新型树脂基水合锰氧化物对水体中磺胺嘧啶的降解去除

以大孔强碱阴离子交换树脂D201为载体, 采用离子交换和氧化还原方法制备了一种新型树脂基水合锰氧化物材料HMO-201. 考察了不同pH、 离子强度和溶解性有机质(DOM)含量条件下, 该材料对水体中磺胺嘧啶(SD)的去除能力. HPLC-MS分析表明, SD的高效去除是通过HMO-201的降解而非吸附方式实现的. 实验结果表明, pH为1.0时HMO-201在120 min内对0.01 mmol/L SD的去除效率为99.9%, 反应符合表观一级动力学模型; 体系的离子强度和DOM含量变化对SD的去除效率均无显著影响. 模拟环境离子强度和DOM浓度, 连续10批次实验中SD废水的去除效率在240 min内均大于99%; HMO-201的柱动态降解装置连续处理SD溶液2000床体积, 依然未检出SD. 表明HMO-201材料具有较稳定的重复利用性, 对环境中普遍存在的磺胺类抗生素药物具有着高效的降解去除效果, 具有广泛的应用前景.

Degradation and Removal of Sulfadiazine from Waters by a Novel Polymer-supported Hydrous Manganese Dioxide(HMO)

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.