Pengaruh Waktu Kontak Adsorben Berbasis Ionic Imprinted Polymer (IIP) terhadap Kemampuan Pengikatan Fe(III) di Sungai Wonorejo Surabaya

Effect of Adsorbent Contact Time of Ionic Imprinted Polymer (IIP) on Fe(III) Binding Capacity in the Wonorejo River Surabaya

Besi (Fe) merupakan logam esensial yang berperan penting dalam berbagai proses biologis dan lingkungan. Namun, konsentrasi Fe yang berlebihan, terutama dalam bentuk Fe(III), dapat menimbulkan efek toksik, mengganggu ekosistem perairan, dan membahayakan kesehatan manusia. Penelitian ini bertujuan mengembangkan adsorben selektif berbasis Fe(III)-imprinted polymer (Fe(III)-IIP) untuk mengatasi kontaminasi Fe(III) dalam air. Fe(III)-IIP disintesis melalui polimerisasi presipitasi menggunakan Fe(NO₃)₃, EDTA, MAA, EGDMA, dan BPO sebagai komponen utama. Analisis FTIR menunjukkan keberhasilan pelepasan ion template melalui hilangnya pita serapan Fe–O, sedangkan karakterisasi SEM-EDX mengonfirmasi terbentuknya struktur berpori dan penurunan kandungan Fe setelah proses leaching. Hasil adsorpsi menunjukkan bahwa Fe(III)-IIP mencapai kondisi setimbang pada menit ke-30, dengan persen adsorpsi sebesar 83,32% dan kapasitas adsorpsi 4,43 mg/g. Proses adsorpsi tersebut mengikuti model kinetika pseudo second order (PSO).

Iron (Fe) is an essential metal that plays an important role in various biological and environmental processes. However, excessive concentrations of Fe, particularly in the form of Fe(III), can cause toxic effects, disrupt aquatic ecosystems, and pose risks to human health. This study aims to develop a selective adsorbent based on Fe(III)-imprinted polymer (Fe(III)-IIP) to binding Fe(III) contamination in water. The Fe(III)-IIP was synthesized through precipitation polymerization using Fe(NO₃)₃, EDTA, MAA, EGDMA, and BPO as the main components. FTIR analysis confirmed the successful removal of the template ions through the disappearance of the Fe–O absorption band, while SEM-EDX characterization verified the formation of a porous structure and a decrease in Fe content after the leaching process. Adsorption results showed that Fe(III)-IIP reached equilibrium at 30 minutes, with an adsorption percentage of 83.32% and an adsorption capacity of 4.43 mg/g. The adsorption process followed the pseudo-second-order (PSO) kinetic model.