标题：Simultaneous Purification and Desalination of Water using Biodegradable Natural Polymers: A Kinetic Study of Reduction of Toxic Soluble Carcinogen Chromium (VI) to Removable Insoluble Chromium (III) Complexes with formation of Coordination Biopolymer Precursors for Removal of Undesired Poisonous Heavy Metal Ions From Wastewater
期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2016
卷号：5
期号：8
页码：15522
DOI：10.15680/IJIRSET.2016.0508154
出版社：S&S Publications
摘要：The high toxicity of chromate anion and the suspected carcinogen and mutagen symptoms makes thechemistry of chromium (VI) in biological systems very important for biochemists and chemists. It is well establishedthat reduction of chromium from toxic soluble Cr(VI) to insoluble Cr(III) complexes can be treated by a multiplicity ofreaction techniques depending on the nature of the reducing agent and the reaction conditions. Unfortunately,techniques which are available in the markets still remained expensive and of low efficiency. Therefore pectin asbiodegradable, safety, non-expensive natural polymer can be used as a strong reducing agent of toxic Cr(VI) forsimultaneous removal of poisonous heavy metal ions and cleaning up the soluble toxic chromium (VI) fromwastewater. This new technique has emerged as a new promising and pervasive in future technological industry.Moreover, the formed diketo-pectate as coordination biopolymeric oxidation precursor was found to possess highaffinity for chelation with the Cr(III) formed as well as with polyvalent metal ions existed in the solution. Hence, thisoxidation product can be used as a chelating agent for removal of toxic and undesired heavy metal ions fromcontaminated matters such as in water, soil or environment. The reduction kinetics of chromic acid by pectin (PEC) inaqueous solutions has been investigated, spectrophotometrically. A kinetic evidence for formation of 1:1 coordinationbiopolymer intermediate complexes between pectin and Cr (VI) was revealed. The route and nature of electron-transferin the rate-determining step has been examined and discussed. The kinetic parameters have been evaluated and atentative reaction mechanism consistent with the kinetic results obtained is discussed.
