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铝铁柱撑黏土活化单过硫酸盐降解邻苯二甲酸二乙酯的研究
冯莉莎, 方国东, 周东美, 高 娟
中国科学院土壤环境与污染修复重点实验室(南京土壤研究所)
摘要:
邻苯二甲酸二乙酯(DEP)是地表水和土壤环境中一种常见的有机污染物,研究DEP的去除方法对于人体健康和环境安全具有十分重要的意义。蒙脱土是一种廉价易得的黏土矿物,通过将铝铁聚合阳离子引入蒙脱土的层间域可得到比表面积大和催化活性高的环境友好型催化材料——铝铁柱撑黏土(Al/Fe-PILCs)。利用X射线衍射(XRD)、BET比表面积、傅里叶变换红外光谱(FTIR)及高分辨率透射电子显微镜(HRTEM)等手段对材料的理化性质进行表征,并研究了其活化单过硫酸盐(PMS)对DEP的去除效果。结果表明:在Al/Fe-PILCs活化PMS体系中,反应24 h后DEP的降解率约为92%,且反应后的溶液中未检测到溶解性Fe离子。体系中产生的强氧化性?OH是DEP降解的主要原因。同时,环境中常见的阴离子(Cl-、NO3- 和CO32-)不能完全抑制DEP降解。因此,在实际水体和土壤环境中Al/Fe-PILCs作为活化PMS的催化材料,具有一定的应用潜力。
关键词:  铝铁柱撑黏土  单过硫酸盐  邻苯二甲酸二乙酯  自由基反应
DOI:10.13758/j.cnki.tr.2020.05.013
分类号:X53
基金项目:国家重点研发计划项目(2017YFA0207000)和国家自然科学基金面上项目(41773125)资助。
Degradation of Diethyl Phthalate Ester by Peroxymonosulfate Activated by Al/Fe-pillared Clays
FENG Lisha, FANG Guodong, ZHOU Dongmei, GAO Juan
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences
Abstract:
Diethyl phthalate ester (DEP) is a widely distributed organic contaminant in surface waters and soils, and its removal is important to human health and environmental safety. Montmorillonite is a cheap and abundant clay mineral. The Al/Fe pillared clays (Al/Fe-PILC) is an environmentally friendly catalytic material, which are synthesized by incorporating the hydroxyl polycations of Al and Fe into montmorillonite interlayers to increase surface and reactivity. In this study, the catalyst was characterized by XRD, BET, FTIR and HRTEM, and DEP degradation was studied by peroxymonosulfate (PMS) activated by Al/Fe-pillared clays. The results showed that DEP degradation rate after 24 h was about 92% and the ions of Fe were not detected in aqueous solution. DEP degradation was mainly attributed to the formed ?OH radicals. Further study found that common anions (Cl-, NO3- and CO32-) could not totally inhibit DEP degradation in the reaction system. Therefore, Al/Fe-PILCs is a promising catalyst in activating PMS for the remediation of organic contaminated water and soils.
Key words:  Al/Fe-pillared clays  Peroxymonosulfate  Diethyl phthalate ester (DEP)  Radical reaction

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