氮掺杂碳材料活化过硫酸盐降解4-氯苯酚

doi:10.13278/j.cnki.jjuese.20190060

摘要/Abstract

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100 mg/L、PDS投加量为5 mmol/L时，反应30 min后，50 mg/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%。

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

Abstract: This thesis focuses on the activation of persulfate to degrade 4-chlorophenol by self-developed 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-800 dosage, 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-800 showed the best ctivation performance; the removal efficiency of 50 mg/L 4-chlorophenol reached 99.10 % in 30 min, when the dosage of NC-800 and PDS were 100 mg/L and 5 mmol/L, respectively; the initial pH had no effects on the removal efficiency of 4-chlorophenol; NC-800 activated 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-800 has certain stability, and the removal efficiency could still reach to 73.80 % after four cycles.

Key words: nitrogen doped carbon materials, 4-chlorophenol, persulfate, non-radical pathway, singlet oxyge

中图分类号:

X703

刘娜, 张朋朋, 丁隆真, 陈红, 焦昕倩. 氮掺杂碳材料活化过硫酸盐降解4-氯苯酚[J]. 吉林大学学报(地球科学版), 2020, 50(4): 1173-1181.

Liu Na, Zhang Pengpeng, Ding Longzhen, Chen Hong, Jiao Xinqian. Nitrogen-Doped Carbon Material Activate Persulfate to Degrade 4-Chlorophenol[J]. Journal of Jilin University(Earth Science Edition), 2020, 50(4): 1173-1181.

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