g-C_(3)N_(4)的刻蚀介质、酸碱环境对降解性能的影响及降解选择性和机理探究  

Effects of etching medium,acid-base environment on degradation performance of g-C_(3)N_(4)and its degradation selectivity and mechanism

作　　者：郭桂全[1] 邢翠娟[1] 张淑娇 王彦娜[1] 郭焕焕 武诺豪 GUO Gui-quan;XING Cui-juan;ZHANG Shu-jiao;WANG Yan-na;GUO Huan-huan;WU Nuo-hao(School of Chemical Engineering and Biotechnology,Xingtai University,Xingtai 054001,China)

机构地区：[1]邢台学院化学工程与生物技术学院,河北邢台054001

出　　处：《化学研究与应用》2025年第4期814-820,共7页Chemical Research and Application

基　　金：邢台市科技计划项目(2023ZZ076)资助。

摘　　要：使用热聚法制备了石墨相氮化碳(g-C_(3)N_(4)),然后用二甲亚砜、NaOH溶液和H_(2)SO_(4)溶液分别对g-C_(3)N_(4)进行刻蚀。并且使用XRD和SEM对g-C_(3)N_(4)以及刻蚀后的g-C_(3)N_(4)进行表征。结果表明,刻蚀后的材料依旧是g-C_(3)N_(4)。通过在可见光照射下使用UV-Vis光谱对罗丹明B的降解效果评价材料的性能,发现H_(2)SO_(4)溶液刻蚀得到的材料降解性能较好。同时探索了g-C_(3)N_(4)在酸性、碱性环境中的光催化降解效果。结果表明,在酸性环境(pH=1)下,降解率较高。接着在酸性条件下,使用经H_(2)SO_(4)溶液刻蚀得到的材料对罗丹明B进行降解,结果表明降解性能进一步提升,且降解时间更短。最后在酸性环境下比较了降解罗丹明B、亚甲基蓝和甲基橙的效果,发现对亚甲基蓝的降解效果好于罗丹明B,甲基橙最差,说明g-C_(3)N_(4)对污染物的降解有选择性。机理研究结果表明超氧自由基在光催化过程中起主导作用,空穴和羟基自由基未起作用。Graphitic carbon nitride(g-C_(3)N_(4))was prepared by thermal polymerization,and then the g-C_(3)N_(4)was etched with dimethyl sulfoxide,NaOH solution and H_(2)SO_(4)solution respectively.XRD and SEM were used to characterize g-C_(3)N_(4)and etched g-C_(3)N_(4).The results show that the etched material is still g-C_(3)N_(4).By using UV-Vis spectrum to evaluate the degradation effect of rhodamine B under visible light irradiation,it is found that the material etched by H_(2)SO_(4)solution has better degradation performance.At the same time,the photocatalytic degradation effect of g-C_(3)N_(4)in acidic or alkaline environment was explored.The results show that the degradation rate is high in acidic environment(pH=1).Then,under acidic conditions,the material etched by H_(2)SO_(4)solution was used for photocatalytic degradation of rhodamine B.The results show that the degradation performance is further improved and the degradation time is shorter.Finally,the degradation effects of rhodamine B,methylene blue and methyl orange were compared in acidic environment,and it was found that the degradation effect of methylene blue was better than that of rhodamine B,and methyl orange was the worst,indicating that g-C_(3)N_(4)was selective for the degradation of pollutants.The results of mechanism research show that superoxide radical plays a leading role in the photocatalytic process,while holes and hydroxyl radicals have no effect.

关 键 词：g-C_(3)N_(4)光催化剂 制备 刻蚀 降解 机理 

分 类 号：O614.4[理学—无机化学]