Photocatalytic magnetic separable beads for chromium (VI) reduction

被引：100

作者：

Idris, Ani ^{[1
]}

Hassan, Nursia ^{[1
]}

Ismail, Nur Suriani Mohd ^{[1
]}

Misran, Effaliza ^{[1
]}

Yusof, Noordin Mohd ^{[2
]}

Ngomsik, Audrey-Flore ^{[3
]}

Bee, Agnes ^{[4
]}

机构：

[1] Univ Teknol Malaysia, Fac Chem & Nat Resource Engn, Dept Bioproc Engn, Skudai 81310, Johor, Malaysia

[2] Univ Teknol Malaysia, Fac Mech Engn, Dept Mfg & Ind Engn, Skudai 81310, Johor, Malaysia

[3] Queens Univ Belfast, QUILL, Belfast BT9 5AG, Antrim, North Ireland

[4] Univ Paris 06, CNRS, UMR 7612, F-75252 Paris, France

来源：

WATER RESEARCH | 2010年 / 44卷 / 06期

关键词：

Photocatalyst; Magnetic photocatalyst beads; Magnetic particles; Maghemite; Wastewater treatment; Solid-liquid separation; WASTE-WATER; METAL-IONS; CR(VI); NANOPARTICLES; REMOVAL;

D O I：

10.1016/j.watres.2009.11.026

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Magnetically separable photocatalyst beads containing nano-sized iron oxide in alginate polymer were prepared. This magnetic photocatalyst beads are used in slurry-type reactors. The magnetism of the catalyst arises from the nanostructured particles gamma-Fe(2)O(3), by which the catalyst can be easily recovered by the application of an external magnetic field. These synthesized beads are sunlight-driven photocatalyst. In the system without magnetic photocatalyst beads, no chromium reduction was observed under sunlight irradiation due to the stability of the chromium (VI). Upon the addition of magnetic photocatalyst beads, the photo-reduction of Cr(VI) was completed in just after only 50 min under sunlight irradiation due to the photocatalytic activity of the beads. However when placed away from sunlight, the reduction rate of the chromium is just about 10%. These observations were explained in terms of absorption occurrence of chromium (VI) onto the catalyst surface which took place in this reaction. In addition, photo-reduction rate of chromium (VI) was more significant at lower pH. The results suggest that the use of magnetic separable photocatalyst beads is a feasible strategy for eliminating Cr(VI). (C) 2009 Elsevier Ltd. All rights reserved

引用

页码：1683 / 1688

页数：6

共 18 条

[11] Monodisperse magnetic nanoparticles: Preparation and dispersion in water and oils [J].