Preparation of a highly microporous carbon from a carpet material and its application as CO 2 sorben

Abstract In order to increase the use of carpet wastes (pre- and/or post-consumer wastes), this work studies for the first time the preparation and characterisation of a microporous material from a commercial carpet (pile fiber content: 80% wool/20% nylon; primary and secondary backings: woven polypropylene; binder: polyethylene) and its application for CO 2 capture. The porous material was prepared from an entire carpet material using a standard chemical activation with KOH and then, characterised in terms of their porous structure and surface functional groups. Adsorption of CO 2 was studied using a thermogravimetric analyser at several temperatures (25–100 °C) and under different CO 2 partial pressures (i.e. pure CO 2 flow and a ternary mixture of 15% CO 2 , 5% O 2 and 80% N 2 ). In order to examine the adsorbent regenerability, multiple CO 2 adsorption/desorption cycles were also carried out. The surface area and micropore volume of the porous adsorbent were found to be 1910.17 m 2  g − 1 and 0.85 cm 3  g − 1 , respectively. The CO 2 adsorption profiles illustrate that the maximum CO 2 capture on the sample was reached in less than 10 min. CO 2 adsorption capacities up to 8.41 wt.% and 3.37 wt.% were achieved at 25 and 70 °C, respectively. Thermal swing regeneration studies showed that the prepared adsorbent has good cyclic regeneration capacities.

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