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Synthesis of reverse micelle α-FeOOH nanoparticles in ionic liquid as an only electrolyte: Inhibition of electron–hole pair recombination for efficient photoactivity

Paper ID Volume ID Publish Year Pages File Format Full-Text
40148 45845 2014 12 PDF Available
Title
Synthesis of reverse micelle α-FeOOH nanoparticles in ionic liquid as an only electrolyte: Inhibition of electron–hole pair recombination for efficient photoactivity
Abstract

•Discrete α-FeOOH nanoparticles with 5–10 nm in size were synthesized.•Reverse micelle formation was found to stabilize and miniaturize the nanoparticles.•The reverse micelle bound on the catalyst trapped the photogenerated electron.•This Fenton-like system was optimized at pH 5, instead of highly acidic condition.•H2O2 molar concentration was reduced by 10-fold compared to typical 2-CP degradation.

Discrete α-FeOOH nanoparticles (5–10 nm) were synthesized by a simple electrochemical method using an ionic liquid (IL), dodecyltrimethylammonium bromide (IL − FeOOH). IL that acts as an only electrolyte is capable of producing IL − FeOOH nanoparticles without any agglomeration. Its crystallinity, morphology, functional characteristics, and surface area were analyzed using an X-ray diffractometer, a transmission electron microscope, a Fourier-transform infrared spectrometer, and the Brunnauer–Emmett–Teller (BET) method, respectively. The characterization results verified that reverse micelle formation of IL plays an important role in the stabilization and miniaturization of the α-FeOOH nanoparticles. The activity of IL-FeOOH was tested on a photo-Fenton-like degradation of 2-chlorophenol (2-CP). Results showed that a nearly neutral condition of pH 5 was able to completely degrade 2-CP within 180 min of reaction at 50 °C, using 0.03 g L−1 of catalyst dosage and 50 mg L−1 of 2-CP initial concentration, with only a small amount of H2O2 (0.156 mM). It was found that the reverse micelle formed around the catalyst surface could trap the photogenerated electron to inhibit the recombination of photo-induced electron–hole pairs thus enhancing its catalytic activity. Kinetic studies using the Langmuir–Hinshelwood model illustrated that a surface reaction was the controlling step of the process. A reusability study showed that the catalyst was still stable after four subsequent reactions as shown by infrared spectroscopy. The results provide strong evidence to support the potential use of using IL as an alternative electrolyte to synthesize photo-Fenton-like nanocatalyst that can be used to treat organic pollutants such as 2-CP.

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Keywords
α-FeOOH nanoparticles; Ionic liquid; Reverse micelle; Photo-Fenton-like; 2-Chlorophenol
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Synthesis of reverse micelle α-FeOOH nanoparticles in ionic liquid as an only electrolyte: Inhibition of electron–hole pair recombination for efficient photoactivity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 469, 17 January 2014, Pages 33–44
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us