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Fly‐Ash Incorporated Slurry and Fixed‐Bed Approach for Heterogeneous Solar Photo‐Fenton Degradation of Isoproturon
Author(s) -
Verma Anoop,
Kaur Gurpreet,
Bansal Palak,
Gupta Saurabh,
Kumar Sangal Vikas
Publication year - 2018
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12864
Subject(s) - degradation (telecommunications) , slurry , chemistry , fouling , reagent , oxide , chemical engineering , nuclear chemistry , environmental chemistry , environmental engineering , organic chemistry , environmental science , biochemistry , telecommunications , membrane , computer science , engineering
The study presented the potential use of fly‐ash (FA) as an iron source to study photo‐Fenton degradation of isoproturon (IPU) both for slurry as well as fixed‐bed approach. Generally, metal oxide compounds, i.e., iron in FA combine with H 2 O 2 to form a Fenton‐like reagent and produce hydroxyl radicals. The degradation rate was found to be strongly dependent on FA dosage, amount of H 2 O 2 , pH and initial concentration of IPU. Solar photo‐Fenton process at optimized conditions (FA 5.0 gL −1 ; H 2 O 2 0.34 gL −1 ; pH 2) yielded 91.12% degradation of IPU. Recycling studies were performed by separating the used FA from the treated solution of IPU. However, a decrease in efficiency of FA for the treatment of IPU was observed due to surface fouling. To further envisage the field‐scale applications of FA for waste‐water treatment, FA beads were prepared to carry out the fixed‐bed photo‐Fenton studies for the degradation of IPU. FA beads were found to be stable or durable enough even after 10 recycles and yielded 65% degradation of IPU after 3 h of solar irradiation at an optimized dose of H 2 O 2 , i.e., 0.34 gL −1 . A tentative degradation pathway for IPU has also been proposed after carefully identifying the intermediates through GC‐MS analysis. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018