Perspective and status of polymeric graphitic carbon nitride based Z-scheme photocatalytic systems for sustainable photocatalytic water purification

Kumar, Abhinandan; Raizada, Pankaj; Saini, Reena V.; Hosseini-Bandegharaei, Ahmad

doi:10.1016/j.cej.2019.123496

Cited by 353 publications

(95 citation statements)

References 188 publications

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“…The charge carriers are generated upon UVC irradiation and the electrons in the valence band get excited to the conduction band. The photogenerated charge carriers then travel to the surface of β-Ga 2 O 3 where they take part in redox reactions [22,23]. The basic mechanism of photocatalytic decomposition is derived from the oxidation of organisms to H 2 O, CO 2 along with -OH or O 2 radicals produced on the surface of β-Ga 2 O 3 under UCV irradiation [2,8].…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Photocatalytic Activity of β-Ga2O3 Nanostructures for Decomposition of Formaldehyde under Deep Ultraviolet Irradiation

Lee

Doan

Park³

et al. 2020

Catalysts

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An attempt to degrade volatile organic compounds (VOCs) and sterilize air simultaneously is highly desirable to improve indoor air quality. With the help of deep ultraviolet (UVC) lighting, harmful bacteria that exists in the air can be destroyed. Thus, a new photocatalytic substance that can break down VOCs under UVC irradiation is required. Here, we demonstrate the photocatalytic activity of β-Ga2O3 nanostructures, synthesized via the solvothermal method for removing formaldehyde (HCHO) under deep ultraviolet irradiation. The Raman and XRD results indicated that as-synthesized nanostructures showed β-crystalline phase with a monoclinic structure. The photoluminescence spectrum exhibited a broad and strong green emission peak at 510 nm, which was likely attributed to a considerable amount of oxygen and gallium vacancies formed during the calcinating process. The photocatalytic efficiency for decomposing HCHO at room temperature under deep ultraviolet irradiation (278 nm) of the synthesized β-Ga2O3 nanoparticles is higher than that of the β-Ga2O3 nanorods. Both nanoparticles and nanorods obeyed the pseudo-first-order Langmuir-Hinshelwood kinetic model with a degradation rate constant of 0.057 and 0.033 min−1, corresponding to the efficiency of 82% and 62% in the formaldehyde removal, respectively.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Photocatalytic Activity of β-Ga2O3 Nanostructures for Decomposition of Formaldehyde under Deep Ultraviolet Irradiation

Lee

Doan

Park³

et al. 2020

Catalysts

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“…Moreover, the heterostructure facilitates the transportation of the generated carriers and broadens the visible light response, which is consist with the results shown in Figure 5. [26] From Figure 6b, it can be seen that the reasonable matching of the band energy between SrT and ZnO provides a separation channel for the separation of electrons and holes, which contributes to the enhancement of the photocatalytic efficiency of the catalyst. [27,28]…”

Section: Formation Mechanism and Energy Level Distribution Of Zno@srtmentioning

confidence: 96%

Synthesis and Characterization of a Novel Rambutan‐like ZnO@SrTiO₃/TiO₂ Microsphere

2020

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Designing gradient energy levels is an effective method to improve the photocatalytic performance of the semiconductor materials. In this work, we propose a core‐shell structured material with micro‐sized spherical SrTiO3/TiO2 (abbreviated as SrT) as the core material, and the rod‐shaped ZnO shell attaching on the surface of SrT, which forms a hierarchical spherical composite with rambutan‐like shape. During the synthesis process, ZnO seeds are coated on the surface of SrT microspheres firstly, and then they transfer to nanorods with a diameter of 60–70 nm and a length of less than 100 nm under the growth solution medium at 90 °C with the volume ratio of zinc nitrate to hexamethylenetetramine (abbreviated as HMT) is 1 : 1 and the concentration is 0.05 mol/L. This structure may further facilitate the separation of the photo‐generated electron‐hole pairs and widen the photocatalytic applications of perovskite structured SrTiO3 or anatase structured TiO2 with visible excitation response.

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“…Since the adsorption of pollutants on the surface of solids plays a critical role in heterogeneous photocatalysis, the effect of adsorption on photocatalytic process has been investigated. Simultaneous adsorption and photocatalytic processes has been used for degradation of phenol pollutants with noticeable recyclability and stability of the photocatalyst [24], bacterial disinfection [25], photocatalytic water purification [26][27][28], and photocatalytic mineralization of phenolic compounds.…”

Section: Fundamentals and Mechanism Of Photocatalytic Reactionsmentioning

confidence: 99%

Biomedical Waste Management by Using Nanophotocatalysts: The Need for New Options

et al. 2020

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Biomedical waste management is getting significant consideration among treatment technologies, since insufficient management can cause danger to medicinal service specialists, patients, and their environmental conditions. The improvement of waste administration protocols, plans, and policies are surveyed, despite setting up training programs on legitimate waste administration for all healthcare service staff. Most biomedical waste substances do not degrade in the environment, and may also not be thoroughly removed through treatment processes. Therefore, the long-lasting persistence of biomedical waste can effectively have adverse impact on wildlife and human beings, as well. Hence, photocatalysis is gaining increasing attention for eradication of pollutants and for improving the safety and clearness of the environment due to its great potential as a green and eco-friendly process. In this regard, nanostructured photocatalysts, in contrast to their regular counterparts, exhibit significant attributes such as non-toxicity, low cost and higher absorption efficiency in a wider range of the solar spectrum, making them the best candidate to employ for photodegradation. Due to these unique properties of nanophotocatalysts for biomedical waste management, we aim to critically evaluate various aspects of these materials in the present review and highlight their importance in healthcare service settings.

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Perspective and status of polymeric graphitic carbon nitride based Z-scheme photocatalytic systems for sustainable photocatalytic water purification

Cited by 353 publications

References 188 publications

Synthesis and Photocatalytic Activity of β-Ga2O3 Nanostructures for Decomposition of Formaldehyde under Deep Ultraviolet Irradiation

Synthesis and Photocatalytic Activity of β-Ga2O3 Nanostructures for Decomposition of Formaldehyde under Deep Ultraviolet Irradiation

Synthesis and Characterization of a Novel Rambutan‐like ZnO@SrTiO₃/TiO₂ Microsphere

Biomedical Waste Management by Using Nanophotocatalysts: The Need for New Options

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Perspective and status of polymeric graphitic carbon nitride based Z-scheme photocatalytic systems for sustainable photocatalytic water purification

Cited by 353 publications

References 188 publications

Synthesis and Photocatalytic Activity of β-Ga2O3 Nanostructures for Decomposition of Formaldehyde under Deep Ultraviolet Irradiation

Synthesis and Photocatalytic Activity of β-Ga2O3 Nanostructures for Decomposition of Formaldehyde under Deep Ultraviolet Irradiation

Synthesis and Characterization of a Novel Rambutan‐like ZnO@SrTiO3/TiO2 Microsphere

Biomedical Waste Management by Using Nanophotocatalysts: The Need for New Options

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Synthesis and Characterization of a Novel Rambutan‐like ZnO@SrTiO₃/TiO₂ Microsphere