title: Degradation of aniline by heterogeneous Fenton's reaction using a Ni-Fe oxalate complex catalyst.
abstract: A Ni-Fe oxalate complex catalyst was synthesized and characterized by means of Brunauer-Emmet-Teller (BET) method, scanning electron microscope (SEM) and X-ray photo-electron spectroscopy (XPS). The catalyst showed good catalytic activity for aniline degradation by heterogeneous Fenton's reaction, in which the synergetic index was 9.3. The effects of reaction temperature, catalyst dosage, hydrogen peroxide concentration and initial pH were investigated. Under the optimum conditions (T = 293 K, catalyst dosage = 0.2 g/L, H2O2 concentration = 4 mmol/L and initial pH = 5.4), 100% aniline could be removed within 35 min, and approximately 88% deamination efficiency was achieved in 60 min. The aniline degradation process followed the pseudo-first-order kinetic (k = 0.177 min(-1)) with activation energy (Ea) of 49.4 kJ mol(-1). Aniline could be removed in a broad initial pH (3-8) due to the excellent pH-tolerance property of the catalyst. The detected ammonium ion indicated that deamination occurred during aniline degradation. It was proposed that deamination synchronized with aniline removal, and aniline was attacked by free radicals to generate benzoquinonimine and phenol. This system is promising for the removal of aniline from water.
authors: School of Environment & Natural Resource, Renmin University of China, Beijing, 100872, PR China.
authors: Yucan
authors: Y
authors: Liu
authors: School of Environment & Natural Resource, Renmin University of China, Beijing, 100872, PR China. Electronic address: zgm@ruc.edu.cn.
authors: Guangming
authors: G
authors: Zhang
authors: School of Environment & Natural Resource, Renmin University of China, Beijing, 100872, PR China.
authors: Shunyan
authors: S
authors: Fang
authors: School of Environment & Natural Resource, Renmin University of China, Beijing, 100872, PR China.
authors: Shan
authors: S
authors: Chong
authors: School of Construction and Environment Engineering, Shenzhen Polytechnic, Shenzhen, 518055, PR China.
authors: Jia
authors: J
authors: Zhu
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D002384:Catalysis; D006801:Humans; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D000814:Aniline Compounds; C045076:Fenton's reagent; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide; D007501:Iron; C023650:aniline
keywords: Aniline; Deamination; Heterogeneous Fenton; Ni-Fe oxalate complex; pH-tolerance