Metal oxide photocatalysts

Grabowska, Ewelina; Marchelek, Martyna; Paszkiewicz-Gawron, Marta; Zaleska-Medynska, Adriana

doi:10.1016/b978-0-12-811634-0.00003-2

Cited by 26 publications

(23 citation statements)

References 896 publications

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“…To change the morphology, size and geometry, the individual operating the autoclave can change the precursors, alter the temperature and/or change the pH of the solution in the autoclave. Upon completion of the autoclave cycle, the products are then cooled to room temperature, washed, and then finally dried [ 71 , 72 , 73 ].…”

Section: Traditional Synthesis Methodsmentioning

confidence: 99%

Green Synthesis of Nanomaterials

et al. 2021

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Nanotechnology is considered one of the paramount forefronts in science over the last decade. Its versatile implementations and fast-growing demand have paved the way for innovative measures for the synthesis of higher quality nanomaterials. In the early stages, traditional synthesis methods were utilized, and they relied on both carcinogenic chemicals and high energy input for production of nano-sized material. The pollution produced as a result of traditional synthesis methods induces a need for environmentally safer synthesis methods. As the downfalls of climate change become more abundant, the scientific community is persistently seeking solutions to combat the devastation caused by toxic production methods. Green methods for nanomaterial synthesis apply natural biological systems to nanomaterial production. The present review highlights the history of nanoparticle synthesis, starting with traditional methods and progressing towards green methods. Green synthesis is a method just as effective, if not more so, than traditional synthesis; it provides a sustainable approach to nanomaterial manufacturing by using naturally sourced starting materials and relying on low energy processes. The recent use of active molecules in natural biological systems such as bacteria, yeast, algae and fungi report successful results in the synthesis of various nanoparticle systems. Thus, the integration of green synthesis in scientific research and mass production provides a potential solution to the limitations of traditional synthesis methods.

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Section: Traditional Synthesis Methodsmentioning

confidence: 99%

Green Synthesis of Nanomaterials

et al. 2021

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“…Most physical methods are based on a "top-down" approach (see Table 1) [27]. Various types of lithography are intensively used for nanostructure fabrication [28,44,54,55]. Among the "bottom-up" physical methods, typical examples are molecular beam epitaxy and various methods of evaporation (physical vapor deposition (PVD), magnetron sputtering, plasma-enhanced deposition, laser ablation, electric arc deposition, etc.)…”

Section: How Photoactive Heterostructures Are Madementioning

confidence: 99%

“…At least one of the components must be a semiconductor (or dielectric) that provides a condition for sufficiently long life-time for the excited state of the heterostructure which is necessary to initiate a further chemical sequence. The AB heterostructures can be classified based on the configuration and dimensions of the interface between two components, A and B, as follows (see Figure 1): one-dimensional (1D), two-dimensional (2D) and three-dimensional (3D) heterostructures [25][26][27][28][29][30][31]. In a one-dimensional heterostructure, the interface is of line-like shape, that is, the contact area is extended in one direction and not expanded in two others.…”

Section: Introductionmentioning

confidence: 99%

Photoactive Heterostructures: How They Are Made and Explored

et al. 2021

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In our review we consider the results on the development and exploration of heterostructured photoactive materials with major attention focused on what are the better ways to form this type of materials and how to explore them correctly. Regardless of what type of heterostructure, metal–semiconductor or semiconductor–semiconductor, is formed, its functionality strongly depends on the quality of heterojunction. In turn, it depends on the selection of the heterostructure components (their chemical and physical properties) and on the proper choice of the synthesis method. Several examples of the different approaches such as in situ and ex situ, bottom-up and top-down, are reviewed. At the same time, even if the synthesis of heterostructured photoactive materials seems to be successful, strong experimental physical evidence demonstrating true heterojunction formation are required. A possibility for obtaining such evidence using different physical techniques is discussed. Particularly, it is demonstrated that the ability of optical spectroscopy to study heterostructured materials is in fact very limited. At the same time, such experimental techniques as high-resolution transmission electron microscopy (HRTEM) and electrophysical methods (work function measurements and impedance spectroscopy) present a true signature of heterojunction formation. Therefore, whatever the purpose of heterostructure formation and studies is, the application of HRTEM and electrophysical methods is necessary to confirm that formation of the heterojunction was successful.

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“…[3] Recent research has proved that by using appropriate photocatalysts, aqueous organic pollutants such as methyl blue, methyl red, methyl orange can be converted into water, carbon dioxide, and non-hazardous inorganic compounds. [4,5] More than 10,000 different types of synthetic colors are annually produced and used in various textile and dyeing, [6] cosmetics, [7] leather, [8] and pharmaceuticals industries. Among the textile dyes, [9] Azo compound, which has a color group 1 N N in its molecular structure as the largest group dyeing materials, is used in the textile industry.…”

Section: Introductionmentioning

confidence: 99%

One‐step ultrasonic production of the chitosan/lactose/g‐C₃N₄ nanocomposites with lactose as a biological capping agent: Photocatalytic activity study

Karimi

Ranjbar

Mohadesi

2021

J Chinese Chemical Soc

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In this work, the basic and applied purpose was to synthesize and modify chitosan/lactose nanocomposites with g-C 3 N 4 structures using the ultrasonic-assisted electrospinning method. We evaluated effective photocatalytic of chitosan/lactose/g-C 3 N 4 nanocomposites to photodegrade methyl red, methyl orange, and methyl blue in different nanophotocatalyst concentration such as 0.1-1%g/L in pH 6.5. According to the experimental results, it was found that nanocomposites in different concentrations of g-C 3 N 4 had high potential in degradation of organic compounds. The lactose structures as a green capping agent and stabilizer modified chitosan surfaces to produce uniform particle size distribution. Different lactose concentrations like 0.1-0.5%wt/vol indicate a particle size range between 270 and 422 nm. The obtained as-synthesized nanomaterials were characterized by scanning electron microscope, energy-dispersive X-ray spectroscopy, transmission electron microscopy, X-ray diffraction (XRD), Fourier-transform

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Metal oxide photocatalysts

Cited by 26 publications

References 896 publications

Green Synthesis of Nanomaterials

Green Synthesis of Nanomaterials

Photoactive Heterostructures: How They Are Made and Explored

One‐step ultrasonic production of the chitosan/lactose/g‐C₃N₄ nanocomposites with lactose as a biological capping agent: Photocatalytic activity study

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Metal oxide photocatalysts

Cited by 26 publications

References 896 publications

Green Synthesis of Nanomaterials

Green Synthesis of Nanomaterials

Photoactive Heterostructures: How They Are Made and Explored

One‐step ultrasonic production of the chitosan/lactose/g‐C3N4 nanocomposites with lactose as a biological capping agent: Photocatalytic activity study

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Product

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One‐step ultrasonic production of the chitosan/lactose/g‐C₃N₄ nanocomposites with lactose as a biological capping agent: Photocatalytic activity study