Decolorization and degradation of reactive azo dyes via heterogeneous photocatalytic processes

Σούτσας, Κ.; Karayannis, Vayos; Poulios, Ioannis; Riga, Asimina; Ntampegliotis, K.; Spiliotis, X.; Papapolymerou, G.

doi:10.1016/j.desal.2009.09.054

Cited by 131 publications

(60 citation statements)

References 29 publications

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“…We observe an improvement of the discoloration by increasing the catalyst mass. This can be explained by the availability of more active sites on the surface of the tested photocatalyst 33,34 . When the concentration of HAP/11 wt.…”

Section: Effect Of the Amount Of Hap/11 Wt %Timentioning

confidence: 99%

Study of the photocatalytic degradation of methylene blue dye using titanium-doped hydroxyapatite

et al. 2015

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Organic dyes and colouring textile agents are persistent pollutant materials that are difficult to decompose by microbiological treatment processes. Their oxidation through photocatalysis is an alternative way to prevent contamination of the environment. In this work, calcium deficient hydroxyapatite (HAP) was synthesized and doped with different amounts of titanium. Its performance in photocatalytic degradation of -methylene blue dye (MB) was then demonstrated. The main parameters which govern the photocatalytic treatment efficiency, such as doped titanium amount, pH, initial concentration of MB, weight of catalyst added to solution, UV-irradiation period and bubbling oxygen-have been-investigated. Photodegradation of MB is found to be effective with HAP/11 wt. %Ti in oxygenated medium. However, pH has no significant effect on the yield of discoloration.

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Section: Effect Of the Amount Of Hap/11 Wt %Timentioning

confidence: 99%

Study of the photocatalytic degradation of methylene blue dye using titanium-doped hydroxyapatite

et al. 2015

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“…TiO 2 is the most investigated semiconductor catalyst particularly because of its great potential in the treatment of environmental pollution [9] and it is chemically stable, nontoxic, and inexpensive [10][11][12]. However, TiO 2 has an important disadvantage as it is usually commercially available as powder and, therefore, a posttreatment separation stage is needed [13,14] and hence it would be highly desirable to have the possibility of supporting the TiO 2 active phase on other structured inorganic materials.…”

Section: Introductionmentioning

confidence: 99%

Ceramic-Based 3D Printed Supports for Photocatalytic Treatment of Wastewater

Hernández-Afonso

Fernández-González

Esparza

et al. 2017

Journal of Chemistry

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3D printing technology has become a powerful tool to produce 3D structures in any type of materials. In this work, 3D printing technology is used to produce 3D porous structures in CaSO 4 which can be later activated with an appropriate photocatalyst. TiO 2 was selected as an ideal photocatalyst producing activated 3D structures which can be used to study their effectiveness in the degradation of pollutants in wastewater. Methylene blue was used as a model molecule in these studies. The photocatalytic studies showed that TiO 2 -activated 3D structures using nanoparticles of SiO 2 in the process produce more than 50% of conversion of methylene blue in just 1 h of irradiation and almost 90% in 5 h.

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“…Their toxicity, stability to natural decomposition and persistence in the environment has been the cause of much concern to societies and regulatory bodies around the world [1]. Thymol blue (TB) is used in the textile, leather goods, industrial paints, food, plastics, cosmetics, and consumer electronic sectors [2].…”

Section: Introductionmentioning

confidence: 99%

Cr-N co-doped ZnO nanoparticles: synthesis, characterization and photocatalytic activity for degradation of thymol blue

Nibret¹,

Yadav²,

Dı́az³

et al. 2015

Bull. Chem. Soc. Eth.

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ABSTRACT.Here we report the synthesis of CrN co-doped ZnO for the first time. Zinc oxide (ZnO) nanoparticles were synthesized by direct precipitation method via the reaction between zinc nitrate [Zn(NO3)2 .6H2O] and ammonium carbonate [(NH4)2CO3] in aqueous solutions with proper concentration. Modified photocatalysts were synthesized by the incipient wetness impregnation method (chromium-doped ZnO) and by solid state reactions using ZnO and urea as precursors (nitrogen-doped ZnO). Chromium-nitrogen co-doped ZnO nanomaterials were prepared from the already prepared N-doped ZnO nanomaterials via one step impregnation method. The as-synthesized photocatalysts were investigated by XRD, BET, SEM-EDX, FTIR, and UV-Vis techniques. Photocatalytic degradation of thymol blue using as-synthesized photocatalysts was studied under visible as well as UV irradiations. Highest photocatalytic degradation efficiency of chromium-nitrogen co-doped zinc oxide could be attributed to the lower rate of recombination of the photo-generated electrons and holes as well as to its lower band gap energy as the result of the co-doping. Photocatalytic degradation is found to follow pseudo first order kinetics.

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Decolorization and degradation of reactive azo dyes via heterogeneous photocatalytic processes

Cited by 131 publications

References 29 publications

Study of the photocatalytic degradation of methylene blue dye using titanium-doped hydroxyapatite

Study of the photocatalytic degradation of methylene blue dye using titanium-doped hydroxyapatite

Ceramic-Based 3D Printed Supports for Photocatalytic Treatment of Wastewater

Cr-N co-doped ZnO nanoparticles: synthesis, characterization and photocatalytic activity for degradation of thymol blue

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