نشریه محیط زیست طبیعی

حذف رنگ از پساب نساجی به‌وسیلۀ نانوالیاف دی‌اکسید تیتانیوم، فریت کبالت و دی‌اکسید تیتانیوم/ فریت کبالت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری گروه نساجی، واحد یزد، دانشگاه آزاد اسلامی، یزد، ایران

2 استادیار گروه نساجی، واحد یزد، دانشگاه آزاد اسلامی، یزد، ایران

3 استاد گروه نساجی، واحد یزد، دانشگاه آزاد اسلامی، یزد، ایران

چکیده

استفادۀ روزافزون از انواع رنگ‌زا و آلودگی پساب حاوی مواد رنگ‌زا از مشکلات مهم محیط زیست است. روش‌های گوناگونی برای تصفیۀ پساب‌های حاوی مواد رنگ‌زا بررسی شده است. در این پژوهش، نانوالیاف دی‌اکسید تیتانیوم، فریت کبالت و دی‌اکسید تیتانیوم/ فریت کبالت با استفاده از روش الکتروریسی تهیه و اثر تغییر ولتاژ و فاصلۀ الکتروریسی بر قطر و ریخت‌شناسی نانوالیاف بررسی شد. نمونه‌های نانوالیاف تهیه‌شده به‌عنوان جاذب برای رنگبری پساب‌های حاوی مواد رنگ مستقیم قرمز 80 استفاده شد. اثر پارامترهای مختلف مانند مقدار جاذب، غلظت رنگ‌زا و pH بر درصد بازده رنگبری بررسی شد. خواص ساختاری و نوری نانوالیاف تهیه‌شده به‌وسیلۀ میکروسکوپ الکترونی روبشی، الگوی پراش پرتو ایکس و آزمون تعیین سطح ویژه مشخصه‌یابی شد و طیف‌سنج فرابنفش- مرئی (UV-Vis) به‌منظور بررسی حذف رنگ از محلول رنگی استفاده شد. تصاویر SEM به‌دست‌آمده نشان داد که در فرایند الکتروریسی در ولتاژ 18 کیلوولت، همۀ نمونه‌های نانوالیاف بدون هیچ نقصی تشکیل شدند و با افزایش فاصلۀ الکتروریسی، قطر نانوالیاف کاهش یافت. نتایج حاصل از XRD نشان می‌دهد که نانوساختارهای تهیه‌شده پس از عملیات حرارتی دارای ساختاری با فاز غالب بلوری است. نتایج BET نشان داد که سرعت تخریب رنگ k در نانوالیاف دی‌اکسید تیتانیوم/ فریت کبالت برابر با ppm/h 45/93 است که از دو نمونۀ دیگر به‌مراتب بهتر است. با توجه ‌به نتایج به‌دست‌آمده بازده حذف رنگ نانوالیاف دی‌اکسید تیتانیوم/ فریت کبالت با افزایش الکترون- حفره نسبت به نانوالیاف دی‌اکسید تیتانیوم و فریت کبالت به‌مراتب بهتر و رنگبری بیشتری در محلول رنگی داشت.

کلیدواژه‌ها

عنوان مقاله [English]

Removal of dye from textile effluent by titanium dioxide, ferrite cobalt, and titanium dioxide/ferrite cobalt nanofibers

نویسندگان [English]

  • Seyed Soheil Yasini Ardakani 1
  • ramin abghari 2
  • Mohammad Mirjalili 3

1 PhD student of Textile, Yazd Branch, Islamic Azad University, Yazd, Iran

2 Assistant Professor of Textile , Yazd Branch, Islamic Azad University, Yazd, Iran

3 Professor of Textile , Yazd Branch, Islamic Azad University, Yazd, Iran

چکیده [English]

Increasing use of dyes and pollution with containing dyes is one of the major environmental problems and, various methods for the treatment of effluents containing dyes have been investigated. In this study, TiO2, CoFe2O4 and TiO2/CoFe2O4 nanofibers were prepared using electrospinning process and the effect of voltage and electrospinning distance on the diameter and morphology of nanofibers were investigated. Samples of prepared nanofiber were used as adsorbents for decolonization of effluents containing direct and red 80 dyes. The effect of various parameters such as the content of adsorbent, dye concentration and pH on the decolonization efficiency was investigated. Structural and optical properties of prepared nanofibers were characterized by scanning electron microscopy (SEM), X-ray diffraction pattern (XRD), specific surface determination test (BET) and, UV-Vis spectroscopy has been used to study the adsorption of dyes. The obtained SEM images showed that the average diameter of all three prepared nanofiber samples of TiO2, CoFe2O4 and TiO2 / CoFe2O4 is less than 100 nm. The results of XRD show that the nanostructures prepared after heat treatment have a structure with a crystalline dominant phase. BET results show that the dye degradation rate k in TiO2/CoFe2O4 nanofibers is 93.45 (ppm/h), which is much better than the other two nanofibers. The results show that the dye degradation efficiency of TiO2/CoFe2O4 nanofibers was much better than TiO2 and CoFe2O4.

کلیدواژه‌ها [English]

  • Direct Red 80
  • Electrospinning process
  • Electron-hole
  • Photocatlytic
  • Removal of pollution environmental
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نشریه محیط زیست طبیعی
دوره 74، شماره 2
شهریور 1400
صفحه 250-263