Alternative use of cross-linked XXXX (known as Sevelamer pharmaceutical compound) as biosorbent.

@entity28378 @entity1472 @entity6596 @entity4482 @entity3991 @entity11649
In this study, an alternative use of @entity11649 (SEV, a cross-linked @entity28378 which is a widely known pharmaceutical compound) was suggested. The existence of primary and secondary @entity1472 groups (with different ratios) in its molecule increases its adsorption potential and use as biosorbent material. SEV was tested as biosorbent material aiming the removal of heavy metals and dyes from simulated effluents. As heavy metals and dyes, @entity6596 ( @entity6596 ) and @entity4482 ( @entity4482 ) were used, respectively. A full adsorption study was done confirming the strong adsorption capability of SEV. The maximum theoretical adsorption capacity (Qm) was 772 and 485mg/g for single-component solutions of @entity4482 and @entity6596 , respectively; the respective values for binary mixtures of the same concentration (200mg/L) were 445 and 309mg/g respectively (calculated after fitting to Langmuir-Freundlich isotherm model at 25  C). The same experiments were also done at increasing temperatures (45 and 65  C) concluding thermodynamic remarks (  H(0)>0;   G(0)<0;   S(0)>0). The effect of contact time was analyzed running kinetic adsorption experiments and fitting them to pseudo-second order kinetic equation. The reusability was evaluated completing successfully 20 cycles of reuse (adsorption/desorption). The adsorption mechanism among SEV molecules and @entity6596 or/and @entity4482 was clarified using FTIR spectroscopy before and after adsorption in line with a detailed theoretical modeling which provided important calculations. SEV was also characterized using swelling experiments, @entity3991 , SEM, XRD, TGA techniques.
