摘要
通过热剥离(空气、氢气),超声剥离及硼氢化钠化学剥离的方式对体相石墨型氮化碳进行处理,制备了不同性能的薄层氮化碳。采用X射线衍射、X射线光电子能谱、Fourier变换红外光谱、固体紫外可见漫反射谱、氮气物理吸附等仪器对所制样品的结构和性能进行了表征,并考察了样品对水相有机污染物的光催化降解性能。结果表明:剥离方式对氮化碳的物化和光催化性能有较大的影响,在空气中剥离的氮化碳(g-CN_A)表现出最佳的光催化性能,40min时对盐酸四环素(TC)的降解率高达99.87%,且4次循环使用后仍具有良好的循环稳定性。捕获剂探究反应机理实验结果表明,超氧自由基(·O_(2)^(-))是该反应的主要活性物种。
Several exfoliation methods including thermal treatment in air and hydrogen, ultrasonication, and chemical treatment with sodium borohydride were applied to modify the properties of bulk graphitic carbon nitride(g-CN). The prepared samples were characterized by X-ray diffraction, X-ray photoemission spectroscopy, Fourier transform infrared spectroscopy, UV-Vis diffuse reflectance spectroscope and N_(2) physisorption, and their photocatalytic performances were evaluated via the degradation of organic pollutants in aqueous solution. The results indicated that the exfoliation methods affect greatly on the physicochemical and photocatalytic properties of g-CN, and the optimum sample can be obtained by thermal treating in air(g-CN_A), showing 99.87%conversion at 40 min for the photocatalytic degradation of tetracycline hydrochloride, and the performance was preserved even after four cycles. The mechanism on the reaction intermediates with trapping experiments indicated that superoxide anion radicals(·O_(2)^(-))are the main active species of the reaction.
作者
朱君江
肖瑶
颜亚玉
许雪莲
肖萍
何志艳
ZHU Junjiang;XIAO Yao;YAN Yayu;XU Xuelian;XIAO Ping;HE Zhiyan(College of Chemistry and Chemical Engineering,Wuhan Textile University,Wuhan 430200,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2023年第1期40-48,共9页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(21976141)
湖北省科技厅创新团队(2021CFA034)
湖北省教育厅高等学校优秀中青年科技创新团队(T2020011)。
关键词
石墨型氮化碳
剥离方式
光催化降解
盐酸四环素
反应机理
graphitic carbon nitride
exfoliation method
photocatalytic degradation
tetracycline hydrochloride
reaction mechanism
作者简介
第一作者:朱君江(1977-),男,博士,教授,E-mail:jjzhu@wtu.edu.cn。
