TY - JOUR
T1 - Modification of regenerated cellulose membranes with cationic polymer and its Cr(VI) retention capacity
AU - Sánchez, Julio
AU - Espinosa, Carolina
AU - Tapiero, Yesid
AU - Santiago-García, José Luis
AU - Oyarzún, Diego P.
AU - Pizarro, Guadalupe del C.
N1 - Funding Information:
The authors thank the FONDECYT Project No. 11140324 and the DICYT (Project n? 021741SP), VRIDEI, Universidad de Santiago de Chile, and Ion Solutions SpA Chile. G. del C Pizarro acknowledges the financial assistance provided by VRAC grant number L215-12 and L216-03 of the Universidad Tecnol?gica Metropolitana (UTEM).
Funding Information:
The authors thank the FONDECYT Project No. 11140324 and the DICYT (Project n° 021741SP), VRIDEI, Universidad de Santiago de Chile, and Ion Solutions SpA Chile. G. del C Pizarro acknowledges the financial assistance provided by VRAC grant number L215-12 and L216-03 of the Universidad Tecnológica Metropolitana (UTEM).
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/1/1
Y1 - 2018/1/1
N2 - In this work, we report the modification of regenerated cellulose membranes through the “in situ” polymerization of [2-(acryloyloxy)ethyl] trimethylammonium chloride monomer and N,N'-methylenebis(acrylamide) crosslinker. The polymerization reaction was performed using 1% mol of ammonium persulfate as initiator, and varying both the monomer concentration (10–25 mmol/L) and the percentage of crosslinker (4 and 8 mol%). The degree of modification (DM) and water absorption capacity (WAC) at different pHs were calculated gravimetrically. These modified membranes were characterized by FTIR, SEM, TGA, electrokinetic potential and permeability. The Cr(VI) retention capacity of the modified membranes was evaluated at different pHs. The DM values were between 23.46% and 41.82%. The highest WAC was for the membrane prepared with 25 mmol/L of monomer and 4 mol% of crosslinker independent of the pH value. The FTIR characterization showed absorption bands confirming this membrane modification. The SEM analysis showed the morphological changes of the membranes by the presence of interpolymeric networks. TGA showed a typical thermogravimetric curve of the polymers that contain quaternary ammonium groups. Modified ultrafiltration membranes exhibited good thermal stability. Electrokinetic potential revealed that the modified membrane is cationic in a wide range of pH and permeability test showed that all the modified membranes decrease the volumetric flux. The results of Cr(VI) retention indicate that it is possible to remove this metal at different pHs (3, 6 and 9), highlighting the highest retention at pH 6, reaching a value of 94% when 20 mg/L of chromium (VI) was used in the feed.
AB - In this work, we report the modification of regenerated cellulose membranes through the “in situ” polymerization of [2-(acryloyloxy)ethyl] trimethylammonium chloride monomer and N,N'-methylenebis(acrylamide) crosslinker. The polymerization reaction was performed using 1% mol of ammonium persulfate as initiator, and varying both the monomer concentration (10–25 mmol/L) and the percentage of crosslinker (4 and 8 mol%). The degree of modification (DM) and water absorption capacity (WAC) at different pHs were calculated gravimetrically. These modified membranes were characterized by FTIR, SEM, TGA, electrokinetic potential and permeability. The Cr(VI) retention capacity of the modified membranes was evaluated at different pHs. The DM values were between 23.46% and 41.82%. The highest WAC was for the membrane prepared with 25 mmol/L of monomer and 4 mol% of crosslinker independent of the pH value. The FTIR characterization showed absorption bands confirming this membrane modification. The SEM analysis showed the morphological changes of the membranes by the presence of interpolymeric networks. TGA showed a typical thermogravimetric curve of the polymers that contain quaternary ammonium groups. Modified ultrafiltration membranes exhibited good thermal stability. Electrokinetic potential revealed that the modified membrane is cationic in a wide range of pH and permeability test showed that all the modified membranes decrease the volumetric flux. The results of Cr(VI) retention indicate that it is possible to remove this metal at different pHs (3, 6 and 9), highlighting the highest retention at pH 6, reaching a value of 94% when 20 mg/L of chromium (VI) was used in the feed.
KW - Hexavalent chromium
KW - Membrane modification
KW - Metal retention
KW - Polymer
UR - http://www.scopus.com/inward/record.url?scp=85046692526&partnerID=8YFLogxK
U2 - 10.1016/j.jwpe.2018.04.016
DO - 10.1016/j.jwpe.2018.04.016
M3 - Article
AN - SCOPUS:85046692526
SN - 2214-7144
VL - 30
JO - Journal of Water Process Engineering
JF - Journal of Water Process Engineering
M1 - 100619
ER -