The emission and excitation spectra of quinoline and 2,3-dichloroquinoxaline embedded in a calcinated (600 °C) porous Vycor glass and dissolved in fluid solutions were recorded at various temperatures. The spectral characteristics and phosphorescence lifetimes of adsorbates were observed to be identical with those in 0.5 N H2S04 solutions, indicating that H+ is transferred from the surface to the N-heterocyclics. The strong surface-adsorbate interaction is further revealed by the dynamic study of adsorbates at 77 and 4.2 K.
A cellulosic ion exchange fiber (CIEF) was prepared by using room-temperature ionic liquid 1-(3-chloro-2-hydroxypropyl)-3-methylimidazolium chloride as reaction reagent and medium. The results showed the degree of substitution of the CIEF was up to 0.78. The product was characterized by Fourier transform infrared spectrometry, thermogravimetric analysis, scanning electronic microscope. The thermal stability of the CIEF was over 200C. The adsorption experiments of CIEF for Cr(VI) were performed. The adsorption capacity of CIEF for Cr(VI) was found to be 196.1 mg g À1 at 30
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