Preparation, characterization and application of Nd–TiO2 photocatalyst for the reduction of Cr(VI) under UV light illumination

Selvaraj, Rengaraj; Venkataraj, Selvaraj; Yeon, Jei‐Won; Kim, Younghun; Li, X. Z.; Pang, G.K.H.

doi:10.1016/j.apcatb.2007.07.016

Cited by 196 publications

(95 citation statements)

References 30 publications

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“…due to its high toxicity [6]. In contrast, Cr(III) is much less toxic and vital to plants and human life [7,8]. Therefore, reduction of Cr(VI) to Cr(III) has attracted wide consideration around the world [9].…”

Section: Introductionmentioning

confidence: 99%

Multicycle photocatalytic reduction of Cr(VI) over transparent PVA/TiO2 nanocomposite films under visible light

et al. 2017

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Photocatalytic reduction of hexavalent chromium in wastewater has been widely investigated as an attractive treatment method. In this work, we reported an efficient method for photocatalytic reduction of Cr(VI) over transparent polyvinyl alcohol/titanium dioxide (PVA/TiO2) nanocomposite films under sunlight irradiation. The transparent PVA/TiO2 nanocomposite films were prepared by a simple hydrothermal method combined with a solution casting process. The results revealed that the anatase TiO2 nanoparticles with size less than 10 nm were in-situ generated in PVA matrix, which endowed the films with high transparency. Photocatalytic reduction of Cr(VI) over PVA/TiO2 nanocomposite films exhibited superior visible light photocatalytic activity. Mechanism investigation demonstrated that the PVA acted not only as a transparent support for TiO2 nanoparticles, but also as holes scavengers simultaneously to improve the separation of photogenerated holes and electrons. Meanwhile, the transparent PVA/TiO2 nanocomposite films displayed remarkable stability and excellent recyclability during multicycle Cr(VI) photoreduction. Furthermore, the PVA/TiO2 nanocomposite films showed selective adsorption ability for Cr(III), and thus totally removal of Cr(VI) was achieved after photoreduction process.

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Section: Introductionmentioning

confidence: 99%

Multicycle photocatalytic reduction of Cr(VI) over transparent PVA/TiO2 nanocomposite films under visible light

et al. 2017

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“…The factors and levels used in this work are initial concentration of Cr(VI) ( ) and pH (2 and 4). If factorial design is used, for 2 5 experiments, a total of 32 experiments are needed. It is clear that full factorial design needs more experiments.…”

Section: Resultsmentioning

confidence: 99%

“…Cr(VI) can be removed from aqueous waste by a variety of techniques, such as chemical precipitation, reverse osmosis 8 , ion exchange, foam floatation, electrolysis and adsorption. Most of these methods require high amount of energy or a large amount of chemical substances; therefore, the process of photocatalysis is more effective than the other techniques in this regard 5,10 . In aqueous solutions, the most important chemical species of Cr(VI) in terms of the total concentration and pH are: HCrO 4 -, CrO 4 2-and Cr 2 O 7 2-11 .…”

Section: Introductionmentioning

confidence: 99%

“…TiO 2 has proved to be a promising photocatalyst because of its high photocatalytic activity, non-toxic nature, good stability, and low-cost fabrication 12 . Photocatalytic method is based on the reactive properties of the electron-hole pairs generated in the semiconductor particles under illumination by light whose energy is greater than the semiconductor band gap 5,13 . These charge carriers can reach the surface of the particles and react with the species in solutions with suitable redox potential 1,14 .…”

Section: Introductionmentioning

confidence: 99%

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Specification of the Operational Parameters Contribution in the Efficiency of TiO2-P25 Nanoparticles in the Photocatalytic Removal of Cr(VI) by Taguchi Method

Sabonian¹,

Behnajady²

2014

Orient J Chem

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Chromium exists in environment both as trivalent [Cr(III)] and hexavalent [Cr(VI)] forms. However, hexavalent form is five hundred times more toxic than the trivalent form. Heterogeneous photocatalysis processes, using aqueous suspensions of semiconductors, have received considerable attention in the removal of toxic metals from aqueous media. In this work the nanoparticles of TiO 2 -P25 in the form of slurry were used for photoreduction of Cr(VI) to the less harmful Cr(III). The process has been conducted in different operational conditions such as different initial concentrations of Cr(VI), dosage of photocatalyst, irradiation times, irradiation intensities of light and pH. For the optimization of the process Taguchi experimental design was used. The results of optimization using the Taguchi method, indicated that the pH with 28%, initial concentration of Cr(VI) with 26.99% and dosage of TiO 2 nanocatalyst with 20.53% have the most effects among the selected factors. The intensity of UV light irradiation has the least effect on the efficiency of the process.

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“…Among these pollutants, chromium possesses the most severe environmental concern due to its high toxicity, potential carcinogenicity, and high mobility in water [1,2]. The major sources of chromium pollution are electrochemical, steel manufacturing industries and leather tanning [3,4].…”

Section: Introductionmentioning

confidence: 99%

Effective Photocatalytic Reduction of Cr(VI) by Carbon Modified (CM)-n-TiO2 Nanoparticles under Solar Irradiation

Shaban¹

2013

WJNSE

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Photocatalytic reduction of toxic Cr(VI) was successfully achieved using carbon modified titanium oxide (CM-n-TiO 2 ) nanoparticles under natural sunlight illumination. Modification of titanium oxide by carbon significantly enhanced the photocatalytic reduction of Cr(VI) under natural sunlight irradiation. The effects of various experimental parameters such as catalyst dose, initial concentration of Cr(VI), and solution pH on the reduction rate of Cr(VI) were investigated. The highest reduction rate of Cr(VI) was obtained at the optimal conditions of pH 5 and 2.0 g·L −1 of CM-n-TiO 2 . Interestingly, in the presence of phenol, as a sacrificial electron donor, the rate of Cr(VI) reduction was nearly 1.7 times higher than in its absence. The solar photoreduction of Cr(VI) in aqueous solution using CM-n-TiO 2 obeyed a pseudo-first order kinetics according to the Langmuir-Hinshelwood model.

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Preparation, characterization and application of Nd–TiO2 photocatalyst for the reduction of Cr(VI) under UV light illumination

Cited by 196 publications

References 30 publications

Multicycle photocatalytic reduction of Cr(VI) over transparent PVA/TiO2 nanocomposite films under visible light

Multicycle photocatalytic reduction of Cr(VI) over transparent PVA/TiO2 nanocomposite films under visible light

Specification of the Operational Parameters Contribution in the Efficiency of TiO2-P25 Nanoparticles in the Photocatalytic Removal of Cr(VI) by Taguchi Method

Effective Photocatalytic Reduction of Cr(VI) by Carbon Modified (CM)-n-TiO2 Nanoparticles under Solar Irradiation

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