BiOCl/WS<sub>2</sub> hybrid nanosheet (2D/2D) heterojunctions for visible-light-driven photocatalytic degradation of organic/inorganic water pollutants

Ashraf, Waseem; Bansal, Shikha; Singh, Vikrant; Barman, Sanmitra; Khanuja, Manika

doi:10.1039/d0ra02916e

Cited by 50 publications

(13 citation statements)

References 71 publications

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“…This increment indicates the evolution of new radiative pathways, which boost the transfer of a greater number of photoexcited electrons for HER. Similar observations were reported in the case of a WS 2 –BiOCl composite [ 39 ].…”

Section: Resultssupporting

confidence: 88%

One-Pot Synthesis of Chlorophyll-Assisted Exfoliated MoS2/WS2 Heterostructures via Liquid-Phase Exfoliation Method for Photocatalytic Hydrogen Production

2021

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Developing strategies for producing hydrogen economically and in greener ways is still an unaccomplished goal. Photoelectrochemical (PEC) water splitting using photoelectrodes under neutral electrolyte conditions provides possibly one of the greenest routes to produce hydrogen. Here, we demonstrate that chlorophyll extracts can be used as an efficient exfoliant to exfoliate bulk MoS2 and WS2 to form a thin layer of a MoS2/WS2 heterostructure. Thin films of solution-processed MoS2 and WS2 nanosheets display photocurrent densities of −1 and −5 mA/cm2, respectively, and hydrogen evolution under simulated solar irradiation. The exfoliated WS2 is significantly more efficient than the exfoliated MoS2; however, the MoS2/WS2 heterostructure results in a 2500% increase in photocurrent densities compared to the individual constituents and over 12 h of PEC durability under a neutral electrolyte. Surprisingly, in real seawater, the MoS2/WS2 heterostructure exhibits stable hydrogen production after solar illumination for 12 h. The synthesis method showed, for the first time, how the MoS2/WS2 heterostructure can be used to produce hydrogen effectively. Our findings highlight the prospects for this heterostructure, which could be coupled with various processes towards improving PEC efficiency and applications.

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Section: Resultssupporting

confidence: 88%

One-Pot Synthesis of Chlorophyll-Assisted Exfoliated MoS2/WS2 Heterostructures via Liquid-Phase Exfoliation Method for Photocatalytic Hydrogen Production

2021

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“…These observations indicate that the incorporation of Fe 2 O 3 in the composite influences the growth along the (001) and the (002) planes in the BiOCl 0.5 Br 0.5 , whereas the shift in the peak position for the (002) plane to a lower angle for the composite indicates slight expansion of the interplanar spacing compared to BiOCl 0.5 Br 0.5 based on the Bragg's law (Table 1). 18 According to previously published literature reports, this increase in the interplanar spacing could be due to the replacement of some of the Bi atoms with Fe atoms. This also suggests a strong interaction between Fe 2 O 3 and BiOCl 0.5 Br 0.5 as reported by other authors for similar systems 19 .…”

Section: Resultsmentioning

confidence: 87%

Visible light‐driven photocatalytic degradation of methyl orange by Fe₂O₃‐BiOCl_0.5Br_0.5 composite photocatalyst

Barman

Singh

Bag

et al. 2021

Asia-Pacific J Chem Eng

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In this paper, a novel composite photocatalyst, ferric oxide–bismuth oxyhalide (Fe2O3‐BiOCl0.5Br0.5) has been synthesized, characterized, and used for the degradation of methyl orange through advanced oxidation process under ambient conditions (sunlight, pH 7.0, and temperature 25°C). The catalyst has been characterized by using UV‐Vis spectrophotometer, Fourier transform infrared (FTIR) spectroscopy, Raman spectrometer, scanning electron microscopy (SEM), energy dispersive X‐ray analysis (EDX), and X‐ray diffractometer (XRD) techniques. The catalyst shows appreciable activities under natural sunlight conditions. From the XRD patterns and SEM images, it is observed that the elongation along the z axis in the crystal lattice of BiOCl0.5Br0.5 in the catalyst can lead to a lattice distortion induced internal electric field which can help in charge carrier separation and transport. The Fe2O3‐BiOCl0.5Br0.5 catalyst shows more than 90% photodegradation efficiency of methyl orange in 90 min of sunlight exposure. The presence of magnetic ferric oxide in the composite photocatalyst helps to isolate the catalyst from the reaction mixture by using an external magnet, and thus, the Fe2O3‐BiOCl0.5Br0.5 catalyst can be reused repeatedly, towards degradation of organic pollutants.

