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Removal of iodide anions in water by silver nanoparticles supported on polystyrene anion exchanger

Journal of Environmental Sciences 2023年第6期128卷 45-54页

作者： Li Li Su-Juan Yu Rong-Gang Zheng Peng Li Qing-Cun Li Jing-Fu Liu State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Hubei Key Laboratory of Environmental and Health Effects of Persistent Toxic Substances Institute of Environment and HealthJianghan UniversityWuhan 430056China University of Chinese Academy of Sciences Beijing 100049China department of Ecology and Resources Engineering He Tao CollegeInner Mongolia 015000China

The removal of iodide(I^(−))from source waters is an effective strategy to minimize the formation of iodinated disinfection by-products(dBPs),which are more toxic than their brominated and chlorinated analogues.In this work,a nanocomposite ag-d201 was synthesized by multiple in situ reduction of ag-complex in d201 polymer matrix,to achieve highly efficient removal of iodide from water.Scanning electron microscope/energy dispersive spectrometer characterization showed that uniform cubic silver nanoparticles(agNPs)evenly dispersed in the d201 pores.The equilibrium isotherms data for iodide adsorption onto ag-d201 was well fitted with Langmuir isotherm with the adsorption capacity of 533 mg/g at neutral pH.The adsorption capacity of ag-d201 increased with the decrease of pH in acidic aqueous solution,and reached themaximum value of 802 mg/g at pH 2.This was attributed to the oxidization of I^(−),by dissolved oxygen under the catalysis of agNPs,to I2 which was finally adsorbed as agI3.However,the aqueous solutions at pH 7–11 could hardly affect the iodide adsorption.The adsorption of I^(−)was barely affected by real water matrixes such as competitive anions(SO_(4)^(2−),NO_(3)^(−),HCO3−,Cl^(−))and natural organic matter,of which interference of NOM was offset by the presence of Ca^(2+).The proposed synergistic mechanism for the excellent performance of iodide adsorption by the absorbent was ascribed to the donnan membrane effect caused by the d201 resin,the chemisorption of I^(−)by agNPs,and the catalytic effect of agNPs.

关键词： ag-d201 Iodide removal donnan membrane effect Chemisorption Catalytic effect High selectivity

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