[Degradation of 3-chlorophenol in aqueous solution by combined process of gamma-radiation and H2O2].
The radiolytical degradation of 3-chlorophenol (3-CP) in aqueous solution was investigated using gamma-radiation and gamma-radiation/hydrogen peroxide (H2O2) combined process. The effect of absorbed dose, initial concentration of 3-CP and addition of H2O2 on pollutant degradation, dechlorination and the degree of mineralization was studied by measuring the removal efficiency of 3-CP, the variation of total organic carbon (TOC), the dechlorination rate, and the absorbance spectrum of vis-UV. The kinetics of 3-CP degradation was also discussed. The results showed that when 3-CP concentration was 10 mg x L(-1) and the absorbed dose was 2 kGy, the dechlorination rate reached 100%, the TOC removal efficiency was 53%; when the absorbed dose increased to 8 kGy, 3-CP could be completely mineralized and the TOC removal efficiency reached 100%. The radiolysis of 3-CP could be described by one-order reaction kinetics, there existed synergic effect for combined process of gamma-irradiation/hydrogen peroxide for 3-CP degradation. The rate constant of 3-CP degradation for gamma-radiation and gamma-radiation/hydrogen peroxide combined process was 0.279 h(-1) and 0.542 h(-1), respectively.
Hu
Jun
J
Laboratory of Environmental Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China. hujun@tsinghua.edu.cn
Wang
Jian-long
JL
D002733:Chlorophenols / Q000302:isolation & purification* / Q000528:radiation effects; D003037:Cobalt Radioisotopes; D005720:Gamma Rays; D006861:Hydrogen Peroxide / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification* / Q000528:radiation effects
D002733:Chlorophenols; D003037:Cobalt Radioisotopes; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide; C030682:3-chlorophenol