NDLI: From Biomass Wastes to Highly Efficient $CO_{2}$ Adsorbents: Graphitisation of Chitosan and Alginate Biopolymers

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From Biomass Wastes to Highly Efficient $CO_{2}$ Adsorbents: Graphitisation of Chitosan and Alginate Biopolymers

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Primo, Ana Forneli, Amparo Corma, Avelino García, Hermenegildo
Description	Country affiliation: Spain Author Affiliation: Primo A ( Instituto Universitario de Tecnología Química UPV-CSIC, Univ. Politécnica de Valencia, Av. De los Naranjos s/n, 46022 Valencia, Spain.)
Abstract	Carbon spheres from natural biopolymers (alginate and chitosan) are easily synthesised by thermal treatment between 400 and 800 °C under an inert atmosphere. All the samples, including the untreated natural biopolymers, as well as the resulting carbon materials, exhibit a remarkable $CO_{2}-adsorption$ capacity. The sample that exhibits the highest adsorption capacity was that obtained by carbonisation of alginate at 800 °C and subsequent treatment with KOH at 800 °C. This material exhibits a specific surface area of $765 m^{2} g^{−1},$ specific micropore volume of $0.367 cm^{3} g^{−1},$ ultra-micropore volume of $0.185 cm^{3} g^{−1},$ average ultra-micropore size of 0.7 nm and $CO_{2}-adsorption$ capacity of $5 mmol g^{−1}$ measured at 0 °C and atmospheric pressure. This value is close to the absolute record for $CO_{2}$ adsorption and, by far, the highest if we compare unit areas or consider the density of the material. The combination of the high N content already included in the chitosan structure and the elevated microporosity in the case of alginate are crucial factors to obtain these satisfactory values with an easy and green preparation procedure. Also, owing to the high conductivity of the alginate-derived carbon (better than graphite), it has been possible to develop a process of reversible adsorption–desorption by applying a voltage, which is a low-energy desorption method compared with the conventional method of vacuum and high temperatures. All these properties, together with the spherical shape of the material of 0.1 mm, which is the most suitable form to favour mass transfer in fluidised-bed reactors, make this material a highly promising adsorbent for industrial applications.
File Format	HTM / HTML
ISSN	18645631
Issue Number	11
Volume Number	5
e-ISSN	1864564X
Journal	ChemSusChem
Language	English
Publisher	Wiley-VCH
Publisher Date	2012-11-01
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Research Support, Non-u.s. Gov't Temperature Discipline Sustainable Chemistry Waste Products Electric Conductivity Alginates Biomass Hexuronic Acids Pressure Carbon Dioxide Journal Article Chemistry Glucuronic Acid Adsorption Graphite Chitosan
Content Type	Text
Resource Type	Article
Subject	Energy Environmental Chemistry Materials Science Chemical Engineering

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From Biomass Wastes to Highly Efficient $CO_{2}$ Adsorbents: Graphitisation of Chitosan and Alginate Biopolymers

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From Biomass Wastes to Highly Efficient $CO_{2}$ Adsorbents: Graphitisation of Chitosan and Alginate Biopolymers