Preparation and adsorption performance research of mercury(Ⅱ)ion-imprinted polymer
Hg(Ⅱ)as the template ion,allyl thiourea as a functional monomer,N,N-dimethylformamide as crosslinker,methanol as solvent,and scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),specific surface area(BET),infrared spectroscopy(FT-IR),investigated the morphology,chemical components of Hg-IIP and the adsorption characteristics of Hg(Ⅱ),and studied the treatment effect of actual sludge and river sediment.The results showed that the average particle size of Hg-IIP was 250 nm,with a specific surface area of 99.762 m2·g-1.The maximum saturated adsorption capacity of Hg-IIP for Hg(Ⅱ)was 62.92 mg g-1,and adsorption equilibrium could be reached within 3 hours.The adsorption process followed the Langmuir model and quasi second order kinetic model,indicating that the adsorption of Hg(Ⅱ)by Hg-IIP was mainly single-layer adsorption with chemical adsorption.During the adsorption process,there was little pH interference,and even in the presence of multiple heavy metal ions,Hg-IIP still had a good adsorption effect on Hg(Ⅱ).Applied to actual samples,the removal rate of mercury in sludge can reach 90％.This study provides important methodological basis for subsequent research on the removal of mercury from sludge.
ion imprinting technologymercury ion printing polymeradsorption performancesludge
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