کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5157731 1500597 2017 30 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Impact of pre-treatments on properties of lignocelluloses and their accessibility for a subsequent carboxymethylation
ترجمه فارسی عنوان
تأثیر پیش درمانها بر خواص لیگنوسلولزها و قابلیت دسترسی آنها برای کربوکسی متیلاسیون بعدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی
In this issue, different chemical (alkaline and sulfite pulping, ozonolysis) and mechanical (vibratory ball milling) pre-treatments were utilized for activating wheat straw and beech sawdust prior to carboxymethylation. Detailed analysis by a range of methods, including Klason-lignin, cellulose and hemicellulose quantification, Powder-X-ray diffraction (PXRD) and attenuated total reflection (ATR) IR spectroscopy, enabled the investigation of material alterations. Subsequently, carboxymethylation was carried out with both untreated and activated materials, allowing the evaluation of activation steps by determining degrees of substitution with carboxymethyl groups (DSCM). Moreover, carboxymethylation conditions were optimized, realizing high DSCM of up to 1.05. Results further revealed that ball milling enhanced the subsequent conversion; whereas chemical pre-treatments did not effectively increase material accessibilities. Further studies on chemically untreated materials emphasized that a highly reactive surface was already generated in the course of the carboxymethylation, inter alia through the concomitant dissolution of matrix components.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 161, 1 April 2017, Pages 82-89
نویسندگان
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