高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (7): 1241-1248.doi: 10.7503/cjcu20160863

• 物理化学 • 上一篇    下一篇

表面改性活性炭活化过硫酸盐降解苯酚

刘子乐1,2, 曾泽泉2, 杨洁杨2, 崔燕2, 武爱莲1, 李哲1(), 黄张根2()   

  1. 1. 太原理工大学化学化工学院, 太原 030024
    2. 中国科学院山西煤炭化学研究所, 煤转化国家重点实验室, 太原 030001
  • 收稿日期:2016-11-30 出版日期:2017-07-10 发布日期:2017-05-18
  • 作者简介:联系人简介: 李 哲, 男, 博士, 教授, 主要从事多相催化方面的研究. E-mail: lizhe@tyut.edu.cn; 黄张根, 男, 博士, 研究员, 主要从事燃煤烟气净化和污水处理方面的研究. E-mail: zghuang@sxicc.ac.cn
  • 基金资助:
    国家自然科学基金(批准号: 21507140)和山西省青年科技基金(批准号: 2014021016-3)资助

Degradation of Phenol with Persulfate Activated by Surface Modified Activated Carbon

LIU Zile1,2, ZENG Zequan2, YANG Jieyang2, CUI Yan2, WU Ailian1, LI Zhe1,*(), HUANG Zhanggen2,*()   

  1. 1. College of Chemistry and Chemical Engineering,Taiyuan University of Technology, Taiyuan 030024, China
    2. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry,Chinese Academy of Sciences, Taiyuan 030001, China
  • Received:2016-11-30 Online:2017-07-10 Published:2017-05-18
  • Contact: LI Zhe,HUANG Zhanggen E-mail:lizhe@tyut.edu.cn;zghuang@sxicc.ac.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.21507140) and the Youth Scientific and Technological Foundation of Shanxi Province, China(No.2014021016-3)

摘要:

采用硝酸氧化联合高温处理法对活性炭(AC)进行表面改性(样品记为ACNH), 并将其用于活化过硫酸盐(PS)降解苯酚. 通过氮气等温吸附、 元素分析、 X射线光电子能谱和扫描电子显微镜等手段对改性前后活性炭的表面性质进行了表征分析. 考察了活性炭投加量、 PS/苯酚摩尔比、 苯酚初始浓度和初始pH等条件对苯酚降解率的影响. 结果表明, 改性后活性炭活化PS能力显著提高, 在ACNH/PS体系中苯酚的降解速率是AC0/PS体系中的5倍; ACNH 的pH值适用范围宽; 活性炭表面醌基、 吡喃酮结构和碳原子平面层上的离域π电子(Cπ)在活化PS过程中起主要作用, 而羧基起抑制作用.

关键词: 表面改性, 活性炭, 过硫酸盐, 含氧官能团, 碱性位点

Abstract:

Original activated carbon(AC0) was modified through nitric acid treatment followed by thermal annealing, as a result, ACNH was obtained. The activated carbon samples(ACs) were used to activate persulfate(PS) for phenol degradation. The ACs before and after modification were characterized by means of nitrogen adsorption isotherm, element analysis, X-ray photoelectron spectroscopy(XPS) and scanning electron microscopy(SEM). Moreover, the effects of the operating conditions, including the dosage of ACNH, PS/phenol mole ratio, the initial concentration of phenol and initial pH, on the phenol degradation in ACNH/PS system were also investigated. The results showed that the catalytic activity of activated carbon for PS activation was significantly enhanced after the modification, and the degradation rate of phenol in ACNH/PS system was 5 times faster than that in AC0/PS system. In addition, it was found that ACNH can be applicable to a wide pH range . The results also showed that Cπ, quinone and pyrone have a positive effect on the activation of PS while the carboxyl has an opposite effect.

Key words: Surface modification, Activated carbon, Persulfate, Oxygen-containing functional group, Basic site

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