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研究报告

占鹏,胡锋平,朱建华,王晓英,龙兰兰,彭小明.Fe-Cu/N共掺杂的ZIFs衍生材料活化过硫酸盐降解四环素[J].环境科学学报,2022,42(3):187-196

ZIFs derived carbon-based materials activate persulfate to degrade organic pollutants

基金项目：国家自然科学基金项目（No.61872141）；江西饮用水安全重点实验室（No.20192BCD40013）；江西省水利厅科技项目（No.202123YBKT27，202223YBKT44）；江西省教育厅重点科技项目（No.GJJ215902）；江西省研究生创新专项资金项目（No.YC2020-B1143）

摘要：通过水热法制备了一种Fe、Cu双金属和N共掺杂的介孔催化材料FeCu-N-C，对其进行表征分析；开展FeCu-N-C活化过硫酸盐（PS）降解四环素（TC）的研究，考察了FeCu-N-C投加量、TC浓度、PS浓度、pH和离子强度等因素对降解效果的影响.结果表明：在催化剂投加量为0.4 g·L^-1，TC初始浓度为40 mg·L^-1，PS 浓度为0.08 g·L^-1，pH=8时TC的降解效果最佳，降解率高达90.5%；利用XPS分析得出复合材料FeCu-N-C的可能主要催化活性位点是Fe-N_x、Cu-N_x；C₂O₄^2-和CO₃^2-的存在相较于Cl^-或NO₃^-，对TC的降解有更大程度的抑制作用；通过自由基猝灭实验可知，在整个降解体系中起主导作用的活性氧化物质为O₂^-·和SO₄^-·和OH·自由基；FeCu-N-C经过4次循环后TC降解率依然有70.5%，表现出良好的稳定性.

Abstract：In this study， a kind of mesoporous catalytic material FeCu-N-C which was co-doped with Fe、Cu bimetal and N was prepared by hydrothermal method.The degradation of tetracycline （TC） was studied by FeCu-N-C activated persulfate（PS）. Simultaneously， various factors， such as FeCu-N-C dosage， TC concentration， PS concentration and initial pH， of FeCu-N-C on tetracycline （TC） degradation ， was investigated. The results showed that the conditions of （［FeCu-N-C］ =0.4 g·L^-1，［PS］ = 40 mg·L^-1，［TC］ = 40 mg·L^-1， pH = 8.0）， the degradation efficiency was achieved 90.5%. XPS indicates that the main catalytic active sites of composite FeCu-N-C were Fe-N_x and Cu-N_x . The ionic strength interference experiments showed that C₂O₄^2-and CO₃^2- have a significant inhibitory effect on the degradation of TC. The competitive radical quenching experiments illustrated that the active oxidants （O₂^-·， SO₄^-·and OH·） playing a leading role in the degradation system ； FeCu-N-C still had a TC degradation rate of 70.5% after 4 cycles， showing good stability.