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

doi:10.16085/j.issn.1000-6613.2022-1647

Abstract

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 I₂adsorption 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

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

CLC Number:

TQ424.3

YU Jingwen, SONG Luna, LIU Yanchao, LYU Ruidong, WU Mengmeng, FENG Yu, LI Zhong, MI Jie. An indole-bearing hypercrosslinked polymer In-HCP for iodine adsorption from water[J]. Chemical Industry and Engineering Progress, 2023, 42(7): 3674-3683.

于静文, 宋璐娜, 刘砚超, 吕瑞东, 武蒙蒙, 冯宇, 李忠, 米杰. 一种吲哚基超交联聚合物In-HCP对水中碘的吸附作用[J]. 化工进展, 2023, 42(7): 3674-3683.

Figures/Tables 14

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吲哚基超交联聚合物	吲哚、FDA和FeCl₃摩尔比	反应温度和时间	干燥方式	比表面积/ m²·g^-1
IN	1∶3∶3	80℃，18h	真空干燥	243
PIN	1∶2∶2	80℃，18h	CO₂超临界干燥	490

吲哚基超交联聚合物	吲哚、FDA和FeCl₃摩尔比	反应温度和时间	干燥方式	比表面积/ m²·g^-1
IN	1∶3∶3	80℃，18h	真空干燥	243
PIN	1∶2∶2	80℃，18h	CO₂超临界干燥	490

吸附剂	准二级动力学模型			颗粒内扩散动力学模型
	准二级动力学模型			第一阶段			第二阶段
	q_e,_cal/g·g^-1	k₂/g·g^-1·min^-1	R²	k_p/g·g^-1·min^-0.5	C/g·g^-1	R²	k_p/g·g^-1·min^-0.5	C/g·g^-1	R²
In-HCP	0.586	4.169	0.99994	0.05362	0.40918	0.85887	0.00391	0.55686	0.88358
AC	0.562	5.164	0.99996	0.02223	0.47633	0.94975	0.00578	0.52570	0.89894

吸附剂	准二级动力学模型			颗粒内扩散动力学模型
	准二级动力学模型			第一阶段			第二阶段
	q_e,_cal/g·g^-1	k₂/g·g^-1·min^-1	R²	k_p/g·g^-1·min^-0.5	C/g·g^-1	R²	k_p/g·g^-1·min^-0.5	C/g·g^-1	R²
In-HCP	0.586	4.169	0.99994	0.05362	0.40918	0.85887	0.00391	0.55686	0.88358
AC	0.562	5.164	0.99996	0.02223	0.47633	0.94975	0.00578	0.52570	0.89894

吸附剂	消耗NaHSO₃溶液体积/mL	滤液中I₂质量/mg	被吸附I₂质量/mg
In-HCP	15.50	196.7	103.3
AC	18.60	236.0	64.0