TY - JOUR
T1 - Static and dynamic adsorption of copper ions on chitosan/polyvinyl alcohol thin adsorptive membranes
T2 - Combined effect of polyethylene glycol and aminated multi-walled carbon nanotubes
AU - Salehi, E.
AU - Madaeni, S. S.
AU - Rajabi, L.
AU - Derakhshan, A. A.
AU - Daraei, S.
AU - Vatanpour, V.
PY - 2013/1/5
Y1 - 2013/1/5
N2 - Polyethylene glycol (PEG) and amino-modified multi-walled carbon nanotubes (MWCNT-NH2) were utilized to modify chitosan/polyvinyl alcohol (CS/PVA) thin adsorptive membranes for copper ion adsorption. SEM, AFM, water affinity and mechanical analysis were performed for membrane characterization. Batch adsorption experiments were conducted to determine the effects of additive, pH, metal concentration and temperature on adsorption. Macroporous membranes were prepared by introducing PEG into the casting dopes; however, the upper limit for PEG loading was 5wt%. Adsorption capacity of CS/PVA membrane was increased from 11 to 30mg/g by addition of 5wt% PEG to the blend. Addition of MWCNT-NH2, especially at optimal concentration of 1wt%, improved membranes adsorption/transport behavior by creation of nanochannels and supplementary interstices in the compact CS/PVA matrix. Copper ion adsorption on CS/PVA membrane was elevated from 11 to 19mg/g by introducing 1wt% MWCNT-NH2. Thermodynamic parameters (ΔH°, ΔS° and ΔG°) revealed endothermic nature, favorability and spontaneity of the adsorption. Moreover, kinetic studies showed that MWCNT-NH2 plays primary role in adsorption rate enhancement. Adsorptive membranes containing combined MWCNT-NH2 and PEG (called 'CPMP'), demonstrated superior sorption capacity (~35mg/g) and reusability among tested membranes. Finally, thin adsorptive membranes were tested in dynamic mode using a dead-end filtration setup. CPMP showed superior performance as expected. Based on the results, introducing combined MWCNT-NH2-NH2 and PEG can greatly elevate CS/PVA membranes capability for adsorptive removal of copper ions from water.
AB - Polyethylene glycol (PEG) and amino-modified multi-walled carbon nanotubes (MWCNT-NH2) were utilized to modify chitosan/polyvinyl alcohol (CS/PVA) thin adsorptive membranes for copper ion adsorption. SEM, AFM, water affinity and mechanical analysis were performed for membrane characterization. Batch adsorption experiments were conducted to determine the effects of additive, pH, metal concentration and temperature on adsorption. Macroporous membranes were prepared by introducing PEG into the casting dopes; however, the upper limit for PEG loading was 5wt%. Adsorption capacity of CS/PVA membrane was increased from 11 to 30mg/g by addition of 5wt% PEG to the blend. Addition of MWCNT-NH2, especially at optimal concentration of 1wt%, improved membranes adsorption/transport behavior by creation of nanochannels and supplementary interstices in the compact CS/PVA matrix. Copper ion adsorption on CS/PVA membrane was elevated from 11 to 19mg/g by introducing 1wt% MWCNT-NH2. Thermodynamic parameters (ΔH°, ΔS° and ΔG°) revealed endothermic nature, favorability and spontaneity of the adsorption. Moreover, kinetic studies showed that MWCNT-NH2 plays primary role in adsorption rate enhancement. Adsorptive membranes containing combined MWCNT-NH2 and PEG (called 'CPMP'), demonstrated superior sorption capacity (~35mg/g) and reusability among tested membranes. Finally, thin adsorptive membranes were tested in dynamic mode using a dead-end filtration setup. CPMP showed superior performance as expected. Based on the results, introducing combined MWCNT-NH2-NH2 and PEG can greatly elevate CS/PVA membranes capability for adsorptive removal of copper ions from water.
KW - Aminated MWCNTs
KW - Chitosan
KW - Kinetic
KW - Membrane adsorption
KW - Porogen
UR - http://www.scopus.com/inward/record.url?scp=84870805942&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2012.11.071
DO - 10.1016/j.cej.2012.11.071
M3 - Article
AN - SCOPUS:84870805942
SN - 1385-8947
VL - 215-216
SP - 791
EP - 801
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -