Kinetic and mechanistic study of photochemical degradation of 4-chlorophenol using peroxy acetic acid (PAA)

Abstract

In this work, kinetic and mechanistic study of photochemical degradation of 4-chlorophenol (4-CP) with UV lamp of 6 W, 12 W, 18 W, and peroxy acetic acid (PAA) oxidant was estimated. The differential method was evaluated by fractional order of reaction for both UV and UV/PAA processes. Overall and initial reaction rate constants were evaluated using integral method. Reaction rate increases with UV input and PAA concentration and it decreases with the increase in 4-CP concentration. Samples were analyzed by HPLC, UV spectrophotometer, and GC-MS for residual concentration and identification of degraded products. The degradation compounds are identified and probable mechanism of reaction is established.

Keywords:

• 4-Chlorophenol (4-CP)
• Kinetic study
• Mechanism
• PAA
• UV

Acknowledgments

The authors wish to thank SAIF, Indian Institute of Technology, Mumbai for their GC-MS analysis support for this research.