Design of visible-light photocatalysts by coupling of inorganic semiconductors

Bera, Sandipan; Won, Dong-Il; Rawal, Sher Bahadur; Kang, Hye Jin; Lee, Wan In

doi:10.1016/j.cattod.2018.11.001

Cited by 49 publications

(24 citation statements)

References 175 publications

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“… 6 TiO 2 has been widely used since the discovery of its water splitting capability by Fujishima and Honda in 1971 7 because it has numerous advantages such as low costs and chemical stability. 5 However, its practical applicability as a photocatalyst has been restricted by its large band gap, fast recombination of photoinduced charge carriers, and poor adsorption capacity for most organic chemicals. 8 , 9 Numerous methods were employed to address all these problems like doping, 10 co-doping, 11 formation of heterojunctions with other semiconductors, 12 surface sensitization, 13 etc., which could hardly be corrected concurrently at optimum conditions.…”

Section: Introductionmentioning

confidence: 99%

Co₃O₄/Bi₄O₅I₂/Bi₅O₇I C-Scheme Heterojunction for Degradation of Organic Pollutants by Light-Emitting Diode Irradiation

Malefane

2020

ACS Omega

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Remediation of organic pollutant matrixes from wastewater by photodegradation using different heterojunctions is extensively studied to improve performance for potential application. Brilliant black (BB) and p -nitrophenol (PNP) have been detected in the environment and implicated as directly or indirectly carcinogenic to human health. This work analyzes their elimination from aqueous solutions under visible-light irradiation with composites of cobalt(II, III) oxide and bismuth oxyiodides (Co 3 O 4 /Bi 4 O 5 I 2 /Bi 5 O 7 I). The synthesized nanomaterial properties were investigated using various techniques such as BET, SEM/EDS, TEM, XRD, FTIR, PL, and UV–vis. All the nanocomposites absorbed in the visible range of the solar spectrum with band gaps between 1.68 and 2.79 eV, and the specific surface area of the CB2 composite increased by 35.8% from that of Bi 4 O 5 I 2 /Bi 5 O 7 I. There was an observed massive reduction in the rate of electron and hole recombination, and the band gaps of the composites decreased. The mineralization of PNP and BB was followed by determination of the total organic carbon with reductions of 93.6 and 83.7%, respectively. The main active species were the hydroxyl radicals, while the superoxide anion radical and generated holes were minor as confirmed by radical trapping experiments. The optimum pHs for degradation of PNP and BB were 9.6 and 5.3, respectively. The enhanced performance of the catalyst was due to C-scheme heterojunction formation that reduced the electron and hole recombination rate and was attributed to strong adsorption of the pollutants on the photocatalyst active surface. The nanocomposite is apposite for solar energy-driven remediation of organic pollutants from environmental aqueous samples.

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Section: Introductionmentioning

confidence: 99%

Co₃O₄/Bi₄O₅I₂/Bi₅O₇I C-Scheme Heterojunction for Degradation of Organic Pollutants by Light-Emitting Diode Irradiation

Malefane

2020

ACS Omega

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“…Coupling with semiconductors such as ZnO, WO 3 , SnO 2 , CdS, and Fe 3 O 4 : coupling TiO 2 with another semiconductor material with lower gap energy forming a heterojunction is an advantageous option. The semiconductor of low-gap energy plays the role of sensitizer by being excited first and then inducing the excitation of TiO 2 by the passage of photoelectrons from its conduction band to that of titanium dioxide (Bera et al 2019;Zhang et al 2020). 3.…”

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confidence: 99%

Recent progress on Ag/TiO2 photocatalysts: photocatalytic and bactericidal behaviors

Chakhtouna

Benzeid

Zari

et al. 2021

Environ Sci Pollut Res

216

111

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For many decades, titanium dioxide (TiO 2 ) semiconductor has been extensively applied in several environmental applications due to its higher photocatalytic performances toward different organic pollutants, pharmaceutical compounds, and bacteria. However, its shortfall response to visible light, and the expeditious recombination rate of the photogenerated electron-hole pairs, hampers its utilization. Doping TiO 2 semiconductor with silver nanoparticles is a sound strategy to (1) extend its photocatalytic activity to visible light, (2) prevent the electron/holes pairs recombination due to the formation of the Schottky barrier at the interfaces with TiO 2 that act as an electron-trapping center, and (3) enhance its bactericide performances. This review focuses on the recent progress on silver-doped titanium dioxide (Ag/TiO 2 )-based photocatalysts. It addresses a wide range of Ag/TiO 2 synthesis techniques, their physicochemical properties and discusses thoroughly the important role of silver (Ag) nanoparticles in enhancing the removal capacity and antibacterial performances of the Ag/TiO 2 photocatalysts.

