铁/硫共掺杂的石墨相氮化碳及其光催化性能  

Iron/sulfur co doped graphite phase carbon nitride and its photocatalytic performance

作　　者：梁龙 陆帅帅 刘亚男 江芳[1] 陈欢[1] LIANG Long;LU Shuaishuai;LIU Yanan;JIANG Fang;CHEN Huan(School of Environmental and Biological Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学环境与生物工程学院,南京210094

出　　处：《环境保护科学》2024年第3期71-81,共11页Environmental Protection Science

基　　金：中央高校基本科研业务费专项资金(30920021113)。

摘　　要：文章以三聚氰胺、三聚硫氰酸和硝酸铁为原料,通过热聚合法制得铁/硫共掺杂的石墨相氮化碳(Fe/S-CN)催化剂。利用TEM、XRD、FT-IR、EIS等手段对聚合过程中间体和所得Fe/S-CN催化剂进行表征,结果表明三聚氰胺和三聚硫氰酸在热聚合过程中形成铁/硫掺杂的纳米薄层材料。以水中双酚A为目标污染物,考察Fe/S-CN的光催化性能,结果表明在模拟太阳光条件下,2%Fe/S-CN具有最好的污染物降解活性,光照3 h后20 mg/L双酚A的降解率可达92.8%,明显优于硫掺杂石墨相氮化碳和体相石墨相氮化碳。光电流和电化学阻抗的结果表明,铁/硫的掺杂提高了光生电子-空穴对的分离效率;EIS结果说明了金属修饰和非金属掺杂改善了载流子的传输性能,有利于载流子分离。自由基猝灭实验证实,光生空穴、单线态氧和超氧自由基是Fe/S-CN光催化双酚A氧化还原反应的主要活性物种。Graphite phase carbon nitride(Fe/S-CN)catalyst with iron/sulfur co-doping was prepared by hot polymerization with melamine,thiocyanic acid and ferric nitrate as raw materials.The intermediates and the obtained Fe/S-CN catalysts were characterized by TEM,XRD,FT-IR and EIS.The results showed that the Fe/sulfur-doped nano-thin layer materials were formed by the hot polymerization of melamine and polythiocyanic acid.The photocatalytic performance of Fe/S-CN was investigated using BPA as the target pollutant in water.2%Fe/S-CN had the best pollutant degradation activity under simulated sunlight conditions,and the degradation rate of 20 mg/L BPA was up to 92.8%after 3 h of illumination,which was significantly better than sulfur-doped graphite phase carbon nitride and bulk graphite phase carbon nitride.The results of photocurrent and electrochemical impedance show that Fe/S doping improves the separation efficiency of photogenerated electron-hole pairs.The EIS results showed that metal modification and non-metal doping improved the carrier transport performance and facilitated carrier separation.Free radical quenching experiments confirmed that photogenerated holes,singlet oxygen and superoxide free radicals were the main active species of Fe/S-CN photocatalyzed bisphenol A REDOX reaction.

关 键 词：石墨相氮化碳 铁/硫共掺杂 光催化 双酚A 

分 类 号：X703[环境科学与工程—环境工程] O643.36[理学—物理化学]