| High‐performance removal of Anilin from aqueous solutions using EG‐ and PEG‐functionalized biochar: equilibrium, kinetic and thermodynamic studywith optimization by response surface methodology (RSM) |
| کد مقاله : 1042-ICOC |
| نویسندگان |
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فاطمه مکوندی *1، مهدی تقوی زاهد کلائی2، حسن علیجانی2 1دانشجوی کارشناسی ارشد،گروه شیمی،دانشکده علوم،دانشگاه شهید چمران اهواز،اهواز،ایران 2استادیار،گروه شیمی،دانشکده علوم،دانشگاه شهید چمران اهواز،اهواز،ایران |
| چکیده مقاله |
| Aniline and its derivatives pose serious risks to human health and disrupt ecological functions when released into aquatic environments. Adsorption has been recognized as an efficient and cost-effective method for removing aniline from water. In this study, four biochar-based magnetic adsorbents—BC/ZnFe₂O₄, OX-BC/ZnFe₂O₄, EG-BC/ZnFe₂O₄, and PEG-BC/ZnFe₂O₄—were synthesized and used for aniline adsorption. The maximum adsorption capacities were 70.4, 98.0, 300.3, and 526.3 mg/g, respectively. Functionalization with ethylene glycol and polyethylene glycol increased surface area and active adsorption sites, while ZnFe₂O₄ nanoparticles enabled rapid magnetic separation and strengthened hydrogen-bonding interactions . Optimization of pH, contact time, and adsorbent dosage was carried out using a Box–Behnken RSM design. The optimal pH was 7, with equilibrium contact times of 170, 50, 30, and 25 min and dosages of 0.7, 0.4, 0.3, and 0.15 g/L for the four adsorbents, respectively. Kinetic studies indicated that aniline adsorption followed the pseudo-second-order model, and equilibrium data were well described by the Langmuir isotherm . Thermodynamic parameters confirmed that the adsorption process was spontaneous and endothermic. All adsorbents also showed good reusability, maintaining stability over six adsorption–desorption cycles . Overall, PEG-BC/ZnFe₂O₄ exhibited the highest adsorption efficiency . |
| کلیدواژه ها |
| Aniline, Biochar, Magnetic nanocomposite, Adsorption, Water purification |
| وضعیت: پذیرفته شده |