بررسی کارایی زغال زیستی اصلاح شده با منیزیم کلرید در حذف نیترات از محلول آبی: مطالعه سینتیک و همدمای جذب

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش آموخته دکتری علوم خاک، گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز

2 دانشگاه شهید چمران اهواز، دانشکده کشاورزی، گروه علوم و مهندسی خاک

3 ستادیار گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز

4 استادیار گروه شیمی، دانشکده علوم، دانشگاه شهید چمران اهواز، اهواز، ایران

چکیده

چکیده
اصلاح زغال زیستی با هدف بهبود ساختار منافذ، افزایش سطح ویژه، گروه­های عاملی و کاهش محدودیت زغال زیستی اولیه در جذب آلاینده­ها صورت می­گیرد. این پژوهش نیز به منظور بررسی کارایی زغال زیستی ذرت اصلاح شده در جذب نیترات از محلول آبی انجام شد. بدین منظور زغال‌های زیستی از بقایای ذرت و بقایای ذرت اصلاح شده با منیزیم کلرید (MgCl2) در دمای 500 درجه سلسیوس تهیه شدند و ویژگی­های شیمیایی و فیزیکی آن­ها اندازه­گیری شد.آزمایش­های جذب سطحی به‌صورت پیمانه­ای انجام شد و تأثیر عوامل مؤثر بر فرآیند جذب نیترات توسط  زغال‌های زیستی شامل غلظت اولیه، زمان تماس و pH بررسی شد. بررسی ویژگی­های دو نوع زغال زیستی نشان داد، با اصلاح شیمیایی زغال زیستی عملکرد، pH، سطح ویژه، ظرفیت تبادل کاتیونی، ظرفیت تبادل آنیونی، محتوای اکسیژن، نسبت H/C و O/C افزایش یافت، در حالی که محتوای کربن و نسبت C/N کاهش یافت. نتایج جذب نیترات نشان داد فرآیند جذب در هر دو زغال زیستی پس از گذشت 480 دقیقه به تعادل رسید. مقدار pH بهینه در حذف نیترات سه بود. نتایج نشان داد که اصلاح شیمیایی زغال زیستی سبب افزایش ظرفیت جذب نیترات شده و حداکثر جذب نیترات به وسیله زغال زیستی تهیه شده از بقایای ذرت و زغال زیستی اصلاح شده به ترتیب 72/51 و 18/72 میلی­گرم بر گرم برآورد شد. مدل لانگ­مویر بهترین برازش را برای داده­های هر دو نوع زغال زیستی نشان داد. همچنین فرآیند جذب نیترات با مدل سینتیکی شبه مرتبه دوم قابل توصیف بود. به­طور کلی نتایج این پژوهش نشان داد اصلاح زغال زیستی ذرت با MgCl2می­تواند سبب بهبود ویژگی­های فیزیکی و شیمیایی و افزایش ظرفیت جذب نیترات از محلول­های آبی گردد. بنابراین زغال زیستی ذرت اصلاح شده با MgCl2، می­تواند جاذب مناسبی برای پالایش منابع آبی آلوده به آلاینده­های معدنی از جمله نیترات باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Modified Biochar Performance on Nitrate Removal from Aqueous Solution: Kinetic and Isotherm Study

نویسندگان [English]

  • Shila Khajavi-Shojaei 1
  • abdolamir moezzi 2
  • Mojtaba Norouzi Masir 3
  • Mehdi Taghavi 4
1 Geaduated Ph.D Student of Soil Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz
2 shahid chamran university of ahvaz, faculty of agriculture, department of soil science
3 Assistant Professor, Department of Soil Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
4 Assistant Professor, Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
چکیده [English]

Abstract
Biochar modification is performed to improve the structure of pores, increase the specific surface area, functional groups, and reduction of raw biochar limits in absorption of pollutants. This study was conducted to evaluate the efficiency of corn stover modified biochar in adsorption of nitrate from aqueous solution. For this purpose, corn stover biochar (BC) and chemically modified corn stover biochar with MgCl2 (Mg-BC) was prepared at 500°C and its physico-chemical characteristics were measured. Adsorption batch experiments were carried. Effects of initial concentration of nitrate, contact time and pH on adsorption capacity mechanism were studied. The study of the characteristics of the two types of biochar showed that by the chemical modification of corn stover, enhanced yields, pH, surface area, cation exchange capacity and anion exchange capacity, oxygen content, H/C and O/C ratio, while decreased carbon content and C/N ratio. Adsorption of nitrate by both biochar reached to equilibrium after 480. The optimal pH for removal of nitrate was 3. The results demonstrated that chemical modification of biochar enhanced nitrate adsorption and maximum nitrate adoption by BC and Mg-BC was 51.72 and 72.18, respectively. Langmuir isotherm showed the best fit for nitrate in both biochars. The pseudo second order kinetic model also provided a good description for the adsorption process nitrate.Generally, result of present study revealed that modification of biochar could improve physico-chemical and adsorption capacity of nitrate from aqueous solution. Therefore, MgCl2 modified biochar could be a suitable absorbent for purifying water resources which contaminated by inorganic pollutants, including nitrate.

کلیدواژه‌ها [English]

  • Adsorption
  • Agricultural waste
  • Chemical modification
  • Organic adsorbents
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