Superior adsorption and photodegradation of eriochrome black-T dye by Fe3+ and Pt4+ impregnated TiO2 nanostructures of different shapes

Pal, Bonamali; Kaur, Rupinder; Grover, Inderpreet Singh

doi:10.1016/j.jiec.2015.09.033

Cited by 56 publications

(20 citation statements)

References 31 publications

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“…Oxygen dissolved in solution is commonly employed as an electron acceptor in photocatalysis reaction to assure sufficient electron scavengers present to trap the excited conduction band electron from recombination [72]. The oxygen does not affect the adsorption on the TiO 2 catalyst surface as the reduction reaction takes place at a different location from where oxidation occurs.…”

Section: Dissolved Oxygenmentioning

confidence: 99%

A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials

Kumar

Gajanan

ey³

2017

MSEIJ

207

124

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The oxidation rates and efficiency of the photocatalytic system are highly dependent on a number of operational parameters that govern the photodegradation of the organic molecule. Several study have been reported the significance of operational parameter. The photodegradation depends on the some basic parameters which are concentration of substrate, amount of photocatalyst, pH of the solution, temperature of reaction medium, time of irradiation of light, the intensity of light, surface area of photocatalyst, dissolve oxygen in the reaction medium, nature of the photocatalyst, nature of the substrate, doping of metal ions and non metal and structure of photocatalyst and substrate. The photodegradation of organic compound have been studied by the several scientists and conclude the optimum conditions for the photodegradation of organic compound.The photodegradation of organic compounds was found maximum at low concentration of organic substrate with optimum amount of photocatalyst. The pH of the solution is also affect the photodegradation of organic substrate. The Titania show the maximum adsorption at low pH hence the photodegradation also found maximum at low pH. The surface area is the crucial factor for the photodegradation of organic substrate. If we are increasing the surface area of photocatalyst, the photodegradation of organic substrate increase. This is because that the number of active site increased with increasing the surface area. The amount of photocatalyst is the primary requirement of any photocatalysis process. The amount of photocatalyst should be optimum, if we take the high amount of photocatalyst the photodegradation is decreased, if we take the low amount of photocatalyst the photodegradation also decreased. The doping of metal ions and non-metal ions affect the photodegradation of organic substrate. Therefore, we have to use the metal ions which increased the positive charge on the surface of photocatalyst. The temperature and irradiation of light also affect the photodegradation of organic substrate. For the maximum photodegradation, the photocatalytic reaction should perform at room temperature not greater than 80 °C. The light of irradiation should be used which exit the electron easily from valence band to conduction band or equal to band gap energy. Keywords: A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials 2/10Copyright: ©2017 Kumar et al. for the removal of pollutants at high concentrations. The biological treatments are very slow, dispose large amount of sludge and required strict control of proper pH and temperature [21]. In this regard photo catalytic processes have advantages for the removal of pollutants even at low concentration for industrial waste water [22]. Moreover in photo oxidation, complete oxidation of organic pollutants take place within few hours, even at ppb level, without formation of secondary hazardous products using highly active and cheap catalysts which can be used in specially design reactor systems [23].Ti...

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Section: Dissolved Oxygenmentioning

confidence: 99%

A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials

Kumar

Gajanan

ey³

2017

MSEIJ

207

124

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“…Conventional methods used to remove dyes from the wastewater, like biological processes, flocculation, coagulation, filtration, and precipitation, have some drawbacks, mainly due to a low removal efficiency [5,6], since dyes are stable to the light and the oxidizing agent [7]. On the contrary, a promising alternative is the heterogeneous photocatalysis [8,9], which is an advanced oxidation technology that allows removal of a great variety of organic pollutants with a very efficient degradation rate [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Zinc Oxide Nanoparticles Obtained by Supercritical Antisolvent Precipitation for the Photocatalytic Degradation of Crystal Violet Dye

