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Synthesis of a Fe/ AC Fenton‐like catalyst and heterogeneous catalysis in decolorization of Sunset Yellow by pulsed high‐voltage discharge
Author(s) -
Zhu Xinyan,
Ma Yuepeng,
Liu Ying,
Yang Zemeng,
Li Qunsheng,
Zhou Zhiyong,
Ren Zhongqi
Publication year - 2017
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5184
Subject(s) - catalysis , sintering , heterogeneous catalysis , chemical engineering , materials science , chemistry , nuclear chemistry , metallurgy , organic chemistry , engineering
BACKGROUND A new Fe/ AC heterogeneous Fenton‐like catalyst was prepared using a dipping–sintering method. The prepared catalyst was characterized by X‐ray diffraction and scanning electron microscopy. The decolorization of Sunset Yellow was conducted in a self‐designed pulsed high‐voltage discharge system by the catalysis of the prepared heterogeneous catalyst. Effects of preparation conditions of catalyst (carrier material, sintering temperature and dipping time) and operating conditions (catalyst dosage, pH and treatment method) on decolorization efficiency were investigated. RESULTS Spherical activated carbon ( AC ) was selected as the carrier material and the optimal dipping time and sintering temperature were 8 h and 350 °C, respectively. The efficiency of decolorization of Sunset Yellow was above 90% after 30 min of a pulsed high‐voltage discharge process with 5 g heterogeneous catalyst and at pH 2.00. The utilization of copper mesh not only enhanced the decolorization of Sunset Yellow but also facilitated the reusability of the prepared heterogeneous catalyst. The efficiency of decolorization of Sunset Yellow with prepared Fe/ AC heterogeneous Fenton‐like catalyst (5 g) was even a little higher than that with homogeneous catalyst (1.635 mmol L −1 Fe 2+ ). The decolorization efficiency remained above 90% after ten recycles of the catalyst, indicating that the prepared heterogeneous catalyst has good stability and reusability. In addition, a possible catalytic mechanism for the decolorization reaction in a pulsed high‐voltage discharge system with prepared Fe/ AC heterogeneous Fenton‐like catalyst was proposed by determination of H 2 O 2 and · OH concentrations in deionized water. CONCLUSIONS The prepared Fe/ AC heterogeneous Fenton‐like catalyst efficiently degrades Sunset Yellow wastewater in a pulsed high‐voltage discharge system. © 2016 Society of Chemical Industry