| Autor: |
Dos Reis Vargas M; Institute of Chemistry, University of Brasilia, Brasília, DF, CEP 70904970, Brazil.; Federal Institute of Goiás, Campus Goiânia, Goiânia, GO, 74055110, Brazil., de Castro EAS; State University of Goiás, Av. Universitária s/n, Formosa, GO, 73807250, Brazil., Politi JRDS; Institute of Chemistry, University of Brasilia, Brasília, DF, CEP 70904970, Brazil., Gargano R; Institute of Physics, University of Brasilia, Brasília, DF, CEP 70904970, Brazil., Martins JBL; Institute of Chemistry, University of Brasilia, Brasília, DF, CEP 70904970, Brazil. lopes@unb.br.; Instituto de Química, Universidade de Brasília, CP 4478, Brasília, DF, 70904-970, Brazil. lopes@unb.br. |
| Abstrakt: |
Benzene, toluene, ethylbenzene, and xylenes are volatile hydrocarbons known as BTEX, which present concerns about environmental problems. Density functional theory (DFT) functionals were used for the BTEX gas phase adsorption on TiO 2 (110) of rutile and (101) of anatase surfaces. Dispersion terms have shown the importance to treat weak interactions and were used to study these adsorptions using plane wave DFT calculations. All BTEX molecules have the same trend for the adsorption on rutile and anatase surfaces. The inclusion of dispersion terms has a significant contribution for the interaction energy. Density of states results suggest the hybridization between the d state of pentacoordinated titanium atoms (Ti 5C ) and carbon p states of benzene. The adsorption energy values indicate an effective interaction between the BTEX and surfaces, mainly due to the aromatic π interaction, which is present in all adsorbates. However, for p-xylene the methyl hydrogen directs the second major influence. Graphical abstract Charge difference showing the system with the smallest interaction and the one with the largest interaction. |
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