مطالعه اسپکتروفوتومتری سینتیک تخریب فوتوالکتروکاتالیستی 4-نیتروفنول بر مبنای الکترود TiO2-MWCNT/Ti با استفاده از روش تفکیک منحنی چند متغییره- حداقل مربعات متناوب

نوع مقاله : مقاله علمی پژوهشی

نویسندگان

1 دانشکده شیمی، دانشگاه سمنان، سمنان، ایران

2 گروه ایمنی و کنترل کیفیت مواد غذایی، موسسه پژوهشی علوم و صنایع غذایی، مشهد، ایران

چکیده

در این تحقیق، نانوکامپوزیت TiO2-MWCNT بر روی الکترود تیتانیوم با بکارگیری روش لایه نشانی الکتروفورتیک ( (EPD پوشش‌دهی شده است. با استفاده از تکنیک SEM تایید شد که نانوذرات بصورت یکنواخت بر روی تمام سطح تیتانیوم پوشش‌دهی شده‌اند. الکترود اصلاح شده بعنوان آند در تخریب آلاینده‌ 4-نیتروفنول با استفاده از فرآیند فوتوالکتروکاتالیست بکار گرفته شد. سینتیک فرآیند تخریب آنالیت توسط روش اسپکتروفوتومتری ارزیابی گردید. فرآیند تخریب 4-نیتروفنول با روش‌های فوتوکاتالیست (PC)، الکتروشیمیایی(EC) و فوتوالکتروکاتالیست(PEC) بررسی شد. نتایج نشان داد که فرایند EC بسیار کند بود و در داده های جمع آوری شده برای دوفرایند دیگر به دلیل همپوشانی طیفی اجزاء درگیر در سینتیک امکان استخراج پروفایل سینتیک تخریب 4- نیتروفنول وجود داشت که برای غلبه بر این مشکل، روش تفکیک منحنی چند متغییره- حداقل مربعات متناوب (MCR-ALS) برای غلبه بر این مشکل استفاده شد. در پایان پروفایل سینتیک و طیف های خالص اجزاء به دست آمدند و کارآیی روش‌های استفاده شده در تخریب آلاینده بدین ترتیب بود PEC>PC>EC .

کلیدواژه‌ها


عنوان مقاله [English]

Spectrophotometric Study of Photo-electro-catalytic Degradation of 4- Nitrophenol on TiO2-MWCNT/Ti Electrode Using Multivariate Cure Resolution-Alternating Least Squares Method

نویسندگان [English]

  • Fatemeh Chitgaran 1
  • S. Maryam Sajjadi 1
  • Farideh Nabizadeh Chianeh 1
  • Javad Feizy 2
1 Faculty of Chemistry, Semnan University, Semnan, Iran
2 Department of Food Safety and Quality Control, Research Institute of Food Science and Technology, Mashhad, Iran
چکیده [English]

In this study, TiO2-MWCNT nanoparticles were deposited on Ti electrode by electrophoretic deposition (EPD) method. Scanning electron microscopy method verified that TiO2-MWCNT were deposited on Ti homogeneously. The Modified electrode was employed as an anode for the degradation of 4-nitorohenol pollutant that monitored spectroscopically. The degradation process of this contaminant was investigated by photo-catalytic (PC), electro-chemical (EC) and photo-electro-catalytic (PEC) methods. The results revealed that PC process was highly slow and there was signal overlapping for the components involved in two other processes, a fact which prevents extracting the kinetic profile of 4-nitrophenol. To overcome this problem, it was proposed to use multivariate cure resolution-alternating least squares (MCR-ALS) method for data analysis. Finally, the pure kinetic and spectral profiles of components were obtained using MCR-ALS method and the efficiencies of the applied degradation methods are ranked as follows: PEC>EC>PC.

کلیدواژه‌ها [English]

  • TiO2-MWCNT/Ti electrode
  • electrophoretic deposition (EPD)
  • photo-electro-catalyst
  • Chemometrics
  • MCR-ALS
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