Design and synthesis of porous Ag/ZnO nanosheets assemblies as super photocatalysts for enhanced visible-light degradation of 4-nitrophenol and hydrogen evolution

Mou, Hongyu; Song, Caixia; Zhou, Yanhong; Zhang, Bo; Wang, Debao

doi:10.1016/j.apcatb.2017.09.061

Cited by 218 publications

(75 citation statements)

References 47 publications

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“…In Figure 4b, the Zn 2p spectra has two symmetrical peaks at 1021.4 and 1044.6 eV, corresponding to Zn 2p3/2 and Zn 2p1/2, respectively. This is indicative of the presence of Zn 2+ in the samples, according to the reported data [30,31]. In Figure 4c, both samples present similar O1s spectra, which can be fitted into two peaks (531.7 eV and 530.2 eV), corresponding to the surface adsorbed oxygen and the lattice oxygen of ZnO [32], respectively.…”

Section: Introductionsupporting

confidence: 79%

Enhanced Photocatalytic Ozonation of Phenol by Ag/ZnO Nanocomposites

Peng

Ming

et al. 2019

Catalysts

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Ag/ZnO nanocomposites were synthesized and applied in the photocatalytic ozonation of phenol. Their crystal, textural, morphological, optical, and electrochemical properties were investigated by XRD, Raman, SEM, TEM, UV-Vis diffuse reflectance spectroscopy (DRS), X-ray photoemission spectroscopy (XPS), and photoluminescence (PL) techniques in detail. The results indicated that silver nanoparticles were well dispersed on the surface of porous ZnO and the intimate contacts were formed at the Ag/ZnO interfaces. This prominently favored the separation and transfer of photoinduced electrons from ZnO to Ag nanoparticles for the activation of ozone to produce •OH and •O 2 − . As a result, a significant enhancement in photocatalytic ozonation of phenol was achieved over Ag/ZnO catalysts. It also showed a synergistic effect between photocatalysis and ozonation.Catalysts 2019, 9, 1006 2 of 12 pairs [20][21][22][23]. In addition, the supported metal nanoparticles can work with the semiconductor to cocatalyze chemical reactions [24][25][26]. In this study, Ag nanoparticles were employed to decorate ZnO for photocatalytic ozonation of organic pollutants by means of their unique properties. Experimentally, Ag nanoparticles were deposited onto the ZnO surface via a photochemical approach and the resultant Ag/ZnO catalysts were well investigated by XRD, Brunauer-Emmett-Teller (BET), TEM, SEM, X-ray photoemission spectroscopy (XPS), and electrochemical measurement. Phenol was chosen as a model contaminant to assess the catalytic performance. Electron paramagnetic resonance (EPR), along with quenching experiments, was conducted to probe the role of active species in the phenol removal and mineralization. Furthermore, the possible reaction mechanism over Ag/ZnO nanocomposites was proposed. Results and Discussion Catalysts Characterization

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Section: Introductionsupporting

confidence: 79%

Enhanced Photocatalytic Ozonation of Phenol by Ag/ZnO Nanocomposites

Peng

Ming

et al. 2019

Catalysts

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“…Upon solar irradiation that includes some UV light, plasmonic metals loaded on semiconductors can simultaneously play several roles as visible light harvester due to the plasmonic resonance, as promoters of efficient charge separation due to Schottky junction and as cocatalysts promoting charge transfer to substrates. For example, Ag NPs were loaded on ZnO hierarchical microspheres composed of PSC nanosheets by liquid‐phase precipitation,122 and on rutile TiO 2 PSC nanorods by photoreduction,123 observing in both cases on obvious enhancement of the photocatalytic ability. It could happen that one of the roles prevails over the others.…”

Section: Basic Features Of Pscsmentioning

confidence: 99%

Porous Single‐Crystal‐Based Inorganic Semiconductor Photocatalysts for Energy Production and Environmental Remediation: Preparation, Modification, and Applications

Niu

Albero

Atienzar

et al. 2020

Adv Funct Materials

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Semiconductor photocatalytic and photovoltaic performance depends on crystallinity and surface area to a large extent. One strategy that has recently emergyed to improve semiconductor photoresponse efficiency is their synthesis as porous single crystals (PSCs), therefore providing simultaneously high crystallinity, minimization of grain boundaries, and large specific surface area. Other factors, such as high density of active sites, and enhanced light absorption, also contribute to increased PSC photoresponse with respect to analogous bulk or amorphous materials. This review initially presents the concept and main properties of PSCs. Then, the synthetic routes and the applications as photocatalysts and as photovoltaic devices, mainly in sunlight applications, are summarized. The synthetic procedures have been classified according to the mechanism of pore generation. Applications cover photocatalysis for environmental remediation, solar fuels production, selective photooxidation of organic compounds, and photovoltaic devices. Finally, a summary and views on future developments are provided. The purpose of this review is to show how the use of PSCs is a powerful general methodology applicable beyond metal oxides and can ultimately lead to sufficient photoresponse efficiency, bringing these processes close to commercial application.

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“…Many semiconductors, such as TiO 2 and ZnO, mainly absorb UV light, which indicates that they use only about 4% of the solar spectrum. 6,7 To increase the visible-light response activity of semiconductors, many strategies have been reported, including doping, 8 coupling with other photocatalyst, 9 structure engineering, 10 and so on. Among all these strategies, a heterostructure is one way to simultaneously obtain both efficient charge separation and photo-electrochemical stability.…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocarriers separation of novel CdS/pt/Mo₂C heterostructure for visible-light-driven hydrogen evolution

et al. 2018

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Design and synthesis of porous Ag/ZnO nanosheets assemblies as super photocatalysts for enhanced visible-light degradation of 4-nitrophenol and hydrogen evolution

Cited by 218 publications

References 47 publications

Enhanced Photocatalytic Ozonation of Phenol by Ag/ZnO Nanocomposites

Enhanced Photocatalytic Ozonation of Phenol by Ag/ZnO Nanocomposites

Porous Single‐Crystal‐Based Inorganic Semiconductor Photocatalysts for Energy Production and Environmental Remediation: Preparation, Modification, and Applications

Enhanced photocarriers separation of novel CdS/pt/Mo₂C heterostructure for visible-light-driven hydrogen evolution

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Design and synthesis of porous Ag/ZnO nanosheets assemblies as super photocatalysts for enhanced visible-light degradation of 4-nitrophenol and hydrogen evolution

Cited by 218 publications

References 47 publications

Enhanced Photocatalytic Ozonation of Phenol by Ag/ZnO Nanocomposites

Enhanced Photocatalytic Ozonation of Phenol by Ag/ZnO Nanocomposites

Porous Single‐Crystal‐Based Inorganic Semiconductor Photocatalysts for Energy Production and Environmental Remediation: Preparation, Modification, and Applications

Enhanced photocarriers separation of novel CdS/pt/Mo2C heterostructure for visible-light-driven hydrogen evolution

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Enhanced photocarriers separation of novel CdS/pt/Mo₂C heterostructure for visible-light-driven hydrogen evolution