هیدروژل‌های نانومغناطیسی بر پایه کربوکسی‌متیل‌سلولوز-خاک دیاتومه پیوندخورده با آکریل‌آمید برای جذب رنگینه کاتیونی بنفش بلوری

نوع مقاله: پژوهشی

نویسندگان

قزوین، دانشگاه بین‌المللی امام خمینی (ره)، دانشکده علوم پایه، گروه شیمی، صندوق پستی 288

چکیده

در سال‌های اخیر، جداسازی رنگینه‌ها از آب‌های آلوده توجه زیادی را به خود جلب کرده است. روش‌های سنتی برای پاک‌سازی رنگینه‌ها همیشه مؤثر نیستند. کوشش‌های زیادی در توسعه هیدروژل‌های نانوکامپوزیت برای جذب کارآمد رنگینه انجام شده است. در این پژوهش، هیدروژل‌ نانومغناطیسی با استفاده از کربوکسی‌متیل‌سلولوز (CMC)، خاک دیاتومه و آکریل آمید (AAm) تهیه و برای جذب رنگینه بنفش بلوری به‌عنوان نمونه‌ای از رنگینه‌های کاتیونی، از محلول‌های آبی به‌کارگرفته شد. نخست، هیدروژل‌ بر پایه‌ کربوکسی‌ متیل‌سلولوز و خاک دیاتومه با آغازگر رادیکالی آمونیوم پرسولفات (APS) و مونومر آکریل‌آمید و شبکه‌ای‌کننده متیلن بیس‌آکریل‌آمید (MBA) در محیط آبی سنتز شد. سپس، هیدروژل نانومغناطیسی با بارگذاری یون‌های آهن (II) و آهن (III) در هیدروژل و نیز هم‌رسوبی این یون‌ها در محیط بازی تهیه شد. ساختار نمونه‌ها با طیف‌سنجی زیرقرمز تبدیل فوریه (FTIR)، تجزیه گرماوزن‌سنجی (TGA)، میکروسکوپی الکترونی پویشی (SEM) و میکروسکوپی الکترونی عبوری (TEM) تأیید و خواص مغناطیسی آن‌ها با مغناطیس‌سنج ارتعاشی (VSM) اندازه‌گیری شد. تصاویر SEM نشان داد، نانوذرات مغناطیسی Fe3O4 به‌خوبی در بستر متخلخل هیدروژل جای گرفته‌اند. اندازه تقریبی نانوذرات مغناطیسی بر اساس تصاویر TEM حدود 5 تا 15mm بود. در مرحله بعد، جذب رنگینه به‌وسیله هیدروژل نانومغناطیسی بررسی و اثر عواملی چون زمان تماس، pH، غلظت اولیه‌ محلول رنگینه و دما بر مقدار جذب رنگینه با جاذب ارزیابی شد. بیشترین درصد جذب رنگینه در دمای محیط و غلظت اولیه 10mg/L در pH برابر 7 به‌مدت 60min   نزدیک به %96 بود. جاذب سنتز شده قابلیت استفاده مجدد دارد که از شاخص‌ترین مزیت‌های آن داشتن خاصیت مغناطیسی است. بنابراین، جداسازی با آهن‌ربا از محلول، پس از حذف رنگینه بسیار آسان است. با بررسی الگو‌های هم‌دمای جذب سطحی مشخص شد، الگوی Temkin تطابق خوبی با داده‌های تجربی حاصل دارد. مطالعات سینتیکی نیز نشان داد، فرایند جذب از الگوی سینتیکی شبه‌مرتبه دوم پیروی می‌کند.

کلیدواژه‌ها


عنوان مقاله [English]

Nanomagnetic Hydrogels Based on Carboxymethylcellulose/Diatomaceous Earth Grafted with Acrylamide for Adsorption of Cationic Crystal Violet Dye

نویسندگان [English]

  • Hossein Ghasemzadeh Mohammadi
  • Shohreh Jamshidbeigi
  • Maryam Dargahi
Chemistry Group, Faculty of Chemistry, Imam Khomeini International University, P.O. Box: 288, Qazvin, Iran
چکیده [English]

Hypothesis: Removal of toxic dyes from wastewater has attracted considerable attention in recent years. Conventional methods are not usually effective for the removal of dyes. Much effort has been expended on the development of nanocomposite hydrogels with more efficient adsorption properties. In this research, a nanomagnetic hydrogel was synthesized useing carboxymethyl cellulose (CMC), diatomaceous earth (celite), and acrylamide (AAm). The hydrogel was used for adsorption of crystal violet from aqueous solutions.
Methods: Initially, the hydrogels were synthesized using CMC, celite, and AAm in the presence of ammonium persulfate (APS) as initiator and methylene bisacrylamide (MBA) as a crosslinker. The nanomagnetic hydrogel was prepared by loading Fe(II) and Fe(III) ions into the hydrogel and subsequent co-precipitation of Fe(II) and Fe(III) ions in an alkaline solution. The hydrogel and nanomagnetic hydrogel were characterized by Fourier transmission infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and a vibrating-sample magnetometer (VSM).
Findings: The results of SEM showed that the magnetic nanoparticles were well dispersed throughout the hydrogel. The TEM images indicated that the size of the magnetic nanoparticles was about 5-15 nm. The effects of various factors such as temperature, contact time, pH, and initial dye concentration on the dye adsorption behavior of the hydrogels were determined. The maximum adsorption at pH 7 in a 10 ppm of dye concentration reached 96% after 60 min at room temperature. The nanomagnetic hydrogel could be used as an effective adsorbent for the removal of cationic crystal violet dye from aqueous solutions and could be easily removed by an external magnetic field and reused. The adsorption behavior was modeled accurately using the Temkin model. The kinetics of adsorption followed a pseudo-second-order kinetic model.

کلیدواژه‌ها [English]

  • carboxymethylcellulose
  • diatomaceous earth
  • acrylamide
  • nanomagnetic hydrogel
  • crystal violet

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