Functionalization Of BIS/HEMA Cryogel Matrix with Tannic Acid: An Eco-Friendly Purification Approach
Abstract
In this study, BIS/HEMA-based cryogels were synthesized as an environmentally friendly purification approach and functionalized with tannic acid to investigate their applicability for the removal of Pb(II) ions from aqueous solution. Two different modifications were performed by using 5 and 10 mg/100 µL of tannic acid, and the adsorption performance of the resulting cryogels was evaluated under parameters such as pH, contact time, adsorbent dose, and temperature. Based on batch adsorption experiments, the maximum Pb(II) removal for all cryogel types was observed at pH 6, and the highest adsorption capacity was achieved with the cryogel modified with 10 mg of tannic acid. Under optimum conditions (pH: 4; Time: 60 min; Dose: 0.05 g; Temperature: 25o C) maximum Pb(II) removal was determined to be approximately 99%. Kinetic analyses revealed that the adsorption process followed a pseudo-second-order kinetic model, indicating that chemical interactions were dominant. Isotherm modeling showed that the adsorption behavior fitted the Langmuir model, suggesting a monolayer and homogeneous surface structure. Thermodynamic data indicated that the adsorption process was spontaneous and endothermic. The obtained findings demonstrate that BIS/HEMA cryogels functionalized with tannic acid represent an effective and sustainable adsorbent alternative for heavy metal removal in wastewater treatment.
Keywords
References
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