Reduced graphene oxide wrapped CdS composites with enhanced photocatalytic performance and high stability

Zou, Lei; Wang, Xiong; Xu, Xiaoyun; Wang, Haoran

doi:10.1016/j.ceramint.2015.08.119

Cited by 42 publications

(21 citation statements)

References 37 publications

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“…As reported before, nanoscaled iron-based compounds can catalyze the activation of H 2 O 2 to produce Á OH radicals through Fenton-like reaction, leading to the enhanced degradation of organic contaminants [37][38][39]. The main Fenton-like process could be depicted as below:…”

Section: Resultsmentioning

confidence: 96%

Self-propagating combustion synthesis and synergistic photocatalytic activity of GdFeO3 nanoparticles

Wang

2016

J Sol-Gel Sci Technol

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GdFeO 3 (GFO) nanoparticles were synthesized by a glycine-assisted self-propagating combustion process. The as-synthesized GdFeO 3 was characterized by X-ray diffraction, transmission electron microscopy, and UV-Vis diffuse reflectance spectra. The visible-light-responsive photocatalytic activity of GdFeO 3 nanoparticles was evaluated by the photodegradation of Rhodamine B under visible light. The results indicate that the as-prepared GdFeO 3 nanoparticles exhibit remarkable visible-light photocatalytic activity through the synergism of semiconductor-photocatalyzed oxidation and heterogeneous Fenton-like reaction. Compared with the bulk GFO, the photodecomposition rate of RhB was improved about 22 times when the simultaneous presence of the nanoparticles and H 2 O 2 was observed. The mechanism and the main active species involved in photocatalytic oxidative reaction were also investigated through the carriers trapping experiments. Graphical AbstractNHE -1 0 1 2 3

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Section: Resultsmentioning

confidence: 96%

Self-propagating combustion synthesis and synergistic photocatalytic activity of GdFeO3 nanoparticles

Wang

2016

J Sol-Gel Sci Technol

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“…In Figure A, the sharp (002) peak of GO, located at 2 θ = 11.8 o , indicates a well‐ordered, lamellar GO structure, which corresponds to the large an interlayer distance in GO due to the presence of intercalated H 2 O molecules and various oxygen‐containing functional groups . Figure B depicts the characteristic X‐ray diffraction of microstructured CdS (commercial), where the observed diffraction peaks are according to the crystallographic planes of the hexagonal structure of CdS (ICDD PDF 80‐0006) with the crystal lattice parameters of 4.12, 4.12, and 6.68 A° . The XRD peaks of CdS (Figure C) after laser ablation are quite broad indicating that crystallite size of the as‐prepared CdS NPs is relatively small compared with that of the microstructured CdS.…”

Section: Resultsmentioning

confidence: 99%

“…However, when GO was added during the pulsed ablation process, the morphology of the CdS NPs became quite different, which is evident from the TEM image of CdS/rGO in Figure B, where it is quite clear that CdS NPs were wrapped up closely with rGO sheets. When CdS/rGO nanocomposite is formed because of laser irradiation, the interfacial interactions were reinforced, which paved a way for easy mobility of photoinduced electrons from CdS NPs to rGO, thereby increasing the transfer efficiency of the photoinduced charge carriers …”

Section: Resultsmentioning

confidence: 99%

“…29,30 Figure 2B depicts the characteristic X-ray diffraction of microstructured CdS (commercial), where the observed diffraction peaks are according to the crystallographic planes of the hexagonal structure of CdS (ICDD PDF 80-0006) with the crystal lattice parameters of 4.12, 4.12, and 6.68 A°. 19,31,32 The XRD peaks of CdS ( Figure 2C) after laser ablation are quite broad indicating that crystallite size of the asprepared CdS NPs is relatively small compared with that of the microstructured CdS. Figure 2D is the XRD pattern of CdS/rGO, where we can notice that the characteristic XRD pattern of CdS NPs is also retained to a great extent.…”

