Fast photocatalytic degradation of dyes using low-power laser-fabricated Cu<sub>2</sub>O–Cu nanocomposites

Li, Shengling; Lin, Qingxia; Liu, Xianhua; Ding, Jie; Feng, Dong; Li, Yang; Irfan, Muhammad; Zhang, Pingping

doi:10.1039/c8ra03117g

Cited by 85 publications

(31 citation statements)

References 48 publications

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“…Thus, we can say that * OH radical played a major role in the photocatalytic degradation of Allura Red AC comparative to the other active species. [134,135] In addition to this, position of the conduction band potential (E CB ) and the valence band potential (E VB ) were calculated using the equations (3,4) E VB ¼ XÀ E e þ 0:5 ðE g Þ…”

Section: In-situ Radical Capture Experimentsmentioning

confidence: 99%

Autocombustion‐Promoted Synthesis of Lanthanum Iron Oxide: Application as Heterogeneous Catalyst for Synthesis of Piperidines, Substituted Amines and Light‐Assisted Degradations

Pratibha

Rajput

2020

ChemistrySelect

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An autocombustion technique was adopted to synthesize the Perovskite structured Lanthanum iron oxide nanoparticles (LaFeO3, abbreviated as LFO NPs). This technique offered lots of benefits such as short reaction time along with quick heating rate. LFO NPs were fabricated at different calcination temperatures (300‐800 °C) through the aid of sucrose as chelating agent. The prepared LFO NPs were well characterized by various techniques like X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FT‐IR), Vibrating sample magnetometer (VSM), Ultraviolet‐Visible spectroscopy (UV‐Vis), Brunauer–Emmett–Teller (BET), X‐ray Photo‐Electron Spectroscopy (XPS) and Transmission electron microscopy (TEM) which affirmed that highly crystalline LFO NPs were obtained at 700 °C. Subsequently, the catalytic activity of the LFO NPs was surveyed for three independent approaches: (i) for the synthesis of functionalized piperidines through activation of carbonyl groups in the reacting partners (ii) for the sunlight‐assisted mineralization of health hazardous food colorant, Allura Red AC (iii) for the hydrogenation of nitro aromatic compounds (NACs) using NaBH4 (sodium borohydride) as source of hydrogen in aqueous medium at room temperature.

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Section: In-situ Radical Capture Experimentsmentioning

confidence: 99%

Autocombustion‐Promoted Synthesis of Lanthanum Iron Oxide: Application as Heterogeneous Catalyst for Synthesis of Piperidines, Substituted Amines and Light‐Assisted Degradations

Pratibha

Rajput

2020

ChemistrySelect

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“…With time evolution, the decolorization of MB was observed in terms of the change in intensity of λ max . The percentage of decolorization was calculated as follows 69 where A 0 is the initial absorbance, and A t is the absorbance after irradiation at various time intervals.…”

Section: Resultsmentioning

confidence: 99%

Precursor- and Time-Dependent Morphological Evolution of ZnO Nanostructures for Comparative Photocatalytic Activity and Adsorption Dynamics with Methylene Blue Dye

Thakur

Mandal

2020

ACS Omega

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Diverse ZnO nanostructures were successfully fabricated at 700 °C by direct annealing of 1D Zn(II) coordination polymer precursors, namely, [Zn 2 (bpma) 2 (adc) 2 ] n , [Zn 2 (bpea) 2 (adc) 2 ] n , and {[Zn 2 (bpta) 2 (adc) 2 ]·2H 2 O} n . The effect of sacrificial ligands present in the precursors as well as a variation in the retention time (6–24 h) during their synthesis resulted in 0D nanospheres, 1D microrods, and 3D polyhedra (with a diamond-like structure) of ZnO. The as-synthesized ZnO nanostructures were characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffractometry, diffuse reflectance spectroscopy, and Raman spectroscopy. The hexagonal crystal structure was confirmed for all the ZnO samples. A lattice spacing of 0.22 nm has been observed for nanospheres, whereas a lattice spacing of 0.26 nm has been observed for the polyhedra. Their Raman spectra confirm the wurtzite phase of ZnO. UV–vis spectra of ZnO nanostructures exhibit broad peaks in the range of 350–370 nm, and the band gap energies are found to be in the range of 3.02–3.20 eV. Based on the photoluminescence spectra photocatalytic activities of the as-synthesized ZnO nanostructures calcined for 12 h were tested with methylene blue (MB) as a contaminant in an aqueous solution. These results demonstrate that the photocatalytic efficiency of polyhedra is higher than those of nanospheres and microrods. The adsorption kinetics of MB dye by these nanostructures were studied by three different kinetic models—Elovich’s, intraparticle, and pseudo-second-order. The maximum rate of adsorption was observed with the intraparticle diffusion model.

