改性氮化碳的无光催化降解苯酚研究

Non-photocatalytic Degradation of Phenol by Modified Carbon Nitride

该研究通过热聚合方法实现了对氮化碳的制备和离子掺杂改性。采用改性氮化碳催化电芬顿体系降解苯酚试验研究,确定改性氮化碳的最佳制备条件为:掺杂硝酸镍和三聚氰胺的质量比为0.55 g∶10 g,焙烧温度为500℃,煅烧时间为3.5 h。使用改性后的氮化碳粉末,电芬顿体系苯酚降解率提高近20%,30 min对苯酚的去除率可达96.7%,实现了改性氮化碳在无光条件下的催化降解苯酚。通过XRD、FTIR、SEM和EDS对改性氮化碳进行了表征,证明了Ni元素在氮化碳分子间的成功掺杂,但没有改变氮化碳的分子结构;通过高效液相色谱-质谱联用技术测定和分析了苯酚降解过程中的中间产物和可能的降解路径。

In this study,carbon nitride was prepared and the modification of ion doping were fulfilled by thermal polymerization method.The modified carbon nitride was employed to catalyze the electro-Fenton system to degrade phenol,and the optimal preparation conditions of the modified carbon nitride were determined as the mass ratio of doped nickel nitrate and melamine 0.55 g:10 g,the calcination temperature 500 C,and the calcination time 3.5 h.Applying the modified carbon nitride powder,the degradation rate of phenol in the electro-Fenton system could be increased by about 20%,and the removal rate of phenol could reach 96.7%in 30 min.In this way,the aim of catalytic degradation of phenol by modified carbon nitride without light was realized.Furthermore,the modified carbon nitride was characterized by XRD,FTIR,SEM and EDS,which proved the successful doping of Ni between carbon nitride molecules,but the molecular structure of carbon nitride was not changed;and the intermediates and possible degradation paths in the phenol degradation process were determined and analyzed by use of high performance liquid chromatography-mass spectrometry.