مطالعه طیفی، ساختاری و شیمیایی هیومیک اسیدهای استخراج‌شده از زغال‌سنگ‌های معادن ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مربی و عضو هیئت علمی/ گروه مهندسی فن‌آوری صنایع غذایی، پردیس ابوریحان، دانشگاه تهران

2 دانش‌آموخته کارشناسی ارشد مهندسی مکانیک بیوسیستم، گروه مهندسی فنی کشاورزی، پردیس ابوریحان، دانشگاه تهران

3 استاد، گروه مهندسی فنی کشاورزی، پردیس ابوریحان، دانشگاه تهران

چکیده

به دلیل تأثیر و اهمیت­ مواد هیومیکی در انواع فرآیند­های زیست­محیطی، آگاهی و دانش از خصوصیات شیمیایی، طیفی و ساختاری این مواد، جنبه­هایی هستند که همیشه باید در مطالعات وابسته به مدیریت و پالایش اکوسیستم­ها درنظر گرفته شوند. در این پژوهش، پس از استخراج و پالایش هیومیک اسید از زغال­سنگ­های معادن ایران، از تکنیک گراویمتری برای تعیین درجه خلوص، از طیف­سنجی­های غیرمخرب مانند FT-IR، UV-VIS، ICP-OES و  CHNOS برای سنجش کیفی و کمی و همچنین از ریزنگاره­های SEM برای مطالعه ساختاری هیومیک اسید استفاده شد و نتایج بدست­آمده با نمونه هیومیک اسید استاندارد آلدریچ مقایسه شدند. نتایج آزمون گراویمتری نشان داد که درجه تخلیص هیومیک ­اسید تولیدشده 98 درصد است. از نظر کمی، نتایج آنالیز عنصری ICP-OES نشان دادند که بعد از پالایش هیومیک اسید، غلظت انواع فلزات سنگین در هیومیک اسید خیلی کمتر از محدوده مجاز پیشنهادشده هستند و گستره­ای از عناصر ماکرو و میکرومغذی در ساختار هیومیک اسید وجود دارند. همچنین نتایج کیفی آنالیزهای FT-IR، UV-VIS و SEM به خوبی حضور یک ساختار غالب آروماتیک و غنی از گروه­های عاملی کربوکسیلی و فنولی با درجه هیومیفیکاسیون و فشردگی بالا و نوع A با سطوح اسفنجی­مانند نرم و متخلخل ناهمگن را در هیومیک اسید نشان دادند. نتایج آنالیز CHNOS نیز علاوه بر تائید مناسب بودن زغال­سنگ استفاده­شده جهت استخراج هیومیک­اسید، محصول تولیدی را منطبق بر نمونه­ استاندارد هیومیک اسید نشان می­دهد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Study of Spectral, Structural and Chemical characteristics of Humic Acids Isolated from Coalfield of Iran

نویسندگان [English]

  • Ali sharif paghaleh 1
  • Ehsan Sarlaki 2
  • Mohamadhosein Kianmehr 3
  • Nima Shakiba 2
1 Associate Professor/ Department of Food Technology Engineering, College of Abouraihan, University of Tehran
2 M.Sc. graduated of Mechanical Engineering of Biosystems, Department of Agro-technology Engineering, College of Abouraihan, University of Tehran
3 Professor, Department of Agro-technology Engineering, College of Abouraihan, University of Tehran
چکیده [English]

Due to the significant impact of humic substances on a variety of environmental processes, knowing the chemical, spectroscopic and structural features of these substances should always be considered in studies related to the management and remediation of the impacted ecosystems. In this study, after the extraction and purification of Humic Acid (HA) from low grade coals of mines of IRAN, the gravimetric technic was used in order to determine the degree of purity of HA from non-destructive spectroscopies such as ICP-OES, UV-VIS, FT-IR and CHNOS for measuring the quality and quantity of HA. Also, microstructures of SEM were used in order to study the structure of HA; then the obtained results were compared with standard Aldrich HA. The results of the gravimetric analysis showed that the produced HA had a 98% degree of purification. Also, from the view of quantity, the results of elemental analysis of ICP-OES indicated that after the purification of HA, the concentration of various heavy metals in HA are lower than the recommended safety limit and there is a range of both macronutrients and micronutrients in the structure of HA. Moreover, the quality results of FT-IR, UV-VIS and SEM analysis have shown the presence of an aromatic predominant structure, rich in carboxylic and phenolic functional groups with high humification and condensation degrees, and type A with a loose spongy and heterogeneous porous surfaces for HA. The CHNOS analysis also confirmed the suitability of the coal used to extract HA, and showed that the final product matches the standard HA results.

کلیدواژه‌ها [English]

  • Characterization
  • Coal
  • Humic Acid
  • Spectroscopy
  • Structure

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تحقیقات آب و خاک ایران
دوره 48، شماره 5
بهمن و اسفند
بهمن 1396
صفحه 1145-1158

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