化工进展 ›› 2021, Vol. 40 ›› Issue (7): 4036-4046.DOI: 10.16085/j.issn.1000-6613.2020-1551

• 资源与环境化工 • 上一篇    下一篇

改性聚吡咯材料去除水中氟离子的性能

冯江涛1(), 王睎1, 赵旭阳1, 龚向红2, 延卫1()   

  1. 1.西安交通大学能源与动力工程学院环境工程系,陕西 西安 710049
    2.义乌市水处理有限责任公司,浙江 义乌 322000
  • 收稿日期:2020-08-05 修回日期:2020-09-24 出版日期:2021-07-06 发布日期:2021-07-19
  • 通讯作者: 延卫
  • 作者简介:冯江涛(1981—),男,博士,副教授,研究方向为新型吸附材料。E-mail:fjtes@xjtu.edu.cn
  • 基金资助:
    国家自然科学基金面上项目(51978569)

Removal of fluoride from water by modified polypyrrole

FENG Jiangtao1(), WANG Xi1, ZHAO Xuyang1, GONG Xianghong2, YAN Wei1()   

  1. 1.Department of Environmental Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China
    2.Yiwu Water Treatment Co. , Ltd. , Yiwu 322000, Zhejiang, China
  • Received:2020-08-05 Revised:2020-09-24 Online:2021-07-06 Published:2021-07-19
  • Contact: YAN Wei

摘要:

通过控制合成条件和在聚合过程中分别引入酸性红G(ARG)、甲基橙(MO)、α-环糊精(α-CD)和甲基橙等掺杂剂合成了表面带有毛刺的纤维、不同直径纳米纤维编织成的微米片状特殊微形貌的改性聚吡咯(PPy)材料。通过场发射扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶变换红外光谱分析(FTIR)、氮气吸脱附分析(BET)、zeta电位分析等方法对其物理化学性能进行了表征,并将其应用于水体低浓度氟离子的吸附去除,比较了改性聚吡咯材料与传统方法合成的颗粒状聚吡咯对氟离子吸附的性能。结果表明:改性的特殊微形貌PPy的比表面积比传统颗粒状PPy提高了7~10倍;在常温和pH=5的条件下,F-初始浓度在3~5mg/L,投加量为2g/L时,改性的特殊微形貌PPy可在10min之内达到吸附平衡,并将F-的浓度降低到国家《生活引用水卫生标准》(GB 5749—2006)规定的1mg/L以下,说明特殊微形貌的控制对PPy吸附F-具有很大影响。另外,该吸附行为是自发的放热过程,Langmiur模型可以很好地拟合该吸附过程,PPy对F-的去除主要涉及离子交换作用。

关键词: 聚吡咯, 氟离子, 吸附, 特殊微形貌

Abstract:

Modified polypyrrole (PPy) nanofibers with different diameters were synthesized by controlling the synthesis conditions and adding ARG, MO and α-CD+MO in the polymerization process, respectively. The physicochemical properties of the as-prepared PPy were characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy(FTIR), nitrogen adsorption desorption analysis (BET) and zeta potential analysis. The results showed that the specific surface area of PPy with special morphology was 7—10 times higher than that of traditional granular PPy. Compared with traditional granular PPy, the modified PPy with special morphology can reach the adsorption equilibrium within 10 min at room temperature and pH=5 when the initial concentration of F- was 3—5mg/L and the dosage was 2g/L. The concentration of F- can be reduced to less than 1mg/L in the Integrated Wastewater Discharge Standard (GB 5749—2006). The results indicated that the control of special morphology had a great influence on the adsorption of F- by PPy. In addition, the adsorption behavior was a spontaneous exothermic process, which can be well fitted by Langmuir model. The removal of F- by PPy was mainly the result of ion exchange.

Key words: polypyrrole (PPy), fluorine ion, adsorption, special morphology, mechanism

中图分类号: 

京ICP备12046843号-2;京公网安备 11010102001994号
版权所有 © 《化工进展》编辑部
地址:北京市东城区青年湖南街13号 邮编:100011
电子信箱:hgjz@cip.com.cn
本系统由北京玛格泰克科技发展有限公司设计开发 技术支持:support@magtech.com.cn