هیدروژل‌های پلیمری بر‌پایه آکریلیک اسید و آکریل‌آمید برای حذف رنگینه کاتیونی قرمز 46 بازی (BR 46) از محلول‌های آبی

نوع مقاله: پژوهشی

نویسندگان

تهران، دانشگاه پیام نور، گروه شیمی، صندوق پستی 3697-19395

چکیده

حذف رنگینه‌ها با استفاده از پلیمرهای مختلف با گروه‌های عاملی اهمیت زیادی در کاربردهای  (Poly(AM-co-AA زیست‌محیطی دارد. جاذب‌های پلیمری به‌ویژه هیدروژل‌ها با ایجاد کمپلکس از راه جاذبه‌های الکتروستاتیک و پیوندهای هیدروژنی قابلیت حذف رنگینه‌ها را دارند. در این مقاله، از هیدروژل‌های پلی‌آکریلیک اسید (PAA)، پلی‌آکریل‌آمید (PAM) و پلی(آکریلیک اسید-کو-آکریل‌آمید)، (AA-co-AM)وPoly، به‌عنوان جاذب برای رنگ‌بری پساب دارای رنگینه قرمز 46 بازی (BR 46) استفاده شده است. هر سه هیدروژل با استفاده از پلیمرشدن رادیکالی با شبکه‌ساز N′،N-متیلن بیس(آکریل‌آمید) در آب تهیه شدند. ساختار و شکل‌شناسی جاذب‌های هیدروژل با روش‌های میکروسکوپی الکترونی پویشی (SEM)، طیف‌سنجی زیرقرمز تبدیل فوریه (FTIR) و گرماوزن‌سنجی (TGA و DTG) بررسی شدند. برای مطالعه ویژگی‌های رنگ‌بری جاذب، عوامل مؤثر بر فرایند رنگ‌بری همچون pH، مقدار جاذب، غلظت رنگینه و زمان تماس بررسی شد. نتایج نشان داد، افزایش pH، مقدار جاذب و زمان تماس اثر مستقیم و غلظت محلول رنگینه رابطه معکوس با کاهش مقدار رنگ‌بری دارد. همچنین، بررسی خواص شیمیایی و فیزیکی در حذف رنگینه کاتیونی BR46، با الگوی هم‌دمای Langmuir مطابقت خوبی را نشان داد و داده‌ها نیز به‌خوبی از الگوی سینتیکی شبه‌مرتبه دوم پیروی می‌کند. همچنین، قابلیت استفاده مجدد از جاذب ارزیابی شد. نتایج نشان داد، پس از پنج چرخه جذب-واجذب ظرفیت جذب هیدروژل از %4/94 به %3/63 کاهش می‌یابد. مقدار درصد تورم هیدروژل (AA-co-AM)وPoly و رابطه آن با تغییرات pH بررسی شد. بیشترین درصد تورم در محیط قلیایی و در pH برابر با 8 مشاهده شد.  

کلیدواژه‌ها


عنوان مقاله [English]

Polymer Hydrogels Based on Acrylic Acid and Acrylamide and Their Applications to Remove Cationic Dye of Basic Red 46 (BR 46) from Aqueous Solutions

نویسندگان [English]

  • Khadijeh Didehban
  • Seyyed Hamid Hasani Moghaddam
  • Jafar Azimvand
Department of Chemistry, Payame Noor University, P.O. Box: 1659639884, Tehran, Iran
چکیده [English]

Hypothesis: The removal of dyes using polymers with different functional groups is of great concern in environmental applications. Polymeric adsorbents, particularly hydrogels, through formation of polymer complexes by electrostatic attraction and hydrogen bonding have the ability to remove dyes. The hydrogels of polyacrylic acid (PAA), polyacrylamide (PAM) and poly(acrylic acid-co-acrylamide) (poly(AA-co-AM)) were used as adsorbents for basic red 46 (BR 46) dye removal from wastewater.
Methods: All three hydrogels were prepared through radical polymerization mechanism by N'-N-methylene-bis(acrylamide) in water. Hydrogel adsorbents were investigated using SEM, FTIR spectroscopy, and TGA-DTG analysis. In order to study the bleaching characteristics of adsorbent, the factors affecting bleaching process such as pH, adsorbent dosage, dye concentration, and contact time were investigated.
Findings: The results showed that pH increase, adsorbent dosage, and contact time had direct impact on bleaching and the concentration of dye had a reverse relationship with it. In addition, the physical and chemical properties in removal of cationic dye of BR46 conformed well to Langmuir isotherm model and the experimental data followed the pseudo-second-order kinetic model well. In evaluation of the reusability of the adsorbent it was shown that after 5 cycles of the absorption/desorption test, the hydrogel absorption capacity decreased from 94.4% to 63.3%. The swelling test of poly(AA-co-AM) hydrogel and its dependence on pH changes revealed its highest percentage of swelling in alkaline environment at pH value of 8.

کلیدواژه‌ها [English]

  • polyacrylic acid
  • polyacrylamide
  • basic red 46
  • adsorption isotherms
  • adsorption kinetics
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