Kinetics and mechanism of para-chlorophenol photoconversion with the presence of nitrite in ice.
The photochemistry of para-chlorophenol (4-CP) under UV irradiation by using a 125-W high-pressure mercury lamp as light source with the presence of nitrite in a solid water ice matrix had been studied. The experiments were carried out in a photochemical cold chamber reactor at -14 to -12 degrees C. Each influence factor of the 4-CP photoconversion kinetics in the water ice was inspected. The results show that the 4-CP photoconversion obeys the first-order kinetics model and the initial concentration of 4-CP, the initial concentration of nitrite, pH value, light intensity, inorganic ions and the water quality all have significant influence on the photoconversion rate. In addition, nine intermediate products were characterized by GC-MS, HPLC-ESI-MS and HPLC techniques and the possible photoconversion mechanism was proposed accordingly. It is concluded that the mechanism and photoproducts of 4-CP photolysis in ice are changed due to the presence of NO(2)(-).
Kang
Chun-Li
CL
College of Environment and Resources, Jilin University, Changchun 130023, China. kangcl@jlu.edu.cn
Gao
Hong-Jie
HJ
Guo
Ping
P
Zhang
Ge-Shan
GS
Tang
Xiao-Jian
XJ
Peng
Fei
F
Liu
Xing-Juan
XJ
D002733:Chlorophenols / Q000737:chemistry*; D003080:Cold Temperature; D007053:Ice; D007700:Kinetics; D009573:Nitrites / Q000737:chemistry*; D010782:Photolysis; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical
D002733:Chlorophenols; D007053:Ice; D009573:Nitrites; D014874:Water Pollutants, Chemical