Development of TiO2-C photocatalysts for solar treatment of polluted water

Matos, Juan; Miralles-Cuevas, S.; Ruíz-Delgado, A.; Oller, Isabel; Malato, Sixto

doi:10.1016/j.carbon.2017.06.091

Cited by 74 publications

(29 citation statements)

References 76 publications

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“…The nanostructures include 0D quantum dots, [74] 1D rod-like, 2D sheet-like, [75] and 3D sphere -like structures. [76,77] Xiao et al fabricated honeycomb-like porous g-C 3 N 4 , [78] with higher specific surface area and enlarged band gap, significantly improving photocatalytic degradation activity. It also triggered a strong synergy between photocatalysis and ozonation, where the material adopted a bridging role between visible-light irradiation and ozone molecules.…”

Section: Morphology Controlmentioning

confidence: 99%

Photocatalytic Advanced Oxidation Processes for Water Treatment: Recent Advances and Perspective

Liu

Wang

2020

Chemistry An Asian Journal

195

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Nowadays, an ever-increasing variety of organic contaminants in water has caused hazards to the ecological environment and human health. Many of them are persistent and non-biodegradable. Various techniques have been studied for sewage treatment, including biological, physical and chemical methods. Photocatalytic advanced oxidation processes (AOPs) have received increasing attention due to their fast reaction rates and strong oxidation capability, low cost compared with the non-photolytic AOPs. This review is dedicated to summarizing up-to-date research progress in photocatalytic AOPs, such as Fenton or Fenton-like reaction, ozonation and sulfate radical-based advanced oxidation processes. Mechanisms and activation processes are discussed. Then, the paper summarizes photocatalytic materials and modification strategies, including defect chemistry, morphology control, heterostructure design, noble metal deposition. The future perspectives and challenges are also discussed.

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Section: Morphology Controlmentioning

confidence: 99%

Photocatalytic Advanced Oxidation Processes for Water Treatment: Recent Advances and Perspective

Liu

Wang

2020

Chemistry An Asian Journal

195

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“…The nanostructured titanium (IV) oxide has high chemical and thermal stability, and with special doping by impurity levels in an electronic structure, it is uniquely capable of the creating new functional materials on itself, especially for (photo)catalysis, sensors, adsorption, and photovoltaics. The highly dispersed doped TiO 2 for the creation of a photocatalyst that would work efficiently in the visible spectrum, as well as the components of devices for the efficient conversion of solar energy into electricity (solar cells), is of particular interest [104][105][106][107][108][109].…”

Section: Properties Of Metal Oxides In the Different States Ofmentioning

confidence: 99%

Metaloxide Nanomaterials and Nanocomposites of Ecological Purpose

Dontsova

Nahirniak

Астрелін

2019

Journal of Nanomaterials

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The features of the properties and creation of nanocomposite metal oxide materials, especially TiO2, ZnO, SnO2, ZrO2, and Fe3O4, and their applications for ecology are considered in the article. It is shown that nanomaterials based on them are very promising for use in the ecological direction, especially as sorbents, photocatalysts, and sensitive layers of gas sensors. The crystallochemical characteristics, surface structure, and surface phenomena that occur when they enter the water and air environment are given for these metal oxides, and it is shown that they play a significant role in obtaining the sorption and catalytic characteristics of these nanomaterials. Particular attention is paid to the dispersion and morphology of metal oxide particles by which their physical and chemical properties can be controlled. Synthesis methods of metal oxide nanomaterials and ways for creating of nanocomposites based on them are characterized, and it is noted that there are many methods for obtaining individual nanoparticles of metal oxides with certain properties. The main task is the correct selection and testing of parameters. The prospects for the production of metal oxide nanocomposites and their application for environmental applications are noted, which will lead to a fundamentally new class of materials and new environmental technologies with their participation.

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“…TiO 2 nanoparticles in the excited state are capable of generating free radicals resulting in photoinduced reactions like disinfection [1,2,3,4,5], degradation of various organic pollutants [6,7,8,9], and production of H 2 , as an alternative green energy source [8,10,11,12]. Despite the well-known advantages of TiO 2 (it is cheap, chemically stable, and available in large quantities in pure form), it has relatively wide band gap (3.02 eV for rutile and 3.20 eV for anatase [13]).…”

Section: Introductionmentioning

confidence: 99%

“…These included doping with various non-metals [2,6,10,14], modifying with noble metals [15,16,17], sensitizing with dyes [18,19], synthesizing TiO 2 with various morphologies [11,20], and coupling TiO 2 with other semiconductors [21,22,23]. A promising direction is the use of different forms of carbon, e.g., carbon nanotubes [2,24,25,26], graphite oxide [27], activated carbon [7], graphene [28], and graphene oxide [1]. Carbon materials have the potential of improving the photocatalytic activity of TiO 2 by (1) narrowing the band gap of the semiconductor, (2) decreasing the recombination rate of photogenerated charge carriers, (3) providing more active reaction/adsorption centers in greater amounts and higher surface area, (4) acting as a photosensitizer for the photocatalytic reactions, and (5) prolonging the lifespan of charge carriers [27,29,30].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Carbon Nanospheres in Photocatalyst Production: From Composites to Highly Active Hollow Structures

et al. 2019

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Titanium dioxide–carbon sphere (TiO2–CS) composites were constructed via using prefabricated carbon spheres as templates. By the removal of template from the TiO2–CS, TiO2 hollow structures (HS) were synthesized. The CS templates were prepared by the hydrothermal treatment of ordinary table sugar (sucrose). TiO2–HSs were obtained by removing CSs with calcination. Our own sensitized TiO2 was used for coating the CSs. The structure of the CSs, TiO2–CS composites, and TiO2–HSs were characterized by scanning electron microscopy (SEM), infrared spectroscopy (IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and diffuse reflectance spectroscopy (DRS). The effect of various synthesis parameters (purification method of CSs, precursor quantity, and applied furnace) on the morphology was investigated. The photocatalytic activity was investigated by phenol model pollutant degradation under visible light irradiation (λ > 400 nm). It was established that the composite samples possess lower crystallinity and photocatalytic activity compared to TiO2 hollow structures. Based on XPS measurements, the carbon content on the surface of the TiO2–HS exerts an adverse effect on the photocatalytic performance. The synthesis parameters were optimized and the TiO2–HS specimen having the best absolute and surface normalized photocatalytic efficiency was identified. The superior properties were explained in terms of its unique morphology and surface properties. The stability of this TiO2–HS was investigated via XRD and SEM measurements after three consecutive phenol degradation tests, and it was found to be highly stable as it entirely retained its crystal phase composition, morphology and photocatalytic activity.

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Development of TiO2-C photocatalysts for solar treatment of polluted water

Cited by 74 publications

References 76 publications

Photocatalytic Advanced Oxidation Processes for Water Treatment: Recent Advances and Perspective

Photocatalytic Advanced Oxidation Processes for Water Treatment: Recent Advances and Perspective

Metaloxide Nanomaterials and Nanocomposites of Ecological Purpose

Utilization of Carbon Nanospheres in Photocatalyst Production: From Composites to Highly Active Hollow Structures

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