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研究报告

The preparation and characteristics of controlled-release materials for tetracycline degradation in groundwater

摘要：为了有效去除地下水中抗生素等有机污染物，本文首次提出有序介孔氧化锰（O-MnO_x）为活性催化剂和过硫酸钠（Na₂S₂O₈）为氧化剂制备活化过硫酸钠缓释剂，并将其用于地下水中四环素的降解修复过程.通过有序O-MnO_x与H₂O₂和Na₂S₂O₈构建的两种类芬顿催化反应体系，明确了O-MnO_x对过硫酸钠的活化及其对水中四环素优异的降解性能.以O-MnO_x与Na₂S₂O₈为活性组分制备的缓释剂在地下水中可以缓慢释放过硫酸根离子.缓释剂中O-MnO_x加入比例增加，其释放性能减弱，而Na₂S₂O₈加入比例减少，过硫酸根释放速率就会加快.O-MnO_x可以活化过硫酸根溶出硫酸根自由基，进而有效降解地下水中的四环素.对于低浓度四环素的地下水（≤10 mg·L^-1），缓释剂在1 d之内对其去除率可以达到95%以上.对于地下水中高浓度的四环素（40 mg·L^-1），缓释剂中O-MnO_x可以长时间催化激活过硫酸根，12 d后缓释剂对地下水中四环素的去除率可达95%以上.

Abstract：In order to effectively remove antibiotics and other organic pollutants in groundwater， activated sodium persulfate controlled-release materials （CRMs） was prepared with ordered mesoporous manganese oxide （O-MnO_x） as active catalyst and sodium persulfate （Na₂S₂O₈） as active oxidant， and was applied to the degradation and remediation of tetracycline in groundwater. The activation of sodium persulfate and the excellent degradation of tetracycline in water by O-MnO_x were confirmed by two kinds of Fenton Catalytic reaction systems composed of ordered O-MnO_x， H₂O₂ and Na₂S₂O₈. The CRMs with O-MnO_x and Na₂S₂O₈as active components can slowly release persulfate ions in groundwater. The higher of O-MnO_x content， the slower of the release rate of persulfate. The Na₂S₂O₈ addition enhanced the persulfate rate. O-MnO_x can activate persulfate to dissolve sulfate radical， and then effectively degrade tetracycline in groundwater. For the groundwater with low concentration of tetracycline （≤10 mg·L^-1）， the removal rate of tetracycline can reach more than 95% in one day. For high concentration of tetracycline （40 mg·L^-1） in groundwater， O-MnO_x in CRMs can activate persulfate for a long time. After 12 days， the removal rate of tetracycline in groundwater can reach more than 95%.

Key words：In-situ groundwater remediation ordered mesoporous manganese oxide persulfate activation tetracycline