Nilma Safitri, Alizar Ulianas, Deski Beri, Sharina Abu Hanifah, Riyadh Abdulmalek Hassan, Syamsi Aini, Ling Ling Tan
Ion imprinted polymers (IIPs) are polymeric materials that possess specific recognition cavities capable of selectively binding target ions. This study aims to synthesize Cd2+-based IIPs as selective adsorbents for cadmium ions. The synthesis was carried out using Cd(NO3)2·4H2O as the template ion, MAA as the functional monomer, EGDMA as the crosslinker, and DMPP as the initiator. The synthesized IIPs were characterized using FTIR. The FTIR spectrum shows a difference in the C–O absorption band, namely 1,144.75 cm−1 on NIP and 1,145.41 cm−1 on IIPs-Cd. Then, the C–O absorption band shifted to 1,144.05 cm−1 when Cd was extracted from IIPs-Cd, but the absorption band reappeared at 1,144.72 cm−1 after Cd2+ rebinding, which indicated the presence of Cd–O coordination interaction and confirmed that the printing process was successful. The highest adsorption capacity was achieved at an MAA: EGDMA ratio of 1 mmol:4 mmol, pH 4, an extraction time of 60 min, a contact time of 30 min, and an initial Cd2+ concentration of 25 mg/L, yielding a maximum adsorption capacity of 0.6528 mg/g. The adsorption process followed the Langmuir isotherm model with an R 2 value of 0.9551 and exhibited high selectivity toward Cd2+ compared to competing ions Zn2+, Cu2+, and Pb2+. © 2026 Walter de Gruyter GmbH, Berlin/Boston.
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang, Jl. Prof. Hamka, Padang, 25131, Indonesia; Biosensor and Chemical Sensor Research Centre, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang, Jl. Prof. Hamka, Padang, 25131, Indonesia; Department of Chemical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Selangor, Bangi, 43600, Malaysia; Department of Chemistry, Faculty of Science, Ibb University, PO Box: 70270, Ibb, Yemen; Southeast Asia Disaster Prevention Research Initiative (SEADPRI), Institute for Environment and Development (LESTARI), Universiti Kebangsaan Malaysia, UKM Bangi, Selangor, 43600, Malaysia
