بررسی آزمایشگاهی حذف 4- نونیل‌فنل از محلول‌های آبی توسط گرانول‌های آیروژل اکسیدگرافن- کیتوسان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، گروه تخصصی علوم محیط‌زیست (آلودگی)، دانشکده منابع طبیعی و محیط‌زیست، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران

2 دانشیار، گروه محیط‌زیست، دانشکده مهندسی، دانشگاه تهران، تهران، ایران

3 دانشیار، گروه تخصصی علوم محیط‌زیست، دانشکده منابع طبیعی و محیط‌زیست، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران

4 استاد، گروه شیمی، دانشکده علوم پایه، دانشگاه آزاد اسلامی، واحد تهران مرکز، تهران، ایران

چکیده

4- نونیل فنل به‌عنوان یکی از فراوان‌ترین و سمّی‌ترین آلکیل‌فنل‌ها، از مؤثرترین ترکیبات مختل‌کننده غدد درون‌ریز به شمار می‌آید. این ماده به مقدار زیادی تولید می‌شود و از طریق تخلیه پساب تصفیه‌خانه‌های فاضلاب به محیط‌های آبی راه می‌یابد. بنابراین، حذف این ماده از پساب شهری و آب‌های سطحی موضوع مهمی است. این پژوهش، با هدف بررسی عملکرد گرانول‌های آیروژل اکسیدگرافن کیتوسان، برای حذف 4- نونیل‌فنل از محلول‌های آبی انجام شد. در این راستا، مشخصات نانوجاذب سنتز شده توسط آنالیزهای SEM، TEM، FTIR، BET و pHpzc بررسی شد. سپس مطالعات جذب ناپیوسته به‌صورت مرحله به مرحله برای تعیین رفتار جذب انجام شد. در این روش اثر متغیرهایی مانند دوز جاذب، غلظت 4- نونیل‌فنل، pH، مدت زمان تماس و دما با هدف تعیین جذب بهینه بررسی شد. نتایج نشان داد که کارایی 100 درصد جذب در 10 دقیقه اول در محیط با pH خنثی با غلظت 5/1 میلی‌گرم در لیتر و با 8/0 گرم در لیتر جاذب بود. نتایج به‌دست آمده با سینتیک‌ها و ایزوترم‌های مختلف مقایسه و مشخص شد که جذب 4- نونیل‌فنل با جاذب سنتز شده از مدل‌های سینتیک شبه‌مرتبه دوم (999/0>R2) و ایزوترم (998/0>R2) تبعیت کرده و حداکثر ظرفیت جذب جاذب 97/70 میلی‌گرم برگرم بود. مطالعه ترمودینامیک نشان داد که فرایند جذب خودبه‌خودی و انعطاف‌پذیر (ΔG منفی)، گرماگیر (H مثبت) و برگشت‌پذیر (ΔS مثبت) بود.

کلیدواژه‌ها


عنوان مقاله [English]

Experimental Study of 4-Nonylphenol Removal from Aquatic Solutions Using Graphene Oxide Chitosan Aerogel Beads

نویسندگان [English]

  • Elahe Javadi 1
  • Majid Baghdadi 2
  • Lobat Taghavi 3
  • Homayun Ahmad panahi 4
1 PhD Student, Dept. of Environmental Science (Pollution), Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Assoc. Prof., School of Environment, College of Engineering, University of Tehran, Tehran, Iran
3 Assoc. Prof., Dept. of Environmental Science, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran
4 Prof., Dept. of Chemistry, College of Basic Sciences, Central Tehran Branch, Islamic Azad University, Tehran, Iran
چکیده [English]

4-Nonylphenol (4-NP) as one of the most abundant and toxic alkylphenols is the most effective of endocrine disruptive compounds. It is produced in high quantities and then enters the aquatic environment via discharge of sewage treatment effluents. Therefore, its removal from surface water and municipal wastewater effluents is more commonly considered. This study has been done with the aim of the investigation of the grapheneoxide chitosan aerogel beads’ performance for removal of 4-NP from aquatic solutions. In this regard, the characteristics of the synthesized nano-adsorbent have been investigated by SEM, TEM, FTIR, BET and pHpzc techniques. Then, batch adsorption experiments have been done to determine the adsorption behavior. In this method, the effect of some parameters such as adsorbent dosage, 4-NP concentration, pH, contact time, and temperature was evaluated with the aim of determining optimum conditions. The results show that the adsorption efficiency could reach 100% in 10 min at neutral pH with 1.5 mg/L of 4-NP concentration and 0.8 g/L of the adsorbent. The achieved results were compared with different kinetic and isotherm models, which found that the 4-NP adsorption by the synthesized nano-adsorbent are explained by the Pseudo-Second-Order kinetic (R2=0.9992) and Dubinin-Radushkevich isotherm (R2=0.9988) models with the adsorbents’ maximum capacity of 70.97 mg/g. Thermodynamic investigations indicated that the adsorption process was spontaneous and feasible (-ΔG), endothermic (+ΔH), and reversible (+ΔS).

کلیدواژه‌ها [English]

  • 4-nonylphenol
  • graphene oxide
  • Chitosan
  • aerogel
  • Adsorption
  • Thermodynamic
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