| Novel Macroporous Oxidized Alginate-Dapsone Adsorbents for Efficient Hexavalent Chromium Remediation |
| کد مقاله : 1269-ICOC |
| نویسندگان |
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رقیه عالی زاده ایسینی *1، محمد دیناری2 1دانشجو 2اصفهان دانشگاه صنعتی اصفهان |
| چکیده مقاله |
| Hexavalent chromium (Cr (VI)) poses severe environmental and health risks due to its high toxicity, carcinogenicity, and mobility. Traditional removal methods often struggle with efficiency and selectivity, particularly in acidic industrial wastewaters [1-3]. This study introduces a novel class of macroporous adsorbents developed through controlled periodate oxidation of sodium alginate followed by Schiff-base crosslinking with 4,4'-diaminodiphenyl sulfone (DDS). This strategy leverages the biodegradability of alginate while overcoming its limitations in acidic media through the creation of aldehyde functions and highly porous structures, dramatically improving mechanical stability and binding-site accessibility. The incorporation of DDS, with its protonatable amine and sulfone groups, was specifically designed to enhance Cr(VI) anion binding under acidic conditions. Comprehensive characterization using FTIR (confirming aldehyde disappearance and C=N formation), SEM, and XRD analyses elucidated the successful synthesis and structural properties of the oxidized alginate-DDS polymers. Adsorption performance was rigorously evaluated across various pH values, initial Cr (VI) concentrations, and in the presence of competing ions. Optimal Cr (VI) uptake was observed at strongly acidic pH, primarily driven by electrostatic attraction with the protonated nitrogen sites on the DDS moiety. This facile and environmentally friendly synthesis yields a cost-effective and biodegradable material, offering a promising and sustainable solution for the efficient removal of Cr (VI) and other heavy metals from industrial wastewaters. |
| کلیدواژه ها |
| Oxidized Alginate, Heavy Metal Removal, Adsorption, 4 4'-diaminodiphenyl sulfone, Wastewater Treatment |
| وضعیت: پذیرفته شده |