title: Degradation of p-Nitrophenol using magnetic Fe0/Fe3O4/Coke composite as a heterogeneous Fenton-like catalyst.
abstract: A Coke supported Fe3O4and Fe0composite (Fe0/Fe3O4/Coke) was prepared for the first time with the aim of evaluating its ability to be used as heterogeneous catalyst for the Fenton degradation of p-Nitrophenol (p-NP). A four factor Box-Behnken design (BBD) coupled with response surface methodology (RSM) was applied to evaluate the effects of several operating parameters, namely Fe0/Fe3O4/Coke dosage, reaction temperature, initial pH and H2O2concentration, on the removal efficiency of p-NP. A significant quadratic model (p-value<0.0001, R2=0.9952) was derived using analysis of variance (ANOVA). Optimum conditions were determined to be 1.3g/L catalyst, 32°C, pH3.1 and 11.3mM H2O2. 100% of p-NP (100mg/L) conversion and 81% of COD removal were achieved after 120min of reaction time, respectively, under the optimum conditions, which agreed well with the modeling prediction. The recyclability of Fe0/Fe3O4/Coke was also investigated after three successive runs, in which p-NP degradation performances showed a slight difference with the first oxidation cycle with an acceptable iron leaching. Moreover, according to the main intermediate products identified by gas chromatography-mass spectrometry (GC-MS), a possible pathway of p-NP degradation was proposed based on hydrogen radicals ([H]) or hydroxyl radicals (•OH) mechanism.
authors: School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.
authors: Dong
authors: D
authors: Wan
authors: School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China. Electronic address: liwenbing@wust.edu.cn.
authors: Wenbing
authors: W
authors: Li
authors: School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.
authors: Guanghua
authors: G
authors: Wang
authors: School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.
authors: Lulu
authors: L
authors: Lu
authors: School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.
authors: Xiaobi
authors: X
authors: Wei
keywords: Coke; Heterogeneous degradation; Magnetic composite; Response surface methodology; p-Nitrophenol