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ارزیابی توانایی بیوچار نی اصلاح شده با کلرید آهن در جذب نیترات از محلول آبی | ||
تحقیقات آب و خاک ایران | ||
دوره 51، شماره 11، بهمن 1399، صفحه 2853-2864 اصل مقاله (1.36 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2020.295520.668465 | ||
نویسندگان | ||
شیلا خواجوی شجاعی1؛ عبدالامیر معزی* 2؛ مجتبی نوروزی مصیر3؛ مهدی تقوی زاهد کلائی4 | ||
1گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
2دانشیار گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
3استادیار گروه علوم و مهندسی خاک دانشگاه شهید چمران اهواز، اهواز، ایران | ||
4استادیار گروه شیمی، دانشکده علوم، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
چکیده | ||
در سالهای اخیر استفاده از بیوچار اصلاح شده جهت پالایش آلایندههای معدنی مانند نیترات، مورد توجه قرار گرفته است. با توجه به افزایش غلظت نیترات در منابع آب و پیامدهای زیستمحیطی ناشی از آن، در این پژوهش کارایی بیوچار اصلاح شده نی در جذب نیترات از محلول آبی بررسی شد. بدین منظور، زیستتوده گیاه نی با استفاده از محلول کلرید آهن یک مولار اصلاح شد، سپس در دمای 500 درجه سلسیوس گرماکافت شد و ویژگیهای فیزیکوشیمیایی آن اندازهگیری گردید. آزمایشهای جذب نیترات بهصورت پیمانهای بررسی شدند. نتایج نشان داد، در اثر اصلاح بیوچار با کلرید آهن عملکرد، ظرفیت تبادل کاتیونی، ظرفیت تبادل آنیونی و سطح ویژه بیوچار افزایش یافت. کارایی جذب نیترات با افزایش زمان افزایش یافت، در حالی که افزایش غلظت اولیه نیترات در محلول با کارایی جذب این یونها رابطه عکس نشان داد. مدل سینتیکی شبه درجه دوم، توصیف مناسبی از سرعت جذب نیترات در بیوچار تهیه شده در دمای 500 درجه سلسیوس (98/0R2 =) و بیوچار اصلاح شده با آهن (99/0R2 =) ارائه داد. مدل لانگمویر (99/0R2 =) بهترین برازش را برای دادههای جذب نیترات در هر دو نوع بیوچار نشان داد. بهطورکلی، نتایج این پژوهش نشاندهنده توانایی بالای بیوچار نی اصلاح شده با آهن برای جذب نیترات (30/81 میلیگرم بر گرم) بود. بنابراین میتوان نتیجهگیری کرد بیوچار اصلاح شده نی پتانسیل بالایی در حذف نیترات از منابع آبی دارد. | ||
کلیدواژهها | ||
آلودگی؛ جاذب آلی؛ سینتیک؛ نیتروژن؛ هم دما | ||
عنوان مقاله [English] | ||
Evaluation of Nitrate Sorption Potential from Aqueous Solution Using Common Reed-Iron Modified Biochar | ||
نویسندگان [English] | ||
Shila Khajavi-Shojaei1؛ Abdolamir Moezzi2؛ Mojtaba Norouzi Masir3؛ Mehdi Taghavi zahedkolaei4 | ||
1Department of Soil Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran | ||
2Associate Professor, Department of Soil Sciences, Faculty of Agriculture, Shahid Chamran University of Ahvaz | ||
3Associate Professor, Department of Soil Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran | ||
4Assistant Professor, Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran | ||
چکیده [English] | ||
In recent years using modified biochar has been considered as an adsorbent to removal of inorganic pollutants such as nitrate from aqueous solution. Because of the increase of nitrate concentration in water resources and its environmental consequences, in this study the efficiency of nitrate adsorption by iron-modified common reed biochar from aqueous solution was investigated. For this purpose common reed biomass was modified by one molar iron chloride solution and then pyrolyzed at 500 °C and its physicochemical characteristics were measured. Nitrate adsorption was evaluated in batch experiments. The results indicated that the yield, cation exchage capacity (CEC), anion exchange capacity (AEC) and surface area of the biochar increased through modification by iron chloride. The adsorption efficiency of nitrate increased by increasing contact time, but it reduced by increasing initial concentration of nitrate in the solution. The pseudo-second-order kinetics model provided a good description for adsorption processes of biochar produced at 500 ºC (R2= 0.98) and iron modified biochar (R2= 0.99). Among the adsorption isotherms, Langmuir model (R2= 0.99) illustrated the best fit with the experimental data for both biochars. In general, the results of this study showed the high potential of iron-modified biochar for nitrate sorption (81.30 mg g-1). Thus, it could be concluded that the iron-modified biochar has high potential for nitrate removal from aqueous solutions. | ||
کلیدواژهها [English] | ||
Isotherm, Kinetics, Nitrogen, Organic adsorbent, Pollution | ||
مراجع | ||
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