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

Abstract

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

CLC Number:

O643.36

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

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on catalytic oxidation of iodide ions by magnetic chitosan loaded with vanadium-substituted phosphomolybdic acid

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