Degradation of chlorophenols using a novel Fe0/CeO2 composite
Degradation of chlorophenols using a novel Fe0/CeO2 composite
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DOI：
10.1016/j.apcatb.2013.05.065
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发表时间：
2013-10
影响因子：
22.1
通讯作者：
L. Xu;Jun Wang
中科院分区：
文献类型：
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作者：
L. Xu;Jun Wang
合成了一种新型的Fe 0/CeO 2复合材料，并对其进行了表征，研究了其对4-氯苯酚（4-CP）、2，4-二氯苯酚（2，4-DCP）、2，4，6-三氯苯酚（2，4，6-TCP）和五氯苯酚（PCP）的去除效果。采用浸渍法制备了Fe 0/CeO 2复合材料，采用X射线衍射（XRD）、扫描电子显微镜（SEM）和能谱仪（EDX）、高分辨透射电子显微镜（HRTEM）、BET法、X射线光电子能谱（XPS）和拉曼光谱等手段对反应前后的Fe 0/CeO 2复合材料进行了表征。结果表明，纳米零价铁颗粒呈球形分散在氧化铈基体上，粒径在200-400 nm之间。合成的Fe 0/CeO 2复合材料的BET比表面积和孔容分别为16.76 m2/g和0.056 cm 3/g。CeO 2的引入促进了表面化学吸附氧的生成和Fe 0. 2，4-DCP吸附在Fe 0/CeO 2表面，被Fe 0和Fe 2+还原脱氯，和/或被羟基自由基（dotOH）、超氧自由基（O2 radical dot−）和H2 O2氧化降解。此外，对氯酚、TOC和脱氯的去除效果均为PCP > 2，4-DCP > 2，4，6-TCP > 4-CP。
A novel Fe0/CeO2composite was synthesized, characterized and applied for removal of different kinds of chlorophenols, including 4-chlorophenol (4-CP), 2,4-dichlorophenol (2,4-DCP), 2,4,6-trichlorophenol (2,4,6-TCP) and pentachlorophenol (PCP). Fe0/CeO2composite was prepared by the impregnation method, their physicochemical properties were characterized before and after reaction by X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy-dispersive X-ray spectrometer (EDX), high-resolution transmission electron microscopy (HRTEM), the Brunauer–Emmett–Teller (BET) method, X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The results showed that spherical zero-valent iron particles ranged in 200–400 nm were dispersed on ceria matrix. The BET surface area and pore volume of synthesized Fe0/CeO2composite were 16.76 m2/g and 0.056 cm3/g, respectively. The introduction of CeO2facilitated the generation of chemisorbed oxygen on the surface and the dissolution of Fe0. 2,4-DCP was adsorbed on the Fe0/CeO2surface, reductive dechlorinated by Fe0and Fe2+, and/or oxidative degraded by hydroxyl radicals (radical dotOH), superoxide radicals (O2radical dot−), and H2O2species. Additionally, the extent of chlorophenols removal, TOC removal and dechlorination followed the order of PCP > 2,4-DCP > 2,4,6-TCP > 4-CP.