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“…• is protonated to produce H 2 O 2 and therefore, the OH • radical remains at last. Finally, the conversion of the hazardous dye (RB) into CO 2 and water takes place e ciently (4)(5)(6)(7).…”

Section: Mechanism Of Dye Degradationmentioning

confidence: 99%

“…Hence, nanoparticles with high photocatalytic properties are being explored as a solution to eliminate harmful pollutants from water bodies. Semiconductor-based metal oxide nanoparticles (MNPs) are capable of removing organic pollutants from wastewater streams and exhibit good catalytic activity [4][5][6] . The higher catalytic activity is due to the interaction of light rays (photon) and the catalyst that yields CO 2 and H 2 O [7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

Novel 3D-Flower Shaped KTaO3 Nanostructures: A Perovskite with Highly Efficient Photocatalytic and H2 Generation Ability

Praveen

Sumedha

Shashank

et al. 2022

Preprint

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Treatment of industrial wastewater is one of the biggest challenges that mankind is facing today to prevent environmental pollution and its associated adverse effects on human health. Environmentalists across the world have given a clarion call for dye degradation, wastewater treatment and their effective management in our surrounding habitats. Despite significant progress in the development of new water treatment technologies, new materials haven’t matured enough for large scale industrial applications. Hence, the development of new scalable and sustainable multifunctional materials having the potential to treat wastewater and generate energy is the need of the hour. In this direction, novel 3D-flower shaped KTaO3 (3D-F-KT) material has been synthesized using areca seed powder as a green fuel. This new material has been successfully applied for the treatment of industrial wastewater contaminated with Rose Bengal. The efficiency of the material was analysed using several parameters like catalytic loading, dye concentration, kinetic and scavenging experiments, photostability and recyclability. In addition, the material was subjected to optical studies and H2 generation, making it a highly versatile multifunctional material, exhibiting a degradation efficiency of 94% in a short span of 150 minutes and a photocatalytic H2 generation efficiency of 374 mmolg− 1 through water splitting. With an immense potential, KTaO3 presents itself as a multifunctional catalyst that can be scaled up for a variety of industrial applications ranging from wastewater treatment to energy generation and storage.

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BiOCl/WS₂ hybrid nanosheet (2D/2D) heterojunctions for visible-light-driven photocatalytic degradation of organic/inorganic water pollutants

Abstract:
Achieved highest photocatalytic performance of 2D/2D BiOCl/WS₂ (2%) hybrid nanosheets for MG degradation (∼98.4% in 45 min) and Cr(vi) reduction.

Cited by 50 publications

References 71 publications

One-Pot Synthesis of Chlorophyll-Assisted Exfoliated MoS2/WS2 Heterostructures via Liquid-Phase Exfoliation Method for Photocatalytic Hydrogen Production

One-Pot Synthesis of Chlorophyll-Assisted Exfoliated MoS2/WS2 Heterostructures via Liquid-Phase Exfoliation Method for Photocatalytic Hydrogen Production

Visible light‐driven photocatalytic degradation of methyl orange by Fe₂O₃‐BiOCl_0.5Br_0.5 composite photocatalyst

Novel 3D-Flower Shaped KTaO3 Nanostructures: A Perovskite with Highly Efficient Photocatalytic and H2 Generation Ability

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BiOCl/WS2 hybrid nanosheet (2D/2D) heterojunctions for visible-light-driven photocatalytic degradation of organic/inorganic water pollutants

Abstract: Achieved highest photocatalytic performance of 2D/2D BiOCl/WS2 (2%) hybrid nanosheets for MG degradation (∼98.4% in 45 min) and Cr(vi) reduction.

Cited by 50 publications

References 71 publications

One-Pot Synthesis of Chlorophyll-Assisted Exfoliated MoS2/WS2 Heterostructures via Liquid-Phase Exfoliation Method for Photocatalytic Hydrogen Production

One-Pot Synthesis of Chlorophyll-Assisted Exfoliated MoS2/WS2 Heterostructures via Liquid-Phase Exfoliation Method for Photocatalytic Hydrogen Production

Visible light‐driven photocatalytic degradation of methyl orange by Fe2O3‐BiOCl0.5Br0.5 composite photocatalyst

Novel 3D-Flower Shaped KTaO3 Nanostructures: A Perovskite with Highly Efficient Photocatalytic and H2 Generation Ability

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BiOCl/WS₂ hybrid nanosheet (2D/2D) heterojunctions for visible-light-driven photocatalytic degradation of organic/inorganic water pollutants

Abstract:
Achieved highest photocatalytic performance of 2D/2D BiOCl/WS₂ (2%) hybrid nanosheets for MG degradation (∼98.4% in 45 min) and Cr(vi) reduction.

Visible light‐driven photocatalytic degradation of methyl orange by Fe₂O₃‐BiOCl_0.5Br_0.5 composite photocatalyst