مطالعات ستون بستر ثابت جذب یون نیترات توسط جاذب مونت موریلونیت اصلاح شده

درویش, مریم; تقوی, لعبت; مرادی دهقی, شهرام; کرباسی, عبدالرضا

مطالعات ستون بستر ثابت جذب یون نیترات توسط جاذب مونت موریلونیت اصلاح شده

نوع مقاله : پژوهشی کیفی

نویسندگان

مریم درویش ¹

لعبت تقوی ²

شهرام مرادی دهقی ³

عبدالرضا کرباسی ⁴

¹ دانشجوی گروه محیط‌زیست، دانشگاه آزاد اسلامی، واحد علوم‌وتحقیقات، تهران، ایران

² عضوهیات‌علمی گروه محیط‌زیست، دانشگاه آزاد اسلامی، واحد علوم‌وتحقیقات، تهران، ایران

³ دانشکده شیمی ، واحد شمال تهران ، دانشگاه آزاد اسلامی ، تهران ، ایران

⁴ دانشیار (ژئوشیمی زیست محیطی) گروه مهندسی محیط زیست ، دانشکده تحصیلات تکمیلی محیط زیست ، دانشگاه تهران ، تهران ، ایران.

چکیده

در ﺳﺎل ﻫﺎی اﺧﯿﺮ، ﺑﻪ دﻟﯿﻞ ﻣﺤﺪودیﺖ ﻣﻨﺎﺑﻊ آبی و اﻓﺰایﺶ ﻏﯿﺮﻣﻌﻤﻮل نیترات در محیط، ﺗﻼشﻫﺎی ﺑﺴﯿﺎری جهت حذف و کنترل آن در راﺳﺘﺎی بهره مندی از جاذب های ﻃﺒﯿﻌﯽ(رسها) ﺻﻮرت ﮔﺮﻓﺘﻪ اﺳﺖ. اﻣﺎ با توجه به بار منفی سطحی ذرات بنتونیت، جاذب ﻧﯿﺎزﻣﻨﺪ اﺻﻼح است.

در مطالعه جاری، جذب ستونی نیترات توسط جاذب مونت موریلونیت کلسیم اصلاح شده مورد بررسی قرار گرفت. همچنین به منظور تغییربار سطحی و افزایش بازدهی جذب سه مرحله ی اسیدشویی، لایه گذاری اکسیدروی و بارگذاری سورفکتانت کاتیونی هگزادسیل تری متیل آمونیوم بروماید برروی جاذب انجام شد. برهمکنش مولکولی و کریستالوگرافی مونت موریلونیت خالص و نانو جاذب سنتزی(ACZ) ﺑﺎ ﻃﯿﻒ ﺳﻨﺠﯽ ﻓﺮوﺳﺮخ و آنالیز پرتوایکس ﺷﻨﺎﺳﺎیﯽ ﮔﺮدیﺪ. همچنین مورفولوژی نانو جاذب ACZقبل و بعد از مواجهه با آلاینده نیترات ﺑﺎ اﺳﺘﻔﺎده از ﻣﯿﮑﺮوﺳﮑﻮﭘﯽ اﻟﮑﺘﺮوﻧﯽ روﺑﺸﯽ و میکروسکوپ الکترونی عبوری ارزیﺎﺑﯽشد.. فشردگی نانو ذرات و دسترسی کمتربه منافذ و حفرات در ستون بستر ثابت، سبب کاهش ظرفیت جذب جاذب درون ستون نسبت به حالت ناپیوسته شد. نتایج نشان داد که با افزایش غلظت خوراک ورودی از 80 به 120 و mg/L 150، به ترتیب %67/39 و %88/25 ظرفیت جذب افزایش یافت. کاهش دبی جریان ورودی سبب افزایش زمان نفوذ، برهمکنش و دسترسی بیشتر به محل های اتصال برای یونهای نیترات و در نهایت موجب بهبود عملکرد ستون و افزایش دبی جریان ورودی موجب کاهش ظرفیت جذب و زمان شکست شد. بنابراین جذب یون های نیترات توسط مرحله انتقال جرم داخلی، کنترل و به مدت زمان برهم کنش و فرصت نفوذ به درون جایگاه های فعال وابسته است. با افزایش در ارتفاع بستر از 4/2 به cm9، افزایش محسوسی در ظرفیت جذب از 60/608 به mg/g 77/167 رخ داد. اثر نوع شوینده و تعداد مراحل بازیابی ستون جذب نشان داد؛ پس از 3 مرحله آبشویی، اسید شویی نقش مهمی درافزایش بازیابی ستون داشت. داده‌های تجربی با ضرایب همبستگی 0/95R²> با دو مدل سینتیکی توماس و یون- نلسون مطابقت داشت. در ﭘﮋوﻫﺶ ﺣﺎﺿﺮ، ستون نانو جاذب ACZ ﺑﻪ ﻋﻨﻮان ﻋﺎﻣﻞحذف سریع یون نیترات از محلولهای آبی معرفی و جهت استفاده در سیستم های تصفیه ﺑﺎ ﻗﺎﺑﻠﯿﺖ اﺳﺘﻔﺎده مجدد پیشنهاد شد.

