ایزوترم، سینتیک و ترمودینامیک جذب متیلن بلو با نانوذرات ZnO سنتز شده با کورکومین

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه صنایع غذایی، دانشکده مهندسی شیمی، دانشگاه صنعتی سهند، تبریز، ایران

2 دانشیار، گروه صنایع غذایی ، دانشکده مهندسی شیمی، دانشگاه صنعتی سهند، تبریز، ایران

چکیده

نانوذرات ZnO جاذب­های قوی برای جذب مواد آلی و غیرآلی می­باشند. در این پژوهش نانوذرات ZnO با استفاده از کورکومین در دمای °C 160 و 10=pH سنتز شده و از آن برای حذف متیلن بلو با غلظت‌های اولیه مختلف، و در دما ها و pH ها ی متفاوت مورد استفاده قرار گرفت. ویژگی­های فیزیکی و مورفولوژی نانوذرات سنتز شده با استفاده از تکنیک­های XRD، DLS، SEM، FTIR و  BET آنالیز گردید. نتایج نشان داد با افزایش دما، ابتدا مقدار جذب تا °C 40 افزایش و سپس کاهش یافت که بیشترین جذب برابر با mg/g 320 بود. با افزایش pH نیز مقدار جذب افزایش یافت و در محیط بازی (10=pH) مقدار جذب بیشینه و برابر با mg/g 235 به دست آمد. بررسـی سـینتیک جـذب سطحی داده­ها نشان داد که سینتیک حذف رنگ از مدل سینتیکی شبه مرتبه دوم پیروی می­کند. همچنـین نتـایج ایزوترم جذب نشان داد که نتایج حاصل از جذب با مدل ایزوترم جذب در حال تعادل لانگمویر تطابق خوبی نسبت به فروندلیچ دارند (99/0=R2 و 564/0= RL ). حداکثر ظرفیت جذب بر مبنای ایزوترم لانگمویر در مقدار mg/g 324 حاصل گردید. مقادیر به دست آمده از پارامترهای ترمودینامیکی نیز نشان داد که جـذب متیلن بلو گرماگیر و خودبخودی است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Isotherm, Kinetic and Thermodynamic of Methylene Blue Adsorption Using Synthesized ZnO Nanoparticles by Curcumin

نویسندگان [English]

  • Zahra Sayyar 1
  • Hoda Jafarizadeh-Malmiri 2
1 PhD student, Food Technology Department, Faculty of Chemical Engineering, Sahand University of Technology, Tabriz, Iran
2 Associate Professor, Food Technology Department, Faculty of Chemical Engineering, Sahand University of Technology, Tabriz, Iran
چکیده [English]

ZnO nanoparticles (NPs) are effective adsorbents in removal of various organic and inorganic contaminants. In this study, ZnO NPs were synthesized using curcumin at 160 ° C and pH = 10 and used to degradation methylene blue at different initial concentrations and at different temperatures and pHs. Physical and morphological properties of the synthesized NPs were analyzed using XRD, DLS, SEM, FTIR and BET. Obtained results indicated that by increasing the temperature up to 40 °C, adsorption was initially increased to maximum amount of 320 mg/g and then decreased. Furthermore, maximum amount of adsorption was obtained by increasing in the pH (235 mg/g at pH=10). Results revealed that adsorption kinetics in order to dye remove was well fitted using a pseudo second-order kinetic model. The obtained results were also indicated that the Langmuir equation could be predicted the dye adsorption, better than the Freundlich equation, due to its higher R2 (0.99) and RL (0.564). According to the Langmuir equation, maximum adsorption capacity was 324 mg/g. The obtained values for the thermodynamic parameters were also indicated that the dye adsorption was an endothermic and spontaneous process.

کلیدواژه‌ها [English]

  • Zinc oxide Nanoparticles
  • Curcumin
  • Dye removal
  • thermodynamic parameters Adsorption kinetics
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