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Active Specie
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Jiexiang Xia – One of the best experts on this subject based on the ideXlab platform.
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Boosting photocatalytic degradation of RhB via interfacial electronic effects between Fe-based ionic liquid and g-C3N4
KeAi, 2019Co-Authors: Bin Wang, Yuhong Huang, Jiexiang Xia, Wenshuai ZhuAbstract:The Fe-based ionic liquid doped g-C3N4 (FeCN) photocatalyst was firstly prepared base on ultrathin g-C3N4 obtained by multiple calcination method with a metal-based reActive ionic liquid [Omim]FeCl4 for the degradation of Rhodamine B (RhB). Experimental results revealed that Fe3+ Species were doped into the framework of g-C3N4. The effect of the amount of Fe-doping on the catalytic activity was performed. The result showed that the FeCN could effectively degrade RhB under the condition of visible light irradiation. The photocurrent analysis showed that the incorporation of Fe3+ into g-C3N4 material could accelerate the separation of the photogenerated carriers significantly. At the same time, the reActive Species generated during the photodegradation process were tested by radicals trapping experiments and electron spin resonance (ESR). It was proposed that the synergistic effect of O2•− and ·OH contributed to degrade RhB efficiently. Keywords: g-C3N4, [Omim]FeCl4, Photocatalytic, Visible light, Active Specie
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Synthesis of g-C3N4/Bi4O5Br2 via reactable ionic liquid and its cooperation effect for the enhanced photocatalytic behavior towards ciprofloxacin degradation
Journal of Photochemistry and Photobiology A: Chemistry, 2017Co-Authors: Junze Zhao, Pengfei Zhang, Jiexiang XiaAbstract:Abstract A novel visible-light-driven g-C 3 N 4 /Bi 4 O 5 Br 2 composite material has been prepared via an ionic liquid 1-hexadecyl-3-methylimidazolium bromide ([C 16 mim]Br) assisted solvothermal method. In this process, the ionic liquid [C 16 mim]Br played an important role as the solvent, dispersing agent and reactant at the same time. Colorless antibiotic ciprofloxacin (CIP) was chosen as the target pollutant to evaluate the as-prepared photocatalyst. Compared with the pure Bi 4 O 5 Br 2 , the as-prepared g-C 3 N 4 /Bi 4 O 5 Br 2 composites showed the enhanced photocatalytic activity under visible light irradiation. 10 wt% g-C 3 N 4 /Bi 4 O 5 Br 2 composite exhibited the best photodegradation performance among the g-C 3 N 4 /Bi 4 O 5 Br 2 composites. The increased light harvseting ability and photogenerated charge carriers separation efficiency contribute to the improved photocatalytic performance for the as-prepared composites. Holes were determined to be the main Active Specie during the photocatalytic degradation.
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La3+ doped BiOBr microsphere with enhanced visible light photocatalytic activity
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2017Co-Authors: Sheng Yin, Wenmin Fan, Jiaxin Yan, Jiexiang XiaAbstract:Abstract In this work, La 3+ doped BiOBr microspheres have been prepared via 1-hexadecyl-3-methy-limidazolium bromine ([C 16 mim]Br) assisted solvothermal process. In this process, [C 16 mim]Br acted not only as the template but also the Br source and was good for the even dispersion of La 3+ . The morphology and compositional characteristics of the La 3+ doped BiOBr microspheres were investigated by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The photocatalytic activity of the La 3+ doped BiOBr microspheres was evaluated by the degradation of rhodamine B (RhB), colorless antibiotic agent ciprofloxacin (CIP) under visible light irradiation. The as-prepared La 3+ doped BiOBr microspheres exhibited much higher photocatalytic activity than pure BiOBr, and the 1 wt% La 3+ doped BiOBr showed the highest photocatalytic activity. The enhanced photocatalytic activities were ascribed to the narrowed band gap and the efficient separation of electron hole pairs. The free radical trapping experiments suggested that the holes were the main Active Specie for the photocatalytic degradation. A possible photocatalytic mechanism of La 3+ doped BiOBr has been proposed.
Shangpan Huang – One of the best experts on this subject based on the ideXlab platform.
