| Magnetic CoFe2O4@SiO2@Phycocyanin Nanocomposite: A Bio-Derived Platform for Mercury Removal from Industrial Wastewater |
| کد مقاله : 1302-IWWA |
| نویسندگان |
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الهه مشهدی * کارمند شرکت آب و فاضلاب استان قم |
| چکیده مقاله |
| Mercury is among the most toxic metals discharged in industrial effluents. Wastewater from chlor-alkali plants, mining, battery manufacture and pulp processing can carry mercury at the milligram-per-liter level, three orders of magnitude above the 6 µg per liter the World Health Organization accepts in drinking water, so such streams must be polished before discharge. Magnetically separable adsorbents suit this duty because they avoid filtration, but almost all rely on synthetic organic ligands. This paper reports the synthesis and full characterization of a bio-derived alternative: C-phycocyanin, the blue phycobiliprotein of Spirulina, immobilized on silica-coated cobalt ferrite to give CoFe2O4@SiO2@PC. Phycocyanin is a food-grade protein carrying cysteine thiol, thioether, amine, imidazole and carboxylate donors, and its beta-84 and beta-155 cysteines bind mercury about five times more strongly than lead. FE-SEM shows quasi-spherical particles with a median equivalent diameter of 37 nm in an open porous network. XRD confirms a single cubic inverse spinel phase, lattice parameter 8.41 Å and Scherrer crystallite size near 9 nm, superimposed on an amorphous halo from silica and protein. EDX detects nitrogen and Sulphur distributed uniformly over the particles, the fingerprint of the protein shell, and FTIR resolves amide I, carboxylate, Si-O-Si and spinel metal-oxygen bands, confirming the three-layer architecture. Saturation magnetization falls from 45.4 to 11.5 emu per gram, still ample for magnetic recovery from a wastewater stream. Mercury uptake measurements on this batch are in progress; the batch protocol, the modelling framework and the post-loading analyses designed to quantify performance are specified in full. |
| کلیدواژه ها |
| Phycocyanin, Cobalt ferrite, Magnetic nanocomposite, Mercury removal, Biosorption, Industrial wastewater |
| وضعیت: پذیرفته شده برای ارسال فایل های ارائه پوستر |
