Scientists Say Egg Shells Remove Hex Chrome from Water 24.
October 2011 Scientists in China have developed an absorbent
material made from waste eggshell membrane that can remove
hexavalent chromium from contaminated water. Current methods for
removal include reduction, ion exchange and absorption.
Biosorption is a type of absorption that uses a material that is
not man-made, usually some kind of waste material. But
scientists Yuming Huang and Bin Liu from Southwest University,
Chongqing, have designed a new biosorbent using eggshells. “As
the by-product of food processing and manufacturing
plants,eggshells represent a significant waste because they are
traditionally useless after the production of eggs and egg
derivatives,” says Huang. “Using this waste to produce useful
biomaterial for removal of Cr6 from water may be a good choice
and opens up a pathway to using biowaste to treat toxic metals
from water.' Most biosorbents contain amine groups that remove
the heavy metals through chelating cationic metal io