Photocatalytic reduction of mercury(II) and simultaneous oxidative degradation of surfactants in titanium dioxide suspensions | Health & Environmental Research Online (HERO)

Health & Environmental Research Online (HERO)

Print Feedback Export to File

This record has one attached file:

Citation
Tags

HERO ID

4192924

Reference Type

Book/Book Chapter

Title

Photocatalytic reduction of mercury(II) and simultaneous oxidative degradation of surfactants in titanium dioxide suspensions

Author(s)

Hegyi, J; Horvath, O

Year

2004

Book Title

PROGRESS IN COLLOID AND POLYMER SCIENCE

Volume

125

Page Numbers

10-16

DOI

10.1007/b13457

Web of Science Id

WOS:000227151000002

Abstract

Anionic dodecyl sulfate (DS-) surfactant proved to be an efficient hole scavenger in the TiO2-mediated photocatalytic reduction of Hg(II) in aqueous solution. oxygen did not affect the efficiency of mercury deposition in this system, chloride ions strongly hindered it, owing to the formation of anionic chloromercurate(II) complexes. pH significantly influenced the reduction of Hg(II): an increase of pH in the range 4.5-6.8 enhanced the efficiency. The presence of Hg(II) considerably accelerated the oxidative degradation of dodecyl sulfate. This reaction was moderately promoted upon increasing the pH; thus, a neutral or a slightly basic reaction mixture was most suitable for simultaneous removal of Hg(II) and DS-. Cationic cetyltrimethylammonium (CTA(+)) detergent also acted as a hole scavenger but less efficiently than DS-. Its photocatalytic degradation, however, was hindered by Hg(II).

Keywords

photocatalysis; titanium dioxide; mercury; surfactants; decontamination