Issue 13, 2016

Amidoxime-functionalized microcrystalline cellulose–mesoporous silica composites for carbon dioxide sorption at elevated temperatures

Abstract

Amidoxime-functionalized microcrystalline cellulose (MCC)–mesoporous silica composites were prepared for the first time by a two-step process. First, microcrystalline cellulose (MCC)–mesoporous silica with cyanopropyl groups (MCC-CP) was obtained by solvent evaporation-induced self-assembly of MCC, tetraethylorthosilicate, and (3-cyanopropyl)triethoxysilane in the presence of a Pluronic P123 triblock copolymer under acidic conditions. In the next step, the resulting material was treated with hydroxylamine hydrochloride to convert cyanopropyl groups into amidoxime functionalities to obtain a mesoporous MCC-AO composite. A series of MCC-CP and MCC-AO samples was examined for CO2 sorption at ambient (25 °C) and elevated (120 °C) temperatures. While the MCC-CP and MCC-AO samples showed relatively low CO2 uptake under ambient conditions, they performed very well at elevated temperatures (120 °C) reaching CO2 sorption capacities of 2.15–2.41 mmol g−1 (MCC-CP) and 2.84–3.85 mmol g−1 (MCC-AO). The CO2 sorption capacity of MCC-AO at 120 °C exceeds the values reported so far for many other sorbents, which makes this material attractive for CO2 capture in addition to its biocompatibility, biodegradability, non-toxicity, low cost, cycle stability, and good thermal and mechanical stability.

Graphical abstract: Amidoxime-functionalized microcrystalline cellulose–mesoporous silica composites for carbon dioxide sorption at elevated temperatures

Supplementary files

Article information

Article type
Paper
Submitted
11 jan. 2016
Accepted
22 feb. 2016
First published
24 feb. 2016

J. Mater. Chem. A, 2016,4, 4808-4819

Amidoxime-functionalized microcrystalline cellulose–mesoporous silica composites for carbon dioxide sorption at elevated temperatures

C. Gunathilake, R. S. Dassanayake, N. Abidi and M. Jaroniec, J. Mater. Chem. A, 2016, 4, 4808 DOI: 10.1039/C6TA00261G

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