Enhanced photocatalytic activities of ZnO dumbbell/reduced graphene oxide nanocomposites for degradation of organic pollutants via efficient charge separation pathway

Prabhu, Shivananda; Megala, S.; Harish, S.; Navaneethan, M.; Maadeswaran, P.; Sohila, S.; Ramesh, R.

doi:10.1016/j.apsusc.2019.05.086

Cited by 90 publications

(11 citation statements)

References 43 publications

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“…The photocurrent response intensities of the samples are attenuated in the following order: CCNC‐0.1 > CoS > CeO 2 . Apparently, CCNC‐0.1 displays much stronger photocurrent response than those of CoS and CeO 2 , implying that the photogenerated charges are transferred faster and the recombination of photoinduced electrons and holes is effectively suppresse 58 . Simultaneously, this argument also is supported by the results of electrochemical impedance spectroscopy (EIS).…”

Section: Resultsmentioning

confidence: 73%

Construction of CoS/CeO₂ heterostructure nanocages with enhanced photocatalytic performance under visible light

Meng

Zhou

et al. 2020

J Am Ceram Soc

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Exploring non‐noble metal photocatalysts with high activity and stability is always fascinating. Herein, the hollow CoS nanocages deriven from ZIF‐67 have been reported for the first time to combine with CeO2 NPs grown in situ for photocatalytic degradation of stubborn pollutants. The unique CoS nanocages not only provide rich active sites but also enhance light capture. CeO2 NPs loaded on the surface accelerate the separation of photocharges and extend the lifetime of photogenerated carriers. The optimized photocatalysts show outstanding activity and stability for the photodegradation of tetracycline and phenol under visible light, and the corresponding photodegradation efficiency is 96.5% and 90.5% at 60 minutes. The novel multi‐stage nanocage structure simultaneously realizes extended light absorption and improved photocharges transfer efficiency. This work provides an exclusive perspective to design high‐efficiency photocatalysts with hollow structures for environmental restoration.

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Section: Resultsmentioning

confidence: 73%

Construction of CoS/CeO₂ heterostructure nanocages with enhanced photocatalytic performance under visible light

Meng

Zhou

et al. 2020

J Am Ceram Soc

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“…A great diversity of ZnO shapes has been reported in ZnO-graphene nanocomposites, as seen in Figure 15. The main ZnO morphologies are spheres (solid and hollow) [101], rods [102], flowers [103], core-shell [104], flakes [104], oval [105], wires [105], grains [106], cubes [107], quantum dots [108], trapezoids [109], tetrapods [110], and dumbbell [111]. The main problem in synthesizing this type of nanocomposites is the almost null control over ZnO's morphology.…”

Section: Morphologies and Sizes Of Znomentioning

confidence: 99%

Synthesis, Characterization, and Photocatalytic Performance of ZnO–Graphene Nanocomposites: A Review

et al. 2020

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ZnO is an exciting material for photocatalysis applications due to its high activity, easy accessibility of raw materials, low production costs, and nontoxic. Several ZnO nano and microstructures can be obtained, such as nanoparticles, nanorods, micro flowers, microspheres, among others, depending on the preparation method and conditions. ZnO is a wide bandgap semiconductor presenting massive recombination of the generated charge carriers, limiting its photocatalytic efficiency and stability. It is common to mix it with metal, metal oxide, sulfides, polymers, and nanocarbon-based materials to improve its photocatalytic behavior. Therefore, ZnO–nanocarbon composites formation has been a viable alternative that leads to new, more active, and stable photocatalytic systems. Mainly, graphene is a well-known two-dimensional material, which could be an excellent candidate to hybridize with ZnO due to its excellent physical and chemical properties (e.g., high specific surface area, optical transmittance, and thermal conductivity, among others). This review analyses ZnO–graphene nanocomposites’ recent advances, addressing the synthesis methods and the resulting structural, morphological, optical, and electronic properties. Moreover, we examine the ZnO–graphene composites’ role in the photocatalytic degradation of organic/inorganic pollutants.

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“…On the nanoscale, ZnO shows exceptional physicochemical properties that are beneficial in many industrial applications. Many researchers have successfully used ZnO nanostructures in photocatalytic [13][14][15][16], photovoltaic [17][18][19][20], biomedical [21][22][23][24] and sensing [25][26][27][28][29][30][31] applications, as it provides large surface area as compared to its bulk counterpart. The demand of highly efficient, durable and robust photocatalysts for wastewater treatment makes ZnO nanostructures a reliable candidate for photocatalytic applications.…”

Section: Introductionmentioning

confidence: 99%

One-Pot Sonochemical Synthesis of ZnO Nanoparticles for Photocatalytic Applications, Modelling and Optimization

et al. 2019

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This present study proposed a successful one pot synthesis of zinc oxide nanoparticles (ZnO NPs) and their optimisation for photocatalytic applications. Zinc chloride (ZnCl2) and sodium hydroxide (NaOH) were selected as chemical reagents for the proposed study. The design of this experiment was based on the reagents’ amounts and the ultrasonic irradiations’ time. The results regarding scanning electron microscopy (SEM), X-ray diffraction (XRD) and Raman spectroscopy confirmed the presence of ZnO NPs with pure hexagonal wurtzite crystalline structure in all synthesised samples. Photocatalytic activity of the developed samples was evaluated against methylene blue dye solution. The rapid removal of methylene blue dye indicated the higher photocatalytic activity of the developed samples than untreated samples. Moreover, central composite design was utilised for statistical analysis regarding the obtained results. A mathematical model for the optimisation of input conditions was designed to predict the results at any given point. The role of crystallisation on the photocatalytic performance of developed samples was discussed in detail in this novel study.

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Enhanced photocatalytic activities of ZnO dumbbell/reduced graphene oxide nanocomposites for degradation of organic pollutants via efficient charge separation pathway

Cited by 90 publications

References 43 publications

Construction of CoS/CeO₂ heterostructure nanocages with enhanced photocatalytic performance under visible light

Construction of CoS/CeO₂ heterostructure nanocages with enhanced photocatalytic performance under visible light

Synthesis, Characterization, and Photocatalytic Performance of ZnO–Graphene Nanocomposites: A Review

One-Pot Sonochemical Synthesis of ZnO Nanoparticles for Photocatalytic Applications, Modelling and Optimization

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Enhanced photocatalytic activities of ZnO dumbbell/reduced graphene oxide nanocomposites for degradation of organic pollutants via efficient charge separation pathway

Cited by 90 publications

References 43 publications

Construction of CoS/CeO2 heterostructure nanocages with enhanced photocatalytic performance under visible light

Construction of CoS/CeO2 heterostructure nanocages with enhanced photocatalytic performance under visible light

Synthesis, Characterization, and Photocatalytic Performance of ZnO–Graphene Nanocomposites: A Review

One-Pot Sonochemical Synthesis of ZnO Nanoparticles for Photocatalytic Applications, Modelling and Optimization

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Construction of CoS/CeO₂ heterostructure nanocages with enhanced photocatalytic performance under visible light

Construction of CoS/CeO₂ heterostructure nanocages with enhanced photocatalytic performance under visible light