حذف منگنز از محیط آبی توسط زئولیت کلینوپتیلولایت در حضور یون‌های آهن، کروم و آلومینیوم

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشیار گروه مهندسی آب، دانشکده کشاورزی

2 دانشجوی کارشناسی ارشد گروه مهندسی آب، دانشکده کشاورزی، دانشگاه زابل

چکیده

هدف اصلی این تحقیق مقایسه مقدار جذب منگنز توسط زئولیت کلینوپتیلولایت در دو حالت محلول تک‌عنصری و محلول ترکیبی بود. برای این کار از زئولیت معادن سمنان با قطر ذرات 350 میکرومتر استفاده گردید. نتایج نشان داد که pH بهینه در هر دو حالت تک‌عنصری و حالت ترکیبی برابر5 است. نتایج برازش مدل‌های لاگرگرن، هو و همکاران و اورامی بر داده‌های سینیتیک نشان داد که در هر دو حالت تک‌عنصری و حالت ترکیبی، مدل اورامی به‌‌ترتیب با ضریب همبستگی 99/8 و 99/9 درصد داده‌ها را بهتر توصیف می‌نماید. سرعت متوسط جذب منگنز برای محلول تک‌عنصری و ترکیبی به‌ترتیب 0/0242 و 0/0146 میلی‌گرم بر گرم بر دقیقه به‌دست آمد. همچنین مقایسه فاکتور خطا نشان داد که مدل اورامی برای هر دو حالت تک‌عنصری و حالت ترکیبی دارای کمترین خطا به‌ترتیب 0/0248 و 0/0166 بود. مقایسه مدل‌های لانگمیر، فروندلیچ، سیپس و رادلیچ- پترسون نشان داد که مدل سیپس با ضریب تعیین 99/8 و 99/3 درصد و فاکتور خطای 0/0055 و 0/0051 به‌ترتیب داده‌های سیستم تک‌عنصری و ترکیبی را بهتر از سایر مدل‌ها توصیف می‌نماید. ظرفیت جذب منگنز در دو حالت تک‌عنصری و حالت ترکیبی به‌ترتیب 3/67 و 2/63 میلی‌گرم برگرم به‌دست آمد. برای اندازه‌گیری سطح ویژه از روش جذب متیلن بلو استفاده شد و نتایج نشان داد که سطح ویژه زئولیت 12/31 مترمربع به ازای هر گرم است.

کلیدواژه‌ها


عنوان مقاله [English]

Removal of Manganese from Aqueous Solution by Natural Zeolite in the Presence of Iron, Chrome and Aluminum Ions

نویسندگان [English]

  • shayan shamohamadi 1
  • adel Isfahani 2
1 Assoc. Prof. of Water Eng., College of Agriculture, Shahrekork Univerisity, Shahrekord
2 M.Sc. Student of Water Eng., College of Agriculture, Zabol University, Zabol
چکیده [English]

The main purpose of this study is removal efficiency of Clinoptilolite (zeolite) in absorption of manganese in the two modes of single and compound element in solution. The zeolite used in this study was provided from Semnan mines with particle size of 350 mm. The results showed that the optimum pH of both single and compound modes was 5. The kinetics data were analyzed by Lagergrn, Ho et al and Avrami models in the both modes (single and compound). It was found that the data can be expressed satisfactorily by Avrami model. The determination coefficient for Avrami model in both single and compound modes were 0.998 and 0.999 respectively. Also the average absorption rate for manganese in two modes were 0.242 mg/g. min and 0.0146 mg/g. min respectively. Langmuir, Frondlich, Sip's and Radlich-Patterson models were also used in this study. The results showed that Sip's model with determination coefficient of 0.998 and 0.993 and error of 0.0248 and 0.0166 for both single and compound modes respectively, was more reliable for expressing the data than others. The Manganese absorption capacity for single and compound modes were 3.67 mg/g and 2.63 mg/g respectively. The surface area of Zeolite was measured using the methylene blue absorption method and was found 12.31m2/g.

کلیدواژه‌ها [English]

  • Adsorption
  • Zeolite (Clinoptilolite)
  • manganese
  • Fe(II)
  • Cr(VI)
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