Recent progress of Ag/TiO2 photocatalyst for wastewater treatment: Doping, co-doping, and green materials functionalization

Kanakaraju, Devagi; Kutiang, Feniellia Diwvya anak; Lim, Ying Chin; Goh, Pei Sean

doi:10.1016/j.apmt.2022.101500

Cited by 46 publications

(17 citation statements)

References 284 publications

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“…Consequently, the recombination of the charge carriers can be minimized, which results in increased photocatalytic activity. Ag/TiO 2 was widely used as a photocatalyst for hydrogen evolution and wastewater treatment under full simulated solar spectrum irradiation. , The enhancement of the photocatalytic activity of the Ag/TiO 2 is also due to an increase in the surface area with the additional reactive sites for photo-reaction. , In addition, Ag prevents the recombination of charge carriers by separating the charge carriers and transferring the trapped electrons to the adsorbed H + and, thus, improves photocatalytic production of H 2 . − In C-modified Ag/TiO 2 , the presence of carbon acts as a sensitizer to provide additional activity by injecting electrons into the CB of TiO 2 . Photocatalytic activity studies of noble metal clusters including Pt, Au, Rh, and Pd on TiO 2 also showed enhancement in the rate of photocatalysis. , …”

Section: Tio2 With Noble Metal Co-catalystsmentioning

confidence: 99%

Mechanistic Understanding in Manipulating Energetics of TiO₂ for Photocatalysis

2023

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Titanium dioxide (TiO2) is a wide bandgap semiconductor that has a wide range of applications including wastewater treatment, photocatalysis, solar cells, and sensors owing to its excellent electronic and optical properties. However, the wide bandgap of TiO2 (∼3.2 eV) along with the recombination processes of the photoexcited charge carriers reduce its interfacial charge transport properties and respective activities. Energetics, optical response, and corresponding photophysics of excited charge carriers can be altered through doping and codoping of TiO2 and composite formulation. Therefore, it is very crucial to understand the structure–property and property-application relationships of doped, co-doped, and composite TiO2 to maximize the efficiency and extend the fundamental understanding for their applications in different fields. In this Perspective, we summarize the ongoing research on the advancement of undoped, doped, co-doped, and composite TiO2 including their structure and morphology, energetics, and corresponding photophysics relative to their applications in photocatalysis, wastewater treatment, and water-splitting reactions. We then propose our perspectives on the future potential of energetic manipulation of photocatalytic TiO2 to develop advanced and highly efficacious catalytic materials.

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Section: Tio2 With Noble Metal Co-catalystsmentioning

confidence: 99%

Mechanistic Understanding in Manipulating Energetics of TiO₂ for Photocatalysis

2023

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“…Therefore, it is necessary to comprehensively investigate the photodegradation applications of plasmonic-based heterojunction photocatalysts for the treatment of organic pollutants from wastewater. In recent years, many review papers on photocatalysts with plasmonic materials have been published that summarized the preparation approaches, and their applications in environmental remediation [ 45 – 47 ]. However, in these review papers, limited attention is paid to plasmonic effects in photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

A review on plasmonic-based heterojunction photocatalysts for degradation of organic pollutants in wastewater

