Kinetics and mechanism of photoactivated periodate reaction with 4-chlorophenol in acidic solution.
The application of photoactivated periodate (UV/IO4-) to the degradation of 4-chlorophenol (4-CP) was explored in this study. Under low irradiation intensities (23 microW/cm2), wavelength of 266 nm, and pH 3, 4-CP was observed to degrade by pseudo-first-order reaction kinetics. The small reduction in 4-CP degradation in the presence of tert-butyl alcohol (t-BuOH) suggests that degradation of 4-CP by UV/IO4- was not dominated by an OH* pathway. O3 production was suppressed in the presence of t-BuOH under O2-limited environments and in the presence of 4-CP. Faster degradation of 4-CP in the presence of an OH* scavenger under nitrogen purging as compared to air-saturated conditions indicates that O(3P) is an important reactive species with 4-CP in this system. When 4-CP is added to the system, IO3- production is enhanced. On the basis of the elimination of potential reaction pathways, O(3P) and IO3* are suspected reactive species with 4-CP in this system.
Chia
Liang-Hiong
LH
Department of Chemical and Biomolecular Chemistry, The Ohio State University, Columbus, Ohio 43210, USA.
Tang
Xueming
X
Weavers
Linda K
LK
D002733:Chlorophenols / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008934:Mitogens / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry; D010504:Periodic Acid / Q000737:chemistry*; D010777:Photochemistry; D014873:Water Pollutants
D002733:Chlorophenols; D008934:Mitogens; D014873:Water Pollutants; D010504:Periodic Acid; C029107:4-chlorophenol; C009288:metaperiodate; D009584:Nitrogen