TiO 2 and its composites as effective photocatalyst for glucose degradation processes
TL;DR: In this paper, a composite material was obtained through a combination of properties of titanium dioxide and activated carbon, which demonstrated highly developed surface characteristics and exhibit significantly higher activity in comparison with samples of pure TiO2 synthesized the same way, existing analogues of pureTiO2 from TiCl3 and even industrial photocatalyst.
Abstract: Titanium-dioxide photocatalyst was impregnated onto the activated carbon using originally developed low-temperature sol–gel method to form a TiO2:AC composite material. 15% (mass.) solution Ti2(SO4)3 in sulphuric acid was used as a precursor for photocatalyst synthesis. The highly effective composite material was obtained through a combination of properties of titanium dioxide and activated carbon. Synthesized composites TiO2 with activated carbon demonstrate highly developed surface characteristics and exhibit significantly higher activity in comparison with samples of pure TiO2 synthesized the same way, existing analogues of pure TiO2 synthesized from TiCl3 and even industrial photocatalyst. This was testified by the degradation of 1% aqueous glucose solution using TiO2:AC, samples of pure TiO2 and commercial TiO2 AEROXIDE® TiO2 P25 produced by EVONIK Industries.
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TL;DR: In this paper, the authors reviewed the recent developments on the photocatalytic oxidation of biomass and its derivatives into value-added chemicals, including the nature of the biomass and derived molecules, nature of a photocatalyst, the efficiency of the copatalysts in terms of conversion and selectivity, influence of reaction conditions and light sources, effect of additives and mechanistic pathways.
22 citations
15 Jul 2020
13 citations
TL;DR: In this paper, a method of zinc (II) oxide synthesis by precipitation of zinc(II) acetate precursor has been developed, and it was found that ZnO particles have a size of less than 100nm.
Abstract: The method of zinc (II) oxide synthesis by precipitation of zinc (II) acetate precursor has been developed. With the method of scanning electron microscopy, it was found that ZnO particles have a size of less than 100 nm. It contains a pure phase of zinc (II) oxide of the hexagonal syngony of the wurtzite type, which was proved by the X-ray diffraction method. The absorption spectrum of suspension of the obtained zinc (II) oxide powder was obtained and the optical bandgap was calculated by the Kubelka–Munk formula. The synthesized zinc (II) oxide is a well-crystallized solid material with semiconductor properties and a clear bandgap, starting at 3.1 eV. The resulting zinc (II) oxide has a BET surface area of 22 m2/g, as a result of which, its total porosity and micropore volume are small: 0.13 cm3/g and 0.06 cm3/g, respectively. It confirms that the obtained ZnO is a well-crystallized, non-porous material. The photocatalytic activity of the synthesized zinc (II) oxide is very high towards the dyes of both, anionic and cationic natures. The experimentally achieved values of the photocatalytic decomposition degree of the studied dyes indicate to an ambiguous influence of the model photocatalytic process organization on the efficiency of ZnO.
6 citations
TL;DR: In this article , a facile two-stage hydrothermal-wet impregnation method was used to synthesize Cu 2 S/TiO 2 nanocomposites with varying concentration of TiO 2 QDs.
6 citations
01 Jan 2020
TL;DR: In this article, the authors take a look at results of research related to the study of several aspects regarding composite materials with photocatalytic properties that contain titanium dioxide as the active component.
Abstract: Composite materials consisting of titanium dioxide and adsorbents with developed surface area draw the attention of researchers and industry for the last two decades. Combination of adsorption of pollutant molecules on the active sites of inert support of composite, followed by their diffusion towards photocatalytically active centers is the main reason to draw attention to this class of materials. The proposed review takes a look at results of research related to the study of several aspects regarding composite materials with photocatalytic properties that contain titanium dioxide as photocatalytically active component. The composite materials demonstrate enhanced degradation rates of pollutants compared to pure TiO2 photocatalysts. It is considered to be one of the key aspects, effected by a number of factors, which include surface area, adsorption capacity, the strength of interaction, the immobilization of photocatalyst particles onto the surface of composite, and operation parameters (such as temperature, and pH).
