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بررسی تأثیر روشهای مختلف اصلاح شیمیایی و سطحی بر ویژگیهای زغالهای زیستی تهیه شده از نی و بقایای ذرت | ||
تحقیقات کاربردی خاک | ||
دوره 9، شماره 2، شهریور 1400، صفحه 73-86 اصل مقاله (819.92 K) | ||
نوع مقاله: مقاله پژوهشی | ||
نویسندگان | ||
شیلا خواجوی شجاعی* 1؛ عبدالامیر معزی1؛ مجتبی نوروزی مصیر1؛ مهدی تقوی2 | ||
1گروه علوم ومهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
2گروه شیمی،دانشکده علوم، دانشگاه شهید چمران ، اهواز ،ایران | ||
چکیده | ||
در سالهای اخیر استفاده از زغال زیستی اصلاح شده در حذف آلایندههای آلی و معدنی، بهسازی خاک و تولید کودهای کندرها بر پایه زغال زیستی مورد توجه قرار گرفته است. این پژوهش با هدف بررسی تأثیر روشهای مختلف اصلاح زغال زیستی بر ویژگیهای فیزیکی و شیمیایی زغالهای زیستی نی و بقایای ذرت انجام شد. بدینمنظور، زغالهای زیستی نی و بقایای ذرت تهیه شده در دمای 500 درجه سلسیوس به روشهای شیمیایی (شامل اصلاح با کلرید آهن، کلرید منیزیم و کلرید کلسیم) و سطحی (شامل استفاده از اسید سولفوریک، اسید کلریدریک، پتاسیم هیدروکسید و سدیم هیدروکسید) اصلاح شد. سپس ویژگیهای آنها شامل عملکرد، آنالیز تقریبی، اسیدیته (pH)، هدایت الکتریکی (EC)، ظرفیت تبادل کاتیونی (CEC)، ظرفیت تبادل آنیونی (AEC) و سطح ویژه (SSA) اندازهگیری شد. نتایج نشان داد که بیشترین مقدار سطح ویژه، ظرفیت تبادل کاتیونی و ظرفیت تبادل آنیونی مربوط به تیمارهای زغال زیستی نی اصلاح شده با آهن (به ترتیب 94/217 مترمربع بر گرم، 43/111 و 13/22 سانتیمول بار بر کیلوگرم) و زغال زیستی ذرت اصلاح شده با منیزیم (بهترتیب، 83/210 مترمربع بر گرم، 40/137 و 93/16 سانتیمول بار بر کیلوگرم) بود. محتوای کربن و نسبت C/N در نمونههای تیمار شده با اسید، باز و نمک فلزات نسبت به نمونههای اولیه کاهش یافت. محتوای اکسیژن، نسبت O/C و H/C در تمامی تیمارها در اثر اصلاح شیمیایی و سطحی کاهش یافت. بهطور کلی، نتایج این پژوهش نشان داد استفاده از روشهای مختلف اصلاح زغال زیستی میتواند در بهینهسازی ویژگیهای آن، با توجه به هدف از کاربرد آن، بسیار موثر باشد. | ||
کلیدواژهها | ||
اصلاح سطحی؛ اصلاح شیمیایی؛ زیستتوده زغال زیستی؛ سطح ویژه؛ ظرفیت تبادل آنیونی | ||
مراجع | ||
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