Advanced oxidation of 4-chlorophenol via combined pulsed light and sulfate radicals methods: Effect of co-existing anions

Sousan Hadi; Ensiyeh Taheri; Mohammad Mehdi Amin; Ali Fatehizadeh; Tejraj M Aminabhavi

doi:10.1016/j.jenvman.2021.112595

Advanced oxidation of 4-chlorophenol via combined pulsed light and sulfate radicals methods: Effect of co-existing anions

J Environ Manage. 2021 Aug 1:291:112595. doi: 10.1016/j.jenvman.2021.112595. Epub 2021 Apr 30.

Authors

Sousan Hadi¹, Ensiyeh Taheri², Mohammad Mehdi Amin³, Ali Fatehizadeh⁴, Tejraj M Aminabhavi⁵

Affiliations

¹ Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran; Student Research Committee, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran. Electronic address: sousanhadi@gmail.com.
² Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran; Environment Research Center, Research Institute for Primordial Prevention of Non-Communicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran. Electronic address: e_taheri@hlth.mui.ac.ir.
³ Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran; Environment Research Center, Research Institute for Primordial Prevention of Non-Communicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran. Electronic address: amin@hlth.mui.ac.ir.
⁴ Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran; Environment Research Center, Research Institute for Primordial Prevention of Non-Communicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran. Electronic address: a.fatehizadeh@hlth.mui.ac.ir.
⁵ Department of Chemistry, Karnatak University, Dharwad, 580 003, India. Electronic address: aminabhavit@gmail.com.

PMID: 33940359
DOI: 10.1016/j.jenvman.2021.112595

Abstract

Pulsed light (PL) technology, which is based on photonic technology involves the application of broadband emission of light with short and high-power pulses is beginning to emerge for the treatment of wastes via advanced oxidation processes (AOP). The present work investigates the efficiency of PL as a light source for persulfate (PS) activation (PL/PS) and 4-chlorophenol)4-CP) degradation, an organic model pollutant. The influencing parameters on 4-CP degradation such as solution pH, reaction time, initial concentration of 4-CP, PS dose, pulse intensity and frequency, and distance from PL source are systematically investigated. With increasing pH from 3 to 9, the 4-CP degradation decreased from 49.79 ± 2.49 to 33.12 ± 1.66%. The 4-CP degradation followed the first order kinetics that was improved with increasing reaction time, PS dose, pulse intensity, frequency of pulse, and decreasing pH, initial 4-CP concentration and distance from the PL source. The presence of sulfate, chloride, and carbonate anions in the solution has the inhibitory effects on 4-CP degradation, while nitrate anion improved the performance of PL/PS system. In addition, presence of humic acid had an inhibitory effect on the PL/PS system, which led to a decrease of reaction rate constant and 4-CP degradation was performed in PL/PS system with OH, SO₄^-, O₂^- and ₁O² radicals. The contributions of OH and SO₄^- radicals were 46% and 51%, respectively for the 4-CP degradation and synergistic effect of PL/PS system showed a significant influence on 4-CP degradation while using a combination of PL and PS, suggesting that PL is an effective activator of PS.

Keywords: 4-Chlorophenol; Advanced oxidation process; Persulfate; Pulsed light.

MeSH terms

Chlorophenols*
Oxidation-Reduction
Sulfates
Water Pollutants, Chemical* / analysis

Substances

Chlorophenols
Sulfates
Water Pollutants, Chemical
sulfate radical
4-chlorophenol