بهینه‌سازی جذب یون نیکل از پساب توسط کامپوزیت کیتوسان/بنتونیت فعال‌شده با اسید‌کلریدریک: نقش مقدار بنتونیت ایرانی و عوامل مؤثر در جذب

نقی‌زاده, امیرمحمد; رضایی, حمیدرضا; حسین‌زاده, مجید

doi:10.30501/jamt.2026.579626.1362

بهینه‌سازی جذب یون نیکل از پساب توسط کامپوزیت کیتوسان/بنتونیت فعال‌شده با اسید‌کلریدریک: نقش مقدار بنتونیت ایرانی و عوامل مؤثر در جذب

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

امیرمحمد نقی‌زاده ¹

حمیدرضا رضایی ²

مجید حسین‌زاده ³

¹ دانشجوی کارشناسی ارشد، دانشکده مهندسی عمران، دانشگاه علم و صنعت، تهران، ایران

² دانشیار، دانشکده مهندسی مواد و متالورژی، دانشگاه علم و صنعت، تهران، ایران

³ استادیار، دانشکده مهندسی عمران، دانشگاه علم و صنعت، تهران، ایران

10.30501/jamt.2026.579626.1362

چکیده

آلودگی منابع آبی به کاتیون‌های فلزات سنگین مثل نیکل، کبالت و سرب یکی از مهم‌ترین چالش‌های زیست‌محیطی است. روش‌های گوناگونی برای کاهش غلظت این آلاینده‌ها تا حد مجاز و امکان استفادة مجدد از پساب‌های صنعتی در بخش‌های مختلف ازجمله صنعت و کشاورزی، توسعه یافته‌اند. دراین‌میان، جذب آلاینده‌ها با استفاده از جاذب‌های گوناگون یکی از مؤثرترین و پرکاربردترین روش‌ها به‌شمار می‌رود. در این تحقیق، جاذب کامپوزیتی کیتوسان/بنتونیت فعال‌شده با اسید‌کلریدریک به‌صورت مهره تهیه شد. برای این منظور، سوسپانسیون حاوی کیتوسان و بنتونیت با درصدهای مختلف تهیه و سپس قطره‌قطره به محیط قلیایی حاوی NaOH افزوده شد و به‌مدت 24 ساعت ماند تا مهره‌های مناسب از نظر اندازه، شکل و استحکام ظاهری تشکیل شوند. نتایج الگوی پراش اشعه ایکس مهره‌های کامپوزیتی حاکی‌از افزایش فاصلة صفحات مونت‌موری‌لونیت بود. همچنین نتایج آزمون سطح ویژه (BET) نشان داد که سطح ویژة مهره‌های کامپوزیتی کیتوسان-بنتونیت نسبت به مهرة کیتوسان حدود 407 درصد افزایش یافته است. در آزمایش طیف‌سنجی مادون‌قرمز تبدیل فوریه (FTIR)، تشکیل کمپلکس Ni(RNH2)+2 بین کاتیون نیکل و گروه آمینی کیتوسان در پیک جذبی با عدد موج cm-11632 مشاهده شد. در شرایط بهینه شامل: غلظت اولیة نیکل ppm80، pH برابر با 7 تا 8 و دمای 25 درجة سلسیوس، استفاده از مهره‌های کامپوزیتی کیتوسان/ بنتونیت فعال‌شده (با نسبت وزنی 2 به 1) منجر به 93 درصد حذف نیکل و ظرفیت جذب mg/g 6/18 شد. بررسی ایزوترم‌های جذب لانگ‌مویر و فروندلیچ برای مهرة کامپوزیتی کیتوسان/بنتونیتِ فعال‌شده نشان داد که نتایج با مدل فروندلیچ تطابق بهتری دارند.

کلیدواژه‌ها

مهره‌های کامپوزیتی

کیتوسان

مونت‌موری‌لونیت

حذف فلزات سنگین

ایزوترم فرندولیچ

موضوعات

کامپوزیت های زمینه پلیمری

عنوان مقاله English

Optimization of Nickel Ion Adsorption from Wastewater by Chitosan/Activated Bentonite Composite activated with hydrochloric acid: The Role of Iranian Bentonite Content and factors affecting absorption

نویسندگان English

Amir Mohammad Naghizadeh ¹

Hamidreza Rezaei ²

Majid Hosseinzadeh ³

¹ M.Sc. Student, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran.

² Professor, School of Materials Science and Metallurgical Engineering, Iran University of Science and Technology, Tehran, Iran.

³ Assistant Professor, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran.

چکیده English

Water contamination by heavy metal cations such as nickel, cobalt, and lead has become a significant environmental concern. To remove these pollutants from water to levels that allow industrial wastewater to be reused in industrial and agricultural applications, various methods, including adsorption using different adsorbents, have been employed. In this study, a chitosan/acid-activated bentonite composite adsorbent was prepared in the form of beads. A suspension containing chitosan and bentonite at different weight ratios was added dropwise into an alkaline medium containing NaOH and then allowed to stand for 24 h to facilitate the formation of beads with suitable size, shape, and apparent mechanical strength. The X-ray diffraction (XRD) pattern of the composite beads indicated an increase in the interlayer spacing of the montmorillonite layers. Brunauer–Emmett–Teller (BET) analysis showed that compositing chitosan with bentonite increased the specific surface area by 407% compared with chitosan beads alone. Fourier-transform infrared (FTIR) spectroscopy revealed the formation of a Ni(RNH₂)²⁺ complex between nickel cations and the amine groups of chitosan, evidenced by an absorption peak at a wavenumber of 1632 cm⁻¹. Nickel adsorption at an initial concentration of 80 ppm, pH 7–8, and a temperature of 25 °C, using composite beads with a chitosan-to-bentonite weight ratio of 2:1, achieved 93% removal, corresponding to an adsorption capacity of 18.6 mg/g. The results of the Langmuir and Freundlich isotherm studies for the activated chitosan/bentonite composite beads indicated that the experimental data were in good agreement with the Freundlich model.

کلیدواژه‌ها English

Composite Beads

Chitosan

Montmorillonite

Heavy Metal Removal

Freundlich Isotherm

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