摘要
为了进一步研究氮掺杂碳材料活化过硫酸盐降解4-氯苯酚的方法,首先以廉价易得的废弃工业糖浆作为碳源,以氨水作为氮源,利用溶胶-凝胶法合成了3种氮掺杂碳材料(NC-700,NC-800和NC-900),并利用扫描电子显微镜(SEM)、X射线衍射(XRD)、拉曼光谱(Raman)、X射线光电子能谱(XPS)等技术对氮掺杂碳材料进行表征分析;然后考察了NC-800投加量、过硫酸盐(PDS)投加量和初始pH等因素对4-氯苯酚去除率的影响,并进行了电子自旋共振(ESR)和自由基淬灭实验。结果表明:3种材料均可有效活化PDS降解4-氯苯酚,其中NC-800活化PDS去除4-氯苯酚效率最高;当NC-800投加量为100mg/L、PDS投加量为5mmol/L时,反应30min后,50mg/L的4-氯苯酚的总去除率达99.10%;初始pH对4-氯苯酚去除率无明显影响;NC-800活化过硫酸盐降解4-氯苯酚遵循非自由基途径,单线态氧为降解4-氯苯酚的活性物质。循环使用实验证明NC-800具有一定的稳定性,4次循环使用后,4-氯苯酚去除率仍可达到73.80%。
This thesis focuses on the activation of persulfate to degrade 4-chlorophenol by selfdeveloped nitrogen-doped carbon materials.Firstly,three nitrogen doped carbon materials(NCs)(NC-700,NC-800,and NC-900)were synthesized via sol-gel method by using waste industrial syrup as carbon source and ammonia as nitrogen source,which were characterized by the methods of scanning electron microscope(SEM),X-ray diffraction(XRD),Raman spectra(Raman),and X-ray photoelectron spectroscopy(XPS).Then,the effects of NC-800dosage,persulfate(PDS)dosage,and initial pH on the removal rate of 4-chlorophenol were investigated,and electron spin resonance(ESR)and free radical quenching experiments were carried out.It showed that all the three NCs could effectively activate persulfate(PDS)to degrade 4-chlorophenol;and NC-800showed the best ctivation performance;the removal efficiency of 50mg/L 4-chlorophenol reached 99.10%in 30min,when the dosage of NC-800and PDS were 100mg/L and 5mmol/L,respectively;the initial pH had no effects on the removal efficiency of 4-chlorophenol;NC-800activated persulfate degradation of 4-chlorophenol,which followed the non-radical pathway,and the singlet oxygen was the active substance for degrading of 4-chlorophenol.The cycling experiments showed that NC-800has certain stability,and the removal efficiency could still reach to 73.80%after four cycles.
作者
刘娜
张朋朋
丁隆真
陈红
焦昕倩
Liu Na;Zhang Pengpeng;Ding Longzhen;Chen Hong;Jiao Xinqian(College of New Energy and Environment,Jilin University,Changchun 130021,China;Key Laboratory of Groundwater Resources and Environment(Jilin University),Ministry of Education,Changchun 130021,China)
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2020年第4期1173-1181,共9页
Journal of Jilin University：Earth Science Edition
基金
国家自然科学基金项目(41572217)。
关键词
氮掺杂碳材料
4-氯苯酚
过硫酸盐
非自由基途径
单线态氧
nitrogen doped carbon materials
4-chlorophenol
persulfate
non-radical pathway
singlet oxyge
作者简介
刘娜(1977-),女,教授,博士生导师,主要从事环境污染治理与修复研究,E-mail:liuna@jlu.edu.cn。
