Synthesis of CsPbBr3/CsPb2Br5@silica yolk-shell composite microspheres: precisely controllable structure and improved catalytic activity for dye degradation

Xie, Kehan; Wei, Shijing; Alhadhrami, A.; Liu, Jie; Zhang, Putao; Elnaggar, Ashraf Y.; Zhang, Feng; Mahmoud, M. H. H.; Murugadoss, Vignesh; El‐Bahy, Salah M.; Wang, Feijiu; Li, Chao; Li, Guoqiang

doi:10.1007/s42114-022-00520-4

Cited by 62 publications

(27 citation statements)

References 44 publications

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“…As a result, only a small number of the photocarriers can migrate to the surface of the photocatalyst to participate in the degradation reactions. The photogenerated carriers must be spatially separated with high efficiency to achieve high photocatalytic activity that meets the requirements of industrial application in water purification. − …”

Section: Introductionmentioning

confidence: 99%

Construction of Z-Scheme Ag₂MoO₄/ZnWO₄ Heterojunctions for Photocatalytically Removing Pollutants

Zhang¹,

Ma²,

Sun³

et al. 2023

Langmuir

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Facilitation of the photocarrier separation is a crucial strategy for developing highly efficient photocatalysts in eliminating environmental pollutants. Herein we have developed a new kind of Ag 2 MoO 4 /ZnWO 4 (AMO/ZWO) composite photocatalysts with a Z-scheme mechanism by anchoring AMO nanoparticles onto ZWO nanorods. Multiple characterization methodologies and density functional theory (DFT) calculations were employed to study the performances of the AMO/ZWO heterojunctions as well as the underlying photocatalytic mechanism. Simulated-sunlight-driven photodegradation experiments for removing methylene blue (MB) demonstrates that the 8%AMO/ZWO heterojunction can photocatalytically remove 99.8% of MB within 60 min, and the reaction rate constant is obtained as 0.10199 min −1 , which is enhanced by 6.8 (or 4.9) times when compared with that of pure ZWO (or AMO). On the base of the experimental results and DFT calculations, the enhanced photocatalytic mechanism of the AMO/ZWO heterojunctions was revealed to be the efficient separation of photocarriers via a Z-scheme transfer process. In addition, photodegradion of various organic pollutants over 8%AMO/ZWO was further compared and aimed at incorporating it into industrial application in pollutant removal.

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Section: Introductionmentioning

confidence: 99%

Construction of Z-Scheme Ag₂MoO₄/ZnWO₄ Heterojunctions for Photocatalytically Removing Pollutants

Zhang¹,

Ma²,

Sun³

et al. 2023

Langmuir

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“…Second, hollow or mesoporous materials (generally at submicrometer scale) are used to package CsPbX 3 nanocrystals. For example, Xie et al preprepared hollow SiO 2 spheres as protective shells and then grew CsPbBr 3 /CsPb 2 Br 5 composites on their interior . Tong et al encapsulated CsPbBr 3 nanocrystals in the pores of zeolite resulting in CsPbX 3 @zeolite with high quantum yields and showing excellent thermal/optical stability .…”

Section: Introductionmentioning

confidence: 99%

Ultrastable CsPbBr₃@CsPb₂Br₅@TiO₂ Composites for Photocatalytic and White Light-Emitting Diodes

Zhang

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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Although cesium halide lead (CsPbX3, X = Cl, Br, I) perovskite quantum dots (QDs) have excellent photovoltaic properties, their unstable characteristics are major limitations to application. Previous research has demonstrated that the core–shell structure can significantly improve the stability of CsPbX3 QDs and form heterojunctions at interfaces, enabling multifunctionalization of perovskite materials. In this article, we propose a convenient method to construct core–shell-structured perovskite materials, in which CsPbBr3@CsPb2Br5 core–shell micrometer crystals can be prepared by controlling the ratio of Cs+/Pb2+ in the precursor and the reaction time. The materials exhibited enhanced optical properties and stability that provided for further postprocessing. Subsequently, CsPbBr3@CsPb2Br5@TiO2 composites were obtained by coating a layer of dense TiO2 nanoparticles on the surfaces of micrometer crystals through hydrolysis of titanium precursors. According to density functional theory (DFT) calculations and experimental results, the presence of surface TiO2 promoted delocalization of photogenerated electrons and holes, enabling the CsPbBr3@CsPb2Br5@TiO2 composites to exhibit excellent performance in the field of photocatalysis. In addition, due to passivation of surface defects by CsPb2Br5 and TiO2 shells, the luminous intensity of white light-emitting diodes prepared with the materials only decayed by 2%–3% at high temperatures (>100 °C) when working for 24 h.

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“…The structural unit is formed by two silica-oxygen tetrahedral lamellae sandwiched between aluminum-oxygen octahedral lamellae, and the tetrahedral and octahedral lamellae are connected by oxygen atoms; 31 as a carrier for nanomaterials, it has a large specific surface area (240 m 2 g −1 ), allowing LDH and MnO 2 to be dispersed well and constructed into nanoflower-like functional materials, which helps to improve the material's EW absorption properties. At present, LDH@MMT is widely applied in adsorption, catalysis, electrochemistry, 32 and environmental 33 and energy fields. 34 In this work, a two-dimensional multilayer core-shell nanoflower-like structure of a clay mineral-based composite was constructed by a two-step hydrothermal method to obtain MNFM from cationic clay (MMT), anionic clay (LDH), and δ-MnO 2 .…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of a 2D multilayer core–shell MnO₂@LDH@MMT composite with a nanoflower shape for electromagnetic wave absorption

Zhou

Dai

et al. 2022

CrystEngComm

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Synthesis of CsPbBr3/CsPb2Br5@silica yolk-shell composite microspheres: precisely controllable structure and improved catalytic activity for dye degradation

Cited by 62 publications

References 44 publications

Construction of Z-Scheme Ag₂MoO₄/ZnWO₄ Heterojunctions for Photocatalytically Removing Pollutants

Construction of Z-Scheme Ag₂MoO₄/ZnWO₄ Heterojunctions for Photocatalytically Removing Pollutants

Ultrastable CsPbBr₃@CsPb₂Br₅@TiO₂ Composites for Photocatalytic and White Light-Emitting Diodes

Facile synthesis of a 2D multilayer core–shell MnO₂@LDH@MMT composite with a nanoflower shape for electromagnetic wave absorption

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Synthesis of CsPbBr3/CsPb2Br5@silica yolk-shell composite microspheres: precisely controllable structure and improved catalytic activity for dye degradation

Cited by 62 publications

References 44 publications

Construction of Z-Scheme Ag2MoO4/ZnWO4 Heterojunctions for Photocatalytically Removing Pollutants

Construction of Z-Scheme Ag2MoO4/ZnWO4 Heterojunctions for Photocatalytically Removing Pollutants

Ultrastable CsPbBr3@CsPb2Br5@TiO2 Composites for Photocatalytic and White Light-Emitting Diodes

Facile synthesis of a 2D multilayer core–shell MnO2@LDH@MMT composite with a nanoflower shape for electromagnetic wave absorption

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Construction of Z-Scheme Ag₂MoO₄/ZnWO₄ Heterojunctions for Photocatalytically Removing Pollutants

Construction of Z-Scheme Ag₂MoO₄/ZnWO₄ Heterojunctions for Photocatalytically Removing Pollutants

Ultrastable CsPbBr₃@CsPb₂Br₅@TiO₂ Composites for Photocatalytic and White Light-Emitting Diodes

Facile synthesis of a 2D multilayer core–shell MnO₂@LDH@MMT composite with a nanoflower shape for electromagnetic wave absorption