Fluorescent light induced Cr(VI) reduction by citrate in the presence of TiO2 and ferric ions
Journal
Colloids and Surfaces A: Physicochemical and Engineering Aspects
Journal Volume
253
Journal Volume
253
Journal Issue
1-3
Journal Issue
1-3
Pages
15-22
Start Page
15
End Page
22
ISSN
09277757
Date Issued
2005-02-01
Author(s)
Abstract
Utilization of inorganic reducing agents, such as Fe(II) and sulfide for Cr(VI) reduction would result in an increase in solid waste production and subsequent treatment cost. Rapid decrease in Cr(VI) concentrations and less solid by-products are valuable in the remediation of Cr(VI) contamination. The enhancement of Cr(VI) reduction by organic compounds with activated surfaces allows us not only efficient uses of natural materials but also decrease of processing products. The experiments of this work were all conducted under the light in visible wavelength region. Titanium dioxides (TiO2) could accelerate Cr(VI) reduction by citrate; however, illumination was necessary to initiate the redox reaction. Although Fe(III) did not show any capability of reducing Cr(VI), it could increase the removal of Cr(VI) by TiO2 in the presence of citrate and fluorescent light. When develop remediation techniques for Cr(VI) contamination, natural sunlight or a cheaper light source (i.e., fluorescent light) can be used, instead of UV light which is often used in the current techniques of treatments of soil and water contamination.
Subjects
Citrate
Cr(VI) reduction
Fe(III)
Fluorescent light
TiO2
Other Subjects
Byproducts; Concentration (process); Contamination; Fluorescence; Redox reactions; Remediation; Removal; Soils; Titanium dioxide; Water pollution; Activated surfaces; Fluorescent light; Inorganic reducing agents; Water contamination; Chromium compounds; chromium; citric acid; ferric ion; organic compound; sulfide; titanium dioxide; article; bioremediation; concentration response; degradation kinetics; fluorescence analysis; illumination; molecular dynamics; molecular interaction; oxidation reduction reaction; priority journal; reaction analysis; reduction kinetics; reliability; solid waste; solid waste management; sunlight; surface property; technique; ultraviolet radiation
Publisher
Elsevier
Type
journal article