TY - JOUR
T1 - Interpenetrating network nanocomposite hydrogels as efficient adsorbents for the removal of total impurities from industrial lean methyldiethanolamine solution
AU - Edathil, Anjali Achazhiyath
AU - Othman, Israa
AU - Pal, Priyabrata
AU - Banat, Fawzi
N1 - Funding Information:
The authors are grateful to Khalifa University Gas Processing and Materials Science Research Center, Abu Dhabi, for funding the project (GRC11006).
Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2022
Y1 - 2022
N2 - Natural gas can be sweetened by removing acidic gases with aqueous methyldiethanolamine (MDEA) solvents. Heavy metal ions and total organic acid anions (TOA) contaminate the industrial lean MDEA during this process. Continuous accumulation of these impurities creates operational problems, such as corrosion, fouling, and foaming of the operational unit. In this study, a series of interpenetrating network (IPN) nanocomposite hydrogels based on sodium alginate and acrylamide were successfully synthesized in the presence of fillers, such as silica (Alg-Aam-SiO2), polyaniline-coated silica (Alg-Aam-PA-SiO2), graphene oxide (Alg-Aam-GO), and thermally reduced graphene oxide (Alg-Aam-TRGO). The synthesized IPN hydrogels were applied for the adsorption of TOA and heavy metals (chromium and iron) simultaneously from lean MDEA. Different characterization techniques, such as FTIR, Raman, TGA, XRD, SEM, TEM, and equilibrium swelling studies, were performed to understand the superiority of the hydrogels. The maximum monolayer adsorption capacity of TOA anions at 53 °C was 21.45 mg/g for Alg-Aam, 23.47 mg/g for Alg-Aam-SiO2, 20.16 mg/g for Alg-Aam-PA-SiO2, 19.19 mg/g for Alg-Aam-TRGO, and 15.29 mg/g for Alg-Aam-GO. Thermodynamically, the adsorption of all contaminants was favorable, spontaneous, and endothermic. The produced Alg-Aam-based nanocomposite hydrogels are a great candidate for purifying the contaminated lean MDEA solvents.
AB - Natural gas can be sweetened by removing acidic gases with aqueous methyldiethanolamine (MDEA) solvents. Heavy metal ions and total organic acid anions (TOA) contaminate the industrial lean MDEA during this process. Continuous accumulation of these impurities creates operational problems, such as corrosion, fouling, and foaming of the operational unit. In this study, a series of interpenetrating network (IPN) nanocomposite hydrogels based on sodium alginate and acrylamide were successfully synthesized in the presence of fillers, such as silica (Alg-Aam-SiO2), polyaniline-coated silica (Alg-Aam-PA-SiO2), graphene oxide (Alg-Aam-GO), and thermally reduced graphene oxide (Alg-Aam-TRGO). The synthesized IPN hydrogels were applied for the adsorption of TOA and heavy metals (chromium and iron) simultaneously from lean MDEA. Different characterization techniques, such as FTIR, Raman, TGA, XRD, SEM, TEM, and equilibrium swelling studies, were performed to understand the superiority of the hydrogels. The maximum monolayer adsorption capacity of TOA anions at 53 °C was 21.45 mg/g for Alg-Aam, 23.47 mg/g for Alg-Aam-SiO2, 20.16 mg/g for Alg-Aam-PA-SiO2, 19.19 mg/g for Alg-Aam-TRGO, and 15.29 mg/g for Alg-Aam-GO. Thermodynamically, the adsorption of all contaminants was favorable, spontaneous, and endothermic. The produced Alg-Aam-based nanocomposite hydrogels are a great candidate for purifying the contaminated lean MDEA solvents.
KW - Adsorption
KW - Alkanolamine
KW - Hydrogel
KW - Impurities
KW - Interpenetrating network
KW - Nanocomposite
UR - http://www.scopus.com/inward/record.url?scp=85140989775&partnerID=8YFLogxK
U2 - 10.1007/s00289-022-04542-2
DO - 10.1007/s00289-022-04542-2
M3 - Article
AN - SCOPUS:85140989775
SN - 0170-0839
JO - Polymer Bulletin
JF - Polymer Bulletin
ER -