光催化铁掺杂石墨相氮化碳活化过硫酸盐处理酚类废水的研究  

Study on photocatalytic treatment of phenolic wastewater by iron-doped graphite phase carbon nitride activated persulfate

作　　者：左一帆 马会强[1] 李爽[1] 李聪 Zuo Yifan;Ma Huiqiang;Li Shuang;Li Cong(College of Environmental and Safety Engineering,Liaoning Shihua University,Fushun 113001)

机构地区：[1]辽宁石油化工大学环境与安全工程学院,抚顺113001

出　　处：《化工新型材料》2023年第4期269-274,共6页New Chemical Materials

基　　金：辽宁省“兴辽英才计划”项目(XLYC2007007)。

摘　　要：以九水合硝酸铁[Fe(NO_(3))_(3)·9H_(2)O]和三聚氰胺为原料,采用热聚合法制备Fe-C_(3)N_(4),通过X射线衍射、X射线光电子能谱对其进行表征。考察了光催化Fe-C_(3)N_(4)活化过硫酸钠(PS)去除苯酚的效果,并对铁掺杂石墨相氮化碳的制备条件进行了优选。结果表明:Fe-C_(3)N_(4)中存在Fe—N键,铁掺杂成功且合成良好,无任何杂质。相对于单独PS和g-C_(3)N_(4)+PS,Fe-C_(3)N_(4)+PS共同作用可高效去除苯酚,去除率可达到88.2%,苯酚去除效果随催化剂投加量的增大而提高。同时在过硫酸钠与苯酚的摩尔比为100∶1,Fe-C_(3)N_(4)催化剂浓度为2g/L,同时反应全程放置于250W高压钠灯下同步照射的条件下,Fe-C_(3)N_(4)焙烧温度580℃,焙烧时间4h,铁掺杂量5%时,体系对苯酚的去除率最高,反应240min达到97.4%。因此,铁掺杂g-C_(3)N_(4)明显改善了g-C_(3)N_(4)对可见光的利用率,对优化苯酚废水去除的效果明显。Fe-C_(3)N_(4) was prepared by thermal polymerization with iron nitrate 9 hydrate [Fe(NO_(3))_(3)·9H_(2)O] and melamine as raw materials,and characterized by X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS).The removal effect of phenol by photocatalytic Fe-C_(3)N_(4) activated sodium persulfate(PS) was investigated,and the preparation conditions of Fe-doped graphite phase carbon nitride were optimized.The results showed that Fe—N bond existed in the prepared material Fe-C_(3)N_(4),the iron doping was successful,and the synthesis was good without any impurities.Compared with PS alone and g-C_(3)N_(4)+PS,Fe-C_(3)N_(4)+PS could effectively remove phenol,and the removal rate could reach 88.2%.The removal efficiency of phenol increased with the increase of catalyst dosage.Meanwhile,when the mole ratio of sodium persulfate to phenol was 100∶1,the concentration of Fe-C_(3)N_(4) catalyst was 2g/L,and the reaction was placed in 250W high pressure sodium lamp under synchronous irradiation,the roasting temperature of Fe-C_(3)N_(4) preparation was 580℃,the roasting time was 4h,and the iron doping ratio was 5%,the system presented the highest removal rate of phenol,reaching 97.4% at 240min.The Fe-doped g-C_(3)N_(4) significantly improved the utilization rate of g-C_(3)N_(4) to visible light,and had an obvious effect on the optimization of phenol wastewater removal.

关 键 词：Fe-C_(3)N_(4)催化剂 光催化 过硫酸盐 苯酚 

分 类 号：X524[环境科学与工程—环境工程]