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CO2 Adsorption by para-Nitroaniline Sulfuric Acid-Derived Porous Carbon Foam

Energy Safety Research Institute, Swansea University Bay Campus, Swansea SA1 8EN, UK
Department of Chemistry, Rice University, Houston, TX 77005, USA
Department of Materials Science and Nanoengineering, Rice University, Houston, TX 77005, USA
Author to whom correspondence should be addressed.
Academic Editor: Craig E. Banks
Received: 25 November 2016 / Revised: 14 December 2016 / Accepted: 16 December 2016 / Published: 21 December 2016
(This article belongs to the Special Issue Materials and Processes for Carbon Dioxide Capture and Utilisation)
The expansion product from the sulfuric acid dehydration of para-nitroaniline has been characterized and studied for CO2 adsorption. The X-ray photoelectron spectroscopy (XPS) characterization of the foam indicates that both N and S contents (15 and 9 wt%, respectively) are comparable to those separately reported for nitrogen- or sulfur-containing porous carbon materials. The analysis of the XPS signals of C1s, O1s, N1s, and S2p reveals the presence of a large number of functional groups and chemical species. The CO2 adsorption capacity of the foam is 7.9 wt% (1.79 mmol/g) at 24.5 °C and 1 atm in 30 min, while the integral molar heat of adsorption is 113.6 kJ/mol, indicative of the fact that chemical reactions characteristic of amine sorbents are observed for this type of carbon foam. The kinetics of adsorption is of pseudo-first-order with an extrapolated activation energy of 18.3 kJ/mol comparable to that of amine-modified nanocarbons. The richness in functionalities of H2SO4-expanded foams represents a valuable and further pursuable approach to porous carbons alternative to KOH-derived activated carbons. View Full-Text
Keywords: porous carbon; nitrogen; sulfur; CO2; nitroaniline; sulfuric acid porous carbon; nitrogen; sulfur; CO2; nitroaniline; sulfuric acid
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MDPI and ACS Style

Andreoli, E.; Barron, A.R. CO2 Adsorption by para-Nitroaniline Sulfuric Acid-Derived Porous Carbon Foam. C 2016, 2, 25.

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