Title of article :
Adsorptive removal of Cu(II) from aqueous solutions using non-crosslinked and crosslinked chitosan-coated bentonite beads Original Research Article
Author/Authors :
Maria Lourdes P. Dalida، نويسنده , , Ana Francia V. Mariano، نويسنده , , Cybelle M. Futalan، نويسنده , , Chi-Chuan Kan، نويسنده , , Wan-Chi Tsai، نويسنده , , Meng-Wei Wan، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Pages :
6
From page :
154
To page :
159
Abstract :
Batch experiments were executed to investigate the removal of Cu(II) from aqueous solutions using non-crosslinked (CCB) and crosslinked chitosan-coated (CCB-ECH) bentonite beads. CCB and CCB-ECH beads were characterized by BET surface area and pore diameter analysis and X-ray diffraction (XRD). The percentage removal and adsorption capacity of Cu(II) ions were examined as a function of initial concentration and pH. The equilibrium data of CCB agreed well with the Langmuir model while CCB-ECH beads showed a better fit with the Freundlich model. Based on the isotherm study, CCB is a homogenous adsorbent, whereas CCB-ECH is a heterogeneous adsorbent. The adsorption capacities of CCB and CCB-ECH at pH 4 are 12.21 and 9.43 mg/g, respectively. The kinetic data correlated well with the pseudo-second order equation, which implies that chemisorption is the rate-limiting step. The desorption study was performed using eluent solutions, tap water (pH 7) and HCl solution (pH 1 and pH 3). The best Cu(II) recovery was obtained using HCl solution (pH 1).
Keywords :
Bentonite , Desorption , Crosslinking , Chitosan , Adsorption isotherm
Journal title :
Desalination
Serial Year :
2011
Journal title :
Desalination
Record number :
1114602
Link To Document :
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