استخراج پکتین از ضایعات گوجه‌فرنگی به روش فراصوت و بررسی عملکرد پکتین به‌عنوان مهارکننده خوردگی سبز

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه صنعتی نوشیروانی بابل، شهر بابل استان مازندران

2 گروه جداسازی، دانشکده مهندسی شیمی

10.22104/jift.2021.5040.2053

چکیده

این تحقیق با هدف استخراج پکتین از ضایعات گوجه فرنگی به روشی نوین و بررسی اثر ضدخوردگی آن انجام شد. در این راستا استخراج پکتین با امواج فراصوت، تحت شرایط مختلف نوع حلال‌ (هیدروکلریک، اگزالیک و سیتریک اسید)، دمای استخراج (˚C 20، 30 و40) و زمان استخراج (min 10، 20 و30) انجام گردید. بالاترین بازده استخراج با سیتریک اسید و در دمای ˚C40 و زمان min 30 برابر 5/18% به‌دست آمد. درجه استریفیکاسیون، میزان گروه متوکسیل و گالاکتورونیک اسید پکتین تحت شرایط بهینه به‌ترتیب برابر 53، 25 و 45 % اندازه‌گیری شد. جهت بررسی اثر مهارکنندگی خوردگی از نمونه‌ی فولاد کم‌کربن در محلول هیدروکلریک اسید استفاده گردید. مکانیسم عملکرد بازدارندگی توسط آزمون‌های الکتروشیمیایی و روش‌های تحلیل سطحی بررسی شد. آزمون پلاریزاسیون الکتروشیمیایی پس از h1 غوطه‌وری فولاد در محلول M1 اسید حاوی غلظت‌های مختلف پکتین ( w/w % 2، 3 و 4) و در دماهای مختلف (˚C 20، 30 و 40) انجام شد. نتایج نشان داد با افزایش دما از ˚C20 به ˚C40 بازده مهار از 94% به 77% کاهش یافت. همچنین انرژی فعال‌سازی با افزایش غلظت پکتین از w/w %2 به w/w % 4 از 76/1% به 64/0% کاهش یافت. بررسی مورفولوژی و زبری سطح فولاد توسط آنالیزهای میکروسکوپ الکترونی روبشی انتشار میدانی و میکروسکوپ نیروی اتمی نشان داد پکتین روی سطح فولاد جذب شده و لایه‌ای محافظ و پایدار روی آن تشکیل و مانع از خوردگی گردید. نتایج آنالیز طیف‌سنج پراش پرتو ایکس عدم وجود عناصر خورنده روی سطح فولاد و صحت اثر بخشی پکتین در جلوگیری از خوردگی را تأیید نمود. با توجه به نتایج حاصل، پکتین استخراجی می‌تواند به‌عنوان مهارکننده خوردگی سبز معرفی گردد.

چکیده تصویری

استخراج پکتین از ضایعات گوجه‌فرنگی به روش فراصوت و بررسی عملکرد پکتین به‌عنوان مهارکننده خوردگی سبز

تازه های تحقیق

  • ضایعات گوجه‌فرنگی منبع ارزشمندی از پکتین می‌باشد.
  • روش استخراج با امواج فراصوت جهت استخراج پکتین استفاده شد.
  • اثر پارامترهای عملیاتی بر روی بازده استخراج بررسی شد.
  • پکتین استخراج شده به‌عنوان مهارکننده خوردگی سبز استفاده شد.
  • نتایج تست پلاریزاسیون نشان کرد که پکتین استخراج شده به‌عنوان یک نوع بازدارنده مختلط رفتار کرد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Extraction of pectin from tomato wastes by ultrasound assisted method and evaluation of its performance as an ecofriendly corrosion inhibitor

نویسندگان [English]

  • Hoseyn Behroozeh 1
  • Maryam Nikzad 2
  • Ali Asghar Ghoreyshi 2
  • Nazila Kakoui 1
1 Babol Noshirvani University of Technology, Shariati street, Babol, Iran
2 Department of Chemical Engineering, Babol Noshirvani University of Technology
چکیده [English]

This study aimed to extract pectin from tomato waste in a new way and to investigate its anti-corrosion properties. In this regard, pectin using ultrasonic extraction method under different conditions of solvent type, extraction temperature, and extraction time was done. The highest yield was obtained with citric acid at a temperature of 40 ˚C and 30 min equal to 18.5%. The degree of esterification, the amount of methoxyl group, and galacturonic acid of extracted pectin were measured as 53, 25, and 45%, respectively. To evaluate its inhibitory effect on corrosion, a sample of low carbon steel in hydrochloric acid solution was used. The mechanism of inhibition was discussed by electrochemical tests and surface analysis. Electrochemical polarization test was performed after 1 h immersion of carbon steel in 1 M hydrochloric acid containing different concentrations of pectin and at different temperatures. The results showed that with increasing temperature from 20 ˚C to 40 ˚C, the inhibition efficiency decreased from 94% to 77%. Also, the activation energy of corrosion rate decreased with increasing pectin concentration from 2% to 4% w / w from 1.76% to 0.64%. The results of the corrosion potential and current density showed that pectin is a mixture-type inhibitor and its inhibition is due to the geometric blocking of chemical inhibitors adsorbed on the metal surface. In addition, examination of the morphology and roughness of the steel sample surface by field diffusion scanning electron microscopy and atomic force microscopy analyzes showed that pectin was adsorbed on the steel surface and a stable protective layer was formed on the surface to prevent corrosion. The results of element composition analysis by X-ray diffraction spectroscopy showed the absence of corrosive elements on the surface of carbon steel confirmed the effectiveness of pectin in preventing corrosion.

کلیدواژه‌ها [English]

  • Pectin
  • Ultrasonic extraction
  • Tomato waste
  • Anti-corrosion
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