Cr(VI) photocatalytic reduction under sunlight followed by Cr(III) extraction from TiO2 surface

被引：80

作者：

Djellabi, Ridha ^{[1
]}

Ghorab, Fouzi M. ^{[1
]}

Nouacer, Sana ^{[1
]}

Smara, Abdelaziz ^{[1
]}

Khireddine, Ouahida ^{[1
]}

机构：

[1] Badji Mokhtar Univ, Dept Chem, Lab Water Treatment & Valorizat Ind Wastes, Fac Sci, BP12 2300, Annaba, Algeria

来源：

MATERIALS LETTERS | 2016年 / 176卷

关键词：

Chromium; Reduction; Deposition; Solar light; Extraction; TiO2; surface; HETEROGENEOUS PHOTOCATALYSIS; HOLE SCAVENGERS; REMOVAL; PHOTOREDUCTION;

D O I：

10.1016/j.matlet.2016.04.090

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The main objective of this work was the extraction of Cr(III) from TiO2 surface deposited after Cr(VI) reduction by TiO2 solar photocatalysis. The results show that the reduction of Cr(VI) to Cr(III) by TiO2 under natural sunlight is total after 2 h using tartaric acid (A.T) as a hole scavenger under the following conditions: [Cr(VI)]: 20 ppm, [TiO2]: 2 g/L, [A.T]: 60 ppm and pH: 2.2. The produced Cr(III) is divided between deposited onto TiO2 surface (39.75%) and in the solution (60.25%). The Cr(III) removal from TiO2 surface by the sequential extraction after three washing were 90.13% and 42.62% using citric acid and EDTA respectively. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：106 / 109

页数：4

共 21 条

[1] A review of chemical, electrochemical and biological methods for aqueous Cr(VI) reduction [J].

Barrera-Diaz, Carlos E. ;

Lugo-Lugo, Violeta ;

Bilyeu, Bryan .

JOURNAL OF HAZARDOUS MATERIALS, 2012, 223 :1-12

[2]

Benjamin M.M., 2002, WATER CHEM

[3] Environmental chemistry - Tracking hexavalent Cr in groundwater [J].

Blowes, D .

SCIENCE, 2002, 295 (5562) :2024-2025

[4] Nano-titania assisted photoreduction of Cr(VI) The role of the different TiO2 polymorphs [J].

Cappelletti, G. ;

Bianchi, C. L. ;

Ardizzone, S. .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2008, 78 (3-4) :193-201

[5] Photo-reduction of hexavalent chromium in aqueous solution in the presence of zinc oxide as semiconductor catalyst [J].

Chakrabarti, Sampa ;

Chaudhuri, Basab ;

Bhattacharjee, Sekhar ;

Ray, Ajay K. ;

Dutta, Binay K. .

CHEMICAL ENGINEERING JOURNAL, 2009, 153 (1-3) :86-93

[6] Photocatalytic deactivation of commercial TiO2 samples during simultaneous photoreduction of Cr(VI) and photooxidation of salicylic acid [J].

Colón, G ;

Hidalgo, MC ;

Navío, JA .

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 2001, 138 (01) :79-85

[7] Equilibrium and dynamic study on hexavalent chromium adsorption onto activated carbon [J].

Di Natale, F. ;

Erto, A. ;

Lancia, A. ;

Musrnarra, D. .

JOURNAL OF HAZARDOUS MATERIALS, 2015, 281 :47-55

[8] Photoreduction of toxic chromium using TiO2-immobilized under natural sunlight: effects of some hole scavengers and process parameters [J].

Djellabi, R. ;

Ghorab, M. F. .

DESALINATION AND WATER TREATMENT, 2015, 55 (07) :1900-1907

[9] Heterogeneous photocatalysis: fundamentals and applications to the removal of various types of aqueous pollutants [J].

Herrmann, JM .

CATALYSIS TODAY, 1999, 53 (01) :115-129

[10] Comparative study of various magnetic nanoparticles for Cr(VI) removal [J].

Hu, Jing ;

Lo, Irene M. C. ;

Chen, Guohua .

SEPARATION AND PURIFICATION TECHNOLOGY, 2007, 56 (03) :249-256

← 1 2 3 →