EVALUATION OF PERFORMANCE OF A POLYURETHANE SENSING PHASE BY GIBBS ENERGY OF SOLVATION AND INFRARED SPECTROSCOPY FOR DETERMINATION OF TOLUENE IN WATER

Quimica nova

Azevedo Júnior, Rogerio V. de¹  Souza, Juliana D. C.² 

[1] Universidade Federal Rural de Pernambuco, Serra Talhada, Brazil;Universidade Federal de Pernambuco, Recife, Brazil

关键词: water contaminant;    toluene;    polyurethane;    semiempirical methods;    solvation energies.;   

DOI  :  10.21577/0100-4042.20170194

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

A novel sensing phase of polyurethane was predicted by quantum chemical calculations as capable of detecting toluene, with the experimental results revealing a limit of detection of 1.4 mg L-1 in the determination of toluene in water samples. The quantum chemical computational strategy was validated by assessing the impact of the polymer matrix sensing phases polyvinyl chloride (PVC), polydimethylsiloxane (PDMS), and polyisobutylene (PIB), as solvents, on the Gibbs energy of solvation of the organic contaminants toluene, benzene, chlorobenzene and ethylbenzene. Computational results for the set studied indicate that the limit of detection of contaminants for each polymeric matrix correlated well with the Gibbs energy of solvation. As such, the computational methodology was employed to assess the potential applicability of polyurethane matrices on the determination of toluene as a contaminant in water, with positive results. Analyzes were then carried out experimentally by mid-infrared spectroscopy. Finally, experiments revealed good regenerative capacity of polyurethane, further adding to the usefulness of the technique here advanced.

【 授权许可】

CC BY