Recent developments in ZnO-based heterostructures as photoelectrocatalysts for wastewater treatment: A review

Rajput, Rekha B.; Shaikh, Rahilah; Sawant, J. G.; Kale, Rohidas B.

doi:10.1016/j.envadv.2022.100264

Cited by 21 publications

(11 citation statements)

References 93 publications

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“…Among the three types, the ZnO wurtzite structure has the highest thermodynamic stability. [83] ZnO is also listed as a "generally recognized as safe" material by the Food and Drug Administration. [84][85][86][87][88] In the literature, ZnO with diverse morphologies such as nanoflowers, nanorods, nanoparticles, nano/microspheres, nanobelts, nanosheets, nanowires, nanotubes, nanoprisms, nanopillars, etc., has been described.…”

Section: Zno Nanostructuresmentioning

confidence: 99%

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Metal Oxides‐Based Nano/Microstructures for Photodegradation of Microplastics

Kumar¹

2023

Advanced Sustainable Systems

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The ubiquitous presence of microplastics in the environment has raised serious environmental and health concerns. These tiny plastic particles can enter the food chain, posing a significant threat to human health. Researchers worldwide have focused their efforts on developing strategies to mitigate microplastic pollution. This review focuses on the potential of nano/microstructured metal oxide semiconductors as effective photocatalysts for microplastic degradation. The review is divided into two sections: static metal oxides and dynamic micromachines based on metal oxides. The modifications made to nano/microstructured metal oxides such as TiO2, ZnO, bismuth oxyhalides (BiOX), NiO, Cu2O/CuO, perovskite‐like Bi2WO6, Fe3O4, etc., to enhance their degradation efficiency are thoroughly discussed and reviewed. Additionally, the photocatalytic pathways for the conversion of microplastics into C2 fuel and other value‐added products are also elaborated. The current developments in the realm of dynamic, self‐propelled, and controlled micromotors for the photodegradation of microplastics are also highlighted. The review concludes by proposing future perspectives and challenges to facilitate the remediation of microplastics in water and wastewater systems in a more effective, scalable, and environmentally friendly manner. Overall, the review emphasizes the potential of photocatalysis using nano/microstructured metal oxide semiconductors as an eco‐friendly and promising approach for microplastic degradation.

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Section: Zno Nanostructuresmentioning

confidence: 99%

“…Among the three types, the ZnO wurtzite structure has the highest thermodynamic stability. [ 83 ] ZnO is also listed as a “generally recognized as safe” material by the Food and Drug Administration. [ 84–88 ]…”

Section: Strategies Adopted For Microplastic Degradation Using Nano/m...mentioning

confidence: 99%

Metal Oxides‐Based Nano/Microstructures for Photodegradation of Microplastics

Kumar¹

2023

Advanced Sustainable Systems

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“…Several techniques including adsorption were used to treat the pollutants in wastewater. However, the incomplete removal of the contaminants and the generation of secondary pollutants are the main drawbacks of these conventional methods. − Interestingly, a semiconducting photocatalytic route is a promising technique for complete removal of the toxic organic pollutants. ,, Basically, the commercially available TiO 2 is a UV-active photocatalyst with low photoactivity under natural sunlight. − The ZnO photocatalyst has gained much attention because it shows excellent transport property, is inexpensive, and has a versatile morphology. − In addition, based on our previous studies, controlled synthesis can be performed very easily for the creation of ZnO with high performance and also with a low cost of production. ,,− Therefore, in comparison to TiO 2 , ZnO is much cheaper and very easy to synthesize controllably. Nevertheless, low sunlight performance and occurrence of the photocorrosion are the main drawbacks influencing the practical application of ZnO .…”

Section: Introductionmentioning

confidence: 99%

“… 5 , 16 , 17 Basically, the commercially available TiO 2 is a UV-active photocatalyst with low photoactivity under natural sunlight. 26 − 31 The ZnO photocatalyst has gained much attention because it shows excellent transport property, is inexpensive, and has a versatile morphology. 32 − 34 In addition, based on our previous studies, controlled synthesis can be performed very easily for the creation of ZnO with high performance and also with a low cost of production.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound-Assisted Synthesis of a ZnO/BiVO₄ S-Scheme Heterojunction Photocatalyst for Degradation of the Reactive Red 141 Dye and Oxytetracycline Antibiotic

et al. 2023

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The preparation of novel sunlight active photocatalysts for complete removal of pollutants from aqueous solutions is a vital research topic in environmental protection. The present work reports the synthesis of a ZnO/BiVO4 S-scheme heterojunction photocatalyst for degradation of the reactive red dye and oxytetracycline antibiotic in wastewater. ZnO and BiVO4 were first fabricated by a hydrothermal technique, and then, the ZnO/BiVO4 heterostructure was synthesized using an ultrasonic route. An increase of the surface area, compared to that of ZnO, was found in ZnO/BiVO4. The enhancement of charge separation efficiency at the interface was obtained so that a remarkable enhancement of the photocatalytic performance was detected in the prepared heterojunction photocatalyst. Complete detoxification of harmful pollutants was achieved by using the economical solar energy. The removal of the pollutants follows the first-order reaction with the highest rate constant of 0.107 min–1. The stability of the prepared photocatalyst was detected after five cycles of use. The ZnO/BiVO4 S-scheme heterostructure photocatalyst still provides high photoactivity even after five times of use. Hydroxyl radicals play an important role in the removal of the pollutant. This work demonstrates a new route to create the step-scheme heterojunction with high photoactivity for complete removal of the toxic dye and antibiotic in the environment.

