Perspective on construction of heterojunction photocatalysts and the complete utilization of photogenerated charge carriers

Meng, Sugang; Zhang, Jinfeng; Chen, Shifu; Zhang, Sujuan; Huang, Weixin

doi:10.1016/j.apsusc.2019.01.246

Cited by 115 publications

(44 citation statements)

References 89 publications

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“…Therefore, the photogenerated electrons with high reduction ability in semiconductor-I and the photogenerated holes with high oxidation ability in semiconductor-B can be maintained [143]. In addition, the electrostatic attraction between the photogenerated electron on the CB of the semiconductor-II and the photogenerated holes on the VB of the semiconductor-I will promote the migration of the photogenerated electron from the semiconductor-II to the semiconductor-I, while in the type-II heterojunction, the electrostatic repulsion between the photogenerated electron of the semiconductor-I and the semiconductor-II will inhibit the transfer of electrons from semiconductor-I to the semiconductor-II [144,145]. So far, many photocatalytic composites that have the Z-scheme heterojunctions have been manufactured to degrade the pollutants.…”

Section: The Construction the Heterojunctionmentioning

confidence: 99%

Impact of Titanium Dioxide (TiO2) Modification on Its Application to Pollution Treatment—A Review

Zhou

2020

Catalysts

180

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A high-efficiency method to deal with pollutants must be found because environmental problems are becoming more serious. Photocatalytic oxidation technology as the environmentally-friendly treatment method can completely oxidate organic pollutants into pollution-free small-molecule inorganic substances without causing secondary pollution. As a widely used photocatalyst, titanium dioxide (TiO2) can greatly improve the degradation efficiency of pollutants, but several problems are noted in its practical application. TiO2 modified by different materials has received extensive attention in the field of photocatalysis because of its excellent physical and chemical properties compared with pure TiO2. In this review, we discuss the use of different materials for TiO2 modification, highlighting recent developments in the synthesis and application of TiO2 composites using different materials. Materials discussed in the article can be divided into nonmetallic and metallic. Mechanisms of how to improve catalytic performance of TiO2 after modification are discussed, and the future development of modified TiO2 is prospected.

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Section: The Construction the Heterojunctionmentioning

confidence: 99%

Impact of Titanium Dioxide (TiO2) Modification on Its Application to Pollution Treatment—A Review

Zhou

2020

Catalysts

180

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“…When n‐type semiconductor doped region and p‐type semiconductor doped region are in close contact, a p–n heterojunction region is formed at their space charge interface . When the photogenerated electrons and holes moved in the energy band of the p–n composite semiconductor photocatalysts, electron diffusion caused a spatial potential difference near the interface of the composite semiconductor, thus forming a self‐built electric field from the n‐type semiconductor to p‐type semiconductor direction .…”

Section: Photocatalysis Of Hydrotalcite‐derived Materials In Sewage Tmentioning

confidence: 99%

Research Progress in the Field of Adsorption and Catalytic Degradation of Sewage by Hydrotalcite‐Derived Materials

Pan

Tian

et al. 2019

The Chemical Record

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With the rapid development of industry and agriculture and the greatly improved living conditions, the resultant gradually deteriorated environments threaten the human beings. Refractory or even toxic pollutants, which are from different industries such as printing and dyeing, pesticides, chemicals, petrochemicals, plastics and rubber, seriously threat the ecosystems and human health. Having the advantages of flexible composition, unique structure, high stability, memory effect, easy preparation and low cost, hydrotalcite compounds have a great potential in sewage degradation and environmental protection. This study focuses on the adsorption and catalytic properties (such as photocatalysis, electrocatalysis and photoelectrocatalysis) of hydrotalcite-derived materials for treating organic, inorganic and heavy metal ion sewage. The types of adsorption and catalysis, and the effects of various influencing factors on the degradation efficiency were discussed as well.Wiley Online Library 355 Figure 13. The photoelectrocatalytic mechanism of organic pollutant MB over the ZNI-1-MMO-1.5 V photoelectrode.

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“…with other photocatalysts, which could be attributed to the high charge carrier recombination probability, so it is important to optimize the carrier dynamics [56,57]. One of the most effective methods is to construct the heterojunction with other traditional photocatalysts properly, which can not only further improve the solar light utilization efficiency, but also restrain the recombination rate of the photogenerated charge carrier [4,58,59]. Basically, two different heterojunctions were proved to be efficient for enhancing the photocatalytic activity: conventional type-II heterojunction and Z-scheme heterojunction, as illustrated in Fig.…”

Section: Tungsten-based Heterojunctionmentioning

confidence: 99%

“…Although the photogenerated charge carriers are separated efficiently under the driving of type-II heterojunction, the redox ability of electrons and holes is sacrificed due to the spontaneous transfer to low reduction and oxidation potentials for electrons and holes, respectively [61,63]. In contrast, Z-scheme heterojunction endows the tungsten-based composite with more positive VB and more negative CB potentials, which possess stronger oxidative holes and reductive electrons to carry out the enhanced photocatalytic performances [59,64,65].…”

Section: Tungsten-based Z-scheme Heterojunctionmentioning

confidence: 99%

Tungsten-based photocatalysts with UV–Vis–NIR photocatalytic capacity: progress and opportunity

Wang

Liu

et al. 2019

Tungsten

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Semiconductor photocatalysis is proven to be one of the potential approaches to solve energy crisis and environmental problems. Efficient solar energy utilization and superior charge carrier separation capacity are two crucial aspects in photocatalysis. Herein, the photocatalytic performances of the pristine and modified tungsten-based materials with mixed valence state are summarized concisely. The narrow band gap energy, coexistence of W 5+ /W 6+ and the oxygen vacancies all contribute to the pristine tungsten-based photocatalysts with unique ultraviolet (UV), visible (Vis), and near-infrared (NIR) light-induced photocatalytic activities. Furthermore, the enhanced localized surface plasmonic resonance (LSPR) effect, improved charge carrier separation efficiency and prolonged charge carrier lifetime all boost the performances of modified tungsten-based heterojunction photocatalysts. Moreover, multifunctional tungsten-based photocatalysts with mixed valence state are established to realize the full utilization of solar energy authentically. Concluding perspectives on the challenges and opportunities for the further exploration of tungsten-based photocatalysts are also presented.

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Perspective on construction of heterojunction photocatalysts and the complete utilization of photogenerated charge carriers

Cited by 115 publications

References 89 publications

Impact of Titanium Dioxide (TiO2) Modification on Its Application to Pollution Treatment—A Review

Impact of Titanium Dioxide (TiO2) Modification on Its Application to Pollution Treatment—A Review

Research Progress in the Field of Adsorption and Catalytic Degradation of Sewage by Hydrotalcite‐Derived Materials

Tungsten-based photocatalysts with UV–Vis–NIR photocatalytic capacity: progress and opportunity

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