title: A kinetic study on the degradation of p-nitroaniline by Fenton oxidation process.
abstract: A detailed kinetic model was developed for the degradation of p-nitroaniline (PNA) by Fenton oxidation. Batch experiments were carried out to investigate the role of pH, hydrogen peroxide and Fe(2+) levels, PNA concentration and the temperature. The kinetic rate constants, k(ap), for PNA degradation at different reaction conditions were determined. The test results show that the decomposition of PNA proceeded rapidly only at pH value of 3.0. Increasing the dosage of H(2)O(2) and Fe(2+) enhanced the k(ap) of PNA degradation. However, higher levels of H(2)O(2) also inhibited the reaction kinetics. The k(ap) of PNA degradation decreased with the increase of initial PNA concentration, but increased with the increase of temperature. Based on the rate constants obtained at different temperatures, the empirical Arrhenius expression of PNA degradation was derived. The derived activation energy for PNA degradation by Fenton oxidation is 53.96 kJ mol(-1).
authors: College of Chemistry and Environmental Sciences, Henan Normal University, Henan Key Laboratory for Environmental Pollution Control, Xinxiang, Henan 453007, PR China. sunsp_hj@yahoo.com.cn
authors: Jian-Hui
authors: JH
authors: Sun
authors: Sheng-Peng
authors: SP
authors: Sun
authors: Mao-Hong
authors: MH
authors: Fan
authors: Hui-Qin
authors: HQ
authors: Guo
authors: Li-Ping
authors: LP
authors: Qiao
authors: Rui-Xia
authors: RX
authors: Sun
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006861:Hydrogen Peroxide; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000517:prevention & control*; D007501:Iron; D007700:Kinetics; D008956:Models, Chemical; D010084:Oxidation-Reduction; D013696:Temperature; D013816:Thermodynamics; 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; C008625:nitroaniline; D006861:Hydrogen Peroxide; D007501:Iron