Confirmation of radicals auto-generated in [Bmim][PF6]/[C16mim][PF6]/water reverse micelles and the radical quantification based on the 1,1-diphenyl-2-picrylhydrazine (DPPHH) spectroscopic probe

IF 2 4区化学 Q3 CHEMISTRY, ANALYTICAL Analytical Sciences Pub Date : 2025-03-20 DOI:10.1007/s44211-025-00744-6

Mengge Wang, Xiaofeng Chen, Zhigang Wang, Ming Li

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Abstract

Ionic liquids (ILs) which belong to the molten salt of a high ionic environment exhibit a number of unique properties, including the formation of various heterogeneities in their microemulsion. We found that auto-generated radicals within a [Bmim][PF₆]/[C₁₆mim][PF₆]/PBS reverse micelles (IL-RMs) and then the radicals were quantified in this study. For the radical confirmation, EPR spectroscopy with 5,5-dimethyl-1-pyrroline N-oxide (DMPO) free radical scavenger was carried out. A spectroscopic chemical probe of 1,1-diphenyl-2-picrylhydrazine (DPPHH) was employed to quantify the radicals in the IL-RM systems. The mechanism of the radical generation was also proposed. The DPPHH probe method is simple, rapid, and sensitive to quantify free radicals in the IL-RM systems. Finally, IL-RMs were successfully applied to degrade Rhodamine B (Rho-B) dye with low degradation cost, simple operation, short time consumption, and remarkable degradation effect. The results show a near 100% degradation rate for 10 μmol·L⁻¹ Rho-B in the IL-RMs system with pH 7.4 PBS containing 1 mmol·L⁻¹ chloroacetic acid as an aqueous phase.

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[Bmim][PF6]/[C16mim][PF6]/水反胶束中自由基自动生成的确认及基于1,1-二苯基-2-吡啶肼（DPPHH）光谱探针的自由基定量

离子液体属于高离子环境下的熔盐，具有许多独特的性质，包括在微乳液中形成各种非均质性。我们在[Bmim][PF6]/[C16mim][PF6]/PBS逆胶束（IL-RMs）中发现了自动生成的自由基，并对自由基进行了定量分析。为了证实自由基的存在，采用了含有5,5-二甲基-1-吡咯啉n -氧化物（DMPO）自由基清除剂的EPR光谱。采用1,1-二苯基-2-吡啶肼（DPPHH）光谱化学探针定量IL-RM体系中的自由基。并提出了自由基生成的机理。DPPHH探针法简便、快速、灵敏，可用于定量IL-RM系统中的自由基。最后，成功应用il - rm降解罗丹明B （Rhodamine B, Rho-B）染料，降解成本低，操作简单，耗时短，降解效果显著。结果表明，在pH为7.4 PBS、水相为1 mmol·L-1氯乙酸的IL-RMs体系中，对10 μmol·L-1 Rho-B的降解率接近100%。

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阿拉丁

1,1-diphenyl-2-picrylhydrazine

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chloroacetic acid

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methyl orange

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1-ethyl-2,3-dimethylimidazolium trifluoromethanesulfonimide

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1-butyl-3-methylimidazolium trifluoromethanesulfonimide

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1-butyl-2,3-methylimidazolium hexafluorophosphate

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1-hexadecyl-3-methylimidazolium hexafluorophosphate

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1-Butyl-3-methylimidazolium hexafluorophosphate

来源期刊

Analytical Sciences 化学-分析化学

CiteScore

2.90

自引率

18.80%

发文量

232

审稿时长

1 months

期刊介绍： Analytical Sciences is an international journal published monthly by The Japan Society for Analytical Chemistry. The journal publishes papers on all aspects of the theory and practice of analytical sciences, including fundamental and applied, inorganic and organic, wet chemical and instrumental methods. This publication is supported in part by the Grant-in-Aid for Publication of Scientific Research Result of the Japanese Ministry of Education, Culture, Sports, Science and Technology.