Titanium oxide based photocatalytic materials development and their role of in the air pollutants degradation: Overview and forecast

Tsang, Adley; Li, Kai; Zeng, Yuxuan; Zhao, Wei; Zhang, Tao; Zhan, Yanhui; Xie, Ruijie; Leung, Dennis Y.C.; Huang, Haibao

doi:10.1016/j.envint.2019.01.015

Cited by 246 publications

(93 citation statements)

References 236 publications

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“…These charge carriers can migrate to the surface of the photo-catalysts and transform chemical molecules in the context of chemical reactions concerning elimination of pollutants, generation of fuels or added value chemicals, microorganism inactivation, and others. All these chemical (and biological) processes compete with the recombination of charge, and the balance between these two types of processes controls the fate of charge carrier species and primarily determine photo-activity [ 1 , 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

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Sunlight-Operated TiO2-Based Photocatalysts

et al. 2020

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Photo-catalysis is a research field with broad applications in terms of potential technological applications related to energy production and managing, environmental protection, and chemical synthesis fields. A global goal, common to all of these fields, is to generate photo-catalytic materials able to use a renewable energy source such as the sun. As most active photocatalysts such as titanium oxides are essentially UV absorbers, they need to be upgraded in order to achieve the fruitful use of the whole solar spectrum, from UV to infrared wavelengths. A lot of different strategies have been pursued to reach this goal. Here, we selected representative examples of the most successful ones. We mainly highlighted doping and composite systems as those with higher potential in this quest. For each of these two approaches, we highlight the different possibilities explored in the literature. For doping of the main photocatalysts, we consider the use of metal and non-metals oriented to modify the band gap energy as well as to create specific localized electronic states. We also described selected cases of using up-conversion doping cations. For composite systems, we described the use of binary and ternary systems. In addition to a main photo-catalyst, these systems contain low band gap, up-conversion or plasmonic semiconductors, plasmonic and non-plasmonic metals and polymers.

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Section: Introductionmentioning

confidence: 99%

“…This short discussion points out that titania can be the base of most active materials. In fact, a survey of literature summarized in review articles indicates that this is the general case in photocatalysis [ 1 , 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

Sunlight-Operated TiO2-Based Photocatalysts

et al. 2020

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“…A huge number of various reports on titania photocatalysts have been published annually ( Figure 1a) for different applications, including several insightful review papers, e.g., Hashimoto et al [3], Zaleska [4], Kowalski et al [5], and Tsang et al [6]. Despite these papers, there is still a lack of comprehensive review focusing on the influence of the morphology and the structure on the photocatalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Morphology- and Crystalline Composition-Governed Activity of Titania-Based Photocatalysts: Overview and Perspective

et al. 2019

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Titania photocatalysts have been intensively examined for both mechanism study and possible commercial applications for more than 30 years. Although various reports have already been published on titania, including comprehensive review papers, the morphology-governed activity, especially for novel nanostructures, has not been reviewed recently. Therefore, this paper presents novel, attractive, and prospective titania photocatalysts, including zero-, one-, two-, and three-dimensional titania structures. The 1D, 2D, and 3D titania structures have been mainly designed for possible applications, e.g., (i) continuous use without the necessity of particulate titania separation, (ii) efficient light harvesting (e.g., inverse opals), (iii) enhanced activity (fast charge carriers' separation, e.g., 1D nanoplates and 2D nanotubes). It should be pointed out that these structures might be also useful for mechanism investigation, e.g., (i) 3D titania aerogels with gold either incorporated inside the 3D network or supported in the porosity, and (ii) titania mesocrystals with gold deposited either on basal or lateral surfaces, for the clarification of plasmonic photocatalysis. Moreover, 0D nanostructures of special composition and morphology, e.g., magnetic(core)-titania(shell), mixed-phase titania (anatase/rutile/brookite), and faceted titania NPs have been presented, due to their exceptional properties, including easy separation in the magnetic field, high activity, and mechanism clarification, respectively. Although anatase has been usually thought as the most active phase of titania, the co-existence of other crystalline phases accelerates the photocatalytic activity significantly, and thus mixed-phase titania (e.g., famous P25) exhibits high photocatalytic activity for both oxidation and reduction reactions. It is believed that this review might be useful for the architecture design of novel nanomaterials for broad and diverse applications, including environmental purification, energy conversion, synthesis and preparation of "intelligent" surfaces with self-cleaning, antifogging, and antiseptic properties.

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“…For instance, TiO 2 , a representative photocatalytic material, was applied to LWAs to impart NO x and SO x reduction functionality [ 11 , 12 , 13 , 14 , 15 ]. It is well known that TiO 2 is superior to other photocatalytic materials, such as ZnO, SnO 2 , Fe 2 O 3 , CuO, NiO, and CeO 2 , in its ability to remove NO x and SO x by the photo-decomposition principle under UV light irradiation [ 16 , 17 ]. In addition, the enhanced photodegradation performance of a cement-based composite by controlling the content of TiO 2 in the cement-based composite [ 18 ], the impregnation and coating of sodium silicate on LWAs to provide self-healing properties [ 19 ], the improved skid-resistance of LWAs by controlling aggregate morphology through micro-surfacing [ 20 ], the hydrophobicity control of LWAs modified with sewage sludge [ 21 ], and the embedment of phase change materials into LWAs to improve thermal energy storage characteristics and reduce damage mitigation [ 9 , 22 ] have been studied.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Functionality of Epoxy–TiO2-Embedded High-Strength Lightweight Aggregates

et al. 2020

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With the increasing trend of high-rise, large-scale, and functional modern architectural structures, lightweight aggregate (LWA) concrete that exhibits excellent strength and high functionality has garnered active research attention. In particular, as the properties of concrete vary considerably with the raw materials and the proportions of aggregates in the mix, in-depth research on weight reduction, strength improvement, and functional enhancements of aggregates is crucial. This study used the negative pressure coating of a mixed solution comprising epoxy (mixture of epoxy resin and crosslinker), hyper-crosslinked polymer, and titanium oxide (TiO2) nanoparticles on the LWA, and achieved an improvement in the strength of the LWA as well as a reduction in air pollutants such as NOx and SOx. Compared to a normal LWA with an aggregate impact value (AIV) of 38.7%, the AIV of the proposed epoxy–TiO2-embedded high-strength functional LWA was reduced by approximately half to 21.1%. In addition, the reduction rates of NOx and SOx gases resulting from the photocatalytic properties of TiO2 nanoparticles coated with epoxy were approximately 90.9% and 92.8%, respectively. Epoxy–TiO2, embedded in LWAs through a mixture, exhibited stability, high strength, and a reduction in air pollutant characteristics, despite repeated water washing. The LWA proposed herein offers excellent structural and functional properties and is expected to be used in functional lightweight concrete that can be practically applied in high-rise and large-scale architectural structures.

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Titanium oxide based photocatalytic materials development and their role of in the air pollutants degradation: Overview and forecast

Cited by 246 publications

References 236 publications

Sunlight-Operated TiO2-Based Photocatalysts

Sunlight-Operated TiO2-Based Photocatalysts

Morphology- and Crystalline Composition-Governed Activity of Titania-Based Photocatalysts: Overview and Perspective

Enhancing Functionality of Epoxy–TiO2-Embedded High-Strength Lightweight Aggregates

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