کلیدواژه‌ها

نیترات

نانو جاذب

دبی جریان

ارتفاع بستر

توماس و یون- نلسون

موضوعات

فیلترکردن

عنوان مقاله English

Fixedâbed column studies of nitrate ion adsorption using modified montmorillonite adsorbent

نویسندگان English

Maryam Darvish ¹

Lobat Taghavi ²

Shahram Moradi Dehaghi ³

Abdolreza Karbassi ⁴

¹ student of Environment, Islamic Azad University, Science and Research Branch, Tehran, Iran

² Faculty of Environment, Islamic Azad University, Science and Research Branch, Tehran, Iran

³ Faculty of Chemistry, Tehran North Branch, Islamic Azad University, Tehran, Iran

⁴ Associate professor (Geochemistry Ecological) of Department of Environmental Engineering, Graduate Faculty of Environment, University of Tehran, Tehran, Iran.

چکیده English

Research subject: In recent years, due to limited water resources and the extraordinary increase in nitrates in the environment, efforts to remove and control in order to benefit from the natural adsorbents have been made. Although according to the negatively charged surface of bentonite particles, absorbent needs improvement.

Research approach: In the current study, the adsorption of nitrate columns by the modified calcium montmorillonite adsorbent was investigated. Furthermore, In order to change the surface load and increase the adsorption efficiency, three-step acid leaching, oxidation layering, and loading of the cationic surfactant hexadecyltrimethylammonium bromide on the adsorbent were performed. Molecular interaction and crystallography of pure montmorillonite and synthetic nano-adsorbent (ACZ) were characterized by Fourier transform infrared spectroscopy and X-ray analysis. Moreover, the morphology of ACZ nano adsorbents was evaluated using Transmission electron microscopy and scanning electron microscopy.

Main results: Nanoparticle compaction and less access to pores and cavities in the fixed bed column reduced the adsorbent capacity inside the column compared to the discontinuous system.

The results showed that an increase in inlet concentration from 80 to 150 mg/L increased the adsorption capacity from 67.39 to 88.25 mg/g. Reducing the inlet flow rate increased the penetration time, interaction, and greater access to the binding sites for nitrate ions and finally improved the column performance and increased the inlet flow rate reduced the adsorption capacity and breakthrough time. Therefore, the adsorption of nitrate ions by the stage of internal mass transfer is controlled and depends on the duration of interaction and the possibility of penetration into the active sites. With increasing the bed height from 4.2 to 9 cm, there was a significant increase in adsorption capacity from 60.608 to 77.167 mg/g. The effect of detergents and recovery showed an absorption column; After 3 leaching steps, acid leaching played an important role in increasing column recovery. Experimental data with correlation coefficients of R²>0.95 corresponded to Thomas and Yoon-Nelson kinetic models.

In this study, the ACZ nano adsorbent column for rapid removal of nitrate ions from aqueous solutions was introduced and for use in reusable systems was proposed.

کلیدواژه‌ها English

Nitrate

Nano adsorbent

flow rate

Bed height

Thomas and Yoon-Nelson

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