Effect of alkaline-doped TiO2 on photocatalytic efficiency

Bessekhouad, Y.; Robert, Didier; Weber, J.V.; Chaoui, N.

doi:10.1016/j.jphotochem.2003.12.001

Cited by 196 publications

(91 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They are also different to those reported by Bessekhouad et al, [23] who showed that, depending on the preparation technique, Lidoped TiO 2 shows two contradictory behaviors. For the catalyst prepared by sol-gel route, the presence of Li reduces the catalyst photoactivity.…”

Section: Repeated Use Of the Photocatalystcontrasting

confidence: 99%

“…These authors showed that doping TiO 2 with Li + , Zn 2+ or Cd 2+ improves the photoactivity of TiO 2 with the maximum effect of Li + in the case of phenol photodecomposition. Y. Bessekhouad et al [23] investigated the doping effect of alkaline (Li, Na, K) cation on the photocatalytic activity of TiO 2 under Xenon lamp excitation, and in the presence of three models of pollutants, viz. malachite green oxalate, 4-hydroxybenzoic acid and benzamide.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Li‐doped nanosized TiO₂ powder with enhanced photocalatylic acivity under sunlight irradiation

Bouattour

Kallel

Rego

et al. 2010

Applied Organom Chemis

View full text Add to dashboard Cite

dThis work reports on the synthesis of Li-doped TiO 2 nanoparticles using the sol-gel process and solid-state sintering, and investigates their potential use as a photocatalyst for degradation under sunlight excitation of different organic model compounds in aqueous solution. The structure of the nanocrystals was examined by X-ray diffraction, UV-vis ground state diffuse reflectance absorption spectra and X-ray photoelectron emission spectroscopy. Results showed that samples prepared by sol-gel process and calcined at 400• C are composed of a mixture of anatase and rutile phases, in contrast to the one prepared by solid-state sintering, which exhibits an anatase phase with Li being involved in a spinel phase. The photocatalytic degradation of aqueous solutions of different aromatic compounds was successfully achieved under sunlight excitation in presence of Li-doped TiO 2 prepared via sol-gel process. It was shown that the calcination temperature and the preparation mode greatly affect the photocatalytic efficiency.

show abstract

Section: Repeated Use Of the Photocatalystcontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Li‐doped nanosized TiO₂ powder with enhanced photocalatylic acivity under sunlight irradiation

Bouattour

Kallel

Rego

et al. 2010

Applied Organom Chemis

View full text Add to dashboard Cite

show abstract

“…The pH of the point of zero charge pH pzc was measured by pH drift method (Bessekhouad et al 2004;Saleh and Gupta 2011). The method followed to determine the PZC of the TiO 2 comprised of the following steps.…”

Section: Characterization Of Tio 2 Samplesmentioning

confidence: 99%

Photocatalytic activity evaluation of TiO2 nanoparticles based on COD analyses for water treatment applications: a standardization attempt

EL-Mekkawi

Galal

Wahab

et al. 2016

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

Evaluation of the photocatalytic activities of TiO 2 nanomaterials based on the chemical oxygen demand (COD) analyses under identical experimental conditions was not previously reported. In this work, COD has been selected as an adequate industrial water quality measure toward the establishment of a representative standard test method. The initial COD values of six organic pollutants representing dye, surfactants, phenols and alcohol were set at 30 ± 2 mg/L. Ten of different commercial and synthesized TiO 2 samples representing anatase, rutile and mixed phases were used and characterized. The data of photocatalytic processes were compared to that obtained using the commonly widespread Degussa-P25 TiO 2 (TD). The COD of all pollutants was completely removed by TD at UV exposure dose B9.36 mWh/cm 2 . Consequently, the maximum irradiation dose was set at this value in all experiments. The percentages of COD removal as well as the values of the accumulated UV doses required for complete removal of pollutants were measured using the different TiO 2 samples. TiO 2 samples show different performance abilities toward the various pollutants compared to TD. Based on the obtained data, TiO 2 photocatalysts were divided into two categories according to the hydroxyl radical formation rates. Comparison with previous studies reveals that the photocatalytic efficiency evaluation depends on the method of measurement. COD is recommended to be used as an adequate technique of analysis that meets the purpose of water treatment applications.

