Modified Starch–Enhanced Ultrafiltration for Chromium (VI) Removal

Abstract

Abstract-With increasing concerns about environmental protection are being made to develop biodegradable starch-based materials using in pollutant treatment, particularly for heavy metals removal. This study was investigated on two cross-linkages of modified starch including amino and carboxyl as the sorbents to remove hexavalent chromium from aqueous solution. The overall resulted showed that only amino crosslinking starch was effective on Cr (VI) chemisorption. The carboxyl crosslinking and non-modified starch were showed too poor adsorption performances. The pH of the aqueous solutions is an important controlling parameter in the heavy metal adsorption processes. The highest efficiency was achieved in acidic condition about pH 5. However, modified starch is an organic material so it can be contaminated in the effluent. The ultrafiltration was used to separate modified starch from the effluent for sufficiently treatment. Also the operating conditions of modified starch enhanced ultrafiltration for chromium (VI) removal were evaluated in this study.Index Terms-Modified starch, chemisorptions, heavy metal removal.