Inspired by efficient cellulose-dissolving system: Facile one-pot synthesis of biomass-based hydrothermal magnetic carbonaceous materials

Jian-Feng Ma; Jian-Xiong Xing; Kun Wang; Hai-Yan Yang; Ben-Hua Fei; Xing-E Liu

doi:10.1016/j.carbpol.2017.01.087

Inspired by efficient cellulose-dissolving system: Facile one-pot synthesis of biomass-based hydrothermal magnetic carbonaceous materials

Carbohydr Polym. 2017 May 15:164:127-135. doi: 10.1016/j.carbpol.2017.01.087. Epub 2017 Jan 30.

Authors

Jian-Feng Ma¹, Jian-Xiong Xing², Kun Wang³, Hai-Yan Yang⁴, Ben-Hua Fei¹, Xing-E Liu⁵

Affiliations

¹ Key Lab of Bamboo and Rattan Science & Technology, International Center for Bamboo and Rattan, Beijing 100102, China.
² Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
³ Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China. Electronic address: wangkun@bjfu.edu.cn.
⁴ College of Materials Engineering, Southwest Forestry University, Kunming 650224, China.
⁵ Key Lab of Bamboo and Rattan Science & Technology, International Center for Bamboo and Rattan, Beijing 100102, China. Electronic address: Majf@icbr.ac.cn.

PMID: 28325308
DOI: 10.1016/j.carbpol.2017.01.087

Abstract

The core-shell structure of carbon encapsulated magnetic nanoparticles (CEMNs) displays unique properties. Enhancing the magnetization of iron core, in parallel, improving the encapsulation of carbon shell are the two major challenges in the synthesis of CEMNs. Inspired by efficient cellulose-dissolving system, carbon encapsulated magnetic nano-Fe₃O₄ particles (Fe₃O₄@C) with ∼10.0nm Fe₃O₄ cores and 1.9-3.3nm carbon shell, were successfully one-pot synthesized via a novel hydrothermal carbonization (HTC) process. The dissolving process in ionic liquids ([Emim]Ac and [Amim]Cl) completely cleaved the intra- and intermolecular H-bonds in cellulose, and favored the incorporation of Fe₃O₄ nanoparticles into the cellulose H-bonds systems during the regeneration process. Some stable linkages were formed in Fe₃O₄@C, taking Fe₃O₄ nanoparticles as a structure guiding agent. The morphology and properties of Fe₃O₄@C depended strongly on the type of carbon precursors and pyrolysis temperature. Well encapsulated nanostructure was obtained at HTC temperature 280°C, when [Emim]Ac-treated holocellulose was used as the carbon source. Meanwhile, the thickness of the amorphous shell and magnetization increased with HTC temperature. More importantly, a novel elements for understanding the growth mechanism for the Fe₃O₄@C composite under HTC conditions was proposed.

Keywords: Carbon-coated Fe(3)O(4); Core-shell structure; HTC; Ionic liquids; Magnetization; One-pot synthesis.