نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشیار گروه علوم خاک، دانشکده کشاورزی، دانشگاه ملایر، ملایر، ایران
2 دانشگاه ملایر، ملایر، ایران
3 دانشگاه ملایر، ملایر ، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
This study was conducted to evaluate the efficiency of graphene nanosheets in the removal of cationic dyes Rhodamine B, Malachite Green, and Methylene Blue from aqueous solutions. Experiments were performed by investigating the effects of parameters such as adsorbent dosage (1 to 5 g/L), pH (3 to 7), contact time (10 to 180 minutes), and temperature (20 to 60 °C). The adsorption efficiency of Malachite Green under optimal conditions (pH = 4, temperature 40 °C, adsorbent dosage 2 g/L, contact time 90 minutes) was 88.15%, which was higher than that of the other two dyes. Isotherm studies showed that the adsorption of Malachite Green and Methylene Blue followed the Langmuir model (R² > 0.90), while Rhodamine B followed the Freundlich model (R² = 0.99). Kinetic data best fitted the pseudo-second-order model (R² > 0.98), indicating chemisorption. Thermodynamic parameters also confirmed that the adsorption process was endothermic and spontaneous. The results demonstrate that graphene nanosheets are efficient, economical, and environmentally friendly adsorbents for the removal of cationic dyes from industrial wastewater.
کلیدواژهها [English]