Cr(VI) photocatalytic reduction under sunlight followed by Cr(III) extraction from TiO 2 surface

Djellabi, Ridha; Ghorab, Fouzi M.; Nouacer, Sana; Smara, Abdelaziz; Khireddine, Ouahida

doi:10.1016/j.matlet.2016.04.090

Cited by 82 publications

(12 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Photoreduction of Pd(II) over TiO 2 for the doping purpose is performed by the irradiation of PdCl 2 in the aqueous solution with UV light [14]. The reduction of Pd(II) ion is written as reaction (19) that yields small Pd particles on TiO 2 structure:…”

Section: Photoreduction Methods Over Tio 2 For Metal Recovery and Dopimentioning

confidence: 99%

“…Hence, detoxification of the toxic Cr(VI) can be carried out by reduction method. Photoreduction of Cr(VI) over TiO 2 photocatalyst has been frequently reported [18][19][20][21][22][23] with satisfaction result. Further, the Cr 3+ ions can precipitate into undissolved Cr(OH) 3 in basic condition that is remediable by solidification/stabilization technique:…”

Section: Photocatalysts -Applications and Attributesmentioning

confidence: 96%

“…This is a reduction path. The use of the electrons from TiO 2 for some reducible metal ions such as Ag(I) [5][6][7][8][9][10][11][12][13], Au(III) [13][14][15][16][17], Cr(VI) [18][19][20][21][22][23], Cu (II) [24][25][26], Hg(II) [27,28], and U(VI) [29,30] has also been developed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photoreduction Processes over TiO2 Photocatalyst

Wahyuni¹,

Aprilita²

2019

Photocatalysts - Applications and Attributes

View full text Add to dashboard Cite

This chapter presents the study of TiO 2 photocatalyst for the photoreduction of several reducible chemicals. The photocatalytic reduction of several toxic metal ions, including Ag (I), Cu(II), Cr(VI), Hg(II), and U(VI) in the presence of TiO 2 , in order to decrease their toxicity, is described. Photodeposition of the noble metals, such as Ag(I), Au(III), Pt(IV), and Pd(II) for doping purposes by photocatalytic reduction over TiO 2 , is also addressed. Conversion of the greenhouse gas of CO 2 into useful hydrocarbons and methanol by photocatalytic reduction using TiO 2 photocatalyst is highlighted. Several operating parameters in photoreduction processes that are photocatalyst dose, time of the irradiation, pH of the solution, and the initial concentration of the substrates (the reducible chemicals) are also reviewed.

show abstract

Section: Photoreduction Methods Over Tio 2 For Metal Recovery and Dopimentioning

confidence: 99%

Section: Photocatalysts -Applications and Attributesmentioning

confidence: 96%

See 1 more Smart Citation

Photoreduction Processes over TiO2 Photocatalyst

Wahyuni¹,

Aprilita²

2019

Photocatalysts - Applications and Attributes

View full text Add to dashboard Cite

show abstract

“…in which titanium dioxide pohotocatalysts were employed. After 2 hours, 39.75% of chromium (III) was observed in the form of sedimentation on surface of TiO2, 60.25% of that was observed in the solution [21].…”

Section: Satyro Et Al Investigated (Ethylenediamine-disuccinic Acidsmentioning

confidence: 99%

An Experimental Study on the Simultaneous Phenol and Chromium Removal From Water Using Titanium Dioxide Photocatalyst

2018

View full text Add to dashboard Cite

Organic pollutants along with heavy metals and organic metal compounds may cause abnormal changes in physical and chemical parameters (acidity, alkalinity, salinity, color, smell and taste) of aquatic ecosystems and are among the serious threats of environmental health, especially the water resources. In this study, the effect of titanium dioxide photocatalyst with different concentrations (50, 100, 200, 500 and 1000 mg/l) on the simultaneous removal of phenol and heavy metal (chromium) from aqueous solution of the closed system was investigated. In order to determine the optimal concentrations of photocatalyst, all the tests were conducted in pH =7, using ultraviolet light with 100 watt power. The highest rate of phenol and chromium removal was observed at concentration of 100 mg/ml which was equal to 72.3% and 67.2%, respectively. Study of the reaction kinetics showed that the reactions of phenol and chromium removal were zero and first-order, respectively.

show abstract

“…During the visible light irradiation, about 4 mL of the suspensions was taken from the reactor at given time intervals, and then being centrifuged at the speed of 12000 r min -1 for 10 min to remove the solid photocatalyst. The concentrations of phenol was measured with a SHIMADZU SPD-M20A high-performance liquid chromatograph (HPLC).The concentration of Cr 6+ was determined using the diphenylcarbazide (DPC) method according to previous literature by measuring the absorption wavelength of 540 nm using an UV−vis spectrometer [12].…”

Section: Photocatalytic Activity Evaluationmentioning

confidence: 99%