研究报告

  • 王挺,徐坤苗,吴礼光,陈华丽.基于地下水中四环素去除的缓释剂构建及其性能[J].环境科学学报,2022,42(6):167-177

  • 基于地下水中四环素去除的缓释剂构建及其性能
  • The preparation and characteristics of controlled-release materials for tetracycline degradation in groundwater
  • 基金项目:国家自然科学基金资助项目(No. 42077178,21776250)
  • 作者
  • 单位
  • 王挺
  • 浙江工商大学环境科学与工程学院,杭州 310012
  • 徐坤苗
  • 浙江工商大学环境科学与工程学院,杭州 310012
  • 吴礼光
  • 浙江工商大学环境科学与工程学院,杭州 310012
  • 陈华丽
  • 浙江工商大学环境科学与工程学院,杭州 310012
  • 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-MnOx)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-MnOx与H2O2和Na2S2O8构建的两种类芬顿催化反应体系,明确了O-MnOx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-MnOx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-MnOx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-MnOx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-MnOx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-MnOx) 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-MnOx were confirmed by two kinds of Fenton Catalytic reaction systems composed of ordered O-MnOx, H2O2 and Na2S2O8. The CRMs with O-MnOx and Na2S2O8 as active components can slowly release persulfate ions in groundwater. The higher of O-MnOx content, the slower of the release rate of persulfate. The Na2S2O8 addition enhanced the persulfate rate. O-MnOx 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-MnOx in CRMs can activate persulfate for a long time. After 12 days, the removal rate of tetracycline in groundwater can reach more than 95%.

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