Study on the catalytic oxidation of iodine ions by functionalized SiO2 supported phosphomolybdic acid
The transition metal Cu substituted polyoxometalates cluster(PMo11Cu)was immobilized by electro-static force on NH2 functionalized SiO2 with the post-modified method,the resulting composite materials,ab-breviated as PMo11Cu/NH2-SiO2.The structure and composition of catalyst was characterized by XRD,FT-IR,UV-Vis-DRS,SEM,EDX XPS,etc.A study was conducted to investigate the catalytic performances of PMo11 Cu/NH2-SiO2 towards the oxidation of iodine ion.The results showed that at T=25 ℃,c(I-)=2.5 × 10-3 mol/L,c(H2 O2)=2.0 × 10-3 mol/L,pH=2.4,the rate of iodide ion reaction catalyzed by PMo11 Cu/NH2-SiO2 with v=8.87 × 10-6 mol/(L·s),was increased by a factor of 616 over that of the blank experiment and the catalytic activity and stability were maintained in the first 10 cycles were able to maintain excellent catalytic activity and stability.
transition metal replaces phosphomolybdic acidmodified SiO2heterogeneous catalysisiodine ion
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