فعال‌سازی گرافن اکساید با HCl به‌منظور حذف نیترات از محیط‌های آبی (بررسی سینتیک و مکانیسم واکنش‌ها)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار گروه مهندسی محیط زیست، دانشکده مهندسی عمران، آب و محیط زیست دانشگاه شهید بهشتی، تهران

2 دکترای تخصصی مهندسی محیط زیست، آب و فاضلاب، دانشکده مهندسی عمران، آب و محیط زیست دانشگاه شهید بهشتی، تهران

3 استاد گروه شیمی، دانشکده شیمی، دانشگاه بوعلی سینا، همدان

چکیده

نوشیدن آب آلوده به نیترات در درازمدت تهدید جدی برای سلامتی انسان محسوب می‌شود. در این مطالعه افزایش توانایی گرافن اکساید توسط فعال‌سازی با اسید کلریدریک به‌منظور حذف نیترات از محیط‌های آبی مورد بررسی قرار گرفت. آزمایش‌ها به‌صورت ناپیوسته و با تغییر فاکتورهای مؤثر در واکنش مانند pH، زمان ماند، غلظت نیترات، غلظت گرافن اکساید و گرافن اکساید فعال شده، صورت گرفت و کارایی حذف با استفاده از آزمون آماری ONE WAY ANOVA و نرم‌افزار SPSS-16 مورد بررسی قرار گرفت. مشخصات ساختاری گرافن اکساید فعال شده با استفاده از روش FE-SEM مجهز به طیف سنجی پراش انرژی و سطح ویژه آن نیز با استفاده از روش BET و BJH تعیین شد. نتایج نشان می‌دهد که 52 درصد ساختار گرافن اکساید فعال شده از کربن تشکیل شده و متوسط قطر منافذآن26/896 نانومتر می‌باشد. در این مطالعه حداکثر میزان جذب تعادلی برآورد شده توسط گرافن اکساید فعال شده در حدود 33/3333 میلی‌گرم بر گرم برای نیترات به‌دست آمد که این مقدار از مقادیر گزارش شده توسط سایر جاذب‌های مطالعه شده تاکنون بسیار بالاتر است. با توجه به نتایج حاصله می‌توان از گرافن اکساید فعال‌سازی شده به‌عنوان یک روش جدید برای حذف نیترات از محیط های آبی بهره برداری نمود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Activation of Graphene Oxide with Hydrochloric Acid for Nitrate Removal from Aqueous Solutions

نویسندگان [English]

  • Abolghasem Alighardashi 1
  • Zahra Kashitarash- 2
  • Abbas Afkhami 3
1 Assist. Prof. of Environmental Engineering, Department of Civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran
2 PhD of Environmental Engineering, Department of Civil, Water and Environmental Engineering,Shahid Beheshti University, Tehran, Iran
3 Prof. of Chemistry, Faculty of Chemistry, Bu-Ali Sina University, Hamadan, Iran
چکیده [English]

Long-term drinking of nitrate-contaminated water poses a serious risk to human health. The present study explores the possibility of enhancing the adsorption capacity of graphene oxide via activation with hydrochloric acid for nitrate removal from aqueous solutions. Experiments were performed in a batch reactor in which such major factors as pH, reaction time, and concentrations of both graphene oxide (GO) and activated graphene oxide (AGO) were used as variables. Nitrate removal efficiency was investigated using the One-Way ANOVA statistical test and SPSS-16 software. The chemical composition and solid structure of the synthesized AGO were analyzed using FE-SEM coupled with energy dispersive spectrometry (EDS). The micropore volumes of the samples were determined using the BET and BJH. The predominant composition (52%) of the synthesized AGO was C and its mean pore diameter was 26.896 nm. The maximum adsorption capacity of AGO was estimated at 3333.33 mg/g. Based on the results, the AGO nano-structure may be recomended as a new means for nitrate removal from aqueous solutions.

کلیدواژه‌ها [English]

  • graphene oxide
  • Activation
  • Characterization
  • Nitrate
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