A kinetic study on the degradation of p-nitroaniline by Fenton oxidation process.
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).
Sun
Jian-Hui
JH
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
Sun
Sheng-Peng
SP
Fan
Mao-Hong
MH
Guo
Hui-Qin
HQ
Qiao
Li-Ping
LP
Sun
Rui-Xia
RX
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*
D000814:Aniline Compounds; C045076:Fenton's reagent; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; C008625:nitroaniline; D006861:Hydrogen Peroxide; D007501:Iron