Facile assembly of CdS-reduced graphene oxide heterojunction with enhanced elimination performance for organic pollutants in wastewater

Wei, Xiangnan; Ou, C. G.; Guan, Xinxin; Peng, Zhikun; Zheng, Xiu-Cheng

doi:10.1016/j.apsusc.2018.11.102

Cited by 40 publications

(5 citation statements)

References 43 publications

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“…In the Raman spectrum of rGO (Figure b), two distinctive peaks located at 1355 and 1598 cm –1 are attributed to the D and G bands of rGO, respectively (Figure b). The D band reflects the defects due to the sp 3 hybridized C atoms, and the G band represents the graphite hexagonal pinch mode associated with the sp 2 hybridized C atoms. , The intensity ratio of the D band ( I D ) to the G band ( I G ), I D / I G , hints at the interaction between rGO and FLP after the construction of the heterojunctions. A relatively slight decrease in the intensity ratio of I D / I G can be speculated as the interaction of P atoms with the functional groups in rGO, which was also supported by the shift in the (002) plane in the XRD spectrum.…”

Section: Resultsmentioning

confidence: 99%

Reduced Graphene Oxide/Few-Layer Phosphorene Binary Heterojunctions as Metal-Free Photocatalysts for the Sustainable Photoredox C–H Arylation of Heteroarenes

Turbedaroglu,

Kubanaliev,

Alemdar

et al. 2024

ACS Sustainable Chem. Eng.

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Herein, we report the fabrication of few-layer phosphorene (FLP)/reduced graphene oxide (rGO) binary heterojunctions as metal-free photocatalysts for the direct C−H arylation of heteroarenes under visible light irradiation. The FLP/ rGO heterojunctions were prepared by mixing the solutions of well-exfoliated rGO and FLP nanosheets in an ultrasonic bath, resulting in a well-coupled structure between rGO and FLP. Characterization revealed enhanced stability, charge separation efficiency, and extended charge transfer ability in the heterojunction compared to the pristine materials. Studying different FLP to rGO mass ratios helped to find the optimum synergy where the materials exhibited the highest photocatalytic activity, and the optimized FLP/rGO catalyst with 30% FLP yielded the desired products with the highest photocatalytic efficiency in the C−H arylation of aryl diazonium salts and heteroarenes (24 examples in total). Notably, aryl diazonium salts with electron-withdrawing groups achieved high yields in the range of 68−90%. The FLP/rGO heterojunctions were successfully applied in synthesizing dantrolene, a commercially available drug, yielding 41% yield for C−H arylation and 90% yield for subsequent synthesis. The heterojunctions demonstrated excellent reusability, maintaining high catalytic activity over five cycles with only a 6% decrease in their initial activity. Mechanistic studies suggest a plausible single electron transfer mechanism wherein photogenerated electrons are transferred from FLP/rGO to aryl diazonium salts, forming biaryl radical intermediates and subsequent products. Overall, the FLP/ rGO binary heterojunctions have been demonstrated to be efficient and sustainable metal-free photocatalysts for C−H arylation reactions, showcasing a broad substrate scope and potential applications in synthetic chemistry and pharmaceutical synthesis.

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Section: Resultsmentioning

confidence: 99%

Reduced Graphene Oxide/Few-Layer Phosphorene Binary Heterojunctions as Metal-Free Photocatalysts for the Sustainable Photoredox C–H Arylation of Heteroarenes

Turbedaroglu,

Kubanaliev,

Alemdar

et al. 2024

ACS Sustainable Chem. Eng.

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“…When supported on graphitic materials, these semiconductors improve the conductivity for electron capture and transport [51,[117][118][119][120][121][122][123]. There are several methods of synthesis of metal sulfides coupled to rGO and GO substrates, which comprise solid-state, sonochemical, microwave irradiation, solvothermal, and hydrothermal methods [113,120,121,[124][125][126][127][128][129][130][131][132][133][134][135][136][137][138]. Our research group has developed a single-source method to prepare GO-based composites having supported metal sulfides.…”

Section: Application Of Carbon-based Semiconductor Nanostructures In ...mentioning

confidence: 99%

“…Although CdS presents serious drawbacks for practical applications due to its wellknown toxicity, research on CdS-based nanomaterials provide helpful insights concerning the visible-light response and underlying mechanisms in semiconductor photocatalysis [139]. There are a number of studies reporting visible-light active heterostructures of CdS/rGO and CdS/GO, which were investigated as photocatalysts for the degradation of organic dyes [124,126,128]. These heterostructures showed higher photocatalytic efficiency than bare CdS and could be used for up to four cycles, without loss of activity.…”

