one-pot in situ approach. The photocatalytic activities of the samples were evaluated by the photodegradation of methylene blue（MB） under visibte light irradiation and the mechanism of g-C3 N4/ZnO photocatalytic reaction was investigated. The resulting products were characterized by means of X-ray diffraction （ XRD）, Fourier transform infrared spectroscopy （ FTIR）, scanning electron microscopy （ SEM ） and UV- visible spectrophotometer （UV-vis DRS）. The results showed that heterojunctions are formed between g- C3 N4 and ZnO, which improve the separation of electron-hole pairs and have stronger light response in visible region. When the mass fraction of g-C3N4 was 19%, the reaction rate constant for MB degradation over g-C3N4/ZnO was 0. 020 6 rain-1 which was 3.8 times that of pure g-C3N4. The regenerated catalyst still kept good catalytic performance after recycling 5 times.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2018年第2期228-232,266,共6页
Fine Chemicals
基金
国家自然科学基金(21476110)
南通市科技局应用基础研究项目(MS12016045,CP12014004)
江苏省“青蓝工程”资助项目,南通职业大学校级重点课题(16ZK01)~~
