Double-Catalyzed Base-Acid Synthesis of Chestnut Shell Pigment Resin Cross-Linked with Formaldehyde

Abstract:

An approach to synthesize melanin-formaldehyde resin has been developed. The pigment extracted from chestnut shells, a bio-waste from food industry, was employed as the melanin. The synthesis implemented by a double-catalyzed process, namely, base-catalysis and then acid catalysis. The process was optimized and its performance was evaluated on the basis of the cation exchange capacity of the obtained resin. The optimum reaction condition was found to be base-catalysis using NaOH at pH 11.2, 70 °C and the formaldehyde (37%, m/v) to melanin ratio of 2.33 mL/g for 4 hours and then acid-catalysis by HCl at pH 1.5 and 80 °C for 4 hours. The resin can be used as an effective and inexpensive sorbent for Cu (II) removal from aqueous solutions.

• Periodical: Applied Mechanics and Materials (Volumes 587-589)
• Pages: 663-668
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.587-589.663
• Online since: July 2014
• Authors: Mi Zhou, Ping Su, Jian Hua Qi, Yong Hu, Zeng-Yu Yao*
• Keywords: Chestnut Shell, Copper, Melanin, Pigment, Resin, Sorption

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