Section: Application Of Carbon-based Semiconductor Nanostructures In ...mentioning

confidence: 99%

Nanomaterials of Carbon and Metal Sulfides in Photocatalysis

Estrada¹,

Lopes²,

Trindade³

2023

Photocatalysts - New Perspectives

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Heterogeneous semiconductor photocatalysis has received much interest because of its applications in important global energy and environmental challenges in a cost-effective sustainable way. The photocatalytic efficiency of semiconductor photocatalysts under solar irradiation has been pointed out by difficulties associated with low visible-light absorption range, fast recombination of photogenerated carriers, and low chemical stability in operational conditions. Graphitic materials have attracted great interest due to properties, such as high surface area, mechanical strength, and photochemical stability. Thus, their combination with metal sulfides, has been explored as promising strategies to produce new photocatalysts. These nanocomposites show great potential in photodegradation of contaminants of emerging concern (CEC), which might be detected in water sources, such as traces of Pharmaceutics and pesticides. Here, we briefly review fundamental principles photocatalysis in general, with the focus on the use of carbon-nanomaterials of distinct structural dimensionalities associated with nanocrystalline metal sulfides, envisaging their application as heterogeneous photocatalysts for water remediation. Key aspects concerning the photocatalyst properties, such as light absorption, charge separation and transfer, and stability, are also approached. Graphene and graphene derivatives have demonstrated great potential for increasing photogenerated charge-carrier separation and migration efficiency, as well as in extending the light absorption range and adsorption capacity.

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“…Graphene and graphene derivatives are being used because of their special properties of high optical transparency, high electrical conductivity, and charge transport as well as have a large surface area Li et al, 2018). Hybrid catalysts containing graphene oxide (GO) or reduced graphene oxide (RGO) seem to have greater absorptivity (Xie et al, 2015), rapid bonding of organic molecules to the surface active sites with functional groups (Wei et al, 2019), rapid charge separation, increased photocatalytic activity, and high conductivity with a large surface area (Akyuz et al, 2016). For instance, RGO shows a specific narrow band gap energy and visible light response eliminates deficiencies in degradation of dye (Gonçalves et.…”

Section: Introductionmentioning

confidence: 99%

A Study on Photocatalytic Efficiency of Hybrid Titanium Dioxide Nanowires/Reduced Graphene Oxide (TiO2NWs/RGO) for Degradation of Methyl Orange Dye

AZAM¹

2022

ASMScJ

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The major concern of this research is to improve photocatalytic efficiency by implementation of hybrid TiO2NWs/RGO for dye degradation. The TiO2NWs/RGO was prepared using fabrication method. Titanium (IV) oxide powder and graphite were used as precursors to synthesis of TiO2NWs and RGO, respectively. Physical and chemical properties of the photocatalyst was investigated by Fourier Transform Infrared (FTIR), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Adsorption-desorption nitrogen analysis and their photocatalytic efficiency was studied for methyl orange (MO) degradation. The hybrid almost achieved 100% of MO degradation within 210 minutes and shows the highest photocatalytic activity. Furthermore, It was fixed to the Langmuir–Hinshelwood model and the degradation of MO dye by each sample obeys first-order reaction kinetics that it shows a good performance of photodegradation rate of dyes by heterogenous catalyst. This is due the 1D/2D heterostructures of TiO2NWs/RGO hybrid that has a large surface area, unique optical properties, flexible structure and excellent mobility of charge carriers.

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Facile assembly of CdS-reduced graphene oxide heterojunction with enhanced elimination performance for organic pollutants in wastewater

Cited by 40 publications

References 43 publications

Reduced Graphene Oxide/Few-Layer Phosphorene Binary Heterojunctions as Metal-Free Photocatalysts for the Sustainable Photoredox C–H Arylation of Heteroarenes

Reduced Graphene Oxide/Few-Layer Phosphorene Binary Heterojunctions as Metal-Free Photocatalysts for the Sustainable Photoredox C–H Arylation of Heteroarenes

Nanomaterials of Carbon and Metal Sulfides in Photocatalysis

A Study on Photocatalytic Efficiency of Hybrid Titanium Dioxide Nanowires/Reduced Graphene Oxide (TiO2NWs/RGO) for Degradation of Methyl Orange Dye

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