Water Pollution Treatment Using Eco-Friendly ZnO–Chitosan Bio-Composites | ||
| Pollution | ||
| مقاله 9، دوره 12، شماره 4، زمستان 2026، صفحه 1119-1134 اصل مقاله (1.02 M) | ||
| نوع مقاله: Original Research Paper | ||
| شناسه دیجیتال (DOI): 10.22059/poll.2026.415226.3348 | ||
| نویسندگان | ||
| Alyaa A Zidan* 1؛ Mohamed Abdelaziz Okbah1؛ Salah Abdelmoula Mohamed Abokhder2؛ Nouria El Hadi Ali Aboshaala3؛ Elham M Moaalem4، 5 | ||
| 1National Institute of Oceanography and Fisheries, Cairo, Egypt | ||
| 2Department of Environment, Faculty of Natural Resources Engineering, University of Zawia, Libya | ||
| 3Department of Geology, Faculty of science, University of Zawia, Libya | ||
| 4Department of Oceanography, Faculty of Science, University of Alexandria, Alexandria 21511, Egypt | ||
| 5Faculty of Marine Science, Hodeidah University, Yemen | ||
| چکیده | ||
| Natural organic matter, particularly humic acid (HA), is a major water contaminant due to its complex structure, strong metal-binding ability, and role as a precursor of toxic disinfection by-products formed during chlorination. This study developed a green and biodegradable ZnO–chitosan bio-composite (ZnO@Cs BC) for efficient HA removal from aqueous solutions. The composite was synthesized by dispersing ZnO within a chitosan matrix and characterized using FTIR, XRD, SEM/EDX, and TGA-DSC, confirming successful ZnO incorporation and enhanced structural and thermal stability compared with pristine chitosan. Batch adsorption experiments evaluated the effects of pH (3–11), contact time (10–180 min), adsorbent dosage (0.05–1.0 g), initial HA concentration (5–100 mg L⁻¹), and temperature (20–60 °C). The ZnO@Cs BC achieved over 90% HA removal across a broad pH range and a maximum removal efficiency of 99.8% under optimum conditions (pH 7, 25 °C, 120 min, 0.05 g adsorbent, and 5 mg L⁻¹ HA). Adsorption kinetics followed the pseudo-second-order model (R² ≈ 1), indicating chemisorption, while equilibrium data were best described by the Langmuir isotherm (R² = 0.99), with a maximum adsorption capacity of 4.535 mg g⁻¹. Thermodynamic analysis confirmed that adsorption was spontaneous (ΔG° < 0) and endothermic (ΔH° > 0). The composite retained approximately 85% of its adsorption capacity after five regeneration cycles, demonstrating excellent reusability. These results highlight ZnO@Cs BC as an effective, sustainable, and cost-efficient adsorbent for removing HA from water. | ||
| کلیدواژهها | ||
| Humic Acid؛ Chitosan Composite؛ Zno Nanoparticles؛ Adsorption Isotherm؛ Natural Organic Matter | ||
| مراجع | ||
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