To detect sub-ppm levels of HCl gas, spectral changes of tetraphenylporphine and derivatives dispersed in ethylcellulose were examined in the visible region. For free-base tetraphenylporphyrin the absorbance of the Soret and Q-bands are sensitive to sub-ppm levels of HCl and reversibility at room temperature. The Soret and Q-bands are also sensitive to vapours from aqueous solutions of HNO3, HF or HCOOH, while they are insensitive to vapours from CH3COOH or C2H5COOH and also to 1 ppm of NH3, Cl2, NO2 and NO. The sensitivity can be modified by substituent groups and using different concentrations of porphyrin in the composite.
Tanaka, K., Igarashi, C., Tagliatesta, P., Boschi, T., Sadaoka, Y. (1996). Optochemical HCl gas detection based on tetraphenylporphine dispersed in ethylcellulose. JOURNAL OF MATERIALS CHEMISTRY, 6(6), 953-956.
Optochemical HCl gas detection based on tetraphenylporphine dispersed in ethylcellulose
TAGLIATESTA, PIETRO;BOSCHI, TRISTANO;
1996-01-01
Abstract
To detect sub-ppm levels of HCl gas, spectral changes of tetraphenylporphine and derivatives dispersed in ethylcellulose were examined in the visible region. For free-base tetraphenylporphyrin the absorbance of the Soret and Q-bands are sensitive to sub-ppm levels of HCl and reversibility at room temperature. The Soret and Q-bands are also sensitive to vapours from aqueous solutions of HNO3, HF or HCOOH, while they are insensitive to vapours from CH3COOH or C2H5COOH and also to 1 ppm of NH3, Cl2, NO2 and NO. The sensitivity can be modified by substituent groups and using different concentrations of porphyrin in the composite.Questo articolo è pubblicato sotto una Licenza Licenza Creative Commons
