امواج ماکروویو به‌عنوان یک منبع انرژی کارآمد، قابل کنترل و ارزان برای اصلاح ساختار و شیمی‌سطح جاذب کربن فعال؛ حذف موثر کنگو رد از پساب‌های صنعتی

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه شیمی، دانشکده علوم پایه، واحد سنندج، دانشگاه آزاد اسلامی، سنندج، ایران، صندوق پستی: 6616935391.

10.30509/jcst.2024.167315.1228

چکیده

در این مطالعه کارایی امواج ماکروویو به عنوان یک روش سریع با قابلیت کنترل بالا برای اصلاح ساختار جاذب کربن فعال (AC) بررسی گردید. پوست گردو بو‌می‌منطقه کامیاران به عنوان ماده خام استفاده شد. جاذب به روش فعال‌سازی شیمیایی توسط ZnCl2 با برنامه دمایی مشخص تهیه گردید. امواج ماکروویو با توان‌های 200، 400 و 600 وات به مدت زمان یک دقیقه اعمال و سه نمونه جاذب AC-200، AC-400 وAC-600  تولید شدند. خصوصیات ساختاری جاذب‌ها با روش‌های آنالیز عنصری، SEM، FT-IR و BET بررسی شد. تصاویر SEM و طیف‌های FT-IR تغییر در ریخت و شیمی‌سطح جاذب را اثبات نمود. طی یک مطالعه مقایسه‌ای از AC و AC-400 برای حذف کنگو رد استفاده شد. متغیرهای زمان تماس، مقدار جاذب، غلظت اولیه رنگزا و pH محلول بهینه گردیدند. در شرایط بهینه میزان حذف رنگزا توسط AC و AC-400 در سطح غلطتیmg/l  130 به ترتیب 61.38 و 94.36 درصد حاصل شد. مطالعات سینیتیکی و ایزوتر‌می‌پیروی فرایند حذف رنگزا از مدل شبه درجه دوم و فروندلیچ را نشان داد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Microwaves as an Efficient, Controllable and Low-Cost Energy Source for Modifying the Structure and Surface Chemistry of Activated Carbon Adsorbent; Effective Removal of Congo Red from Industrial Wastewaters

نویسندگان [English]

  • Bahram Ebrahimi
  • Sirwan Mohammadiazar
Department of Chemistry, Faculty of Sciences, Sanandaj Branch, Islamic Azad University, P.O. Box: 6616935391, Sanandaj, Iran.
چکیده [English]

This study investigated the effectiveness of microwaves as a fast and highly controllable method to modify the structure of activated carbon (AC) absorbent. The endemic walnut shell of the Kamyaran region was used as raw material. The adsorbent was prepared by chemical activation by ZnCl2 with a specific temperature program. Microwaves with 200, 400, and 600 watts powers were applied for one minute, and three adsorbent samples, AC-200, AC-400, and AC-600, were produced. The structural characteristics of the adsorbents were investigated by elemental analysis, SEM, FT-IR, and BET methods. SEM images and FT-IR spectra proved the change in the morphology and surface chemistry of the absorbents. AC and AC-400 were used to remove congo red during a comparative study. The variables of contact time, adsorbent dosage, initial dye concentration, and the pH of the dye solution were optimized. In optimal conditions, the dye removal by AC and AC-400 at 130 mg/L was 61.38 and 94.36%, respectively. Kinetic and isotherm studies showed that the dye removal process follows the pseudo-second-order and Freundlich models.

کلیدواژه‌ها [English]

  • Walnut shell
  • Congo red
  • Modified adsorbent
  • Activated carbon
  • Microwaves

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