نوع مقاله : مقاله کامل پژوهشی
نویسندگان
1 گروه مهندسی مواد، دانشکده فنی و مهندسی، دانشگاه بوعلی سینا، همدان، ایران.
2 گروه پژوهشی مواد غیر فلزی، پژوهشگاه نیرو، تهران، ایران.
چکیده
تصفیه انواع پساب های صنعتی و بازگردانی آب به چرخه مصرف از اهمیت زیادی برخوردار است. در این پژوهش با تولید نانوجاذب کامپوزیتی نایلون6/ نانوذرات زیرکونیا شرایط برای جداسازی کاتیون فلزات سنگین (مانند Cu، Ni و Co) به عنوان یکی از آلاینده های مهم آب بررسی شده است. نانوجاذب کامپوزیتی با مقادیر مختلف زیرکونیا توسط روش الکتروریسی تولید شد. به منظور بررسی ریزساختار و بنیان های مولکولی در نانو جاذب کامپوزیتی به ترتیب از آزمون های SEM و FTIR استفاده شد. نتایج ریزساختارشناسی نشان داد که با افزایش نسبت سرامیک به پلیمر میانگین قطر الیاف از 387 به 105 نانومتر و تخلخل سطحی از 1/83 به 6/65 درصد کاهش یافت. علاوه بر این، از توزیع همگن نانوذرات روی الیاف کاسته و عیوب الکتروریسی مانند آگلومراسیون نانوذرات روی برخی الیاف مشاهده شد. افزودن نانوذرات زیرکونیا بنیان های مولکولی نایلون 6 را تغییر نداد. با توجه به توزیع و ایجاد مواضع فیزیکی همگن توسط نانوذرات زیرکونیا، نسبت سرامیک به پلیمر برابر 88/0 (g/g) به عنوان ترکیب بهینه انتخاب شد. تغییرات زاویه تماس آب روی سطح نانوجاذب نشان داد که سطح مورد مطالعه در لحظه ابتدایی تماس آب گریز و در ادامه آب دوست است. بررسی سینتیک جذب کاتیون فلزات سنگین توسط نانوجاذب نشان داد که از مدل شبه درجه اول تبعیت می کند. بیشینه مقدار جذب کاتیون فلزات Cu، Ni و Co به ترتیب برابر 6/9، 7/8 و 8/4 میلی گرم بر سانتیمتر مربع بود که بیانگر بهره وری بالای نانوجاذب کامپوزیتی نایلون6/ زیرکونیا در جذب کاتیون های فلزات سنگین است. بنابراین با توسعه انواع مختلف نانوجاذب پلیمر- سرامیک امکان بازچرخانی پساب صنعتی فراهم می شود.
کلیدواژه‌ها
عنوان مقاله [English]
Kinetic Study on Surface Adsorption of Heavy Metal Cations by Nylon6/Zirconia Nano-absorbent
نویسندگان [English]
- Ali Mosayebi 1
- Hamid Esfahani 1
- Fatemeh Dabir 2
1 Department of materials Engineering, faculty of Technical and engineering , Bu-Ali Sina University, Hamedan, Iran.
2 Non-metallic Materials Department, Niroo Research Institute (NRI), Tehran, Iran.
چکیده [English]
Industrial wastewater treatment and recycling the treated water are drawn to attention. In this study, the removal of heavy metal cations (e.g. Cu, Ni, Co) as an important pollutants, has been investigated by applying the Nylon6/zirconia nano-composite absorbent. Nano-composite membranes containing different amount of zirconia nano-particles (NPs) were synthesized via electrospinning method. To study the microstructure and functional molecule groups of nano-absorbent, SEM and FTIR techniques were used, respectively. The results showed that the average diameter size of fibers and surface porosity decreased from 387 to 105 nm and 83.1 to 65.6 % with increasing the zirconia content, respectively. Furthermore, zirconia NPs were distributed heterogeneously and also electrospinning defects such as zirconia agglomerates were observed in the mat. Adding the zirconia NPs did not affect the functional molecule groups of Nylon6. According to the homogenous distribution and also creation of active sites by zirconia NPs, the ratio of zirconia to Nylon6 equals to 0.88 (g/g) was selected as the optimized composition. Water contact angle variations on the surface of nano- absorbent indicated that the mentioned surface had hydrophobic behavior at the beginning time of contact and then it switched to the hydrophilic manner. Kinetic study on the adsorption of heavy metal cations showed that it was followed by first-pseudo order model. The maximum adsorption was recorded 9.6, 8.7 and 4.8 mg/cm2 respect to the Cu, Ni, and Co cations. It suggests that the Nylon6/zirconia nano-composite has high efficiency to adsorb heavy metal pollutants. Eventually, the water recycling will be achieved by development of polymer-ceramic nano-composite.
کلیدواژه‌ها [English]
- Adsorption Kinetic
- Heavy Metals Cations
- Microstructure
- Nano-fibers
- Zirconia Nano-particles
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