et al. 2019

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In this work, the synthesis of zinc oxide (ZnO) photocatalyst from thermal decomposition of zinc acetate (ZnAc) nanoparticles obtained by supercritical antisolvent (SAS) precipitation was investigated. The optimization of calcination conditions of the SAS ZnAc was carried out, studying the effect of temperature (in the range 300–600 °C) on the production of ZnO nanoparticles. In particular, it was demonstrated that the organic residues in ZnO and its particle size, thus the specific surface area, strongly affect the photocatalytic performances. SAS micronization of ZnAc produces regular nanoparticles with a mean diameter of about 54.5 ± 11.5 nm, whereas unprocessed ZnAc is characterized by very large crystals. The experimental results evidenced that ZnAc prepared by SAS process calcined at 500 °C showed a regular nanometric structure (mean diameter: 65.0 ± 14.5 nm) and was revealed to be the best choice for the photocatalytic removal of crystal violet dye (CV). In fact, the photocatalytic activity performances of ZnO nanoparticles prepared by this route were higher with respect to that of ZnO from unprocessed ZnAc calcined at 500 °C (which is characterized by irregular tetrapods with mean size 181.1 ± 65.5 nm). The optimized photocatalyst was able to assure the complete CV decolorization in 60 min of UV irradiation time and a mineralization degree higher than 90% after 120 min of treatment time.

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“…In view of the above, the combination of narrow‐band‐gap HT with wide‐band‐gap TiO 2 is expected to improve the harvesting of visible photons and photocatalytic efficiency under solar light illumination. Moreover, loading of metals is well known to enhance the photocatalytic performance of TiO 2 …”

Section: Introductionmentioning

confidence: 99%

Coupling copper and hydrogenated TiO₂ to bare TiO₂ structures for improved photocatalytic performance

Kim

2017

J Am Ceram Soc

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Coupling of metals and hydrogenated TiO 2 (HT) to bare TiO 2 may improve synergistically the photocatalytic activity of TiO 2 for pollutant decomposition.Herein, we address this issue by investigating the photocatalytic performances of Cu-loaded HT (CuHT)/bare TiO 2 (CuHTT) heterojunction nanocomposites for the degradation of harmful n-butanol under simulated solar light illumination. CuHTT with a CuHT-to-TiO 2 composition ratio of 0.1 showed a photocatalytic efficiency exceeding those of four reference photocatalysts, exhibiting the advantages of improved visible light absorption efficiency, charge carrier separation, and adsorption capacity. Increasing the CuHT-to-TiO 2 ratio from 0.01 to 0.1 improved the photocatalytic efficiency of CuHTT, whereas a further increase to 0.9 resulted in a decreased photocatalytic efficiency. Moreover, the photocatalytic efficiency improved as relative humidity increased from 20% to 70%, decreasing upon its further increase to 95%. The efficiencies of n-butanol to CO 2 conversion over CuHTT were lower than the corresponding decomposition efficiencies. Incompletely oxidized CO and three organic vapors (butanal, propanal, and 1-propanol) were determined as major intermediates. A possible mechanism for CuHTT-catalyzed photodegradation under simulated solar illumination was proposed. K E Y W O R D Sconversion efficiency, heterojunction nanocomposite, n-butanol, synergistic effect

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Superior adsorption and photodegradation of eriochrome black-T dye by Fe3+ and Pt4+ impregnated TiO2 nanostructures of different shapes

Cited by 56 publications

References 31 publications

A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials

A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials

Zinc Oxide Nanoparticles Obtained by Supercritical Antisolvent Precipitation for the Photocatalytic Degradation of Crystal Violet Dye

Coupling copper and hydrogenated TiO₂ to bare TiO₂ structures for improved photocatalytic performance

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Superior adsorption and photodegradation of eriochrome black-T dye by Fe3+ and Pt4+ impregnated TiO2 nanostructures of different shapes

Cited by 56 publications

References 31 publications

A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials

A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials

Zinc Oxide Nanoparticles Obtained by Supercritical Antisolvent Precipitation for the Photocatalytic Degradation of Crystal Violet Dye

Coupling copper and hydrogenated TiO2 to bare TiO2 structures for improved photocatalytic performance

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Coupling copper and hydrogenated TiO₂ to bare TiO₂ structures for improved photocatalytic performance