The Effect of Synthesis Condition of the Ability of Swelling, Adsorption, and Desorption of Zwitterionic Sulfobetaine-Based Gel

• Published in: International Journal of Technology Vol. 11; no. 2; pp. 299 - 309
• Main Authors: Suprapto, Suprapto, Gotoh, Takehiko, Humaidah, Nurlaili, Febryanita, Renna, Firdaus, Muhammad Sa’i, Ningrum, Eva Oktavia
• Format: Journal Article
• Language: English
• Published: Universitas Indonesia 21.04.2020
• Subjects: adsorption; desorption; swelling; thermosensitive
• ISSN: 2086-9614; 2087-2100
• DOI: 10.14716/ijtech.v11i2.3860

This study explored the ion adsorption of heavy metals using a copolymer gel containing zwitterionic betaine N,N'-dimethyl(acrylamidopropyl)ammonium propane sulfonate (DMAAPS) as the ion adsorbent agent and N-isopropylacrylamide (NIPAM) as the thermosensitive agent. We investigated the effect of ion monomer concentration and type and of temperature on the adsorption, desorption, and swelling properties and their correlation. A free-radical polymerization reaction was performed to prepare the thermosensitive NIPAM-co-DMAAPS gel using accelerators such as N,N,N',N'-tetramethylethylenediamine, ammonium peroxydisulfate as the initiator, and N,N'-methylenebisacrylamide at a concentration of 10 mmol/L as the cross-linker. An analysis was then performed on the gel’s adsorption, desorption, and reversible adsorption-desorption properties using atomic absorption spectrophotometry. The results showed that the swelling degree and adsorption values increased as the temperature decreased in the gel with NIPAM:DMAAPS ratios of 9:1 and 8:2. In contrast, in a 7:3 ratio, the swelling degree increased significantly, and the adsorption ability decreased as the temperature increased. The higher the temperature, the smaller the quantity of Zn2+ and Pb2+ ions adsorbed and desorbed. The results indicate that in nitrate solution, Pb2+ ions are more easily adsorbed than Zn2+ ions.