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Silica  gel  was  modified  via  silylation  using  3-chloropropyltrimethylsilane  and functionalization  using  1,10-phenanthroline.  FTIR,  DSC  and  quantitative  SEM-EDX  data were obtained to confirm functionalization. The uptakes of cadmium (II) and lead (II) by the phenanthroline-modified  silica  (Phen-Si)  were  determined  using  equilibrium  and  dynamic methods.  For  the  equilibrium  method,  percent  adsorbed  for  5  to  200  ppm  metal  ion solutions  ranged  from  0  %  to  93.2  %  (for  Cd)  and  from  81.6  %  to  95.2  %  (for  Pb)  The maximum  uptake  of  Phen-Si  is  91.89  mg  Pb/g  silica  and  93.06  mg  Cd/g  silica  for  the equilibrium method while for the dynamic method, maximum uptake was 25.65 ± 6.52 mg Pb/g silica and 17.68 ± 2.33 mg Cd/g silica.

Modification of Silica Gel with 1,10-Phenanthroline for Cd(II) and Pb(II) Adsorption