Suspension of ZnO Nanostructures Synthesized by Hot Water Treatment for Photocatalytic Wastewater Treatment

Hariharalakshmanan, Ranjitha K.; Martínez, Juan José; Ergul-Yilmaz, Busra; Karabacak, Tansel

doi:10.1007/s11270-023-06192-0

Cited by 7 publications

References 64 publications

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Emerging ZnO Semiconductors for Photocatalytic CO₂ Reduction to Methanol

Kshirsagar,

Shelake,

Biswas

et al. 2024

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Carbon recycling is poised to emerge as a prominent trend for mitigating severe climate change and meeting the rising demand for energy. Converting carbon dioxide (CO2) into green energy and valuable feedstocks through photocatalytic CO2 reduction (PCCR) offers a promising solution to global warming and energy needs. Among all semiconductors, zinc oxide (ZnO) has garnered considerable interest due to its ecofriendly nature, biocompatibility, abundance, exceptional semiconducting and optical properties, cost‐effectiveness, easy synthesis, and durability. This review thoroughly discusses recent advances in mechanistic insights, fundamental principles, experimental parameters, and modulation of ZnO catalysts for direct PCCR to C1 products (methanol). Various ZnO modification techniques are explored, including atomic size regulation, synthesis strategies, morphology manipulation, doping with cocatalysts, defect engineering, incorporation of plasmonic metals, and single atom modulation to boost its photocatalytic performance. Additionally, the review highlights the importance of photoreactor design, reactor types, geometries, operating modes, and phases. Future research endeavors should prioritize the development of cost‐effective catalyst immobilization methods for solid‐liquid separation and catalyst recycling, while emphasizing the use of abundant and non‐toxic materials to ensure environmental sustainability and economic viability. Finally, the review outlines key challenges and proposes novel directions for further enhancing ZnO‐based photocatalytic CO2 conversion processes.

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Emerging ZnO Semiconductors for Photocatalytic CO₂ Reduction to Methanol

Kshirsagar,

Shelake,

Biswas

et al. 2024

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Growth of zinc oxide nanowires by a hot water deposition method

Saadi,

Hassan,

Sayem

et al. 2024

Nanotechnology

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Recently, various methods have been developed for synthesizing zinc oxide (ZnO) nanostructures, including physical and chemical vapor deposition, as well as wet chemistry. These common methods require either high temperature, high vacuum, or toxic chemicals. In this study, we report the growth of zinc oxide ZnO nanowires by a new hot water deposition (HWD) method on various types of substrates, including copper plates, foams, and meshes, as well as on indium tin oxide (ITO)-coated glasses (ITO/glass). HWD is derived from the hot water treatment (HWT) method, which involves immersing piece(s) of metal and substrate(s) in hot deionized water (DI) water and does not require any additives or catalysts. Metal acts as the source of metal oxide molecules that migrate in water and deposit on the substrate surface to form metal oxide nanostructures (MONSTRs). The morphological and crystallographic analyses of the source-metals and substrates revealed the presence of uniformly crystalline ZnO nanorods after the HWD. In addition, the growth mechanism of ZnO nanowires using HWD is discussed. This process is simple, inexpensive, low temperature, scalable, and eco-friendly. Moreover, HWD can be used to deposit a large variety of MONSTRs on almost any type of substrate material or geometry.

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Durability of metal oxide nanostructures synthesized by hot water treatment

Hammer,

Hariharalakshmanan,

Sayem

et al. 2024

MRS Communications

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Metal oxide nanostructures (MONSTRs) have become popular in various fields. This study investigates the durability of MONSTRs synthesized through hot water treatment (HWT) using copper, aluminum, and zinc as the source metals of choice. The physical durability tests include pressure, scratch, and scotch tape adhesion tests, and chemical durability tests such as corrosion resistance tests, heat resistance, and solar exposure tests. Results showed that MONSTRs synthesized from HWT are highly durable under the tested conditions except for NaOH and HCl immersion tests for copper oxide and zinc oxide. The study concluded that HWT is a sustainable synthesis method for MONSTRs. Graphical Abstract

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Suspension of ZnO Nanostructures Synthesized by Hot Water Treatment for Photocatalytic Wastewater Treatment

Cited by 7 publications

References 64 publications

Emerging ZnO Semiconductors for Photocatalytic CO₂ Reduction to Methanol

Emerging ZnO Semiconductors for Photocatalytic CO₂ Reduction to Methanol

Growth of zinc oxide nanowires by a hot water deposition method

Durability of metal oxide nanostructures synthesized by hot water treatment

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Suspension of ZnO Nanostructures Synthesized by Hot Water Treatment for Photocatalytic Wastewater Treatment

Cited by 7 publications

References 64 publications

Emerging ZnO Semiconductors for Photocatalytic CO2 Reduction to Methanol

Emerging ZnO Semiconductors for Photocatalytic CO2 Reduction to Methanol

Growth of zinc oxide nanowires by a hot water deposition method

Durability of metal oxide nanostructures synthesized by hot water treatment

Contact Info

Product

Resources

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Emerging ZnO Semiconductors for Photocatalytic CO₂ Reduction to Methanol

Emerging ZnO Semiconductors for Photocatalytic CO₂ Reduction to Methanol