Utilization of Cr (VI) by composites cellulose/polyaniline
Purification of water from heavy metals and chromium is one of the important areas of modern research. It is known that Cr (VI) is 500 times more toxic than Cr (III) and may be present in natural reservoirs of water in the form of oxyanions, such as (Cr2O7 2– , HCrO4 – and CrO4 2- ), formed due to the high electrostatic repulsion force between these ions and negatively charged ground particles. The main sources of chromium water pollution are wastewater from many industrial extractions, processing of chromium-containing ores, galvanic wastewater, leather processing, production of paints and wood preservatives, etc. All these sources are anthropogenic and related to human activities.