تأثیر بیوچار تفاله پسته بر جذب سطحی فلوراید در محلول آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم خاک دانشگاه شهید باهنر کرمان ایران

2 گروه علوم خاک، دانشگاه شهید باهنر کرمان، کرمان، ایران

3 گروه علوم و مهندسی خاک، دانشگاه شهید باهنر کرمان

چکیده

ﻓﻠﻮراﯾﺪ و ﺗﺮﮐﯿﺒﺎت آن ﺑﻪ ﺷﮑﻞ ﮔﺴﺘﺮده‌ای در ﺻﻨﺎﯾﻊ ﻣﻮرد اﺳﺘﻔﺎده ﻗﺮار ﻣﯽ‌ﮔﯿﺮد ﮐﻪ از ﻃﺮﯾﻖ ﭘﺴـﺎب ﺑـﻪ ﻣﺤﯿﻂ زﯾﺴﺖ ﻣﻨﺘﺸﺮ ﻣﯽ‌ﺷﻮد. یکی از روش‌های حذف فلوراید، جذب سطحی با استفاده از جاذب‌های ارزان قیمت است. ﻫﺪف از اﯾﻦ ﺗﺤﻘﯿﻖ ﺑﺮرﺳﯽ ﮐﺎراﯾﯽ اﺳﺘﻔﺎده از بیوچار تفاله پسته در ﺣـﺬف ﻓﻠﻮراﯾـﺪ از ﻣﺤﯿﻂ‌ﻫﺎی آﺑﯽ ﻣﯽ‌ﺑﺎﺷﺪ. در این پژوهش بیوچار تفاله پسته از طریق گرماکافت در دمای ˚C600 به مدت 3 ساعت با نرخ افزایش دمای 25 درجه سانتی‌گراد بر دقیقه تهیه شد. به منظور تعیین هم دماهای جذب سطحی،20 میلی­لیتر محلول فلوراید با غلظت­های مختلف (صفر،3، 6 و 9 میلی­گرم بر لیتر) از نمک NaF به 5/0 گرم بیوچار اضافه شد و سپس نمونه‌ها به مدت 24 ساعت تکان داده شدند و در نهایت مدل‌های هم­دمای لانگمیر، فروندلیچ و تمکین بر داد­های جذب برازش داده شدند. به منظور بررسی اثر زمان بر جذب سطحی فلوراید،20 میلی­لیتر محلول فلوراید با غلظت­های اولیه 3، 6 و 9 میلی­گرم بر لیتر به 5/0 گرم از بیوچار اضافه شد و نمونه‌ها در فاصله زمانی (15، 30، 45، 60، 90،75، 105، 120، 135، 165، 180، 195، 210 ،225 و 240 دقیقه) تکان داده شدند. سپس غلظت فلوراید اندازه­گیری شد. نتایج نشان داد که با افزایش زمان تماس درصد جذب فلوراید به وسیله بیوچار افزایش یافته است و پس از گذشت 240 دقیقه برای غلظت­های 3، 6 و 9 میلی­گرم بر لیتر به ترتیب 89/70، 05/63 و 66/54 درصد بدست آمد. مدل­های شبه مرتبه اول و شبه مرتبه دوم نسبت به سایر مدل­ها، بعنوان بهترین رابطه سینتیک جذب سطحی فلوراید معرفی شدند. نتایج برازش داده­های به دست آمده با مدل­های هم دمای جذب سطحی لانگمیر، فروندلیچ و تمکین نشان داد که مدل لانگمویر توصیف بهتری از فرآیند جذب فلوراید بوسیله بیوچار ارائه می‌نماید. حداکثر جذب فلوراید )  mg kg-1 (306 توسط بیوچار از مدل لانگمویر بدست آمد.

کلیدواژه‌ها


عنوان مقاله [English]

The Effect of Pistachio Pulp Biochar on the Adsorption of Fluoride in Aqueous Solution

نویسندگان [English]

  • abolfazl khademi Jolgenejad 1
  • majid fekri 2
  • Majid Mahmoodabadi 3
1 M.Sc. Student, Department of Soil Science, Agriculture Faculty, Shahid Bahonar University of Kerman. Iran.
2 Department of soil science,agriculture faculty. shahid bahonar university of kerman
3 Department of Soil Science, Agriculture Faculty, Shahid Bahonar University of Kerman
چکیده [English]

Fluoride is widely used in industries and release to the environment via their effluents. One method of fluoride removal is adsorption using inexpensive adsorbents. The purpose of this sturdy was to compare the efficiency of pistachio pulp biochar in fluoride removal from water.In this study, pistachio pulp biochar was produced through pyrolysis at 600 °C for 3 hours with a heating rate of 25 °C min-1. To determine the adsorption isotherms, 20 mL of fluoride solution with different concentrations (zero, 3, 6 and 9 mg L-1) of NaF salt was added to 0.5 g biochar and then the samples were shaken for 24 hours and finally the adsorption data were fitted to Langmuir, Freundlich and Temkin isotherm models. In order to investigate the effect of time on fluoride adsorption, 20 ml of fluoride solution with initial concentrations of  3, 6 and 9 mg L-1 was added to 0.5 g biochar and samples were shaken for different times (15, 30 , 45, 60, 90,75, 105, 120, 135, 165, 180, 195, 210, 225 and 240 minutes). Then, the concentration of Fluoride was measured. The results showed with increasing the retention time, the percentage of fluoride adsorption by biochar increased and after 240 minutes for concentrations of 3, 6 and 9 mg L-1 were obtained 70.89, 63.05 and 54.66, respectively. The pseudo-first-order and pseudo-second-order models were introduced as the best kinetic models of fluoride adsorption compared to other models. The results of fitting data to the Langmuir, Freundlich and Temkin isotherm models showed that Langmuir model provides a better description of the fluoride adsorption process by biochar. The maximum fluoride adsorption (306 mg kg-1) was obtained by biochar from the Langmuir model.

کلیدواژه‌ها [English]

  • Biochar
  • Adsorption
  • kinetic
  • fluoride
  • Isotherm
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