OICC Press International Nano Letters 2228-5326 10 2 (June 2020) 2020 06 06 Improvement on CO2 capture by CaO pellet modified with carbon nanotubes 10.1007/s40089-020-00303-z EN Henrique S. Oliveira Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG, CEP 31270-901, BR Departamento de Engenharia Química, Universidade Federal de São João del-Rei, Ouro Branco, MG, CEP 36.420-000, BR Laura M. Araújo Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG, CEP 31270-901, BR Plínio C. C. Pinto Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG, CEP 31270-901, BR Geison V. Pereira Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG, CEP 31270-901, BR Patricia P. de Souza Centro Federal de Educação Tecnológica de Minas Gerais, Belo Horizonte, MG, CEP 30421-169, BR Jadson C. Belchior Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG, CEP 31270-901, BR Luiz C. A. Oliveira Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG, CEP 31270-901, BR Journal Article 2020 06 06 Abstract In this work, we developed an efficient absorbent material pellet-based made of calcium oxide to capture part of the CO 2 emitted by motor vehicles, to obtain an innovative technology for controlling the emission of greenhouse gases. Problems with CO 2 capture efficiency using CaO was solved after modifications with carbon nanotubes (CNTs) that improve CaO adsorbent porosity leading high CO 2 capture efficiency (98.2%). The CO 2 gas adsorption by pellet was followed by thermogravimetric analysis showed that porosity generated promoted a better CO 2 adsorption compared to unmodified CaO (64.1%). The results strongly suggest that the preparation of CaO pellet-based in the presence of a small amount of nanotubes (0.05%), followed by calcination, promotes the formation of channels that allow to substantially improve CO 2 capture capacity by increasing the exposing adsorbent calcium species. This effect may be due to the crystallite size of the materials. The calcium oxide, after modification with carbon nanotubes, showed particle size values of 25 and 17 nm, respectively, before and after calcination. Graphic abstract