بررسی سینیتیکی واکنش نانوفتوکاتالیستی (ZnO-Ag-Zr) در تخریب مواد رنگزای قرمز ری اکتیو (RR198)

نوع مقاله : مقاله علمی پژوهشی

نویسندگان

دانشگاه سمنان

چکیده

در این تحقیق ابتدا راکتور فتوکاتالیستی از جنس کوارتز طراحی و ساخته شد. سپس نانوفتوکاتالیست های ZnO اصلاح شده با درصدهای مختلفی از Ag و Zr به روش احتراقی وبا استفاده از ماکروویو سنتز گردید. آزمایش ها ی فتوکاتالیستی نشان داد که نانوفتوکاتالیست های با نسبت جرمی 0.093 Ag و 0.04 Zr کارامد تر است. ویژگی های این کاتالیست توسط آنالیزهای XRD، SEM وFT-IR مورد ارزیابی قرار گرفت. سپس فعالیت های فتوکاتالیستی ZnO-Ag-Zr در تخریب رنگ قرمز ری اکتیو 198 مورد بررسی قرار گرفت و عوامل موثر مانند pH محلول ، مقدار کاتالیست و غلظت اولیه محلول بررسی شد. آزمایش ها نشان داد که شرایط بهینه رنگبری از رنگزا در غلظت 20 میلی گرم در لیتر عبارت است از: pH=10 و میزان کاتالیست 0.3 گرم در لیتر و در این شرایط رنگبری بالای 92 درصد می باشد. همچنین در بررسی سینتیک واکنش مذکور نشان داد که سرعت حذف مواد رنگزای قرمز ری اکتیو 198 همخوانی مناسبی با معادله شبه درجه یک لانگمیر-هینشلوود دارد و لذا پارامترهای سینتیکی با استفاده از این مدل تعیین گردید.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Kinetic investigation of nanophotocatalytic reaction (ZnO-Ag-Zr) in the degradation of reactive red dyes (RR198)

نویسندگان [English]

  • Mansour Jahangiri
  • omid tavakoly
  • Mobina alimohammady
چکیده [English]

In this research, a photocatalytic reactor made of quartz was designed and built. Then ZnO nanophotocatalysts modified with different percentages of Ag and Zr were synthesized by combustion method and using microwave. Photocatalytic experiments showed that nanophotocatalysts with a mass ratio of 0.093 Ag and 0.04 Zr are more efficient. The characteristics of this catalyst were evaluated by XRD, SEM and FT-IR analyses. Then the photocatalytic activities of ZnO-Ag-Zr in the degradation of reactive red dye 198 were investigated and the effective factors such as pH of the solution, amount of catalyst and initial concentration of the solution were investigated. Experiments showed that the optimal conditions for decolorization of the dye at a concentration of 20 mg/liter are: pH=10 and the amount of catalyst is 0.3 g/liter, and under these conditions, decolorization is above 92%. Also, in the study of the kinetics of the aforementioned reaction, it was shown that the removal rate of Reactive Red 198 dyes is in good agreement with the pseudo-first-order Langmuir-Hinshelwood equation, and therefore, the kinetic parameters were determined using this model.

کلیدواژه‌ها [English]

  • nanophotocatalyst-
  • ZnO-Ag-Z-
  • reactive red (198)- Langmuir-Hinshelwood

This is an open access article under the CC-BY-SA 4.0 license.( https://creativecommons.org/licenses/by-sa/4.0/)

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