Section: Photocatalytic Studiesmentioning

confidence: 95%

“…Murillo et al investigated the influence of graphene oxide reduction on the structure and photo‐activity of CdS/rGO hybrid system fabricated through solvothermal method. Lei et al developed a mixing process using ethylene glycol as solvent to prepare CdS/rGO nanocomposite. Nannan et al used reflux condensation method to synthesize CdS/rGO nanocomposite for photocatalytic applications.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of cadmium sulfide-reduced graphene oxide nanocomposites by pulsed laser ablation in liquid for the enhanced photocatalytic reactions in the visible light

et al. 2018

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Summary The large‐scale applications of cadmium sulfide (CdS) nanoparticles (NPs) as a photo‐catalyst are limited by their poor stability (high aggregation tendency) and consequent reduction in the surface area and increased rate of recombination of photoinduced electron‐hole pairs, despite its inherent positive feature of being visible light active. It has been reported that the photocatalytic performance of CdS can be considerably improved if CdS is made as a composite material with reduced graphene oxide (rGO) in an optimum ratio. In this work, for the first time, we adopted the technique of pulsed laser ablation in liquids (PLAL) to synthesize highly pure CdS NPs and the required CdS/rGO nanocomposites using high purity (99.9%) microstructured CdS and graphene oxide as chemical precursors. PLAL is a simple and rapid 1‐step synthesis process (where the reaction time is reduced from several hours to a few minutes), which does not require high temperature, toxic chemicals, and the final treatment to remove the unwanted by‐products. The optical and morphological characterizations revealed that the anchoring of CdS on rGO transformed the CdS/rGO composite into an efficient photo‐catalyst by enhancing the following positive attributes required for a good photo‐catalyst: (1) The inherent tendency of aggregation of CdS is considerably reduced; CdS NPs with an average grain size of 20 nm are well placed on the rGO sheets; and hence, the surface area of the catalyst was significantly increased to provide more active sites. (2) The reduced rate of photoinduced electron‐hole recombination manifested in the photoluminescence spectrum indicated the effective charge separation. (3) The enhanced light absorption in the visible/infrared region ensured the effectiveness of this material in naturally abundant solar radiation. In the CdS/rGO composite, the rGO sheets play the role of a supporting matrix, cocatalyst, and electron acceptor for CdS. To evaluate the photo‐catalytic performance of CdS/rGO, we applied it as a visible light‐driven photo‐catalyst for degrading methylene blue dye and found that CdS/rGO nanocomposite was more efficient than pure CdS in the visible spectral region. Therefore, PLAL provides a simple and 1‐step route to synthesize high‐purity visible light–driven photo‐catalysts and solar cell material.

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Reduced Graphene Oxide‐Cadmium Sulfide Nanorods Decorated with Silver Nanoparticles for Efficient Photocatalytic Reduction Carbon Dioxide Under Visible Light

et al. 2018

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Photocatalytic CO2 reduction is an attractive approach for the direct conversion of solar energy into chemical fuels. In this study, we synthesized a composite material that consists of Ag, reduced graphene oxide (RGO), and CdS nanorods as a photocatalyst for CO2 reduction. The morphological, structural, optical, and electrochemical properties of the resultant nanocomposite (Ag‐RGO‐CdS) were investigated by using various physical techniques (e.g., XRD, SEM, TEM, X‐ray photoelectron spectroscopy, UV/Vis diffuse reflectance spectroscopy, and electrochemical impedance spectroscopy). Our results indicate that the Ag‐RGO‐CdS nanocomposites exhibit an enhanced photocatalytic activity for the conversion of CO2 into CO, and the optimum activity is achieved over 1.0 wt %Ag‐3.0 wt %RGO‐CdS. This enhanced performance can be ascribed to the multifunctional promoting effects of RGO and Ag in the composite. On one hand, RGO and Ag can act as electron acceptors, which enhances the separation efficiency of photogenerated carriers. On the other hand, the incorporation of RGO and Ag can improve the adsorption and activation of CO2, which results in the enhancement of the photocatalytic reduction of CO2 to CO. Furthermore, a possible mechanism for photocatalytic CO2 reduction over the Ag‐RGO‐CdS nanocomposites was proposed. This study demonstrates a semiconductor‐based hybrid for efficient photocatalytic CO2 reduction by virtue of the combinational effect of dual cocatalysts.

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Reduced graphene oxide wrapped CdS composites with enhanced photocatalytic performance and high stability

Cited by 42 publications

References 37 publications

Self-propagating combustion synthesis and synergistic photocatalytic activity of GdFeO3 nanoparticles

Self-propagating combustion synthesis and synergistic photocatalytic activity of GdFeO3 nanoparticles

Synthesis of cadmium sulfide-reduced graphene oxide nanocomposites by pulsed laser ablation in liquid for the enhanced photocatalytic reactions in the visible light

Reduced Graphene Oxide‐Cadmium Sulfide Nanorods Decorated with Silver Nanoparticles for Efficient Photocatalytic Reduction Carbon Dioxide Under Visible Light

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