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“…Over the past decade, water pollution caused by organic dye and antibiotic residues has become increasingly serious due to its widespread use in various industries and modern medicine [ 1 ]. As an efficient, economical, and green water pollution treatment, photocatalytic degradation can mineralize organic dye and antibiotic residues into H 2 O, CO 2 , and mineral acids by utilizing solar light [ 2 ]. Due to the nontoxic nature, low cost, and high activity [ 3 ], zinc oxide (ZnO) nanoparticles for photodegradation in wastewater have been extensively investigated, such as ZnO nanoflowers [ 4 ], ZnO nanoflakes [ 5 , 6 ], ZnO nanobelts [ 7 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Morphological Control of Supported ZnO Nanosheet Arrays and Their Application in Photodegradation of Organic Pollutants

Wang

Gao

et al. 2023

Nanomaterials

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Supported nanostructured photocatalysis is considered to be a sustainable and promising method for water pollution photodegradation applications due to its fascinating features, including a high surface area, stability against aggregation, and easy handling and recovery. However, the preparation and morphological control of the supported nanostructured photocatalyst remains a challenge. Herein, a one-step hydrothermal method is proposed to fabricate the supported vertically aligned ZnO nanosheet arrays based on aluminum foil. The morphologically controlled growth of the supported ZnO nanosheet arrays on a large scale was achieved, and the effects of hydrothermal temperature on morphologic, structural, optical, and photocatalytic properties were observed. The results reveal that the surface area and thickness of the nanosheet increase simultaneously with the increase in the hydrothermal temperature. The increase in the surface area enhances the photocatalytic activity by providing more active sites, while the increase in the thickness reduces the charge transfer and thus decreases the photocatalytic activity. The influence competition between the area increasing and thickness increasing of the ZnO nanosheet results in the nonlinear dependence between photocatalytic activity and hydrothermal temperature. By optimizing the hydrothermal growth temperature, as fabricated and supported ZnO nanosheet arrays grown at 110 °C have struck a balance between the increase in surface area and thickness, it exhibits efficient photodegradation, facile fabrication, high recyclability, and improved durability. The RhB photodegradation efficiency of optimized and grown ZnO nanosheet arrays increased by more than four times that of the unoptimized structure. With 10 cm2 of as-fabricated ZnO nanosheet arrays, the degradation ratio of 10 mg/L MO, MB, OFL, and NOR was 85%, 51%, 58%, and 71% under UV irradiation (365 nm, 20 mW/cm2) for 60 min. All the target pollutant solutions were almost completely degraded under UV irradiation for 180 min. This work offers a facile way for the fabrication and morphological control of the supported nanostructured photocatalyst with excellent photodegradation properties and has significant implications in the practical application of the supported nanostructured photocatalyst for water pollution photodegradation.

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Recent developments in ZnO-based heterostructures as photoelectrocatalysts for wastewater treatment: A review

Cited by 21 publications

References 93 publications

Metal Oxides‐Based Nano/Microstructures for Photodegradation of Microplastics

Metal Oxides‐Based Nano/Microstructures for Photodegradation of Microplastics

Ultrasound-Assisted Synthesis of a ZnO/BiVO₄ S-Scheme Heterojunction Photocatalyst for Degradation of the Reactive Red 141 Dye and Oxytetracycline Antibiotic

Morphological Control of Supported ZnO Nanosheet Arrays and Their Application in Photodegradation of Organic Pollutants

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Recent developments in ZnO-based heterostructures as photoelectrocatalysts for wastewater treatment: A review

Cited by 21 publications

References 93 publications

Metal Oxides‐Based Nano/Microstructures for Photodegradation of Microplastics

Metal Oxides‐Based Nano/Microstructures for Photodegradation of Microplastics

Ultrasound-Assisted Synthesis of a ZnO/BiVO4 S-Scheme Heterojunction Photocatalyst for Degradation of the Reactive Red 141 Dye and Oxytetracycline Antibiotic

Morphological Control of Supported ZnO Nanosheet Arrays and Their Application in Photodegradation of Organic Pollutants

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Ultrasound-Assisted Synthesis of a ZnO/BiVO₄ S-Scheme Heterojunction Photocatalyst for Degradation of the Reactive Red 141 Dye and Oxytetracycline Antibiotic