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

Chamila Gunathilake, Rohan S. Dassanayake, Noureddine Abidi, Mietek Jaroniec

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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.

Original languageEnglish
Pages (from-to)4808-4819
Number of pages12
JournalJournal of Materials Chemistry A
Volume4
Issue number13
DOIs
StatePublished - 2016

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