摘要
本文以水热合成法和共沉淀法制备了纳米Fe_(3)O_(4)/皂石复合材料,并用于去除水中2,4-二氯苯酚(2,4-DCP)。采用X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、扫描电镜(SEM)、透射电子显微镜(TEM)和X射线荧光光谱(XRF)等表征手段测试了纳米Fe_(3)O_(4)/皂石复合材料的物相组成、结构、形貌和元素组成,并考察了纳米Fe_(3)O_(4)/皂石复合材料在不同2,4-DCP溶液浓度、反应时间和pH等条件下对2,4-DCP的去除效果。结果表明,在皂石表面原位生长的纳米Fe_(3)O_(4)分散较为均匀,有效降低了Fe_(3)O_(4)的团聚现象。纳米Fe_(3)O_(4)/皂石复合材料在溶液pH值为6时,对2,4-DCP的最大去除量为178.46 mg/g,在反应时间为5 min时,对2,4-DCP去除量达到饱和。纳米Fe_(3)O_(4)/皂石复合材料对2,4-DCP的去除动力学符合准二级动力学模型。在此基础上,通过液相质谱联用(LC-MS)检测出2,4-DCP被降解后生成了氯酚等中间产物。本研究成果为水中有机污染物的降解提供了一种新型、环保且高效的环境功能材料。
In this study,the nano-Fe_(3)O_(4)/saponite composites were prepared by hydrothermal synthesis and coprecipitation method,and used to remove 2,4-dichlorophenol(2,4-DCP)from water.The phase composition,structure,morphology and elemental composition of nano-Fe_(3)O_(4)/saponite composites were characterized by X-ray diffraction(XRD),fourier transform infrared spectroscopy(FTIR),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and X-ray fluorescence(XRF).The removal efficiency of 2,4-DCP by nano-Fe_(3)O_(4)/saponite composites under solution with different 2,4-DCP concentration,reaction time and pH were investigated.The results show that the in-situ growth of nano-Fe_(3)O_(4)on the surface of saponite is more evenly dispersed,which effectively reduces the agglomeration of Fe_(3)O_(4).The maximum removal of 2,4-DCP by nano-Fe_(3)O_(4)/saponite composites is 178.46 mg/g when the pH value is 6,and the removal of 2,4-DCP reaches saturation when the reaction time is 5 min.The removal kinetics of 2,4-DCP by nano-Fe_(3)O_(4)/saponite composites accords with the pseudo-second-order kinetic model.On this basis,liquid chromatography-mass spectrometry(LC-MS)analysis shows that 2,4-DCP is degraded into chlorophenol and other intermediate products.The research results provide a new,environmentally-friendly and efficient environmental functional material for the degradation of organic pollutants in water.
作者
吴丽梅
刘䶮
王晓龙
唐宁
王晴
WU Limei;LIU Yan;WANG Xiaolong;TANG Ning;WANG Qing(School of Materials Science and Engineering,Shenyang Jianzhu University,Shenyang 110168,China;School of Mechanical Engineering,Shenyang Jianzhu University,Shenyang 110168,China)
出处
《硅酸盐通报》
CAS
北大核心
2022年第5期1821-1829,共9页
Bulletin of the Chinese Ceramic Society
基金
“兴辽英才计划”青年拔尖人才(XLYC2007105)
辽宁省自然科学基金面上项目(2020-MS-202)。
