نشریه محیط زیست طبیعی

جذب مالاشیت‌‌گرین از محلول‌های آبی توسط نانوکامپوزیت گرافن مغناطیسی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه شیمی تجزیه، دانشگاه پیام نور واحد ساری، ساری، ایران

2 گروه محیط زیست دانشکده منابع طبیعی و علوم دریایی . دانشگاه تربیت مدرس. نور. ایران

3 گروه شیمی، دانشگاه پیام نور، تهران، ایران

4 گروه محیط زیست دانشکده منابع طبیعی و علوم دریایی . دانشگاه تربیت مدرس. نور.ایران

چکیده

حضور ترکیب‌های شیمیایی در محیط‌زیست، تهدیدی جدی برای سلامتی انسان و سایر زیستمندان تلقی می ­شود؛ یکی از این ترکیبات مالاشیت‌گرین است که ورود آن به منابع آبی سبب مشکلاتی برای بشر و بهداشت عمومی می‌شود. استفاده از نانو جاذب­ ها روشی نوین و کارآمد جهت حذف آلاینده‌‌ها از محیط­ های آبی است. امروزه از گرافن به‌دلیل دارا بودن خواص منحصر به‌فردی نظیر سطح بالا در حذف آلاینده‌ها، استفاده می ­شود. در این مطالعه گرافن از پسماند کاه برنج که به‌عنوان یک مادة دورریز محسوب می ­گردد تهیه شده و سپس به روش حلال گرمایی مغناطیسی گردید. آنالیز­های SEM،BET،Raman  وFTIR  به‌‌‌منظور تشخیص و بررسی ویژگی­ های نانوکامپوزیت سنتز شده صورت پذیرفت. سپس این نانوکامپوزیت برای حذف مالاشیت‌گرین از محلول­ های آبی در سیستم ناپیوسته مورد مطالعه قرار گرفت. عوامل مؤثر بر میزان جذب مانند pH، مقدار جاذب، زمان تماس، غلظت اولیه­ مالاشیت‌گرین و اثر دما مورد بررسی قرار گرفت. نتایج نشان داد بیشترین ظرفیت جذب تعادلی برای مالاشیت‌گرین 993/33 میلی‌گرم بر گرم است. و مدل­ هم‌دمای تعادلی لانگمویر با ضریب همبستگی 0/9947 مطابقت خوبی با داده ­های تجربی نشان دادند و مطالعات سینتیک بیانگر مطابقت مدل شبه مرتبة دوم برای جاذب مورد بررسی بود. همچنین مطالعات ترمودینامیک جذب نشان دادند که جذب مالاشیت‌گرین توسط نانوکامپوزیت G/Fe3O4 به‌صورت گرماگیر است. بازیابی جاذب سنتزشده طی پنج چرخة متوالی جذب-واجذب توسط حلال متانول انجام شد. بر اساس نتایج حاصل از نانوکامپوزیت سنتز شده در مطالعة حاضر از ظرفیت جذب بسیار بالایی برای جذب مالاشیت‌گرین برخوردار بوده و قابلیت بازیابی و استفادة مجدد این جاذب و بکارگیری آن را در سیستم تصفیة پساب از نظر اقتصادی توجیه ­پذیر می­ نماید.

کلیدواژه‌ها

عنوان مقاله [English]

Adsorption of malachite green from aqueous solutions by magnetic graphene nanocomposite

نویسندگان [English]

  • َAbbas Esmaili 1
  • Nader Bahramifar 2
  • Babak Golzadeh 3
  • Omid Sedaghat 4

1 Department of Decomposition Chemistry, Payame Noor University, Sari Branch, Sari, Iran

2 Department of Environment, Faculty of Natural Resources and Marine Sciences. Tarbiat Modares University. Noor, Iran

3 Department of Chemistry, Payame Noor University, Sari Branch, Sari, , Iran

4 Department of Environment, Faculty of Natural Resources and Marine Sciences. Tarbiat Modares University. Noor, Iran

چکیده [English]

The entry of chemical compounds into the environment is considered a serious threat to humans and other living things. One of these compounds is malachite green, which enters water resources and causes problems for humans and public health. The use of Nano sorbents is a new, high-performance method for removing pollutants from aquatic environments. Graphene, due to its unique properties, is one of the materials that can be used to remove some materials. In this study, graphene was prepared from rice straw residue, which is considered as a waste material, and then magnetized by heat solvent method. SEM, BET, Raman and FTIR analysis were performed to detect and evaluate the properties of the synthesized nanocomposites. The nanocomposite was then investigated to remove malachite green from aqueous solutions in a batch system. Effective factors in adsorption such as pH, adsorbent amount, contact time, initial concentration of malachite green and temperature were investigated. The results showed that the maximum adsorption capacity is 993.33 at concentrations of 50 mg/L and the adsorbent is 5 mg/L for 20 minutes. Also, two types of isothermal adsorption models of Freundlich and Langmuir were investigated and since the correlation coefficient of Langmuir model was higher than Freundlich model. Various models have been developed to evaluate the rate of adsorption process. In this study, pseudo-first-order and pseudo-second-order kinetic models were used. Due to the higher detection coefficient of the pseudo-second-order model, the rate of malachite green adsorption process on G/Fe3O4 was well matched with the pseudo-second-order model. Also, thermodynamic studies showed that the adsorption process is spontaneous and the adsorbent collides with malachite green is random. In this study, four types of solvents were investigated. The adsorption-desorption process was repeated over 5 cycles, with a slight reduction in adsorption capacity and the removal efficiency of malachite green from these steps. Finally, considering the suitable adsorption capacity of the synthesized G/Fe3O4 nanocomposite as well as the adsorption capacity of the adsorbent, it can be concluded that this adsorbent can be a suitable adsorbent for removing malachite green from aqueous solutions.

کلیدواژه‌ها [English]

  • Magnetic graphene
  • Malachite green
  • Nano sorbent
  • Wastewater treatment
  • Kinetic studies
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نشریه محیط زیست طبیعی
دوره 75، شماره 3 - شماره پیاپی 3
شهریور 1401
صفحه 428-444