催化作用
过硫酸盐
邻苯二甲酸二乙酯
化学工程
水溶液
X射线光电子能谱
傅里叶变换红外光谱
扫描电子显微镜
化学
纳米材料
纳米颗粒
核化学
材料科学
透射电子显微镜
纳米技术
邻苯二甲酸盐
有机化学
复合材料
工程类
作者
Xiaoling Zhang,Mingbao Feng,Ruijuan Qu,Hui Liu,Liansheng Wang,Zunyao Wang
标识
DOI:10.1016/j.cej.2016.04.096
摘要
Diethyl phthalate (DEP), a plasticizer widely used in chemical industry, has been classified as an endocrine disruptor. Therefore, it is urgent to develop methods for degradation of DEP to minimize its ecological risk. In this study, copper ferrite decorated multi-walled carbon nanotubes magnetic nanoparticles (CuFe2O4/MWCNTs MNPs) were prepared by sol–gel combustion method as catalysts for the degradation of DEP. The catalysts were characterized by scanning electron microscope, transmission electron microscope, Fourier transform infrared spectroscopy, nitrogen gas uptake, X-ray diffraction, and X-ray photoelectron spectroscopy. Catalytic degradation of DEP by persulfate (PS) was investigated with various influencing factors including catalyst loading, PS concentrations, temperature and pH. Furthermore, the CuFe2O4/MWCNTs MNPs showed high catalytic activity, stability and recyclability in DEP removal. Especially, leaching of metal ions from reused CuFe2O4/MWCNTs was negligible (concentration < 0.4%), indicating the resistance to oxidation. The electron paramagnetic resonance analysis confirmed that the addition of CuFe2O4/MWCNTs into PS system can accelerate the generation of OH and SO4−, and the quenching experiments further certified the catalytic reaction was predominated by SO4−. The degradation intermediates were identified and the pathways were proposed. Overall, this study provides practical knowledge for DEP removal by CuFe2O4/MWCNTs activated PS at ambient temperature.
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