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Indian Institute of Technology (IIT) Roorkee 
A hybrid iron sulfide impregnated anion exchanger (HISIIX) for selective removal of hexavalent chromium from contaminated water 
Sudipta Sarkar and Laiju A.R 
Indian Institute of Technology (IIT) Roorkee 
Application type:
Applied - 2019-06-19 
Application Number:
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Indian Institute of Technology (IIT) Roorkee 
Present invention provides synthesis of hybrid Iron Sulfide Impregnated Anion Exchanger (HISIIX) for selective removal of hexavalent chromium from contaminated water. Anion exchange resin containing styrene-divinyl benzene matrix and quaternary ammonium functional group are kept in contact with 0.3M Na2S solution in an orbital shaking incubator for 24 hour. After 24 hour, the ion exchanger is separated and washed thoroughly with distilled water before it was contacted with FeCl2 in an orbital shaker. The resultant material is black in colour, distinctly different from the golden yellow coloured parent ion exchanger. HISIIX thus prepared is washed and dried under nitrogen atmosphere at 50˚C and is stored in ethanol solution in airtight condition to prevent oxidation. 

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