Abstract
A new polymer-supported hydrous manganese dioxide(HMO-201) was prepared by impregnating HMO onto a porous polystyrene anion exchange resin(D201) through ion exchange,oxidation and reduction.The removal of sulfadiazine(SD) by HMO-201 was evaluated as a function of solution pH,background electrolyte NaCl and dissolved organic matter(DOM).HPLC-MS results showed that the removal of SD by HMO-201 was due to degradation rather than adsorption.The results indicated that the removal of 0.01 mmol/L SD reached 99.9% at pH=1.0 within 120 min.The SD degradation followed the pseudo-first-order kinetics.SD removal efficiency was little affected by ionic strength and DOM.With simulated SD wastewater containing NaCl and DOM,SD removal efficiency remained above 99% within 240 min for up to ten batches of continuous operation.Fixed-bed column experiment results of HMO-201 showed that SD remained undetected after 2000 bed volume simulated SD wastewater was passed through the column.HMO-201 was effective for the removal of sulfonamide antibiotics commonly found in the environment.It could be reused without a significant loss of capacity and thus has a great potential of real-world applications.
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