磁性壳聚糖负载钒取代磷钼酸催化氧化碘离子性能研究

doi:10.19964/j.issn.1006-4990.2025-0076

摘要/Abstract

摘要：

为解决传统均相多金属氧酸盐催化剂在碘离子氧化反应中存在的分离困难及循环稳定性差的问题，研究开发一种高效可回收的绿色非均相催化剂，以Keggin型钒取代多金属氧酸盐H₄PMo₁₁VO₄₀（简称PMo₁₁V）为活性组分，以磁性纳米颗粒（MNPs）改性壳聚糖（CS）为载体，制备磁性壳聚糖复合催化剂MNPs/CS/PMo₁₁V。利用X射线粉末衍射（PXRD）、傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、X射线能谱仪（EDS）、热重分析（TGA）和振动样品磁强计（VSM）等分析手段对复合材料进行表征。探究复合催化剂催化氧化碘离子（I^-）性能并对其动力学进行分析，实验结果表明，该催化剂与空白相比催化活性提升40倍，其催化反应符合准一级动力学模型。在过氧化氢浓度为2.0×10^-3 mol/L、碘离子浓度为2.5×10^-3 mol/L、反应温度为55 ℃、pH为2.0条件下，碘离子转化率可在80 s达到99.68%。所制备的绿色催化剂可通过外加磁场在30 s内实现快速简单的磁分离和回收，循环再生40次后仍具有良好的催化活性。因此，制备的复合催化剂MNPs/CS/PMo₁₁V具有优异的循环稳定性，能高效催化碘离子生成碘单质，在工业碘回收领域具有一定的应用潜力。

关键词: 多金属氧酸盐, 过渡金属, 壳聚糖, 磁性纳米颗粒, 催化氧化

Abstract:

To solve the problems of difficult separation and insufficient cycle stability of traditional homogeneous polyoxometalate catalysts in iodine ion oxidation reactions， a highly efficient and recyclable green heterogeneous catalyst was developed.The magnetic chitosan composite catalyst MNPs/CS/PMo₁₁V was prepared by using Keggin-type vanadium substituted polyoxometalate H₄PMo₁₁VO₄₀（PMo₁₁V） as the active component and magnetic modified chitosan（CS） as the carrier.The composites were characterized by PXRD（X-ray powder diffraction），FT-IR（Fourier transform infrared spectroscopy），SEM（scanning electron microscope），EDS（X-ray energy dispersive spectrometer），TGA（thermogravimetric analysis），and VSM（vibrating sample magnetometer）.The catalytic oxidation of iodide ion（I^-） was investigated，and the kinetics were analyzed.The experimental results showed that the catalytic activity of the catalyst was 40 times higher than that of the blank，and the catalytic reaction conformed to the quasi-first-order kinetic model.Under the condition of c（H₂O₂）=2.0×10^-3 mol/L，c（I^-）=2.5×10^-3 mol/L，the optimum temperature T=55 °C，pH=2.0，the conversion rate of iodide ion could reach 99.68% in about 80 s.The prepared green catalyst could achieve rapid and simple magnetic separation and recovery within 30 s by applying an external magnetic field， and it still had good catalytic activity after 40 cycles of regeneration.Therefore， the prepared MNPs/CS/PMo₁₁V had excellent cycle stability and could efficiently catalyze iodine ions to produce iodine， which had certain application potential in industrial iodine recovery.

Key words: polymetallic oxides, transition metals, chitosan, magnetic nanoparticles, catalytic oxidation

中图分类号:

O643.36

窦红红, 郭军, 杨帆, 陈国强, 夏子月. 磁性壳聚糖负载钒取代磷钼酸催化氧化碘离子性能研究[J]. 无机盐工业, 2026, 58(2): 108-116.

DOU Honghong, GUO Jun, YANG Fan, CHEN Guoqiang, XIA Ziyue. Study on catalytic oxidation of iodide ions by magnetic chitosan loaded with vanadium-substituted phosphomolybdic acid[J]. Inorganic Chemicals Industry, 2026, 58(2): 108-116.

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催化剂	催化剂质量/g	碘离子转化率/%
空白	0	1.61
PMo₁₂	0.10	94.10
PMo₁₁V	0.10	97.70
MNPs/CS/PMo₁₁V	0.42	66.43

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