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Alcohols as Scavengers for Hydroxyl Radicals in Photocatalytic Systems: Reliable or Not?
https://orcid.org/0000-0003-2418-0459
https://orcid.org/0000-0002-8580-3368
https://orcid.org/0000-0002-1891-6602
The evaluation of the contributions of hydroxyl radicals (•OH) is of great significance toward the elucidation of photocatalytic mechanisms. Currently, trapping (or quenching) tests have been widely conducted for the determination of reactive species, where alcohols are often selected as •OH scavengers. However, their feasibility and reliability have been under scrutiny by researchers and need to be further explored. For this study, a photocatalytic system was established using P25 as the photocatalyst and bisphenol A (BPA) and oxalic acid as model pollutants under UV light irradiation. The quenching capacities of five alcohols were investigated at concentrations ranging from 0.5 to 100 mM. The alcohols revealed different quenching abilities in the BPA and oxalic acid systems. Further, the amount of H2O2 generated from highly concentrated alcohols was quantified, which significantly influenced the estimation of the contribution of •OH. Unexpectedly, •O2 – was also formed in the system, whose contribution to the degradation of pollutants was also mistakenly attributed to •OH. This study provides a comprehensive evaluation of the five most commonly used alcohols as scavengers for •OH. Based on the findings, it strongly recommends reconsidering these alcohols and emphasizes the need for developing more reliable methods for detecting radicals.
Trapping tests have become one of the most used techniques for studying the mechanisms of photocatalysis. This study explores the questions about using alcohols as •OH scavengers.
Alcohols as Scavengers for Hydroxyl Radicals in Photocatalytic Systems: Reliable or Not?
https://orcid.org/0000-0003-2418-0459
https://orcid.org/0000-0002-8580-3368
https://orcid.org/0000-0002-1891-6602
The evaluation of the contributions of hydroxyl radicals (•OH) is of great significance toward the elucidation of photocatalytic mechanisms. Currently, trapping (or quenching) tests have been widely conducted for the determination of reactive species, where alcohols are often selected as •OH scavengers. However, their feasibility and reliability have been under scrutiny by researchers and need to be further explored. For this study, a photocatalytic system was established using P25 as the photocatalyst and bisphenol A (BPA) and oxalic acid as model pollutants under UV light irradiation. The quenching capacities of five alcohols were investigated at concentrations ranging from 0.5 to 100 mM. The alcohols revealed different quenching abilities in the BPA and oxalic acid systems. Further, the amount of H2O2 generated from highly concentrated alcohols was quantified, which significantly influenced the estimation of the contribution of •OH. Unexpectedly, •O2 – was also formed in the system, whose contribution to the degradation of pollutants was also mistakenly attributed to •OH. This study provides a comprehensive evaluation of the five most commonly used alcohols as scavengers for •OH. Based on the findings, it strongly recommends reconsidering these alcohols and emphasizes the need for developing more reliable methods for detecting radicals.
Trapping tests have become one of the most used techniques for studying the mechanisms of photocatalysis. This study explores the questions about using alcohols as •OH scavengers.
Alcohols as Scavengers for Hydroxyl Radicals in Photocatalytic Systems: Reliable or Not?
https://orcid.org/0000-0003-2418-0459
https://orcid.org/0000-0002-8580-3368
https://orcid.org/0000-0002-1891-6602
The evaluation of the contributions of hydroxyl radicals (•OH) is of great significance toward the elucidation of photocatalytic mechanisms. Currently, trapping (or quenching) tests have been widely conducted for the determination of reactive species, where alcohols are often selected as •OH scavengers. However, their feasibility and reliability have been under scrutiny by researchers and need to be further explored. For this study, a photocatalytic system was established using P25 as the photocatalyst and bisphenol A (BPA) and oxalic acid as model pollutants under UV light irradiation. The quenching capacities of five alcohols were investigated at concentrations ranging from 0.5 to 100 mM. The alcohols revealed different quenching abilities in the BPA and oxalic acid systems. Further, the amount of H2O2 generated from highly concentrated alcohols was quantified, which significantly influenced the estimation of the contribution of •OH. Unexpectedly, •O2 – was also formed in the system, whose contribution to the degradation of pollutants was also mistakenly attributed to •OH. This study provides a comprehensive evaluation of the five most commonly used alcohols as scavengers for •OH. Based on the findings, it strongly recommends reconsidering these alcohols and emphasizes the need for developing more reliable methods for detecting radicals.
Trapping tests have become one of the most used techniques for studying the mechanisms of photocatalysis. This study explores the questions about using alcohols as •OH scavengers.
Alcohols as Scavengers for Hydroxyl Radicals in Photocatalytic Systems: Reliable or Not?
Ding, Li (author) / Hou, Yiming (author) / Liu, Haijin (author) / Peng, Jianbiao (author) / Cao, Zhiguo (author) / Zhang, Yakun (author) / Wang, Bingjie (author) / Cao, Xin (author) / Chang, Yu (author) / Wang, Tian (author)
ACS ES&T Water ; 3 ; 3534-3543
2023-11-10
Article (Journal)
Electronic Resource
English
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