بررسی ویژگی های سلولز استخراجی از پوست چوبی گردو با استفاده از پیش تیمار پلاسمای غیرحرارتی

نویسندگان
دانشگاه صنعتی اصفهان
چکیده
مطالعه حاضر، با هدف استخراج سلولز از پوست چوبی گردو با استفاده از پیشتیمار پلاسمای سد دی الکتریک و بررسی ویژگیهای آن انجام شد. بدین منظور پوست چوبی گردو در سه مرحله در معرض پلاسمای سد دیالکتریک در دو ولتاژ 18 و 20 کیلوولت به مدت 10 دقیقه قرار گرفت. در مرحله اول، این فرآیند قبل از تیمار قلیایی با سدیم هیدروکسید، در مرحله دوم قبل از تیمار رنگبری با سدیم کلریت و در نهایت این پیشتیمار هم قبل از تیمار قلیایی و هم قبل از رنگبری اعمال شد. آزمونهای بازده استخراج، طیفسنج مادون قرمزتبدیل فوریه(FTIR)، ساختار بلوری(XRD)، ویژگیهای حرارتی(TGA)، ریزساختار نمونهها(FE-SEM)و بررسی قطر الیاف انجام شد. بر اساس نتایج، بازده استخراج سلولز تحت تاثیر ولتاژ اعمال شده قرار گرفت (05/0>p) و به دلیل تاثیر پلاسما در شکست پیوندها بازده کاهش یافت. طیفسنج مادون قرمز حذف پیکهای مربوط به ناخالصیها و خلوص فیبرهای سلولز استخراجی را تایید کرد. نتایج، عدم تغییر ساختار بلوری سلولز را نشان داد اما کاهش شاخص بلورینگی رخ داد. اثر پلاسما در وزنسنج حرارتی نمونهها در دماهای زیر 100 درجه سلسیوس مشاهده شد و بعد از دمای شروع تخریب رفتار فیبرهای تیمار شده و نشده تا تجزیه حرارتی نهایی تفاوت قابل ملاحظهای نداشت. در تصاویر میکروسکوپ الکترونی نمونههای تیمار شده با پلاسما در ابتدا تورم و ناهمواری در سطح مشاهده شد که در ولتاژهای بالاتر سبب شکست بیشتر اتصالات شده و نانوفیبرهایی با قطر 80 نانومتر به وجود آمدند. به طور کلی نتایج نشان داد اعمال پلاسما با ولتاژ 20 کیلوولت در هر دو مرحله قبل از تیمار قلیایی و قبل از رنگبری، تیمار مناسب تری برای استخراج سلولز و تولید نانوالیاف سلولزی است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Evaluation of physicochemical properties of extracted cellulose from the walnut shell using ‎non-thermal plasma pretreatment

نویسندگان English

Ensieh Anari
Nafiseh Soltanizadeh
Isfahan University of Technology
چکیده English

The present study aims to extract cellulose fibers from the walnut shell using dielectric barrier discharge (DBD) plasma pretreatment and to evaluate its properties. For this purpose, powdered walnut shells were exposed to 18 and 20 kV DBD plasma for 10 min in three stages. First, before sodium hydroxide alkaline treatment, next, before sodium chlorite bleaching treatment, and then, before both alkaline and bleaching treatments. The extraction efficiency, FTIR, XRD, thermal properties, FESEM and diameters of the cellulose fiber were evaluated. Based on the results, the extraction efficiency was significantly affected by applied voltage (p<0.05) and due to plasma destruction of glycosidic, the efficiency was reduced. The removal of peaks related to impurities from the walnut shell and the purity of all extracted cellulose was confirmed with FTIR. The results showed that applying DBD plasma during cellulose extraction did not affect its crystal structure, but the reduction of crystallization index was observed. Furthermore, the effect of plasma on the thermal-gravimetry of the samples was observed at temperatures below 100 ° C, and after the onset temperature of degradation, the behavior of the treated and untreated fibers until the final thermal decomposition was not significantly different. The microstructure of plasma-treated samples showed an increase in cellulose fiber's roughness and swelling, followed by the transformation of microfibrils to nanofibrils with a diameter of 80 nm at the higher voltage. In general, the results showed that applying 20 kV DBD plasma in both stages before the alkaline and delignification process is a more suitable treatment for extracting cellulose and producing cellulose nanofibers.

کلیدواژه‌ها English

DBD plasma
Cellulose
walnut shell
Structural properties. ‎
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