کارایی حذف رنگزای کنگورد توسط نانو جاذب‌های معدنی بیدلیت و آلی گرافن

نوع مقاله : مقاله پژوهشی

نویسندگان

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

10.30509/jcst.2025.167405.1243

چکیده

هدف این پژوهش، بررسی کارایی جاذب‌های بیدلیت و گرافن در حذف رنگزای کنگورد از آب به منظور بهبود فرآیندهای تصفیه آب است. رنگزای کنگورد به دلیل خطرات زیست‌محیطی و بهداشتی، نیازمند حذف مؤثر از منابع آبی است. در این پژوهش، جاذب‌های بیدلیت و گرافن با آنالیزهای دستگاهی همانندSEM, FTIR, EDAX, XRD  و پتانسیل زتا  بررسی می‌شود. اثر عواملی نظیر غلظت جاذب، pH، دما و زمان تماس بر روی جذب رنگ مورد آزمایش قرار گرفتند. نتایج نشان داد که جاذب گرافن با راندمان 87.66 درصد در دمای 50 درجه سانتی‌گراد و 9pH= و جاذب بیدلیت با راندمان 80.78 درصد در دمای 20 درجه سانتی‌گراد و 6pH= بهترین عملکرد را در حذف کنگورد از آب داشتند. مدل‌های سینتیکی شبه مرتبه دوم و ایزوترم فروندلیچ به ترتیب بهترین برازش را با داده‌های آزمایشگاهی نشان دادند. همچنین، بررسی متغیرهای ترمودینامیکی نشان داد که فرآیند جذب در هر دو جاذب گرافن و بیدلیت خودبه‌خودی اما واکنش در بیدلیت گرمازا و گرافن گرماگیر بود. ضمنا ظرفیت جذب برای گرافن و بیدلیت به ترتیب 5.47 و 6.73 میلی‌گرم بر گرم به‌دست آمد. نتایج آزمایش‌های واجذب نشان دادند به ویژه در غلظت‌های پایین رنگزا میزان بازیافت بالا است. بنابراین با توجه کارایی بالای جاذب‌های بیدلیت و گرافن در حذف رنگزای کنگورد و امکان استفاده مجدد از آن‌ها در فرآیندهای تصفیه آب، پژوهش‌های بیشتر بر روی این ترکیبات توصیه می‌شود.  

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The Efficiency of Congo red Dye Removal Using Inorganic Nano-Adsorbent Beidellite and Organic Graphene

نویسندگان [English]

  • Shahriar Mahdavi
  • Mahsa Mosavi
  • Amin Toranjian
Department of Soil Science and Engineering, Faculty of Agriculture, Malayer University, Postal Code: 65741-84621, Malayer, Iran
چکیده [English]

This study aimed to evaluate the efficiency of Beidellite and graphene adsorbents in removing Congo red dye from water to enhance water treatment processes. Due to Congo Red's environmental and health risks, its effective removal from water resources is essential. This research examined Beidellite and graphene adsorbents using instrumental analyses such as SEM, FTIR, EDAX, XRD, and zeta potential. The influence of adsorbent concentration, pH, temperature, and contact time on dye adsorption was also investigated. The results demonstrated that graphene achieved a removal efficiency of 87.66 % at a temperature of 50°C and pH=9, while Beidellite exhibited a removal efficiency of 80.78 % at a temperature of 20 °C and pH=6, showing optimal performance in removing Congo red from water. The pseudo-second-order kinetic model and Freundlich isotherm provided the best fit for the experimental data. Besides, thermodynamic parameter analysis revealed that the adsorption process for both graphene and Beidellite was spontaneous, with the reaction being exothermic for Beidellite and endothermic for graphene. The adsorption capacities for graphene and Beidellite were determined to be 5.47 mg/g and 6.73 mg/g, respectively. Desorption experiments indicated a high recovery rate, particularly at low dye concentrations. Therefore, further research on these compounds is recommended, given the high efficiency of Beidellite and graphene adsorbents in removing Congo red and their potential for reuse in water treatment processes.

کلیدواژه‌ها [English]

  • Adsorption
  • Congo red
  • Graphene
  • Beidellite
  • Kinetics
  • Isotherm
  • Thermodynamics

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