(746f) Sorption of Heavy Metal Ions By Composite Cryogels Based on Bentonite Clay with Ionic and Nonionic Polymer
AIChE Annual Meeting
2021
2021 Annual Meeting
Environmental Division
Remediation of Emerging Contaminants and Legacy Compounds
Tuesday, November 9, 2021 - 1:45pm to 2:00pm
Composite cryosorbent based on bentonite clay (BC) mineral from domestic origin Manyrak field and ionic polymer – polyacrylic acid (PAA), nonionic polyacrylamide (PAAm) was synthesized and characterized physical and chemical properties, sorption capacity in relation to cadmium and lead metals using individual and model aqueous solution with the mixture of given two metal ions. The synthesis of PAA, PAAm cryogel was carried out by radical polymerization methods at -20°C for 8 hours. The composite BC/PAA cryogel was obtained with the ratio 1:1, 1:5 and 1:10. The structure and morphology of composite cryogels were investigated using FTIR, SEM and AFM. The content of bentonite clay was determined and found that the clay consist of mineral montmorillonite with high dispersion. The SEM and AFM images show the high porosity of polymer/clay composite cryogels compare to pure cryogels. The sorption capacity of PAA/BC for [Pb2+] was 97% and for [Cd2+] was 98%, and as for PAAm/BC for [Pb2+] was 88% and for [Cd2+] was 89%. Overall, the sorption capacity of PAA/BC was higher than PAAm/BC composite cryogels. Moreover, during the evaluation of sorption capacity of cryogels using the model solution, the value of both PAA/BC and PAAm/BC composites for [Pb2+] was higher than that of [Cd2+]. This is predicted by their differences in coordination number, atomic mass and radius.