The Preparation of Soluble Cellouronic Acid Sodium Salt by 4-Acetamide-TEMPO Mediated Oxidation of Ultrasound-Pretreated Parenchyma Cellulose from Bagasse Pith

• Autorzy: Gao X. , Chen K. , Zhang H. , Peng L.

Identyfikatory

DOI

10.2478/aoa-2014-0031

• Języki publikacji: EN

Abstrakty

EN

The parenchyma cellulose isolated from bagasse pith was used as an alternative resource for preparation of water-soluble cellouronic acid sodium salt (CAS). The influence of ultrasound treatment on the cellulose was investigated for obtaining CAS by regioselective oxidization using 4-acetamide-TEMPO and NaClO with NaClO₂ as a primary oxidant in an aqueous buffer at pH 6.0. The yield, carboxylate content and polymerization degree (DP) of CAS were measured as a function of ultrasonic power, agitating time and cellulose consistency by an orthogonal test. The ultrasound-treated conditions were further improved by discussion of ultrasonic power, the most important factor influencing the yield and DP. An optimized CAS yield of 72.9% with DP value (DPv) of 212 was found when the ultrasonic strength is 550 W, agitating time is 3 h and cellulose consistency is 2.0%. The oxidation reactivity of cellulose was improved by ultrasonic irradiation, whereas no significant changes in crystallinity of cellulose were measured after ultrasonic treatment. Moreover, the ultrasound treatment has a greater effect on yielding CAS from parenchyma cellulose than from bagasse fibrous’ one. The CAS was further characterized by Fourier transform infrared spectroscopy (FT-IR) and Scanning electron microscopy (SEM).

Słowa kluczowe

EN

ultrasonic pretreatment; bagasse pith; parenchyma cellulose; cellouronic acid sodium salt; 4-acetamide-TEMPO

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2014
• Tom: Vol. 39, No. 2
• Strony: 267--275
• Opis fizyczny: Bibliogr. 22 poz., fot., tab., wykr.

Twórcy

autor

Gao X.

• Faculty of Environmental Science and Engineering, Kunming University of Science and Technology 650500, Kunming, China
• Faculty of Chemical Engineering, Kunming University of Science and Technology 650500, Kunming, China

autor

Chen K.

• Faculty of Chemical Engineering, Kunming University of Science and Technology 650500, Kunming, China

autor

Zhang H.

• Faculty of Chemical Engineering, Kunming University of Science and Technology 650500, Kunming, China

autor

Peng L.

• Faculty of Chemical Engineering, Kunming University of Science and Technology 650500, Kunming, China

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