show abstract

“…TiO2 can utilize only about 3.0% of the solar light reaching the earth surface for decomposition of organic compounds (Chen et al, 2005). The efficient use of sun light became an appealing challenge for developing photoccatalysts (Hilal et al, 2007 andBessekhouad et al, 2004). One approach to solve the above problems is to sensitize TiO2 and ZnO by using narrow band gap semi-conductors with higher conduction band.…”

Section: Introductionmentioning

confidence: 99%

Photo-catalytic Removal of Methyl Orange Dye by Polyaniline Modified ZnO using Visible Radiation

Melaku¹,

Yadav²,

Kebede³

2014

Sci. Technol. Arts Res. J.

View full text Add to dashboard Cite

Article InformationPolyaniline modified zinc oxide (PANI/ZnO) nanocomposite was synthesized by in-situ polymerization process. The as-synthesized nano-ZnO, PANI and PANI/ZnO nanocomposite were characterized by X-ray diffraction (XRD), FT-IR, and UV-Vis spectroscopy. The UV-visible spectroscopy studies showed that the absorption peak for PANI/ZnO nanocomposite has a red shift toward visible wavelengths compared with the ZnO nanoparticles and PANI. Photocatalytic efficiency of PANI/ZnO nanocomposite was investigated for the degradation of methyl orange (MeO) dye as a model organic compound under Visible light irradiation. The photocatalytic activities of ZnO, PANI and PANI/ZnO nanocomposite were studied. The results showed that ZnO/PANI nanocomposite had greater photocatalytic activity than ZnO nanoparticles and PANI under visible light irradiation. According to these results, application of PANI as a shell on the surface of ZnO nanoparticles causes the enhanced photocatalytic activity of the PANI/ZnO nanocomposite. Influence of some operational parameters such as: amount of photocatalyst, pH of solution, and MeO dye initial concentration on the photodegradation reaction rate was investigated.The optimum values of pH and catalyst dose found to be 6 and 1.50 gmL -1 respectively. It was demonstrated that the photocatalytic degradation of MeO follows pseudo first-order kinetics. The PANI/ZnO nanocomposite photocatalysts have good photocatalytic stability and can be reused three times with only gradual loss of activity. Thus, the PANI/ZnO nanocomposites are efficient photocatalytic materials for degrading contaminated colored wastewater for reuse in textile industries under mild conditions.

show abstract

Effect of alkaline-doped TiO2 on photocatalytic efficiency

Cited by 196 publications

References 15 publications

Li‐doped nanosized TiO₂ powder with enhanced photocalatylic acivity under sunlight irradiation

Li‐doped nanosized TiO₂ powder with enhanced photocalatylic acivity under sunlight irradiation

Photocatalytic activity evaluation of TiO2 nanoparticles based on COD analyses for water treatment applications: a standardization attempt

Photo-catalytic Removal of Methyl Orange Dye by Polyaniline Modified ZnO using Visible Radiation

Contact Info

Product

Resources

About

Effect of alkaline-doped TiO2 on photocatalytic efficiency

Cited by 196 publications

References 15 publications

Li‐doped nanosized TiO2 powder with enhanced photocalatylic acivity under sunlight irradiation

Li‐doped nanosized TiO2 powder with enhanced photocalatylic acivity under sunlight irradiation

Photocatalytic activity evaluation of TiO2 nanoparticles based on COD analyses for water treatment applications: a standardization attempt

Photo-catalytic Removal of Methyl Orange Dye by Polyaniline Modified ZnO using Visible Radiation

Contact Info

Product

Resources

About

Li‐doped nanosized TiO₂ powder with enhanced photocalatylic acivity under sunlight irradiation

Li‐doped nanosized TiO₂ powder with enhanced photocalatylic acivity under sunlight irradiation