Photocatalytic removal of Cr(VI) and Ni(II) by UV/TiO2: kinetic study

Siboni, M Shirzad; Samadi, M T; Yang, Jae‐Kyu; Lee, Seung‐Mok

doi:10.5004/dwt.2012.2586

Cited by 20 publications

(8 citation statements)

References 37 publications

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“…Therefore, indirect reduction of adsorbed Cr(VI) ions is possible by getting the electrons from Ti 3+ of TiO 2 surface (Eqs. (7) and (8)) [29]. The important efficiency of the first three additives (tartaric acid, oxalic acid, and EDTA) may be explained by the presence of carboxylic group in their structures which is able to form complexes with TiO 2 as an anchor species.…”

Section: Effect Of Hole Scavengersmentioning

confidence: 96%

Photoreduction of toxic chromium using TiO₂-immobilized under natural sunlight: effects of some hole scavengers and process parameters

Djellabi

Ghorab

2014

Desalination and Water Treatment

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A B S T R A C TThis work focuses on the photocatalytic reduction of Cr(VI)-Cr(III) using TiO 2 -immobilized onto glass slides under natural sunlight. The commercial TiO 2 Degussa P25 was used as a photocatalyst in this work. The effects of some additives as hole scavengers for Cr(VI) reduction are studied. The results show that their presence enhances the reduction rate in the order: tartaric acid > oxalic acid > EDTA > ethanol > methanol > no-additive. The optimization of tartaric acid concentration is determined. The effect of process parameters such as Cr(VI) concentration, pH, and the presence of interfering substances such as inorganic anions (SO 2À 4 , CO 2À 3 , NO À 3 , Cl À and PO 3À 4 ) and metallic cations (Fe 3þ , Cu 2þ , Zn 2þ , and Mn 2þ ) is investigated. The results show that the removal rate is maximum at pH 1.5. On the other hand, the coexistence of interfering ions with Cr(VI) decreases the reduction rate except for the Fe 3þ . Finally, the results show that the TiO 2 -immobilized can be reused several times.

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Section: Effect Of Hole Scavengersmentioning

confidence: 96%

Photoreduction of toxic chromium using TiO₂-immobilized under natural sunlight: effects of some hole scavengers and process parameters

Djellabi

Ghorab

2014

Desalination and Water Treatment

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“…Reaction (16) is predominant at acidic pH, while reaction (17) is predominant at neutral pH, and reaction (18) is under basic conditions [67]. The produced Cr 3+ can then foul the titanium surface as described above.…”

Section: Chromiummentioning

confidence: 97%

Fouling and Inactivation of Titanium Dioxide-Based Photocatalytic Systems

Katz

McDonagh

Tijing

et al. 2015

Critical Reviews in Environmental Science and Technology

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Titanium dioxide is an effective photocatalyst for the breakdown of many environmental contaminants. The complex mixtures that can occur in water matrices can significantly affect the breakdown of the contaminants in water by titanium dioxide (TiO 2). In this paper, we 15 discuss a wide variety of foulants and inhibitors of photocatalytic TiO 2 systems and review different methods that can be effective for their fouling prevention. Approaches to regenerate a fouled or contaminated TiO 2 catalysts are exploredand the effect of substrates on immobilized titanium dioxide is also reviewed.

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“…According to the literature, ions of Cr(VI) are more toxic than Cr(III) ions, thus, more dangerous to the environment and health of living organisms; therefore, reduction of Cr(VI) to Cr(III) ions could be a suitable strategy for reducing the risks of Cr(VI) ions and easy separation of this ion from water. Given solubility of Cr(VI) ions in water, it is difficult to remove them from water whereas Cr(III) ions can be easily precipitated by alkalizing the solution and separated in solid sludge form [ 26,27].…”

Section: Introductionmentioning

confidence: 99%

Low-cost, simple and eco-friendly biosynthesis of CeO2-NPs using extract of Pelargonium hortorum for the photocatalytic and antioxidant applications

Mahabadi

Mirzakhani

Azizi

et al. 2021

Preprint

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In this paper, firstly the phytochemical composition in the aqueous extract of Pelargonium, growing wildly in the center of Iran, was studied. Folin–Ciocalteu and Aluminum chloride methods and the GC/MS technique were used to determine the total phenolic, flavonoid contents, and volatile constituents in the extract, respectively. The amounts of the total phenolic and flavonoid contents in the extract were found to be 136.5 mg GA/g and 63.9 mg RU/g, respectively. Twenty-one compounds, representing 15 (about 80.0%) of the total volatile constituents were identified. The main components of the volatile constituent were α-pinene (25.28%) and fenchyl acetate (20.63%). Secondly, a fast, simple, and eco-friendly biosynthesis of cerium oxide nanoparticles (CeO2-NPs) were investigated using the extract of Pelargonium as a natural reducing and stabilizing agent. Several advance techniques such as Ultraviolet-Visible (UV–Vis) spectroscopy, X-ray diffraction (XRD), Scanning electron microcopy (FESEM), Dynamic light scattering (DLS), and Brunaure Emmett-Teller (BET) were used for the analysis and characterization of the synthesized nanoparticles. The results of the characterization analysis showed that the prepared nanoparticles were spherical in shape, with an average size of 28 nm and zeta potential of -25.8 mV, and had 33.84 m2/g BET surface area, 9.31 nm mane diameter pore, and a total pore volume of 0.078 cm3/g. Finally, the practical applications including the antioxidant and photocatalyst activity of the biosynthesized CeO2-NPs were evaluated. An analysis of antioxidant and catalytic activities showed that the biosynthesized CeO2-NPs have a good ability of scavenging of 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical with the IC50 value of 42.7 µg/mL and also good reduction ability of hexavalent chromium {Cr(VI)} ions with a reduction efficiency of 94% in an aqueous solution containing 10 mg/L of Cr(VI) of ion with natural pH of 5.5 and CeO2-NPs dose of 200 mg/L during 60 min.

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Photocatalytic removal of Cr(VI) and Ni(II) by UV/TiO2: kinetic study

Cited by 20 publications

References 37 publications

Photoreduction of toxic chromium using TiO₂-immobilized under natural sunlight: effects of some hole scavengers and process parameters

Photoreduction of toxic chromium using TiO₂-immobilized under natural sunlight: effects of some hole scavengers and process parameters

Fouling and Inactivation of Titanium Dioxide-Based Photocatalytic Systems

Low-cost, simple and eco-friendly biosynthesis of CeO2-NPs using extract of Pelargonium hortorum for the photocatalytic and antioxidant applications

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Photocatalytic removal of Cr(VI) and Ni(II) by UV/TiO2: kinetic study

Cited by 20 publications

References 37 publications

Photoreduction of toxic chromium using TiO2-immobilized under natural sunlight: effects of some hole scavengers and process parameters

Photoreduction of toxic chromium using TiO2-immobilized under natural sunlight: effects of some hole scavengers and process parameters

Fouling and Inactivation of Titanium Dioxide-Based Photocatalytic Systems

Low-cost, simple and eco-friendly biosynthesis of CeO2-NPs using extract of Pelargonium hortorum for the photocatalytic and antioxidant applications

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Product

Resources

About

Photoreduction of toxic chromium using TiO₂-immobilized under natural sunlight: effects of some hole scavengers and process parameters

Photoreduction of toxic chromium using TiO₂-immobilized under natural sunlight: effects of some hole scavengers and process parameters