Green synthesis of the reduced graphene oxide–CuI quasi-shell–core nanocomposite: A highly efficient and stable solar-light-induced catalyst for organic dye degradation in water

Choi, Jae-Sun; Reddy, D. Amaranatha; Islam, M. Robiul; Seo, Bora; Kim, Tae Kyu

doi:10.1016/j.apsusc.2015.07.170

Cited by 50 publications

(10 citation statements)

References 47 publications

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“…However, in this work, BiSnSbO 6 which owned higher photoluminescence spectra intensity exhibited higher photocatalytic activity than N-doped TiO 2 . Above-mentioned discrepancy might be caused by oxygen vacancies and crystalline defects [ 58 , 59 , 60 , 61 ] on the surface of BiSnSbO 6 . During the preparation of BiSnSbO 6 , the volatilization of Bi 2 O 3 and oxygen vacancies might appear on the surface of the BiSnSbO 6 samples when the calcination temperature was higher than 820 °C [ 62 ].…”

Section: Resultsmentioning

confidence: 99%

Photophysical and Photocatalytic Properties of BiSnSbO6 under Visible Light Irradiation

Luan

Huang

2018

Materials

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BiSnSbO6 with strong photocatalytic activity was first fabricated by a high-temperature, solid-state sintering method. The resulting BiSnSbO6 was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectroscopy (XPS). The results showed that BiSnSbO6, with a pyrochlore structure and a cubic crystal system by a space group Fd3m, was well crystallized. The lattice parameter or the band gap of BiSnSbO6 was 10.234594 Å or 2.83 eV. Compared with N-doped TiO2, BiSnSbO6 showed higher photocatalytic activity in the degradation of benzotriazole and rhodamine B. The apparent first-order rate constant for BiSnSbO6 in the degradation of benzotriazole and rhodamine B was 0.0182 min−1 and 0.0147 min−1, respectively. On the basis of the scavenger experiment, during the photocatalytic process, the main active species were arranged in order of increasing photodegradation rate: •OH < •O2− < h+. The removal rate of benzotriazole or rhodamine B was approximately estimated to be 100% with BiSnSbO6 as a photocatalyst after 200 min visible-light irradiation. Plentiful CO2 produced by the experiment indicated that benzotriazole or rhodamine B was continuously mineralized during the photocatalytic process. Finally, the possible photodegradation pathways of benzotriazole and rhodamine B were deduced.

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Section: Resultsmentioning

confidence: 99%

Photophysical and Photocatalytic Properties of BiSnSbO6 under Visible Light Irradiation

Luan

Huang

2018

Materials

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“…The main C 1s corresponds to adventitious carbon species presenting a band located at 284.4 eV [44]. The small shoulder at 286.4 and 288.9 eV could be accounted for with the C-N-C and C-(N)3 groups of g-C3N4, respectively [26,45,46]. In addition, the regional spectrum of N 1s for 0.05Fe-CT as seen in Figure 6d could be fitted into two peaks at 399.2 and 400.4 eV, with the former ascribed to C-N=C [34] and the latter to the N-(C)3 of the g-C3N4 [26].…”

Section: Phase Structures and Morphologymentioning

confidence: 99%

Fabrication of a Z-Scheme g-C3N4/Fe-TiO2 Photocatalytic Composite with Enhanced Photocatalytic Activity under Visible Light Irradiation

Zhu

Murugananthan

et al. 2018

Catalysts

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Abstract:In the present study, a nanocomposite material g-C 3 N 4 /Fe-TiO 2 has been prepared successfully by a simple one-step hydrothermal process and its structural properties were thoroughly studied by various characterization techniques, such as X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy, electron paramagnetic resonance (EPR) spectrum, X-ray photoelectron spectroscopy (XPS), and UV-vis diffuse reflectance spectrometry (UV-vis DRS). The performance of the fabricated composite material towards the removal of phenol from aqueous phase was systematically evaluated by a photocatalytic approach and found to be highly dependent on the content of Fe 3+ . The optimum concentration of Fe 3+ doping that showed a dramatic enhancement in the photocatalytic activity of the composite under visible light irradiation was observed to be 0.05% by weight. The separation mechanism of photogenerated electrons and holes of the g-C 3 N 4 /Fe-TiO 2 photocatalysts was established by a photoluminescence technique in which the reactive species generated during the photocatalytic treatment process was quantified. The enhanced photocatalytic performance observed for g-C 3 N 4 -Fe/TiO 2 was ascribed to a cumulative impact of both g-C 3 N 4 and Fe that extended its spectrum-absorptive nature into the visible region. The heterojunction formation in the fabricated photocatalysts not only facilitated the separation of the photogenerated charge carriers but also retained its strong oxidation and reduction ability.

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“…CuI is characterized by ah igh conductivity and exhibits ah igh opticalt ransparency under visible light.T hese properties make CuI thin films very useful in dye-sensitizeds olar cells [27] or as hole-injection layers in organic light-emitting diodes. [31] In our recent papers on CO 2 utilization,w ed escribed semiconductor systems capable of one- [32,33] and multi-electron reductiono fC O 2 , [14] as wella sahybrid photocatalytic-enzymatic reduction of CO 2 to methanol. [30] However,t he activity of CuI in photocatalytic processes remains unraveled.…”

Section: Introductionmentioning

confidence: 99%

“…Very recently, aC uI-RGO (reduced graphene oxide) system was tested in photocatalytic degradation of organic dyes;h owever, in these studies CuI did not play the role of ap hotocatalyst (did not absorb light), but it was used as ac ore in the coreshell structure of CuI-RGO. [31] In our recent papers on CO 2 utilization,w ed escribed semiconductor systems capable of one- [32,33] and multi-electron reductiono fC O 2 , [14] as wella sahybrid photocatalytic-enzymatic reduction of CO 2 to methanol. [34,35] The use of p-type photocatalysts for CO 2 reduction can be justified by considerably low potentials of conduction band edgeso ffering significantly better reduction properties compared to those characteristic for am ajority of n-type materials.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Carbon Dioxide Reduction at p‐Type Copper(I) Iodide

et al. 2016

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A p-type semiconductor, CuI, has been synthesized, characterized, and tested as a photocatalyst for CO reduction under UV/Vis irradiation in presence of isopropanol as a hole scavenger. Formation of CO, CH , and/or HCOOH was observed. The photocatalytic activity of CuI was attributed to the very low potential of the conduction band edge (i.e., -2.28 V vs. NHE). Photocurrents generated by the studied material confirm a high efficiency of the photoinduced interfacial electrontransfer processes. Our studies show that p-type semiconductors may be effective photocatalysts for CO reduction, even better than extensively studied n-type titanium dioxide, owing to the low potential of the conduction band edge.

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Green synthesis of the reduced graphene oxide–CuI quasi-shell–core nanocomposite: A highly efficient and stable solar-light-induced catalyst for organic dye degradation in water

Cited by 50 publications

References 47 publications

Photophysical and Photocatalytic Properties of BiSnSbO6 under Visible Light Irradiation

Photophysical and Photocatalytic Properties of BiSnSbO6 under Visible Light Irradiation

Fabrication of a Z-Scheme g-C3N4/Fe-TiO2 Photocatalytic Composite with Enhanced Photocatalytic Activity under Visible Light Irradiation

Photocatalytic Carbon Dioxide Reduction at p‐Type Copper(I) Iodide

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