تثبیت نانوذرات بنتونیت اصلاح شده توسط سورفکتانت کاتیونی بر روی سنگدانه‌های پامیس به‌منظور حذف نیترات از محلول آبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، گروه آبیاری و زهکشی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز، اهواز، ایران

2 استاد، گروه آبیاری و زهکشی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز، اهواز، ایران

3 دانشیار، گروه آبیاری و زهکشی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز، اهواز، ایران

10.22093/wwj.2019.172329.2832

چکیده

آلودگی نیترات در منابع آبی، به‌دلیل مشکلات زیست‌محیطی و خطر بالقوه برای سلامتی انسان به یک مسئله مهم تبدیل شده است. این پژوهش با هدف بررسی کارایی تثبیت نانوذرات اصلاح شده بنتونیت توسط سورفکتانت کاتیونی بر روی سنگدانه‌های پامیس به‌منظور حذف نیترات از محیط‌های آبی انجام شد. نانوذرات بنتونیت پس از اصلاح توسط سورفکتانت CTAB با عملیات گرمایی بر روی بستر سنگدانه‌های پامیس تثبیت شدند و مشخصات فیزیکی و ساختاری جاذب آماده شده با تکنیک‌های XRD، EDAX و SEM بررسی شد. از روش سطح پاسخ بر مبنای طراحی باکس بنکن برای ارزیابی اثر متغیرهای مستقل pH، دما و دز جاذب بر عملکرد پاسخ و همچنین پیشگویی بهترین مقدار پاسخ استفاده شد. با استفاده از مدل ایزوترم لانگمیر و فروندلیچ، ثابت‌های تعادلی و با استفاده از سینتیک شبه مرتبه اول و دوم، ثابت‌های سینتیکی محاسبه شد. با توجه به نتایج، مقدار بهینه راندمان حذف نیترات بر اساس مدل باکس بنکن در pH=5، میزان جاذب 15 گرم در لیتر و دمای 35 درجه سلسیوس، 49/63 درصد به‌دست آمد. همچنین با افزایش دز جاذب و زمان تماس، میزان حذف نیترات افزایش یافت در حالی که با افزایش pH و غلظت اولیه نیترات، راندمان حذف آن کاهش پیدا کرد. مطالعات ایزوترم نشان دادند که داده‌های آزمایشگاهی تطابق بهتری با ایزوترم لانگمیر دارند و بهترین مدل سینتیک جذب به‌وسیله مدل سینتیک شبه مرتبه دوم به‌دست آمد. همچنین راندمان احیا در 5 سیکل جذب و واجذب، بیش از 85 درصد بود. نتایج نشان داد که سنگدانه پامیس اصلاح شده می‌تواند به‌عنوان جاذب مؤثر و در عین حال قابل دسترس برای حذف آلاینده‌ها مورد استفاده قرار بگیرد.

کلیدواژه‌ها


عنوان مقاله [English]

Stabilization of Bentonite Nanoparticles Modified by Cationic Surfactant on Pumice Aggregates for the Removal of Nitrate from Aqueous Solution

نویسندگان [English]

  • Zeinab Mikhak Beiranvand 1
  • Saeed Boroomand Nasab 2
  • Abdolrahim Hoshmand 3
1 PhD Student, Dept. of Irrigation and Drainage, Shahid Chamran University of Ahvaz, Ahvaz, Iran
2 Prof., Dept. of Irrigation and Drainage, Shahid Chamran University of Ahvaz, Ahvaz, Iran
3 Assoc. Prof., Dept. of Irrigation and Drainage, Shahid Chamran University of Ahvaz, Ahvaz, Iran
چکیده [English]

Nitrate contamination in water resources has become an important issue because of the environmental issue and potential risk for human health. The aim of this study is investigating the stabilization of modified bentonite nanoparticles by cationic surfactant on pumice aggregates to remove nitrate from aqueous environments. Bentonite nanoparticles were investigated by XRD, EDAX, and SEM techniques after modification by CTAB surfactant with the thermal method on the substrate of Pumice aggregate stabilization and physical and structural characteristics of the adsorbent. In this research, response surface method based on the Box-Behnken model was used to evaluation of the effects of independent variables such as pH, temperature and the amount of adsorbent on the response function and prediction of the best response value. Langmuir and Freundlich isotherm models were used for calculating the equilibrium constants and pseudo-first and second order constants. According to the results, the optimum nitrate removal efficiency was determined 63.49% based on the Box-Behnken model in pH = 5, the adsorbent concentration of 15 g/L, and temperature 35 °C. As well as, the nitrate removal rate was increased by increasing the amount of adsorbent and contact time unless the removal efficiency was decreased with an increase in pH and initial nitrate concentration. Isotherm surveying showed that the laboratory data had better agreement with Langmuir isotherm and the best kinetic model of adsorption was determined by the pseudo-second-order kinetic model. Also, the recovery efficiency in 5 cycles of absorption and desorption was observed more than 85%. This study showed that modified Pumice aggregates could be used as an effective and economical adsorbent for pollutants elimination.

کلیدواژه‌ها [English]

  • Nitrate removal
  • Modified Pumice
  • Box Behnken

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