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“…The low quantum yield of broadband semiconductors such as pure TiO 2 and ZnO, as well as the photodegradation of ZnO, make their use difficult in photocatalytic applications 14 . Suitable semiconductor heterojunctions between two or more semiconductors in which synergistic interactions between the components promote separation and transfer of photogenerated charges and reduce recombination rates have been shown to significantly improve photocatalytic processes 15 . Even mechanical mixing of ZnO/TiO 2 with 1–7% TiO 2 catalyses the photodegradation of organic dyes more efficiently than the semiconductors on their own, which has been attributed to the formation of p-ZnO by substitution of Ti 4+ by Zn 2+ in the interface between both oxides 16 .…”

Section: Introductionmentioning

confidence: 99%

ZnO nucleation into trititanate nanotubes by ALD equipment techniques, a new way to functionalize layered metal oxides

Moreno

Arredondo

Ramasse

et al. 2021

Sci Rep

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In this contribution, we explore the potential of atomic layer deposition (ALD) techniques for developing new semiconductor metal oxide composites. Specifically, we investigate the functionalization of multi-wall trititanate nanotubes, H2Ti3O7 NTs (sample T1) with zinc oxide employing two different ALD approaches: vapor phase metalation (VPM) using diethylzinc (Zn(C2H5)2, DEZ) as a unique ALD precursor, and multiple pulsed vapor phase infiltration (MPI) using DEZ and water as precursors. We obtained two different types of tubular H2Ti3O7 species containing ZnO in their structures. Multi-wall trititanate nanotubes with ZnO intercalated inside the tube wall sheets were the main products from the VPM infiltration (sample T2). On the other hand, MPI (sample T3) principally leads to single-wall nanotubes with a ZnO hierarchical bi-modal functionalization, thin film coating, and surface decorated with ZnO particles. The products were mainly characterized by electron microscopy, energy dispersive X-ray, powder X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. An initial evaluation of the optical characteristics of the products demonstrated that they behaved as semiconductors. The IR study revealed the role of water, endogenous and/or exogenous, in determining the structure and properties of the products. The results confirm that ALD is a versatile tool, promising for developing tailor-made semiconductor materials.

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Design of visible-light photocatalysts by coupling of inorganic semiconductors

Cited by 49 publications

References 175 publications

Co₃O₄/Bi₄O₅I₂/Bi₅O₇I C-Scheme Heterojunction for Degradation of Organic Pollutants by Light-Emitting Diode Irradiation

Co₃O₄/Bi₄O₅I₂/Bi₅O₇I C-Scheme Heterojunction for Degradation of Organic Pollutants by Light-Emitting Diode Irradiation

Recent progress on Ag/TiO2 photocatalysts: photocatalytic and bactericidal behaviors

ZnO nucleation into trititanate nanotubes by ALD equipment techniques, a new way to functionalize layered metal oxides

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Design of visible-light photocatalysts by coupling of inorganic semiconductors

Cited by 49 publications

References 175 publications

Co3O4/Bi4O5I2/Bi5O7I C-Scheme Heterojunction for Degradation of Organic Pollutants by Light-Emitting Diode Irradiation

Co3O4/Bi4O5I2/Bi5O7I C-Scheme Heterojunction for Degradation of Organic Pollutants by Light-Emitting Diode Irradiation

Recent progress on Ag/TiO2 photocatalysts: photocatalytic and bactericidal behaviors

ZnO nucleation into trititanate nanotubes by ALD equipment techniques, a new way to functionalize layered metal oxides

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Product

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Co₃O₄/Bi₄O₅I₂/Bi₅O₇I C-Scheme Heterojunction for Degradation of Organic Pollutants by Light-Emitting Diode Irradiation

Co₃O₄/Bi₄O₅I₂/Bi₅O₇I C-Scheme Heterojunction for Degradation of Organic Pollutants by Light-Emitting Diode Irradiation