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“…The degradation degree of samples reduces as the reaction time increases, which can be ascribed to the decrease of the specific surface area resulting from the decrease of the branches on the petals. According to the Beer‐Lambert law, the degradation rate of MB was obtained by the following equation:

true Degradation rate (%) = C_{0} - C) / C_{0} \times 100 %

…”

Section: Resultsmentioning

confidence: 99%

Construction of High‐Nuclear Cu_xS_y Nanocrystalline Catalyst from High‐Nuclear Copper Cluster

et al. 2019

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A multi‐nuclear copper sulfide CuxSy with micro‐snowflake structure derived from a known four‐core copper cluster C28H36Cl6Cu4N4O5 was fabricated by hydrothermal method in mild condition. The growing process of the snowflake structure experienced from particles, to sheets and flowers, which depended on the reaction time. The prepared materials of high‐nuclear copper sulfide in different shapes were taken as catalysts for methylene blue and rhodamine B degradation. The degradation degree of the methylene blue reached up to 97.7% after 13 minutes and it needed 16 minutes for that of the rhodamine B up to 98.2%, which demonstrated that the snowflakes‐like CuxSy exhibited excellent photo‐catalytic property. Moreover, the high stability of the catalysts was confirmed by cycle experiments and SEM images.

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Fast photocatalytic degradation of dyes using low-power laser-fabricated Cu₂O–Cu nanocomposites

Abstract: Facile synthesis of Cu2O–Cu nanocomposites by using a low-power CO2 laser was realized, and the fabricated nanomaterials showed excellent photocatalytic activity for the degradation of various dyes.

Cited by 85 publications

References 48 publications

Autocombustion‐Promoted Synthesis of Lanthanum Iron Oxide: Application as Heterogeneous Catalyst for Synthesis of Piperidines, Substituted Amines and Light‐Assisted Degradations

Autocombustion‐Promoted Synthesis of Lanthanum Iron Oxide: Application as Heterogeneous Catalyst for Synthesis of Piperidines, Substituted Amines and Light‐Assisted Degradations

Precursor- and Time-Dependent Morphological Evolution of ZnO Nanostructures for Comparative Photocatalytic Activity and Adsorption Dynamics with Methylene Blue Dye

Construction of High‐Nuclear Cu_xS_y Nanocrystalline Catalyst from High‐Nuclear Copper Cluster

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Fast photocatalytic degradation of dyes using low-power laser-fabricated Cu2O–Cu nanocomposites

Abstract: Facile synthesis of Cu2O–Cu nanocomposites by using a low-power CO2 laser was realized, and the fabricated nanomaterials showed excellent photocatalytic activity for the degradation of various dyes.

Cited by 85 publications

References 48 publications

Autocombustion‐Promoted Synthesis of Lanthanum Iron Oxide: Application as Heterogeneous Catalyst for Synthesis of Piperidines, Substituted Amines and Light‐Assisted Degradations

Autocombustion‐Promoted Synthesis of Lanthanum Iron Oxide: Application as Heterogeneous Catalyst for Synthesis of Piperidines, Substituted Amines and Light‐Assisted Degradations

Precursor- and Time-Dependent Morphological Evolution of ZnO Nanostructures for Comparative Photocatalytic Activity and Adsorption Dynamics with Methylene Blue Dye

Construction of High‐Nuclear CuxSy Nanocrystalline Catalyst from High‐Nuclear Copper Cluster

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Fast photocatalytic degradation of dyes using low-power laser-fabricated Cu₂O–Cu nanocomposites

Construction of High‐Nuclear Cu_xS_y Nanocrystalline Catalyst from High‐Nuclear Copper Cluster