Fast and practical synthesis of carboxymethyl cellulose from office paper waste by ultrasonic-assisted technique at ambient temperature. (February 2021)

• Record Type: Journal Article
• Authors: Wongvitvichot, Wasupon; Pithakratanayothin, Sakollaphat; Wongkasemjit, Sujitra; Chaisuwan, Thanyalak
• Is Part Of: Polymer degradation and stability. Volume 184(2021)
• Publication Date: 2021-02
• Subjects: Carboxymethyl cellulose -- Ultrasonic assisted method -- Office paper waste; Polymers -- Deterioration -- Periodicals; Stabilizing agents -- Periodicals; Polymères -- Dégradation -- Périodiques; Stabilisants -- Périodiques; 668.9
• DOI: 10.1016/j.polymdegradstab.2020.109473
• Languages: English
• ISSNs: 0141-3910

Abstract

Highlight: The CMC from office waste paper was synthesized completely within 30 min at ambient temperature by ultrasonic-assisted technique. The degree of substitution of obtained CMC product was 0.75. Abstract: This report demonstrates the fastest technique to successfully achieve carboxymethyl cellulose (CMC) from office paper waste, within 30 min at ambient temperature using ultrasonic-assisted method as a source of energy. The obtained CMC was characterized using FTIR, TGA, and NMR techniques to confirm its structure. The FTIR spectrum showed characteristic peaks of carboxymethyl groups and its salt at the wavenumbers of 1585 (C=O) and 1412 (C-O) cm −1 . The TGA results of CMC exhibited the loss of carbon dioxide at ca. 260 – 300 °C. Moreover, a higher ash yield of the obtained CMC indicated the substitution of carboxymethyl in the structure. The CMC product structure was confirmed using 13 C- and HMBC 2D-NMR. The HMBC 2D-NMR results indicated a correlation between carbonyl and methylene carbons of carboxymethyl groups and protons of pyranose ring, implying that pyranose ring was substituted successfully by monocholoroacetic acid (MCA). The optimal conditions were obtained by using 4.11 ml of 30%w/v NaOH and 1.4 g of MCA in 40 ml of isopropanol at ambient temperature. The resulting CMC showed 0.75 degree of substitution at 18.75 W/ml ultrasonic intensity. Graphical abstract: Image, graphical abstract