Parameters affecting the photocatalytic degradation of dyes using TiO2-based photocatalysts: A review

Akpan, U.G.; Hameed, B.H.

doi:10.1016/j.jhazmat.2009.05.039

Cited by 1,664 publications

(650 citation statements)

References 118 publications

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“…The reduction in the degradation efficiency aer 10 catalytic cycles, can be explained by the material loss during the recovering procedure because of the difficulty to avoid any loss of catalyst materials during the washing and ltration process. [32][33][34][35] Aer ten cycles of reusability test, TiO 2 NPs were analysed using XRD and FESEM to determine its phase, porosity and morphology stability. Fig.…”

Section: Xps Analysismentioning

confidence: 99%

Green synthesis of mesoporous anatase TiO₂nanoparticles and their photocatalytic activities

et al. 2017

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Titanium dioxide (TiO 2 ) materials have been the focus of many promising applications due to their low-cost, availability and biocompatible properties. In this study, mesoporous anatase TiO 2 nanoparticles were synthesised using a green chemistry approach. This visible-light active photocatalyst was prepared via a simple and solvent free precipitation method at low temperatures using titanium tetraisopropoxide (TTIP) as a precursor and soluble starch as the template. The effect of initial solution pH and concentration of TTIP on surface morphology and photocatalytic activities of TiO 2 nanoparticles were evaluated. Based on the results obtained, the TiO 2 nanocatalyst prepared using 0.01 mol of TTIP under basic conditions revealed the best photocatalytic activity. The as-synthesised nanoparticles were further characterised using X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and nitrogen adsorption analysis (NAA). The XRD spectrum confirmed that the catalyst was composed of anatase tetragonal TiO 2 phase. The Brunauer-Emmett-Teller (BET) surface area of 81.59 m 2 g À1 proved the presence of mesopores (average pore size ¼ 8.7 nm) which partially contributed to and catalysed the photodegradation process of methylene blue (MB) solution under sunlight. The effects of various parameters such as initial dye concentration, catalyst dosage and recyclability of the catalyst were evaluated to determine the best conditions. Results obtained suggest that TiO 2 nanoparticles synthesised through the green chemistry approach under optimum conditions exhibited an effective photodegradation process of MB solution under sunlight.

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Section: Xps Analysismentioning

confidence: 99%

Green synthesis of mesoporous anatase TiO₂nanoparticles and their photocatalytic activities

et al. 2017

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“…Titania (TiO2) has been regarded as one of the most efficient photocatalysts since the first report by Fujishima and Honda [3][4][5][6], because of its high catalytic activity, good stability and low toxicity. After that, huge progress towards improving the photocatalytic efficiency of TiO2 has been made [7], such as band-tailoring by element doping [8,9], constructing mesoporous and/or array structures [10][11][12][13], and plasmonic sensitizing [14,15].…”

Section: Introductionmentioning

confidence: 99%

Carbon coated Au/TiO2 mesoporous microspheres: a novel selective photocatalyst

Liu

Wang

et al. 2017

Sci. China Mater.

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Photocatalysts with desirable selectivity to transformation and purification of targeted pollutants are of great importance in water purification. Here, we demonstrate that selective photocatalysis can be realized by the assistance of gold-enhanced selective adsorption onto carbon-coated Au/TiO2 mesoporous microspheres (Au/TiO2@C-MM), which were prepared via a surfactant-assisted two-step method that involved the assembly of oleic acid-stabilized titania and gold nanoparticles into colloidal spheres in an emulsion using sodium dodecyl sulfate as a surfactant and the conversion of the surfactants into carbon under annealing in Ar. Due to the negatively charged amorphous carbon, the mesoporous structure, and the surface plasmon resonance absorption of the Au components, the Au/TiO2@C-MM shows enhanced charge-and size-selective adsorption properties, which enables the materials to have high selectivity in the photocatalytic process.

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“…Further, this also caused a lower amount of [bmim]Cl to be degraded by the charge carrier [44]. In addition, the photocatalyst was reported to be agglomerated in acidic conditions, thus reducing the availability of the TiO2 active site that can be used to absorb photons and adsorb [bmim]Cl [45]. From the study, the best working pH for the photodegradation of [bmim]Cl was recorded in alkaline condition at pH 10.…”

Section: Effect Of Extrinsic Factor: Initial Ph Of the [Bmim]cl Solutionmentioning

confidence: 98%

Photodegradation of 1-Butyl-3-methylimidazolium Chloride [Bmim]Cl via Synergistic Effect of Adsorption–Photodegradation of Fe-TiO2/AC

2017

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Ionic liquids (ILs) have attracted interest among researchers due to their tunable properties, which enable them to be used in a wide variety of applications. However, toxicity and biodegradation studies of ILs proved that most of the aromatic ILs, such as imidazolium, are highly toxic and non-biodegradable. Researchers have investigated several advance oxidation processes (AOPs) in order to evaluate the efficiency of the systems used to remove ILs from wastewater. However, their relatively high cost and environmental concerns have limited the application of these AOPs in industry. This research conducted a photocatalytic study using hybrid nanomaterials to evaluate the efficiency of this system as an alternative AOP system for the removal of ILs from wastewater. The synergistic effect of adsorption-photodegradation was introduced by depositing Fe-TiO 2 onto functionalized activated carbon (AC). Nano-TiO 2 was synthesized using the microemulsion method, then modified with a transition metal, and deposited onto oxidized AC. The photodegradation reaction of 1-butyl-3-methylimidazolium chloride [bmim]Cl was then investigated under simulated visible light irradiation. It was observed that the overall efficiency of the system increased with the increasing amount of Fe loading. Our investigation revealed that extrinsic factors such as solution pH, the initial concentration of ILs, and photocatalyst dosage significantly affect the overall efficiency of the system. The optimum condition for the system was observed at pH 10, with initial ILs at 1 mM at 1 g/L of photocatalyst. The best performance photocatalyst was 0.2Fe-TiO 2 /AC.

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Parameters affecting the photocatalytic degradation of dyes using TiO2-based photocatalysts: A review

Cited by 1,664 publications

References 118 publications

Green synthesis of mesoporous anatase TiO₂nanoparticles and their photocatalytic activities

Green synthesis of mesoporous anatase TiO₂nanoparticles and their photocatalytic activities

Carbon coated Au/TiO2 mesoporous microspheres: a novel selective photocatalyst

Photodegradation of 1-Butyl-3-methylimidazolium Chloride [Bmim]Cl via Synergistic Effect of Adsorption–Photodegradation of Fe-TiO2/AC

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Parameters affecting the photocatalytic degradation of dyes using TiO2-based photocatalysts: A review

Cited by 1,664 publications

References 118 publications

Green synthesis of mesoporous anatase TiO2nanoparticles and their photocatalytic activities

Green synthesis of mesoporous anatase TiO2nanoparticles and their photocatalytic activities

Carbon coated Au/TiO2 mesoporous microspheres: a novel selective photocatalyst

Photodegradation of 1-Butyl-3-methylimidazolium Chloride [Bmim]Cl via Synergistic Effect of Adsorption–Photodegradation of Fe-TiO2/AC

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Green synthesis of mesoporous anatase TiO₂nanoparticles and their photocatalytic activities

Green synthesis of mesoporous anatase TiO₂nanoparticles and their photocatalytic activities