Vipin Kumar Saini - Removal of chlorophenols from wastewater using red mud: an aluminium industry waste

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      Publication Details (including relevant citation   information):

      Published in, Environmental Science & Technology, 38, 4012 –   4018 (2004). (Impact factor 4.63 ) (Citations   57)


      Removal of toxic substances from wastewaters using low-cost   alternatives  to activated carbon is an important area in   environmental sciences.  Efforts have been made to convert   red mud, an aluminum industry waste,  into a low-cost   potential adsorbent, and the final material has been  used   for the removal of phenol, 2-chlorophenol, 4-chlorophenol,   and  2,4-dichlorophenol from wastewater. It is pertinent to   mention that  phenol and chlorophenols are highly   carcinogenic and an priority class  of pollutants which   needs to be removed from effluents before discharge  into   water bodies. 2,4-Dichlorophenol and 4-chlorophenol are sorbed   by  the developed adsorbent up to 94−97%, while the removal   of  2-chlorophenol and phenol was up to 50−81%. The removal   of phenols and  its derivatives was achieved up to 98% by   column experiments at a flow  rate of 0.5 mL/min. The order   of removal was 2,4-dichlorophenol >  4-chlorophenol >   2-chlorophenol > phenol, and the removal takes  place   through a particle diffusion mechanism. The adsorption was   found  to be endothermic in nature and follows both Langmuir   and Freundlich  models. Estimation of the phenols was   carried out by capillary  electrophoresis, and the adsorbent   has been successfully tried for the  removal of   chlorophenols from a wastewater. The developed process is    very useful, economic, rapid, and reproducible for the removal   of  phenols.

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