石墨相氮化碳负载钴的制备及其可见光催化性能  

Preparation and Visible-Light-Driven Catalytic Performance of Co/g-C_(3)N_(4)

作　　者：汪园园 王梦 贾仕骏 丁世强 朱姚先 WANG Yuan-yuan;WANG Meng;JIA Shi-jun;DING Shi-qiang;ZHU Yao-xian(Jinling Institute of Technology,Nanjing 211169,China)

机构地区：[1]金陵科技学院材料工程学院,江苏南京211169

出　　处：《金陵科技学院学报》2024年第1期63-71,共9页Journal of Jinling Institute of Technology

基　　金：国家自然科学基金青年项目(22206065);金陵科技学院高层次人才科研启动项目(jit-b-202024)。

摘　　要：使用金属负载的方式对石墨相氮化碳进行改性,得到石墨相氮化碳负载钴光催化剂(Co/g-C_(3)N_(4))。采用电子显微镜、X射线衍射仪、X射线光电子能谱仪、紫外可见漫反射光谱、光致发光光谱以及光电化学测试对制备的催化剂进行了表征。通过光催化评价系统探究了Co/g-C_(3)N_(4)光催化降解盐酸四环素(TC)的效果,以及不同催化剂投入量、污染物浓度等因素对Co/g-C_(3)N_(4)光催化降解TC的影响及机理。结果表明,钴金属的负载使得石墨相氮化碳电子-空穴对的分离效率进一步提高,催化剂的光催化活性得到改善,且钴负载后的石墨相氮化碳的晶体结构与表面形貌并未发生改变;1%Co/g-C_(3)N_(4)在120 min内可见光下对TC去除率可达95.68%,TC去除速率是纯g-C_(3)N_(4)催化下的2.3倍,5次催化循环后对TC的光催化降解效率仍保持在80%以上,有着良好的稳定性和可回收性;光催化反应中空穴和羟基自由基为主要活性物质。Graphite-phase carbon nitride was modified by metal loading to obtain cobalt photocatalyst supported on graphite-phase carbon nitride(Co/g-C_(3)N_(4)).The prepared catalysts were characterized using electron microscopy,X-ray diffraction,X-ray photoelectron spectroscopy,UV-visible diffuse reflectance spectroscopy,photoluminescence spectroscopy,and photoelectrochemical testing.The effectiveness of photocatalytic degradation of tetracycline hydrochloride(TC)over Co/g-C_(3)N_(4)was investigated through a photocatalytic evaluation system,and so did the effects and the mechanism of different catalyst inputs,pollutant concentrations,and other factors on the photocatalytic degradation of TC by Co/g-C_(3)N_(4).The results showed that the loading of metal cobalt further improved the separation efficiency of electron-hole pairs in graphite-phase carbon nitride,and enhanced the photocatalytic activity of the catalyst.Furthermore,it did not change the crystal structure and surface morphology of graphite-phase carbon nitride after cobalt loading.The removal quantity of TC over 1%Co/g-C_(3)N_(4)under visible light can reach 95.68%within 120 minutes.The removal rate of TC is 2.3 times that of pure g-C_(3)N_(4)Catalysis.The photocatalytic degradation efficiency of TC after five catalytic cycles was above 80%,indicating good stability and recyclability.It was found that holes and hydroxyl radicals were the main active substances in the photocatalytic reaction.

关 键 词：石墨相氮化碳 钴负载 光催化降解 盐酸四环素 

分 类 号：TB3[一般工业技术—材料科学与工程] X592[环境科学与工程—环境工程]