مهندسی شیمی ایران

مهندسی شیمی ایران

سنتز سبز Ce-UiO-66 MOFs برای حذف کنگورد از آب

نوع مقاله : مقاله پژوهشی

نویسندگان
1 کارشناس ارشد نانوشیمی، دانشگاه تحصیلات تکمیلی علوم پایۀ زنجان
2 استادیار نانوشیمی، دانشگاه تحصیلات تکمیلی علوم پایۀ زنجان
چکیده
تولید یک جاذب برای تصفیۀ آب با حداقل انرژی، با یک روش سبز، هدف بسیاری از محققان است. MOFs (چارچوب‌های فلز- آلی) دسته­ای از مواد متخلخل جدید هستند که کاربردهای زیادی درزمینه­های مختلف دارند. این دسته از مواد به‌سبب داشتن ویژگی­های یگانه مانند تخلخل بالا و سطح ویژۀ زیاد، قابلیت استفاده به‌عنوان ذخیره‌کنندۀ انرژی، ذخیره‌کنندۀ هیدروژن و جاذب آلاینده­های موجود در آب آلوده را دارند؛ اما بسیاری از آن‌ها در آب ناپایدار هستند و تخریب‌می­شوند. چارچوب فلز- آلی برپایۀ سریم (Ce-UiO-66) با یک روش سبز، در مدت زمان کوتاهی سنتزشد و سپس، برای فعال­سازی، سه روز درون رفلاکس متانول در دمای °C 60 قرارگرفت و سرانجام، خواص آن بررسی‌شد. در این پژوهش رنگزای آنیونی کنگورد (CR) به‌عنوان آلایندۀ مدل برای بررسی عملکرد جذبی Ce-UiO-66 استفاده‌شد. آزمون­های XRD و FTIR سنتز موفقیت‌آمیز و پایداری بالای جاذب را حتی بعد از قرارگیری در رفلاکس متانول به‌مدت سه روز، تأییدمی­کنند. آزمون جذب/ واجذب نیتروژن سطح ویژۀ m2/g 572 و حجم حفره‌های cm3/g 0/38 را نشان‌داد. سینتیک جذب و ایزوترم جذب Ce-UiO-66 با مدل­های سینتیکی شبه مرتبۀ دوم و مدل ایزوترم لانگمویر قابل توصیف است. بیشترین ظرفیت جذب رنگزا بعد از 2 ساعت در حدود mg/g 400 به‌دست‌آمد. فرایند جذب رنگزا گرماگیر بود و حضور یون کلر در محیط واکنش منجربه کاهش جذب رنگزای کنگورد شد. همچنین، در pHهای اسیدی جذب رنگزا افزایش و در pHهای بازی کاهش‌یافت. بنابراین، می­توان‌گفت که سنتز این جاذب درمقیاس صنعتی انجام‌پذیر است و توانشِ خوبی برای فرایند تصفیۀ آب دارد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Green Synthesis of Ce-UiO-66 MOFs for Removal of Congo Red from Water

نویسندگان English

M. S. Salimi 1
H. Molavi 2
1 MSc. in Nano Chemistry, Institute for Advanced Studies in basic Sciences (IASBS)
2 Assistant Professor of Nano Chemistry, Institute for Advanced Studies in basic Sciences (IASBS)
چکیده English

Production of an adsorbent for water treatment with minimum energy, with a green method is the purpose of many researchers. MOFs (Metal-Organic frameworks) are a type of novel porous materials that have many applications in different fields. Owing to their outstanding properties such as high porosity, high specific surface area, these materials are able to be used in different applications such as energy storage, hydrogen storage, and to be applied as water pollutant adsorbents from wastewater. But many of them are unstable in water and their structure will collapse. A highly stable Cerium-based MOF (Ce-UiO-66 MOF) was synthesized in water in a short period of time via a green room temperature synthetic method, activated via methanol reflux for three days at 60 °C, and finally it was characterized. In this project anionic Congo red (CR) dye was used as a model pollutant to investigate the influence of different conditions on the adsorption performance of the resulting Ce-MOFs. XRD and FTIR analyses confirmed the successful synthesis and high stability of this adsorbent after soaking in methanol reflux at 60 °C. N2 adsorption/desorption analysis showed that this MOF has a surface area of 572 m2/g and a pore volume of 0.38 cm3/g.
The adsorption kinetic and adsorption isotherm of Ce-UiO-66 were described by the Pseudo-second-order kinetic model and the Langmuir isotherm model, respectively. The prepared MOF showed good adsorption performance toward anionic CR dye. The highest adsorption capacity was measured to be about 400 mg/g after 2 h. The adsorption process was endothermic, and the adsorption capacity of CR was decreased in the presence of Cl- ions. Additionally, in acidic condition adsorption of dye increased and in alkaline condition decreased. Accordingly, it can be proposed that it is possible to synthesize this adsorbent in industrial scale and it has good potential for water treatment process.

کلیدواژه‌ها English

Water Treatment
Room Temperature Synthesis
Green Adsorbent
Ce-UiO-66 MOF
Congo Red
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