et al. 2023

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Organic pollutants in wastewater are the biggest problem facing the world today due to population growth, rapid increase in industrialization, urbanization, and technological advancement. There have been numerous attempts to use conventional wastewater treatment techniques to address the issue of worldwide water contamination. However, conventional wastewater treatment has a number of shortcomings, including high operating costs, low efficiency, difficult preparation, fast recombination of charge carriers, generation of secondary waste, and limited light absorption. Therefore, plasmonic-based heterojunction photocatalysts have attracted much attention as a promising method to reduce organic pollutant problems in water due to their excellent efficiency, low operating cost, ease of fabrication, and environmental friendliness. In addition, plasmonic-based heterojunction photocatalysts contain a local surface plasmon resonance that enhances the performance of photocatalysts by improving light absorption and separation of photoexcited charge carriers. This review summarizes the major plasmonic effects in photocatalysts, including hot electron, local field effect, and photothermal effect, and explains the plasmonic-based heterojunction photocatalysts with five junction systems for the degradation of pollutants. Recent work on the development of plasmonic-based heterojunction photocatalysts for the degradation of various organic pollutants in wastewater is also discussed. Lastly, the conclusions and challenges are briefly described and the direction of future development of heterojunction photocatalysts with plasmonic materials is explored. This review could serve as a guide for the understanding, investigation, and construction of plasmonic-based heterojunction photocatalysts for various organic pollutants degradation. Graphical abstract Herein, the plasmonic effects in photocatalysts, such as hot electrons, local field effect, and photothermal effect, as well as the plasmonic-based heterojunction photocatalysts with five junction systems for the degradation of pollutants are explained. Recent work on plasmonic-based heterojunction photocatalysts for the degradation of various organic pollutants in wastewater such as dyes, pesticides, phenols, and antibiotics is discussed. Challenges and future developments are also described.

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“…Recent work has shown that Ag is an excellent dopant of TiO 2 photocatalyst due to its striking advantages when compared to other noble metals. Studies have concluded that Ag-doped TiO 2 successfully results in excellent charge transfer and the synergistic effect between SPR and metal oxides or heterojunctions enhances the resulting materials’ visible light responsiveness [ 11 ]. In another recent work, the addition of silver nanoparticles to zinc oxide made it possible to obtain a material with high photocatalytic properties.…”

Section: Introductionmentioning

confidence: 99%

Acid-Base and Photocatalytic Properties of the CeO2-Ag Nanocomposites

et al. 2023

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In this work, CeO2 nanoparticles, as well as CeO2 nanocomposites with plasmonic silver nanoparticles, were synthesized using a simple sol-gel process. The concentration of silver in the composites varied from 0.031–0.25 wt%. Cerium hydroxide dried gel was calcined at temperatures from 125 to 800 °C to obtain CeO2. It was shown that, at an annealing temperature of 650 °C, single-phase CeO2 nanopowders with an average particle size in the range of 10–20 nm can be obtained. The study of acid-base properties showed that with an increase in the calcination temperature from 500 to 650 °C, the concentration of active centers with pKa 9.4 and 6.4 sharply increases. An analysis of the acid-base properties of CeO2-Ag nanocomposites showed that with an increase in the silver concentration, the concentration of centers with pKa 4.1 decreases, and the number of active centers with pKa 7.4 increases. In a model experiment on dye photodegradation, it was shown that the resulting CeO2 and CeO2-Ag nanopowders have photocatalytic activity. CeO2-Ag nanocomposites, regardless of the silver concentration, demonstrated better photocatalytic activity than pure nanosized CeO2.

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Recent progress of Ag/TiO2 photocatalyst for wastewater treatment: Doping, co-doping, and green materials functionalization

Cited by 46 publications

References 284 publications

Mechanistic Understanding in Manipulating Energetics of TiO₂ for Photocatalysis

Mechanistic Understanding in Manipulating Energetics of TiO₂ for Photocatalysis

A review on plasmonic-based heterojunction photocatalysts for degradation of organic pollutants in wastewater

Acid-Base and Photocatalytic Properties of the CeO2-Ag Nanocomposites

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Recent progress of Ag/TiO2 photocatalyst for wastewater treatment: Doping, co-doping, and green materials functionalization

Cited by 46 publications

References 284 publications

Mechanistic Understanding in Manipulating Energetics of TiO2 for Photocatalysis

Mechanistic Understanding in Manipulating Energetics of TiO2 for Photocatalysis

A review on plasmonic-based heterojunction photocatalysts for degradation of organic pollutants in wastewater

Acid-Base and Photocatalytic Properties of the CeO2-Ag Nanocomposites

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Mechanistic Understanding in Manipulating Energetics of TiO₂ for Photocatalysis

Mechanistic Understanding in Manipulating Energetics of TiO₂ for Photocatalysis