化工进展 ›› 2023, Vol. 42 ›› Issue (7): 3674-3683.DOI: 10.16085/j.issn.1000-6613.2022-1647

• 材料科学与技术 • 上一篇    下一篇

一种吲哚基超交联聚合物In-HCP对水中碘的吸附作用

于静文1,2(), 宋璐娜3, 刘砚超4, 吕瑞东2, 武蒙蒙1(), 冯宇1, 李忠1, 米杰1()   

  1. 1.太原理工大学省部共建煤基能源清洁高效利用国家重点实验室/煤科学与技术教育部和山西省重点实验室,山西 太原 030024
    2.潞安化工集团有限公司,山西 长治 046204
    3.山西能源学院,山西 晋中 030600
    4.太原理工大学化学工程与技术学院,山西 太原 030024
  • 收稿日期:2022-09-06 修回日期:2022-11-18 出版日期:2023-07-15 发布日期:2023-08-14
  • 通讯作者: 武蒙蒙,米杰
  • 作者简介:于静文(1988—),男,博士研究生,研究方向为有机合成方法学和多孔有机聚合物的设计、合成及应用。E-mail:469165514@qq.com
  • 基金资助:
    国家自然科学基金(21978188);山西省自然科学基金青年科学基金(20210302123191);山西省高等学校科技创新项目(2022L602)

An indole-bearing hypercrosslinked polymer In-HCP for iodine adsorption from water

YU Jingwen1,2(), SONG Luna3, LIU Yanchao4, LYU Ruidong2, WU Mengmeng1(), FENG Yu1, LI Zhong1, MI Jie1()   

  1. 1.State Key Laboratory of Clean and Efficient Coal Utilization/Key Laboratory of Coal Science and Technology of Shanxi Province and Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
    2.Lu’an Chemical Group Co. , Ltd. , Changzhi 046204, Shanxi, China
    3.Shanxi Institute of Energy, Jinzhong 030600, Shanxi, China
    4.College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
  • Received:2022-09-06 Revised:2022-11-18 Online:2023-07-15 Published:2023-08-14
  • Contact: WU Mengmeng, MI Jie

摘要:

通过傅-克烷基化反应合成了一种原料低廉、工艺简单、比表面积大、可循环利用的吲哚基超交联聚合物(In-HCP),并将其用于I2的水相吸附。为评估In-HCP的I2捕获能力,与活性炭(AC)进行了比较。I2饱和水溶液的吸附动力学实验表明,In-HCP和AC对I2的吸附行为符合准二级动力学模型,吸附速率受液膜扩散和颗粒内扩散的共同影响。两种材料对I2的吸附在30min内达到平衡状态,AC对I2的吸附较快,但吸附饱和时In-HCP对I2的清除率(94.68%)高于AC(91.56%)。利用滴定法对高浓度KI3水溶液的吸附结果进行了验证,In-HCP的I2吸附量(2.066g/g)为AC(1.280g/g)的1.6倍,经5次循环实验后吸附量仍能达到1.762g/g,表明In-HCP有较好的循环使用性能。通过拉曼光谱和紫外-可见吸收光谱研究了吸附机理, 证明吸附过程是以化学吸附为主。

关键词: 吲哚, 超交联聚合物, 碘, 水溶液, 吸附

Abstract:

An indole-containing hypercrosslinked polymer (In-HCP), featuring cheap raw materials, simple operation, large specific surface area and recyclability, was synthesized via Friedel-Crafts alkylation reaction and then applied for iodine adsorption in aqueous solution. In order to assess the I2 capture ability of In-HCP, activated carbon (AC) was used for comparison. The adsorption kinetics experiments in saturated I2 aqueous solution showed that the I2 adsorption behaviors of In-HCP and AC were fitted with pseudo-second-order kinetic model. The adsorption rate was influenced by both liquid-film diffusion and intra-particle diffusion. The I2 adsorption by both materials could reach equilibrium within 30min. The adsorption rate of AC was faster, however, the removal rate of I2 on In-HCP (94.68%) exceeded that of AC (91.56%) when the adsorption reached saturation state. The sorption results of KI3 high-concentration aqueous solution were validated by titrimetric analysis. The I2 uptake capacity of In-HCP (2.066g/g) was 1.6-fold higher than that of AC (1.280g/g). The adsorption capacity of 1.762g/g was still remained after 5 cycles of experiments, indicating a good recycling performance of In-HCP. The adsorption mechanism was studied by Raman spectrum and UV-Vis absorption spectrum, demonstrating that the process was dominated by chemisorption.

Key words: indole, hypercrosslinked polymer, iodine, aqueous solution, adsorption

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