ارزیابی حذف رنگ از محلولهای آبی توسط ستون بستر- ثابت کربن فعال با استفاده از مدل توماس

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیئت‌ علمی گروه بهداشت محیط، مرکز تحقیقات بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی کردستان

2 استادیار گروه بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی همدان

3 استاد گروه شیمی، دانشکده شیمی، دانشگاه بوعلی، همدان

4 دانشیار گروه بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی همدان

چکیده

در این تحقیق، جاذب مورد نیاز برای حذف رنگهای Acid Black1 و Acid Blue 113 با استفاده از فرایند شیمیایی-گرمایی از مخروط درخت کاج تهیه گردید و بعد از تعیین مشخصات شیمیایی و فیزیکی، به‌منظور حذف رنگ مورد استفاده قرار گرفت. مطالعه جذب هر دو رنگ در حالت منقطع به‌منظور تعیین مدل ایزوترمی مطلوب، صورت پذیرفت. همچنین جذب هر دو رنگ در حالت جریان پیوسته با استفاده از ستون بستر ثابت از کربن تولید شده، مطالعه گردید. عملکرد ستون جاذب با تغییر متغیرهای دبی، ارتفاع بستر جاذب و غلظت رنگ ورودی مورد بررسی قرار گرفت. نتایج نشان داد که منحنی‌های شکست ستون به متغیرهای مطالعه شده وابسته است. رفتار ستون جاذب با استفاده از مدل توماس به‌روش غیر خطی، بررسی و پارامترهای مدل تعیین شد. مدل‌های ایزوترمی لانگمیر و فروندلیچ به‌منظور بررسی تعادل جذب، مورد استفاده قرار گرفتند. نتایج این مطالعه نشان داد که جذب هر دو رنگ توسط جاذب، از مدل ایزوترمی لانگمیر تبعیت می‌کند. همچنین مدل توماس توانست به نحو قابل قبولی رفتار جذب رنگهای مورد مطالعه را توصیف کند. مقادیر ظرفیت ستون در جذب هر رنگ با مقادیر ظرفیت ایزوترمی آن مقایسه گردید.
 
 

کلیدواژه‌ها


عنوان مقاله [English]

Using Thomas Model to Evaluate Dye Removal from Aqueous Solutions in Fixed-bed Columns of Activated Carbon

نویسندگان [English]

  • Mahdi Hadi 1
  • Mohammad Reza Samarghandi 2
  • Saeed Azizian 3
  • Mohammad Taghi Samadi 4
  • Reza Shokoohi 2
  • Alireza Rahmani 4
1 Faculty Member of Environmental Health, Enironmental Health Research Center, Faculty of Public Health, Kordestan University of Medical Sciences
2 Assist. Prof. of Environmental Health, Faculty of Public Health, Hamadan University of Medical Sciences, Hamedan
3 Prof., Dept. of Chemistry, Bu-Ali University, Hamedan
4 Assoc. Prof. of Environmental Health, Faculty of Public Health, Hamedan University of Medical Sciences, Hamedan
چکیده [English]

For the purposes of this study, activated carbon was derived from pine-cone by a chemical-thermal process. Initially, its chemical and physical properties were determined before it was used for the removal of Acid Black 1 and Acid Blue 113 dyes. A batch sorption study was carried out in order to obtain the optimum isotherm model. The monolayer maximum saturation capacities of AB1 and AB113 dyes based on Langmuir isotherm model were determined to be 458 mg dye/g carbon and 286 mg dye/g carbon, respectively. Adsorption of dyes was also studied in a continuous-flow state using a fixed-bed column of activated carbon. The effects of operating variables such as flow rate, bed depth, and dye concentration on the column operation were studied. Data confirmed that the breakthrough curves depended on flow rate, bed depth, and initial dye concentration. Column behavior was investigated using Thomas Model and model parameters were determined by a non-linear regression method. The Langmuir and Freundlich isotherm models were used to fit the experimental data. The best fit of the adsorption isotherm data was obtained using the Langmuir model for both dyes. The results showed that Thomas Model was suitable for the description of breakthrough curves under the experimental condition. The column adsorption capacity was also compared with equilibrium adsorption capacities for each dye.
 
 

کلیدواژه‌ها [English]

  • Dye adsorption
  • Fixed –Bed Column
  • Thomas Model
  • Acidic Dyes
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