Inquest of efficient photo-assist advanced oxidation processes (AOPs) for removal of azo dye (acid yellow 17) in aqueous medium: a comprehensive study on oxidative decomposition of AY 17

Abstract

In this study, the photo-assist degradation of acid yellow (AY 17) dye is reported in detail by applying various UV radiation supported advanced oxidation processes (AOPs). The AY 17 dye in water solution (model and natural) is decomposed by direct photolysis, UV/oxidant, photo-Fenton, photo-Fenton-like, UV/HSO 5-/Fe 2+ , and UV/S 2 O 8 2− /Fe 2+ system. All applied processes are found to be the comparably effective at pH 3.0. It is observed that the efficiency of AY 17 degradation increased with the initial concentration of the oxidants (H 2 O 2 , HSO 5 and S 2 O 8 2-) and catalyst (Fe 2+ and Fe 3+). Moreover, the initial concentration of the dye solution has inverse effect on the efficiency of applied AOPs. It is also reported that decomposition of dye through photo-assist AOPs followed pseudo-first-order kinetic while the efficiency of all processes increased with temperature. The activation energy (E a) has been determined in the range of between 10 to 20 kJ/mol. The entropy of degradation is also calculated and has found to be positive. Finally, it is concluded that photo-Fenton process (UV/H 2 O 2 /Fe 2+) is comparably more efficient method for the removal of AY 17 dye from natural water sample.

Atrazine degradation through a heterogeneous dual-effect process using Fe–TiO2-allophane catalysts under sunlight

“…5 , ATZ degradation increased as the initial pH decreased, with a pseudo-first-order reaction rate 2 times higher for the reaction performed at an initial pH of 3.0 than the initial pH of 5.0 and almost 9 times higher than autoregulated pH ( Table 4 ). While the optimum pH reported for the Fenton process is typically around pH 3.0 [ 80 , 81 ], it is noteworthy that under less acidic conditions (initial pH 5.0), complete removal of ATZ was achievable. However, this accomplishment necessitated an extended reaction time of 6 h and resulted in a COD decay of 35 %, in contrast to the 85 % ATZ degradation observed at pH 3.0.…”

Hydrogen Peroxide/Zero Valent Iron/Persulfate Approach for Dye Degradation: Key Operating Parameter and Synergistic Effect

“…•− ) has been applied for removing dyes from large volumes of wastewater (Khan et al 2013;Wordofa et al 2017;Tariq & Khan 2020). Hydrogen peroxide (H 2 O 2 ) with oxidation potential 2.07 V is a common oxidizing agent used in the oxidation of organic compounds (Hou et al 2012).…”

Hydrogen Peroxide/Zero-ValentIron/Persulfate Approach for Sunset Yellow Dye Degradation: Operating Parameters and Synergistic Effect

“…Advanced Oxidation Processes (AOPs) such as ozonation, UV/O 3 , UV/H 2 O 2 , Fe 2+ /H 2 O 2 , and UV/O 3 /H 2 O 2 has received remarkable attention for the removal of azo dyes (Seid-Mohammadi et al 2014;Zhang et al 2019). Over the last few decades, chemical oxidants, such as ozone, hydrogen peroxide (HP) and persulfate (PS), have been applied for removing dyes from large volumes of wastewater through the production of hydroxyl radicals (HO • ) and sulfate radicals (SO 4 •− ) (Wordofa et al 2017;Tariq and Khan 2020). Hydrogen peroxide (H 2 O 2 ) with oxidation potential of 1.78 V is a common oxidizing agent used in the oxidation of organic compounds (Cai et al 2020).…”