A simple, one-pot, low temperature and pressure route for the synthesis of RGO/ZnO nanocomposite and investigating its photocatalytic activity

Baizaee, Seyyed Mahdy; Arabi, Mozhgan; Bahador, A.R.

doi:10.1016/j.mssp.2018.04.004

Cited by 34 publications

(13 citation statements)

References 60 publications

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“…These factors highlight the multilevel role of Gr in these composites: increase surface area by reducing average particle size during synthesis, increase adsorption through noncovalent interactions, and increase light absorption to harness more sunlight energy. The MB dye degradation process was further investigated by the reaction kinetics via the following first-order rate equation [28,40,41] À ln…”

Section: Photocatalytic Degradation Performance Of Gr/zno Compositesmentioning

confidence: 99%

Engineering of ZnO/Graphene Nanocomposite for Enhancing Visible Photocatalytic Ability

Sang

Anh

et al. 2022

Physica Status Solidi (a)

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Herein, the visible light‐photocatalytic performance of synthesized ZnO/Gr composite materials with different Gr content under various conditions, i.e., pH, dye concentration, and different scavengers (to understand the photocatalytic activity mechanism) is systematically investigated. Photocatalytic performance is evaluated with the degradation of methylene blue (MB) in solution under sunlight irradiation. The presence of graphene (Gr) in the ZnO/Gr composites shows enhanced photocatalytic activity compared to pure ZnO under natural sunlight illumination. The highest photodegradation efficiency of ≈94% when the content of Gr is 1 wt% in comparison to ≈76% for the pure ZnO, corresponding to reaction rate constants of 0.01038 and 0.00615 min−1, respectively. Compared to recent publications, the degradation efficiency is high with relatively high dye concentration, low catalyst amount, and large solution volume. The enhanced visible light absorption and the reduction of bandgap value are attributed to the enhanced photocatalytic properties of the hybridized composite. Moreover, the investigation of the effect of scavenger substances shows that H2O2 strongly enhanced their photocatalytic ability, suggesting that holes (h+) contribute as the reactive agent in the photodegradation process.

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Section: Photocatalytic Degradation Performance Of Gr/zno Compositesmentioning

confidence: 99%

Engineering of ZnO/Graphene Nanocomposite for Enhancing Visible Photocatalytic Ability

Sang

Anh

et al. 2022

Physica Status Solidi (a)

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“…Gần đây các nghiên cứu cho thấy tổ hợp dị thể của bán dẫn và kim loại, phi kim, hoặc tổ hợp với graphene cho hiệu suất vượt trội nhờ sự giảm tỷ lệ tái tổ hợp của các hạt mang điện nên là chìa khóa giúp cải thiện hoạt tính xúc tác quang [5][6][7]. Tiếp xúc dị thể từ việc kết hợp giữa các nguyên tố kim loại, phi kim hay oxit với chất bán dẫn xúc tác bán dẫn thuần có thể làm tăng thời gian sống của hạt dẫn, giúp cải thiện khả năng xử lý chất thải của chúng [8][9][10]. ZnO có năng lượng vùng cấm khá lớn (3,37 eV), tương ứng với vùng năng lượng ánh sáng cực tím mới cho hiệu quả quang xúc tác tốt nhất.…”

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<i>In-situ</i> hybridization of ZnO nanorod and graphene oxide with enhancing photocatalytic activity

Quang¹,

Xuan²

2021

Vietnam j. catal. adsorp.

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In this work, nanohybridization of ZnO nanorod and graphene oxide (GO) were prepared by a facile hydrothermal method. The effects of GO on crystal structure and surface morphology of ZnO were revealed by Scanning electron microscopy (SEM), Raman, and X-ray diffraction (XRD). The presence of GO in the composite resulted the ZnO nanorod more uniform which its diameter size was decreased. Optical properties characterized by UV-vis diffuse reflectance spectra (DRS) showed that the ZnO/GO composite has the narrower bandgap value and the better visible-light absorption characterisitics in compare to the bare ZnO. As a result, the photocatalytic ability in degradation of methylene blue under solar irradiation was enhanced in the ZnO/GO composite.

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“…Among these, ZnO exhibits a great affinity to adsorb both for CO2 and H2O [6,7,[30][31][32][33][34][35]. Moreover, several works point out ZnO efficiency as a photocatalyst and a strong candidate for AP performance [3,[7][8][9].…”

Section: Efficiency Featuresmentioning

confidence: 99%

“…There are studies of LEDs (Light-Emitting Diodes) of ZnO [36,42]. Moreover, as a photocatalyst for organic molecules degradation [44], as well as, it seems promising for organic molecule formation [3,[7][8][9]. It is worth mentioning that ZnO, actually ZnO-based compounds, e.g., Cu/ZnO/Al2O3, have been used as a heterogeneous catalyst since 1960 for the methanol production [35].…”

Section: Properties and Applicationsmentioning

confidence: 99%

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Anionic segregation of chloride and fluoride doped-nano ZnO: microstructure evolution, electrical conductivity and photocatalysis.

Fortes¹

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Primeiramente, gostaria de agradecer a minha família, pelos exemplos e ensinamentos, proporcionando o suporte essencial para eu concluir esta tese. Em especial agradeço a minha mãe pelo seu exemplo de força, dedicação e conquista, ao meu falecido pai que me ensinou a amar a vida e os seus valores, aos meus irmãos, Laura e Francisco, pelo apoio. Também à minha namorada Joseleine pela compreensão e incentivo. E agradeço a Deus pela minha vida. Agradeço a orientação do Prof. Dr. Douglas Gouvêa, pelos ensinamentos de nano-óxidos e pela possibilidade do estágio do doutorado sanduíche. Agradeço ao Dr. Fábio Coral Fonseca pelas medidas de impedância no IPEN e pelos ensinamentos com o tratamento dos resultados destas medidas. Agradeço ao Prof. Dr. Ricardo H. R. Castro pela possibilidade do doutorado sanduíche e toda a atenção e suporte durante a estadia na UCD, em Davis, Califórnia (EUA). Agradeço ao Prof. Dr. Roland Faller pelos ensinamentos em Molecular Dynamics, e a paciência com o meu aprendizado desde o início. E também aos colegas de trabalho pelo convívio no laboratório e aprendizado em conjunto:

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A simple, one-pot, low temperature and pressure route for the synthesis of RGO/ZnO nanocomposite and investigating its photocatalytic activity

Cited by 34 publications

References 60 publications

Engineering of ZnO/Graphene Nanocomposite for Enhancing Visible Photocatalytic Ability

Engineering of ZnO/Graphene Nanocomposite for Enhancing Visible Photocatalytic Ability

<i>In-situ</i> hybridization of ZnO nanorod and graphene oxide with enhancing photocatalytic activity

Anionic segregation of chloride and fluoride doped-nano ZnO: microstructure evolution, electrical conductivity and photocatalysis.

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