2 citations
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TL;DR: This review summarizes the recently developed countermeasures for improving the performance of TiO2-based photocatalytic degradation of organic pollutants with respect to the visible-light photocatallytic activity, adsorption capacity, stability and separability.
946 citations
TL;DR: In this article, the photocatalytic degradation of dyes in aqueous solution using TiO2 as photocatalyst under solar and UV irradiation has been reviewed.
Abstract: Traditional chemical, physical and biological processes for treating wastewater containing textile dye have such disadvantages as high cost, high energy requirement and generation of secondary pollution during treatment process. The advanced oxidation processes technology has been attracting growing attention for the decomposition of organic dyes. Such processes are based on the light-enhanced generation of highly reactive hydroxyl radicals, which oxidize the organic matter in solution and convert it completely into water, CO2 and inorganic compounds. In this presentation, the photocatalytic degradation of dyes in aqueous solution using TiO2 as photocatalyst under solar and UV irradiation has been reviewed. It is observed that the degradation of dyes depends on several parameters such as pH, catalyst concentration, substrate concentration and the presence of oxidants. Reaction temperature and the intensity of light also affect the degradation of dyes. Particle size, BET-surface area and different mineral forms of TiO2 also have influence on the degradation rate.
604 citations
TL;DR: Anatase TiO2 coatings on highly porous activated carbon were prepared by a novel method, atmospheric pressure metal organic chemical vapor deposition (AP-MOCVD), at a source temperature of 423 K.
170 citations
TL;DR: Better performances with this promising material – TiO2 deposited onto AC – compared withTiO2 powder could be explained by the vicinity of photocatalytic and AC adsorption sites.
Abstract: A sequential adsorption/photocatalytic regeneration process to remove tartrazine, an azo-dye in aqueous solution, has been investigated. The aim of this work was to compare the effectiveness of an adsorbent/photocatalyst composite – TiO2 deposited onto activated carbon (AC) – and a simple mixture of powders of TiO2 and AC in same proportion. The composite was an innovative material as the photocatalyst, TiO2, was deposited on the porous surface of a microporous-AC using metal-organic chemical vapour deposition in fluidized bed. The sequential process was composed of two-batch step cycles: every cycle alternated a step of adsorption and a step of photocatalytic oxidation under ultra-violet (365 nm), at 25°C and atmospheric pressure. Both steps, adsorption and photocatalytic oxidation, have been investigated during four cycles. For both materials, the cumulated amounts adsorbed during four cycles corresponded to nearly twice the maximum adsorption capacities qmax proving the photocatalytic oxidation to rege...
90 citations
TL;DR: In this article, the effect of various parameters such as initial dye concentration, catalyst loading, pH of the medium, source and intensity of illumination on the photocatalytic degradation of acid violet using ZnO:AC were investigated.
Abstract: Zinc oxide photocatalyst was impregnated onto the activated carbon under mild hydrothermal conditions (T=150°C, P = 20–30 bars) to form a ZnO:AC composite material. The ZnO:AC composite was characterized using powder X-ray diffraction (XRD), Fourier infrared spectroscopy (FTIR), BET surface area measurements and scanning electron microscopy (SEM). As-prepared ZnO:AC composite exhibited higher photocatalytic activity when compared to the commercial ZnO and untreated activated carbon; this was testified by the degradation of acid violet dye using ZnO:AC and commercial ZnO. The effect of various parameters such as initial dye concentration, catalyst loading, pH of the medium, source and intensity of illumination on the photocatalytic degradation of acid violet using ZnO:AC were investigated. Real time textile effluents have also been considered for the degradation using ZnO:AC composites. The reduction in the chemical oxygen demand (COD) values of the treated effluents revealed a complete destruction of the organic molecules along with the color removal.
77 citations