Cubic Cu2O nanoparticles decorated on TiO2 nanofiber heterostructure as an excellent synergistic photocatalyst for H2 production and sulfamethoxazole degradation

Karthikeyan, S.; Chuaicham, Chitiphon; Balakumar, Vellaichamy; Li, Wei; Zhuang, Wei; Lü, Xiaohua; Ohtani, Bunsho; Sasaki, Keiko

doi:10.1016/j.apcatb.2021.120221

Cited by 91 publications

(42 citation statements)

References 47 publications

(56 reference statements)

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“…(CB: Conduction band, VB: Valence band, E f : Fermi level, Δ E C : Conduction bands offset, Δ E V : Valence bands offset). Reprinted from [ 229 ] with the permission of Elsevier.…”

Section: Figurementioning

confidence: 99%

Copper Oxide-Based Photocatalysts and Photocathodes: Fundamentals and Recent Advances

Baran¹,

Visibile

Busch

et al. 2021

Molecules

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This work aims at reviewing the most impactful results obtained on the development of Cu-based photocathodes. The need of a sustainable exploitation of renewable energy sources and the parallel request of reducing pollutant emissions in airborne streams and in waters call for new technologies based on the use of efficient, abundant, low-toxicity and low-cost materials. Photoelectrochemical devices that adopts abundant element-based photoelectrodes might respond to these requests being an enabling technology for the direct use of sunlight to the production of energy fuels form water electrolysis (H2) and CO2 reduction (to alcohols, light hydrocarbons), as well as for the degradation of pollutants. This review analyses the physical chemical properties of Cu2O (and CuO) and the possible strategies to tune them (doping, lattice strain). Combining Cu with other elements in multinary oxides or in composite photoelectrodes is also discussed in detail. Finally, a short overview on the possible applications of these materials is presented.

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“…(CB: Conduction band, VB: Valence band, E f : Fermi level, Δ E C : Conduction bands offset, Δ E V : Valence bands offset). Reprinted from [ 229 ] with the permission of Elsevier.…”

Section: Figurementioning

confidence: 99%

Copper Oxide-Based Photocatalysts and Photocathodes: Fundamentals and Recent Advances

Baran¹,

Visibile

Busch

et al. 2021

Molecules

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“…Compared to Fe/Mt/TiO 2, the xFe-Mt/(1 − x)Fe-TiO 2 composite showed a slight red shift in the absorption edge, and such an extension in the absorption band influenced the optical properties of samples significantly. By using the Tauc plotting Kubelka-Munk function versus energy, the optical bandgap energy (Eg) of Fe-Mt can be evaluated, according to Equation (1) (Figure 6b) [54][55][56]:…”

Section: Investigation Of Optical and Charge Separation Propertiesmentioning

confidence: 99%

Fabrication of Adsorbed Fe(III) and Structurally Doped Fe(III) in Montmorillonite/TiO2 Composite for Photocatalytic Degradation of Phenol

et al. 2021

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The Fe(III)-doped montmorillonite (Mt)/TiO2 composites were fabricated by adding Fe(III) during or after the aging of TiO2/Ti(OH)4 sol–gel in Mt, named as xFe-Mt/(1 − x)Fe-TiO2 and Fe/Mt/TiO2, respectively. In the xFe-Mt/(1 − x)Fe-TiO2, Fe(III) cations were expected to be located in the structure of TiO2, in the Mt, and in the interface between them, while Fe(III) ions are physically adsorbed on the surfaces of the composites in the Fe/Mt/TiO2. The narrower energy bandgap (Eg) lower photo-luminescence intensity were observed for the composites compared with TiO2. Better photocatalytic performance for phenol degradation was observed in the Fe/Mt/TiO2. The 94.6% phenol degradation was due to greater charge generation and migration capacity, which was confirmed by photocurrent measurements and electrochemical impedance spectroscopy (EIS). The results of the energy-resolved distribution of electron traps (ERDT) suggested that the Fe/Mt/TiO2 possessed a larger amorphous rutile phase content in direct contact with crystal anatase than that of the xFe-Mt/(1 − x)Fe-TiO2. This component is the fraction that is mainly responsible for the photocatalytic phenol degradation by the composites. As for the xFe-Mt/(1 − x)Fe-TiO2, the active rutile phase was followed by isolated amorphous phases which had larger (Eg) and which did not act as a photocatalyst. Thus, the physically adsorbed Fe(III) enhanced light adsorption and avoided charge recombination, resulting in improved photocatalytic performance. The mechanism of the photocatalytic reaction with the Fe(III)-doped Mt/TiO2 composite was proposed.

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“…However, the photocatalytic activity of Cu-HyS has never been reported and studied. Photocatalysis is a unique approach that is widely used and utilized in a variety of interdisciplinary study areas, including the degradation of a variety of inorganic/organic hazardous pollutants in wastewater, air purification, insecticides, and so on [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Hydrotalcite-like Copper Hydroxyl Salts as a Photocatalyst and Adsorbent for Hexavalent Chromium Removal

et al. 2022

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Cu-HyS-urea and Cu-HyS-NaOH, which are hydrotalcite-like copper hydroxyl salts, were prepared by two different methods, urea hydrolysis and precipitation, respectively. Both synthesis methods provided the successful formation of a copper hydroxyl salt, Cu2(OH)3NO3. From XRD and UV-DRS results, the product from the urea hydrolysis methods (Cu-HyS-urea) displayed higher crystallinity, small bandgap energy (Eg), and high light absorption ability because of some intercalated carbonate anions. For the Cr(VI) removal test, the Cu-HyS-NaOH showed superior adsorption of Cr(VI) than Cu-HyS-urea due to a higher specific surface area, confirmed by BET analysis. However, the Cu-HyS-urea presented higher photocatalytic Cr(VI) reduction under light irradiation than Cu-HyS-NaOH, owing to narrow Eg, less recombination, and a high transfer of the photogenerated charge carriers, proven by the results from photoluminescence, photocurrent density, and electrochemical impedance spectroscopy. Thus, this work provides a new function of the hydrotalcite-like copper hydroxyl salts (Cu-HyS-urea and Cu-HyS-NaOH) that can be utilized not only for adsorption of Cr(VI) but also as photocatalysts for Cr(VI) reduction under light irradiation.

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Cubic Cu2O nanoparticles decorated on TiO2 nanofiber heterostructure as an excellent synergistic photocatalyst for H2 production and sulfamethoxazole degradation

Cited by 91 publications

References 47 publications

Copper Oxide-Based Photocatalysts and Photocathodes: Fundamentals and Recent Advances

Copper Oxide-Based Photocatalysts and Photocathodes: Fundamentals and Recent Advances

Fabrication of Adsorbed Fe(III) and Structurally Doped Fe(III) in Montmorillonite/TiO2 Composite for Photocatalytic Degradation of Phenol

Fabrication of Hydrotalcite-like Copper Hydroxyl Salts as a Photocatalyst and Adsorbent for Hexavalent Chromium Removal

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