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Alcohols as Scavengers for Hydroxyl Radicals in Photocatalytic Systems: Reliable or Not?
ACS ES&T Water ( IF 4.8 ) Pub Date : 2023-10-06 , DOI: 10.1021/acsestwater.3c00271 Li Ding 1 , Yiming Hou 1 , Haijin Liu 1 , Jianbiao Peng 1 , Zhiguo Cao 1 , Yakun Zhang 1 , Bingjie Wang 1 , Xin Cao 1 , Yu Chang 1 , Tian Wang 1 , Guoguang Liu 1, 2
ACS ES&T Water ( IF 4.8 ) Pub Date : 2023-10-06 , DOI: 10.1021/acsestwater.3c00271 Li Ding 1 , Yiming Hou 1 , Haijin Liu 1 , Jianbiao Peng 1 , Zhiguo Cao 1 , Yakun Zhang 1 , Bingjie Wang 1 , Xin Cao 1 , Yu Chang 1 , Tian Wang 1 , Guoguang Liu 1, 2
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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.
中文翻译：
醇作为光催化系统中羟基自由基的清除剂：可靠与否？
评估羟基自由基（· OH）的贡献对于阐明光催化机理具有重要意义。目前，捕获（或猝灭）测试已广泛用于测定活性物质，其中通常选择醇作为· OH 清除剂。然而，它们的可行性和可靠性已经受到研究人员的审视，需要进一步探索。本研究以P25为光催化剂，以双酚A（BPA）和草酸为模型污染物，在紫外光照射下建立了光催化体系。研究了浓度范围为 0.5 至 100 mM 的五种醇的猝灭能力。醇类在 BPA 和草酸体系中表现出不同的猝灭能力。此外，对高浓度醇产生的H 2 O 2量进行了定量，这显着影响了对• OH贡献的估计。出乎意料的是，系统中也形成了• O 2 - ，其对污染物降解的贡献也被错误地归因于• OH。这项研究对五种最常用的醇作为 OH 清除剂进行了全面评估。根据这些发现，它强烈建议重新考虑这些醇，并强调需要开发更可靠的方法来检测自由基。
更新日期：2023-10-06
中文翻译：
醇作为光催化系统中羟基自由基的清除剂：可靠与否？
评估羟基自由基（· OH）的贡献对于阐明光催化机理具有重要意义。目前，捕获（或猝灭）测试已广泛用于测定活性物质，其中通常选择醇作为· OH 清除剂。然而，它们的可行性和可靠性已经受到研究人员的审视，需要进一步探索。本研究以P25为光催化剂，以双酚A（BPA）和草酸为模型污染物，在紫外光照射下建立了光催化体系。研究了浓度范围为 0.5 至 100 mM 的五种醇的猝灭能力。醇类在 BPA 和草酸体系中表现出不同的猝灭能力。此外，对高浓度醇产生的H 2 O 2量进行了定量，这显着影响了对• OH贡献的估计。出乎意料的是，系统中也形成了• O 2 - ，其对污染物降解的贡献也被错误地归因于• OH。这项研究对五种最常用的醇作为 OH 清除剂进行了全面评估。根据这些发现，它强烈建议重新考虑这些醇，并强调需要开发更可靠的方法来检测自由基。
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