ارزیابی کارایی نانوصفحات گرافن درحذف رنگزا‌های آلی از محلول‌های آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه ملایر، ملایر، ایران، صندوق‌پستی: 84621-65741

10.30509/jcst.2025.167552.1259

چکیده

این پژوهش با هدف ارزیابی کارایی نانو صفحات گرافن در حذف رنگزا‌های کاتیونی رودامین B، مالاشیت سبز و متیلن بلو از محلول‌های آبی انجام شد. آزمایش‌ها با بررسی اثر متغیرهایی مانند مقدار جاذب (۱ تا ۵ گرم بر لیتر)، pH (۳ تا ۷)، زمان تماس (۱۰ تا۱۸۰ دقیقه) و دما (۲۰ تا ۶۰ درجه سانتی‌گراد) انجام شد. بازده جذب مالاشیت سبز در شرایط بهینه (4pH= ، دما °C 40، جاذب 2 گرم بر لیتر و زمان 90 دقیقه) برابر 15/88 درصد و بالاتر از دو رنگزای دیگر بود. مطالعه ایزوترم‌ها نشان داد که جذب مالاشیت سبز و متیلن بلو از مدل لانگمویر(90/0R²>) و رودامین  Bاز مدل فروندلیچ (۹۹/0= R²) تبعیت می‌کند. براساس مدل لانگمویر، حداکثر ظرفیت جذب (qmax) برای رودامین B، مالاشیت سبز و متیلن بلو به ترتیب 56/5، 65/5 و 78/11میلی‌گرم بر گرم به ‌دست آمد. داده‌های سینتیکی نیز بهترین برازش را با مدل شبه‌ مرتبه دوم (98/0<R² ) داشتند که بیانگر جذب شیمیایی است. عوامل ترمودینامیکی نیز گرماگیر و خودبه‌خودی بودن فرایند جذب را تأیید کردند. نتایج نشان می‌دهد نانوصفحات گرافن جاذبی کارآمد، اقتصادی و سازگار با محیط‌زیست برای حذف رنگزا‌های کاتیونی از فاضلاب صنعتی هستند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluation of the Efficiency of Graphene Nano- sheets in the Removal of Organic Dyes from Aqueous Solutions

نویسندگان [English]

  • Shahriar Mahdavi
  • Sadegh Yousefi ourand
  • Firouzeh Norouzi goldareh
  • Amin Toranjian
Department of Soil Science and Engineering, Faculty of Agriculture, Malayer University, P.O. Box: 65741-84621, Malayer, Iran.
چکیده [English]

This study aimed to evaluate the efficiency of graphene nano-sheets in the removal of cationic dyes Rhodamine B, Malachite Green, and Methylene Blue from aqueous solutions. The experiments were conducted by investigating the effects of various parameters, including adsorbent dosage (1–5 g/L), pH (3–7), contact time (10–180 minutes), and temperature (20–60 °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 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). According to the Langmuir model, the maximum adsorption capacities (qmax) for Rhodamine B, Malachite Green, and Methylene Blue were found to be 5.56, 5.65, and 11.78 mg/g, respectively. The 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. Overall, the results demonstrated that graphene nano-sheets are an efficient, cost-effective, and environmentally friendly adsorbent for the removal of cationic dyes from industrial wastewater.

کلیدواژه‌ها [English]

  • Adsorption Rhodamine Malachite green Methylene blue Graphene nano
  • sheets

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