title: Porous carbon material containing CaO for acidic gas capture: preparation and properties.
abstract: A one-step process for the preparation of CaO-containing porous carbons is described. Mixtures of poly(ethylene terephthalate) with natural limestone were pyrolyzed and thus hybrid sorbents could be easily obtained. The polymeric material and the mineral served as a carbon precursor and CaO delivering agent, respectively. We discuss effects of the preparation conditions and the relative amounts of the raw materials used for the preparations on the porosity of the hybrid products. The micropore areas and volumes of the obtained products tended to decrease with increasing CaO contents. Increase in the preparation temperature entailed a decrease in the micropore volume, whereas the mesopore volume increased. The pore creation mechanism is proposed on the basis of thermogravimetric and temperature-programmed desorption measurements. The prepared CaO-containing porous carbons efficiently captured SO2 and CO2 from air. Washing out of CaO from the hybrid materials was confirmed as a suitable method to obtain highly porous carbon materials.
authors.affiliation: Institute of Chemical and Environmental Engineering, West Pomeranian University of Technology in Szczecin, Pulaskiego 10, 70-322 Szczecin, Poland. Electronic address: jacek.przepiorski@zut.edu.pl.
authors.forename: Jacek
authors.initials: J
authors.lastname: Przepiórski
authors.forename: Adam
authors.initials: A
authors.lastname: Czyżewski
authors.forename: Robert
authors.initials: R
authors.lastname: Pietrzak
authors.forename: Masahiro
authors.initials: M
authors.lastname: Toyoda
authors.forename: Antoni W
authors.initials: AW
authors.lastname: Morawski
mesh_terms: D000143:Acids / Q000737:chemistry; D000327:Adsorption; D061808:Air Filters; D000393:Air Pollutants / Q000737:chemistry*; D002119:Calcium Carbonate / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D005740:Gases; D008422:Materials Testing; D010087:Oxides / Q000737:chemistry*; D011093:Polyethylene Terephthalates / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D016062:Porosity; D013458:Sulfur Dioxide / Q000737:chemistry; D013696:Temperature; D013818:Thermogravimetry
chemical_list: D000143:Acids; D000393:Air Pollutants; D017610:Calcium Compounds; D005740:Gases; D010087:Oxides; D011093:Polyethylene Terephthalates; D011108:Polymers; D013458:Sulfur Dioxide; D002244:Carbon; C016538:lime; D002119:Calcium Carbonate
keywords: Acidic gases; Air purification; Calcium oxide; Porous carbon; Sorption