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Preparation and properties of double-template magnetic molecularly imprinted polymers for removal of nitrophenol from drinking water

用于去除饮用水中硝基酚的双模板磁性分子印迹聚合物的制备及性能

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Abstract

In order to efficiently remove 4-nitrophenol (4-NP) and 2,4-dinitrophenol (2,4-DNP), 4-NP and 2,4-DNP were used as template molecules and double-template magnetic molecularly imprinted polymers (D-MIPs) were prepared by surface molecular imprinting technology using itaconic acid as functional monomer, Fe3O4@SiO2 as carrier, ethylene glycol dimethacrylate as crosslinking agent and azodiisobutyronitrile as initiator. The morphology of D-MIPs was characterized using FT-IR and SEM. The adsorption specificity, regenerability, and applicability of D-MIPs were studied in detail. The results show that D-MIPs successfully coated the surface of the Fe3O4@SiO2 carrier and had a good polymerization effect, specific recognition sites, and good imprinting performance, with a diameter of 90 nm and homogeneous shape. The theoretical adsorption capacities of 4-NP-MIPs, 2, 4-DNP-MIPs, and D-MIPs for target molecules were 103.97, 73.14 and 123.99 mg/g, respectively. There were many adsorption sites with different adsorption energies. D-MIPs reached the optimal adsorption equilibrium state in 30 min. The best fitting models for the MIPs were the Freundlich adsorption and pseudo-second-order kinetic models, indicating that adsorption of MIPs occurred via a chemical adsorption process. Test results show that MIPs had highly specific recognition and selective adsorption capacity in different water samples. After eight regeneration cycles, the adsorption capacity of D-MIPs decreased by 7.51%, confirming that MIPs had excellent regeneration.

摘要

为高效去除4-硝基酚(4-NP)和2,4-二硝基酚(2,4-DNP),本实验采用4-NP 和2,4-DNP 作为模板分子,以衣通酸(IA)为功能单体,磁性纳米氧化铁(Fe3O4@SiO2)为载体,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,偶氮二异丁腈(AIBN)为引发剂,采用表面分子印迹技术制备了双模板磁性分子印迹聚合物(D-MIPs)。利用傅里叶变换红外光谱(FT-IR)和扫描电子显微镜(SEM)对D-MIPs 的形貌进行表征。研究了D-MIPs 的吸附性能、可再生性和适用性。结果表明,D-MIPs 成功地包覆在Fe3O4@SiO2载体表面,聚合效果良好,且具有特异的识别位点和良好的印迹性能,其直径为90 nm,形状均匀。4-NP-MIPs、2,4-DNP-MIPs 和D-MIPs 对目标分子的理论吸附量分别为103.97,73.14 和123.99 mg/g,存在许多不同吸附能的吸附位点。D-MIPs 在30 min 内达到最佳吸附平衡状态,其最佳拟合模型为Freundlich 吸附模型和拟二阶动力学模型,表明其吸附是通过化学吸附过程进行的。实验结果表明,在不同水样中,MIPs 具有高度的特异性识别和选择性吸附能力。经过8 次再生循环后,D-MIPs 的吸附能力仅下降7.51%,证实了MIPs 具有优异的再生性能。

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Authors and Affiliations

  1. Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400045, China

    Yi-wen Ouyang  (欧阳伊雯), Jian-jun Liang  (梁建军) & Xiao-feng Gao  (高小峰)

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  1. Yi-wen Ouyang  (欧阳伊雯)
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  2. Jian-jun Liang  (梁建军)
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  3. Xiao-feng Gao  (高小峰)
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Contributions

OUYANG Yi-wen conducted the literature review and wrote the first draft of the manuscript. LIANG Jian-jun edited the draft of manuscript. GAO Xiao-feng provided the concept and edited the draft of manuscript.

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Correspondence to Xiao-feng Gao  (高小峰).

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OUYANG Yi-wen, LIANG Jian-jun, and GAO Xiao-feng declare that they have no conflict of interest.

Additional information

Foundation item: Project(52200208) supported by the National Natural Science Foundation of China; Project(YJ20200280) supported by the International Postdoctoral Exchange Fellowship Program, China

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Ouyang, Yw., Liang, Jj. & Gao, Xf. Preparation and properties of double-template magnetic molecularly imprinted polymers for removal of nitrophenol from drinking water. J. Cent. South Univ. 31, 138–150 (2024). https://doi.org/10.1007/s11771-024-5565-z

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  • DOI: https://doi.org/10.1007/s11771-024-5565-z

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