Cu2O cubic and polyhedral structures versus commercial powder: Shape effect on photocatalytic activity under visible light

Plascencia-Hernández, Fernando; Luna, Ana L.; Colbeau‐Justin, Christophe; Santiago, Patrícia; García‐Rocha, M.; Valverde-Aguilar, Guadalupe; Valenzuela, Miguel A.

doi:10.1016/j.jscs.2019.05.007

Cited by 19 publications

(6 citation statements)

References 51 publications

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“…This finding is also in accordance with the recently reported TRMC measurements of Cu 2 O, demonstrating a much higher charge mobility of polyhedral Cu 2 O when compared to cubic Cu 2 O. 57 The effective carrier lifetimes of the two Cu 2 O samples were determined from the decay of their TRMC signals as shown in Fig. 6a.…”

Section: Paper Materials Advancessupporting

confidence: 91%

Facet-dependent carrier dynamics of cuprous oxide regulating the photocatalytic hydrogen generation

Toe

Lamers

Dittrich³

et al. 2022

Mater. Adv.

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Section: Paper Materials Advancessupporting

confidence: 91%

Facet-dependent carrier dynamics of cuprous oxide regulating the photocatalytic hydrogen generation

Toe

Lamers

Dittrich³

et al. 2022

Mater. Adv.

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“…Figure 6a shows the DRS spectra of all the samples. The samples exhibited a wide absorption band ranging from 400 nm to 800 nm [44]. Samples 100C and 75C25N had higher absorption intensities, indicating that they can absorb more photons and, in turn, enhance the photocatalytic activity [45].…”

Section: Uv-vis Diffuse Reflectance Spectroscopymentioning

confidence: 99%

The Effect of Composition on the Properties and Application of CuO-NiO Nanocomposites Synthesized Using a Saponin-Green/Microwave-Assisted Hydrothermal Method

Al-Yunus,

Al-Arjan,

Traboulsi

et al. 2024

IJMS

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In this study, we explored the formation of CuO nanoparticles, NiO nanoflakes, and CuO-NiO nanocomposites using saponin extract and a microwave-assisted hydrothermal method. Five green synthetic samples were prepared using aqueous saponin extract and a microwave-assisted hydrothermal procedure at 200 °C for 30 min. The samples were pristine copper oxide (100C), 75% copper oxide–25% nickel oxide (75C25N), 50% copper oxide–50% nickel oxide (50C50N), 25% copper oxide–75% nickel oxide (25C75N), and pristine nickel oxide (100N). The samples were characterized using FT-IR, XRD, XPS, SEM, and TEM. The XRD results showed that copper oxide and nickel oxide formed monoclinic and cubic phases, respectively. The morphology of the samples was useful and consisted of copper oxide nanoparticles and nickel oxide nanoflakes. XPS confirmed the +2 oxidation state of both the copper and nickel ions. Moreover, the optical bandgaps of copper oxide and nickel oxide were determined to be in the range of 1.29–1.6 eV and 3.36–3.63 eV, respectively, and the magnetic property studies showed that the synthesized samples exhibited ferromagnetic and superparamagnetic properties. In addition, the catalytic activity was tested against para-nitrophenol, demonstrating that the catalyst efficiency gradually improved in the presence of CuO. The highest rate constants were obtained for the 100C and 75C25N samples, with catalytic efficiencies of 98.7% and 78.2%, respectively, after 45 min.

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“…The hydroxyl radical is more active than the free radicals such as •O2 − and •HO2 that also involved in the process of oxidation. The chemical reactions that cause the photodegradation of the dyes are shown in the equations (7)(8)(9)(10)(11)(12)(13)(14)(15)(16) As shown in the above reaction, traps such as O2 and H + prevented their recombination by trapping electron and holes.…”

Section: Photodegradationmentioning

confidence: 99%

“…Polyhedral Cu2O decreased the initial methyl orange (MO) concentration by adsorption followed by photocatalytic activity. On the other hand, the cubic nanoparticles did not show absorption (MO), but its photocatalytic activity was higher than that of polyhedral particles which can be due to a lower percentage of oxygen defects ( oxygen vacancies ) and prevention of the electron and hole recombination [15,16]. The catalytic activity of (110) crystal planes is greater than that of the octahedral (111) crystal planes [17].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation/Adsorption of Carcinogenic Azo Dye Disperse Red 176.1 by Nanocage Cu2o as a Dual Function Catalyst on the Visible-Light

Nassaji-Jahromi

Fazaeli

Behjatmanesh–Ardakani

et al. 2020

J. Chil. Chem. Soc.

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Refining and disposal of wastewater is an important concern of textile industries due to the presence of carcinogenic azo dyes. The monoazo dye Disperse Red 167.1 (DR167.1) is used in dyeing polyester and cotton fibers. In this study, Cage Cu2O particles was synthesized by using non-toxic and inexpensive materials as a bi-functional material that can mineralize this pollutant under light irradiation and dark media. The samples were characterized by FESEM, XRD, BET / BJH, FTIR, and DRS techniques. The crystallite size was almost 24.3 nm by the Williamson-Hall. Direct band gap energy was equal to 2.08 eV by Kubelka-Munk. It revealed a greater photocatalytic performance in visible light than UV-C and it absorbed 49% of the dye within 10 minutes in the darkness. The oxidation results indicated that at pH equal to 6.44 without the presence of H2O2, 0.75 mg.L-1 of cage Cu2O and of 94 mg.L-1 dye concentration yielded 91 % removal and mineralization during 10 min. Removal under the visible light irradiation increased to 93% upon increasing the time to 40 min. as dye concentration rose from 94 to 340 mg.L-1 , with a slight reduction in the efficiency of the photocatalytic degradation process, the efficiency was obtained as 91%. Koble Corrigan model was found as the best isotherm model. Reaction kinetics followed the pseudo-second order model. Overall, due to its absorption and removal of dyes in a short time, it can be a good candidate for textile wastewater treatment.

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Cu2O cubic and polyhedral structures versus commercial powder: Shape effect on photocatalytic activity under visible light

Cited by 19 publications

References 51 publications

Facet-dependent carrier dynamics of cuprous oxide regulating the photocatalytic hydrogen generation

Facet-dependent carrier dynamics of cuprous oxide regulating the photocatalytic hydrogen generation

The Effect of Composition on the Properties and Application of CuO-NiO Nanocomposites Synthesized Using a Saponin-Green/Microwave-Assisted Hydrothermal Method

Photocatalytic Degradation/Adsorption of Carcinogenic Azo Dye Disperse Red 176.1 by Nanocage Cu2o as a Dual Function Catalyst on the Visible-Light

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