摘要
以双氰胺、草酸二水合物、五水合硝酸铋、氯化铵为主要原料,通过煅烧-溶剂热-煅烧法制备了氮氧共掺杂g-C_(3)N_(4)/BiOCl异质结材料Bi_(9)O_(13.5)Cl_(2)-N/O/g-C_(3)N_(4)(NOBCN),将其用于光催化降解水体中盐酸四环素(TCH)。采用SEM、FTIR、EDS、XRD、XPS、BET对其进行了表征,考察了溶液pH、共存离子对NOBCN光催化降解TCH性能的影响,探究了N、O掺杂对NOBCN光催化性能提升的原因,推测了其机理。结果表明,料液比(g∶L,催化剂质量和TCH溶液体积之比,下同)为0.5∶1的NOBCN在120 min时对初始质量浓度为5 mg/L的TCH降解率为98.4%。在pH=7或9时,NOBCN在120 min内对TCH的降解率可达100%。NOBCN以薄片花瓣的形式围绕成花朵形状,含氧官能团的增加提高了NOBCN的光催化降解TCH性能。NOBCN经5次循环使用后,TCH降解率仍可达到79.6%,具有出色的环境适应能力。羟基自由基和超氧自由基为NOBCN光催化降解TCH的活性物种。
O and N co-doped heterojunction material Bi_(9)O_(13.5)Cl_(2)-N/O/g-C_(3)N_(4)(NOBCN)was prepared from dicyandiamide,oxalate dihydrate,bismuth nitrate pentahydrate and ammonium chloride by calcination-solvothermal calcination method,characterized by SEM,FTIR,EDS,XRD,XPS and BET,and used for photocatalytic degradation of tetracycline hydrochloride(TCH)in water.The effects of solution pH and co-existing ions on NOBCN photocatalytic degradation of TCH were evaluated,while the reasons for the enhancement of NOBCN photocatalytic performance by N and O co-doping were explored,and the mechanism was speculated.The results indicated that the NOBCN with a solid-liquid ratio(g∶L,the ratio of catalyst mass to TCH solution volume,the same below)of 0.5∶1 showed 98.4%degradation rate for TCH with an initial mass concentration of 5 mg/L at 120 min.When pH=7 or 9,the degradation rate of NOBCN for TCH could reach 100%within 120 min.NOBCN was formed into a flower shape in the form of thin petals,and the photocatalytic degradation of TCH by NOBCN was improved with the increase of oxygen-containing functional groups.After NOBCN was cycled for 5 time,the degradation rate of TCH could still reach 79.6%,indicating excellent environmental adaptability.Hydroxyl radical and superoxide radical were active species in NOBCN photocatalytic degradation of TCH.
作者
裴晓龙
杨琦
杨智临
PEI Xiaolong;YANG Qi;YANG Zhilin(Department of Ecology and Environment,Shaanxi Provincial Environmental Monitoring Center,Xi'an 710054,Shaanxi,China;China Institute of Environmental Studies,Beijing 100012,China;MOE Key Laboratory of Groundwater Circulation and Environmental Evolution,China University of Geosciences(Beijing),Beijing 100083,China)
出处
《精细化工》
北大核心
2025年第10期2262-2271,共10页
Fine Chemicals
基金
陕西省环境介质痕量污染物监测预警重点实验室开放基金项目(3-4-2024-008)。
关键词
盐酸四环素
石墨氮化碳
氯氧铋
光催化
异质结
水处理技术
tetracycline hydrochloride
graphite carbon nitride
bismuth oxychloride
photocatalysis
heterojunction
water treatment technology
