شیمى کاربردى روز

شیمى کاربردى روز

عامل دار کردن کاغذ صافی سلولزی با کربن فعال بطریق کووالانسی و کاربرد آن در حذف فلزات سنگین (Pb, Cd, Ni) از آب آشامیدنی

نوع مقاله : مقاله علمی پژوهشی

نویسنده
گروه شیمی، دانشکده علوم، دانشگاه گلستان، گرگان، ایران
چکیده
حذف فلزات سنگین مانند نیکل، سرب و کادمیوم به دلیل اثرات مضر آنها بر اکوسیستم بسیار مهم است. این فلزات سمی می توانند فرآیندهای فیزیولوژیکی گیاهان را مختل کنند و بر تعرق، فتوسنتز، فعالیت آنزیم ها و تعادل هورمونی تأثیر بگذارند. غشاهای نانوفیلتراسیون با اندازه منافذ 1-10 نانومتر به طور انتخابی یون های فلزات سنگین را حذف می کنند و در عین حال مواد معدنی و مواد مغذی ضروری را حفظ می کنند. در این پژوهش، از کاغذ صافی سلولزی عامل‌دارشده با کربن فعال بطریق کووالانسی (FP@Si@AC) برای حذف موثر فلزات سنگین (Pb، Cd، Ni) از آب آشامیدنی استفاده شد. جذب در شرایط ملایم، در دمای محیط، و در pH خنثی به مدت 3-5 ساعت انجام شد. در این شرایط بالاترین میزان جذب مربوط به Pb بود، و Cd و Ni در درجه بعدی درصد جذب بودند. مطالعات بر روی ایزوترم-های جذب نشان داد که جذب سرب بهترین تطابق را با ایزوترم لانگمویر دارد، و فلزات نیکل و کادمیم از هر دو ایزوترم فروندلیچ و لانگمویر پیروی می کنند. بررسی مکانیسم جذب نشان داد که جذب هم از طریق کئوردیناسیون با گروه‌های موجود بر روی کربن فعال و هم از طریق جذب فیزیکی صورت می-گیرد. کاغذ صافی FP@Si@AC می تواند چندین مرتبه بدون هیچ گونه افت فعالیت جذب قابل توجه، بازیابی شود و مجددا مورد استفاده قرار گیرد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Covalent Functionalization of Cellulose Filter Paper with Activated Carbon and Its Application in Removing Heavy Metals (Pb, Cd, Ni) from Drinking Water

نویسنده English

Milad Kazemnejadi
Chemistry Department, Faculty of Sciences, Golestan University, Gorgan, Iran
چکیده English

The removal of heavy metals such as nickel, lead, and cadmium is crucial due to their harmful effects on ecosystems. These toxic metals can disrupt physiological processes in plants, affecting transpiration, photosynthesis, enzyme activity, and hormonal balance. Nanofiltration membranes with pore sizes of 1–10 nm selectively remove heavy metal ions while preserving essential minerals and nutrients. In this research, covalently functionalized cellulose filter paper with activated carbon (FP@Si@AC) was used to effectively remove heavy metals (Pb, Cd, Ni) from drinking water. The adsorption was carried out under mild conditions, at ambient temperature, and at neutral pH for 3-5 hours. Under these conditions, the highest adsorption rate was related to Pb, and Cd and Ni were the next highest adsorption percentages. Studies on the adsorption isotherms showed that the adsorption of Pb best fits the Langmuir isotherm, and the nickel and cadmium metals follow both Freundlich and Langmuir isotherms. Examining the adsorption mechanism showed that the adsorption takes place both through coordination with the groups on activated carbon and through physical adsorption. FP@Si@AC filter paper can be recovered and reused several times without any significant loss of adsorption activity.

کلیدواژه‌ها English

Modified cellulose Filter paper
Activated carbon
Heavy metal elimination
Langmuir isotherm
Freundlich isotherm
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