Title :
Influence of Low Molecular Weight Organic Carboxylic Acids on Cr (VI) Photo-Reduction in Montmorillonite Suspensions
Author :
Liu, Yanxiang ; Guo, Li ; Wu, Feng ; Deng, Nansheng
Author_Institution :
Sch. of Chem. & Environ. Eng., Jianghan Univ., Wuhan, China
Abstract :
Chromium is an environmental contaminant of global concern. This study focuses on the reduction of Cr (VI) using montmorillonite in the presence of organic carboxylic acids under UV-vis irradiation. The Cr (VI) reduction rate can be greatly accelerated when low-molecular-weight organic acid is present. This process of photoreduction follows approximately zero order kinetics. The effects of pH values on the reduction efficiency are also investigated. The photoreduction efficiency of chromium is higher under acidic pH than that of in the weakly alkaline pH. The photoreduction efficiency of Cr (VI) is found to increase with concentrations of organic carboxylic acids and montmorillonite. However, the reaction is independent of Cr (VI) concentration.
Keywords :
organic compounds; photochemistry; reduction (chemical); suspensions; ultraviolet radiation effects; UV-vis irradiation; environmental contaminant; molecular weight; montmorillonite; organic carboxylic acids; photoreduction; suspensions; Chemical engineering; Chromium; Ecosystems; Electrostatics; Minerals; Organic chemicals; Organic compounds; Oxidation; Soil; Suspensions;
Conference_Titel :
Bioinformatics and Biomedical Engineering , 2009. ICBBE 2009. 3rd International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2901-1
Electronic_ISBN :
978-1-4244-2902-8
DOI :
10.1109/ICBBE.2009.5162962
