摘要
以尿素为原料,采用热聚合法合成光催化剂石墨相氮化碳(g-C_(3)N_(4)),并研究其光催化剂性能。通过X射线衍射仪(XRD)、自带能谱分析的扫描电镜(SEM-EDS)、傅里叶红外光谱仪(FT-IR)、热重分析仪(TG/DTG)和紫外-可见分光光度计(UV-Vis DRS)等对光催化剂的结构、形貌、表面官能团、热稳定和光学性能进行表征分析。考察了g-C_(3)N_(4)的合成温度、g-C_(3)N_(4)质量浓度、过硫酸钠(SPS)质量浓度、酮洛芬(KTP)初始质量浓度、溶液初始pH、降解时间及催化剂循环使用次数等因素对光催化降解KTP的影响。结果表明,500℃合成的g-C_(3)N_(4)呈片状多孔纳米结构,具有最佳的光催化性能;在光照功率为35 W、pH为9、SPS初始质量浓度为1.20 g/L、g-C_(3)N_(4)质量浓度为1.00 g/L、降解时间为150 min时,初始质量浓度为2 mg/L的KTP的降解率为96.84%;催化剂经回收连续使用5次,可将初始质量浓度为2 mg/L的KTP溶液光催化降解至100μg/L,可满足回用水要求。
Photocatalyst g-C_(3)N_(4)is synthesized by thermal polymerization with urea as raw material,and its photocatalytic properties are investigated.The structure,morphology,surface functional groups,thermal stability and optical properties of the samples are characterized and analyzed by means of XRD,SEM-EDS,FT-IR,TG/DTG and UV-Vis DRS.Furthermore,the effects of factors including synthesis temperature of g-C_(3)N_(4),dosage of g-C_(3)N_(4),initial concentration of sodium persulfate,initial concentration of ketoprofen,initial pH of solution,degradation time and cycle number of photocatalyst on photocatalytic degradation of ketoprofen are studied.The results show that g-C_(3)N_(4)synthesized at 500℃exhibits lamellar porous nanostructures and has the best photocatalytic property.The degradation rate of ketoprofen with an initial concentration of 2 mg·L^(-1)reaches 96.84%when initial pH of solution is 9,initial concentration of sodium persulfate is 1.2 g·L^(-1),mass concentration of g-C_(3)N_(4)is 1.00 g·L^(-1),degradation time is 150 min and the lighting power is 35 W.Even g-C_(3)N_(4)photocatalyst has been recycled and continuously used for 5 times,it can still degrade ketoprofen with an initial concentration of 2 mg·L^(-1)to 100μg·L^(-1),therefore makes the treated water meet the requirements of the company.
作者
刘嘉琪
陈锦华
陈爽
易继勇
刘清霞
刘志雄
LIU Jia-qi;CHEN Jin-hua;CHEN Shuang;YI Ji-yong;LIU Qing-xia;LIU Zhi-xiong(College of Physics and Electromechanical Engineering,Jishou University,Jishou 416000,China;College of Biology and Environmental Sciences,Jishou University,Jishou 416000,China;Collaborative Innovation Center for Manganese-Zinc-Vanadium Industrial Technology(The 2011 Plan of Hunan Province),Jishou University,Jishou 416000,China;Hunan Province Key Laboratory of Mineral Cleaner Production and Green Functional Materials,Jishou University,Jishou 416000,China)
出处
《现代化工》
CAS
CSCD
北大核心
2023年第6期193-199,共7页
Modern Chemical Industry
基金
湖南省自然科学基金资助项目(2020JJ4507,2020JJ5456)
湖南省教育厅科学研究重点资助项目(19A413)
矿物清洁生产与绿色功能材料开发湖南省重点实验室开放基金资助项目(KWCL202001)
吉首大学研究生校级科研项目(JDY21026)。
