Titania versus zinc oxide nanoparticles on mesoporous silica supports as photocatalysts for removal of dyes from wastewater at neutral pH

Maučec, Darja; Šuligoj, Andraž; Ristić, Alenka; Dražić, Goran; Pintar, Albin; Tušar, Nataša Novak

doi:10.1016/j.cattod.2017.05.061

Cited by 106 publications

(34 citation statements)

References 44 publications

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“…Wastewater derived from the textile dyeing industry is usually resistant to physicochemical treatments, and hence is not easily degraded in the conventional biological process. [ 1 ] Recently, researchers have shown an increased interest in heterogeneous photocatalysis which proved to be a promising green alternative for the efficient treatment of dye effluents. [ 2 ] This method is able to completely mineralize the target pollutants.…”

Section: Introductionmentioning

confidence: 99%

Supported TiO₂ on Kaolin, Cordierite, and Calcite for Photocatalytic Removal of Dyes from Wastewater

Ibrahim

EL-Mekkawi

Selim

2020

CLEAN Soil Air Water

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Kaolin, cordierite, and calcite are investigated as supports for TiO 2 . The prepared TiO 2 /support samples are examined for the removal of organic dyes from wastewater. The samples are preliminarily investigated to identify the optimal loaded system using synthetic wastewater containing methylene blue (MB). Data indicate that the investigated support significantly affects the photocatalytic activity of the supported TiO 2 . Low photocatalytic activity toward MB degradation is observed upon using TiO 2 /calcite when compared to the unsupported TiO 2 . Interaction between calcite and titania species probably occurrs to produce the less photoactive CaTiO 3 amorphous species. Anatase TiO 2 is obtained upon using kaolin and cordierite as supports. The low photocatalytic performance of the TiO 2 /kaolin sample is also observed. A high concentration of MB on TiO 2 /kaolin surfaces blocks the photoactive sites. TiO 2 /cordierite shows the highest photocatalytic activity compared to the unsupported TiO 2 as well as the other TiO 2 /support samples. Rigid cordierite particles suppress the agglomeration of TiO 2 particles during the preparation, leading to a high exposed surface of TiO 2 towards light illumination. TiO 2 /cordierite is investigated for the removal of organic dye from real wastewater collected from a textile dyeing factory. Color removal of up to 46% is achieved upon UV irradiation.

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Section: Introductionmentioning

confidence: 99%

Supported TiO₂ on Kaolin, Cordierite, and Calcite for Photocatalytic Removal of Dyes from Wastewater

Ibrahim

EL-Mekkawi

Selim

2020

CLEAN Soil Air Water

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“…However, the main limitation in their use for water remediation applications is the demand of energy and time consuming additional steps for their recovery from the treated water. To avoid these post-treatment steps, the photo-catalyst powders can be immobilized on suitable solid supports [9,10]. To this aim, polymeric supports have been recently introduced due to their low weight, flexibility, and easy conversion in different morphologies [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Au/ZnO Hybrid Nanostructures on Electrospun Polymeric Mats for Improved Photocatalytic Degradation of Organic Pollutants

Campagnolo

Lauciello

Athanassiou

et al. 2019

Water

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An innovative approach for the fabrication of hybrid photocatalysts on a solid porous polymeric system for the heterogeneous photocatalytic degradation of organic pollutants is herein presented. Specifically, gold/zinc oxide (Au/ZnO)-based porous nanocomposites are formed in situ by a two-step process. In the first step, branched ZnO nanostructures fixed on poly(methyl methacrylate) (PMMA) fibers are obtained upon the thermal conversion of zinc acetate-loaded PMMA electrospun mats. Subsequently, Au nanoparticles (NPs) are directly formed on the surface of the ZnO through an adsorption dipping process and thermal treatment. The effect of different concentrations of the Au ion solutions to the formation of Au/ZnO hybrids is investigated, proving that for 1 wt % of Au NPs with respect to the composite there is an effective metal–semiconductor interfacial interaction. As a result, a significant improvement of the photocatalytic performance of the ZnO/PMMA electrospun nanocomposite for the degradation of methylene blue (MB) and bisphenol A (BPA) under UV light is observed. Therefore, the proposed method can be used to prepare flexible fibrous composites characterized by a high surface area, flexibility, and light weight. These can be used for heterogeneous photocatalytic applications in water treatment, without the need of post treatment steps for their removal from the treated water which may restrict their wide applicability and cause secondary pollution.

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“…Water pollution is presently one of the most worrying health problems, influencing the life of all living beings. It also influences, among sectors with a large influence in the production of wastewater, the textile industry [1][2][3], which uses more than 100,000 different dyes, with roughly 280,000 tons lost in textile effluents every year [4,5]. Textile wastewater is commonly contaminated with high concentrations of organic substances derived from various residues of dyes and different chemical additives [3,5].…”

Section: Introductionmentioning

confidence: 99%

In situ Decolorization Monitoring of Textile Dyes for an Optimized UV-LED/TiO2 Reactor

2019

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Heterogeneous photocatalysis, using photocatalysts in suspension to eliminate diverse contaminants, including textile wastewater, has several advantages. Nevertheless, current absorbance and decolorization measurements imply sample acquisition by extraction at a fixed rate with consequent photocatalyst removal. This study presents online monitoring for the decolorization of six azo dyes, Orange PX-2R (OP2), Remazol Black B133 (RB), Procion Crimson H-EXL (PC), Procion Navy H-EXL (PN), Procion Blue H-EXL (PB), and Procion Yellow H-EXL (PY), analyzing the spectrum measured in situ by using the light scattering provided by the photocatalyst in suspension. The results obtained have corroborated the feasibility of obtaining absorbance and decolorization measurements, avoiding disturbances in the process due to a decrease in the volume in the reactor.

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Titania versus zinc oxide nanoparticles on mesoporous silica supports as photocatalysts for removal of dyes from wastewater at neutral pH

Cited by 106 publications

References 44 publications

Supported TiO₂ on Kaolin, Cordierite, and Calcite for Photocatalytic Removal of Dyes from Wastewater

Supported TiO₂ on Kaolin, Cordierite, and Calcite for Photocatalytic Removal of Dyes from Wastewater

Au/ZnO Hybrid Nanostructures on Electrospun Polymeric Mats for Improved Photocatalytic Degradation of Organic Pollutants

In situ Decolorization Monitoring of Textile Dyes for an Optimized UV-LED/TiO2 Reactor

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Titania versus zinc oxide nanoparticles on mesoporous silica supports as photocatalysts for removal of dyes from wastewater at neutral pH

Cited by 106 publications

References 44 publications

Supported TiO2 on Kaolin, Cordierite, and Calcite for Photocatalytic Removal of Dyes from Wastewater

Supported TiO2 on Kaolin, Cordierite, and Calcite for Photocatalytic Removal of Dyes from Wastewater

Au/ZnO Hybrid Nanostructures on Electrospun Polymeric Mats for Improved Photocatalytic Degradation of Organic Pollutants

In situ Decolorization Monitoring of Textile Dyes for an Optimized UV-LED/TiO2 Reactor

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Supported TiO₂ on Kaolin, Cordierite, and Calcite for Photocatalytic Removal of Dyes from Wastewater

Supported TiO₂ on Kaolin, Cordierite, and Calcite for Photocatalytic Removal of Dyes from Wastewater