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PH-controlled MnFe2O4@ SnS2 nanocomposites for the visible-light photo-Fenton degradation
Materials Research Bulletin, 2020Co-Authors: Wenhua Zhao, Zhiqiang Wei, Xudong Zhang, Meijie Ding, Shangpan HuangAbstract:Abstract The magnetically separable MnFe2O4 nanoparticles (15–50 nm) are synthesized onto SnS2 microflowers (diameter 1–1.5 μm, thickness 50 nm), fabricating a direct Z-scheme MnFe2O4@SnS2 heterojunction nanocomposite via two-step hydrothermal. The MnFe2O4@SnS2 composites with an appropriate SnS2 content exhibit enhanced photo-Fenton degradation performances to make efficient separation of photoexcited electron/hole pairs. In the photo-Fenton degradation tests, MnFe2O4@SnS2-2 shows excellent performance that 92.08 % of methylene blue (MB) could be photocatalyzed within120 min with pH = 9 and 1.5 mL H2O2, which is about 2.43 times than that of bare MnFe2O4 nanoparticles. In general, the Mn2+ and Fe2+ in-situ regenerated through accepting electrons from the cathode as the result of the Z-scheme electron transfer. Moreover, over 88 % of MB is still removed in the 5th run is attributed that SnS2 driven also extend the longevity of the MnFe2O4 catalyst. Different capture agents IPA, BQ and TEOA investigation displays that ·OH is the main Active Specie.
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Magnetic recyclable MnFe2O4/CeO2/SnS2 ternary nano-photocatalyst for photo-Fenton degradation
Applied Catalysis A: General, 2020Co-Authors: Wenhua Zhao, Shangpan Huang, Zhiqiang Wei, Xudong Zhang, Meijie Ding, Shaoguang YangAbstract:Abstract The novel MnFe2O4/CeO2/SnS2 (1:0.2:0.5, 1:0.2:1, 1:0.2:1.5) nano-photocatalysts with magnetic recyclability were prepared via a facile hydrothermal route. MnFe2O4 and CeO2 nanoparticles are decorated onto SnS2 flowers to fabricate a MnFe2O4/CeO2/SnS2 ternary heterojunction. SnS2 is an excellent connector between MnFe2O4 and CeO2 in synthesized MnFe2O4/CeO2/SnS2 composite with a suitable band gap to accelerate methylene blue (MB) of photodegradation, which is attributed to its highly efficient separation of photogenerated electron-hole pairs. Compared with pure MnFe2O4, the photo-Fenton degradation of the MnFe2O4/CeO2/SnS2 composites significantly enhance in the presence of H2O2. Notably, the MnFe2O4/CeO2/SnS2 (1:0.2:1) composite displays a slightly decreased charge-transfer resistance and an increased photocurrent density with good cycling stability after five runs, exhibiting the excellent photocatalytic and photo-Fenton performance under simulated sunlight. Consequently, the photo-Fenton mechanism of MnFe2O4/CeO2/SnS2 is explained on the basis of coexistence of Mn2+/Mn3+ and Fe3+/Fe2+ redox couples. Meanwhile, OH is the main Active Specie.
Daniil M. Itkis – One of the best experts on this subject based on the ideXlab platform.
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Applying the deconvolution approach in order to enhance RRDE time resolution: Experimental noise and imposed limitations
Electrochimica Acta, 2019Co-Authors: Artem V. Sergeev, Alexander V. Chertovich, Tatiana K. Zakharchenko, Daniil M. ItkisAbstract:Abstract The ring electrode of an RRDE setup is commonly used to detect redox Active Species produced at the disk electrode. It is especially useful when some side processes occur at the disk (e.g. passivation film growth) along with a main electrochemical reaction of interest, which produces a soluble redox-Active Specie. Unfortunately, the detected ring current signal is a delayed and smeared-out representation of the disk faradaic process so that fast changes of its magnitude cannot be studied. The deconvolution approach is a mathematical data processing procedure that enables reconstruction of the disk signal with a hypothetically infinite accuracy. There are, however, practical limitations arising mainly from inevitable presence of noise in the measured ring current used for the reconstruction. In this paper the deconvolution approach is discussed in details and its applicability is investigated basing on a series of experiments with a model system. A procedure to filter out spurious artifacts from the reconstructed disk signal is proposed and tested.
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Applying the deconvolution approach in order to enhance RRDE time resolution: practical issues and limitations
arXiv: Applied Physics, 2018Co-Authors: Artem V. Sergeev, Daniil M. Itkis, Alexander V. ChertovichAbstract:A ring electrode of an RRDE setup is often used to detect a redox Active Specie produced at the disk electrode. It is especially useful when some side processes occur at the disk (e.g. passivation film growth) along with the main electrochemical reaction that produces the soluble redox-Active Specie. Unfortunately, the detected ring signal is delayed and smeared so that fast changes of the disk processes intensities cannot be studied. The deconvolution approach is a mathematical data processing procedure that enables reconstruction of the disk signal with hypothetically infinite accuracy. Although there are practical limitations arising mainly from impossibility of exact measurement of the impulse response function and inevitable presence of a noise component in the ring signal used for the reconstruction. In this work a series of calculations were performed in order to investigate the applicability and reliability of the deconvolution approach. Also a procedure to filter out spurious artifacts from the reconstructed disk signal was suggested and tested.