In hydrochloric acid medium,a highly sensitive fluorescence quenching method was developed for the determination of ClO2,based on its oxidation of I to I3 by ClO2 and the further reation of I3 with rhodamine 6G to for...In hydrochloric acid medium,a highly sensitive fluorescence quenching method was developed for the determination of ClO2,based on its oxidation of I to I3 by ClO2 and the further reation of I3 with rhodamine 6G to form the ion-association complex.The detection Iimit is 0.8 μg/L.The linear range of calibration curve is 0-80 μg/L.It has been applied to the determination of trace ClO2 in tap water with satisfactory results.展开更多
A series of hybrids based on Tb-doped Zn-Al layered double hydroxides （Tb-LDHs） combined with tryptophan （hereafter shortened as Try） were synthesized by soft-chemical method. The composition, structure, and fluor...A series of hybrids based on Tb-doped Zn-Al layered double hydroxides （Tb-LDHs） combined with tryptophan （hereafter shortened as Try） were synthesized by soft-chemical method. The composition, structure, and fluorescence of the Tb-LDH/Try hy-brids were analyzed by various characterizations. Compositional analysis indicated that the content of tryptophan present in the hybrids gradually increased while the Tb-LDH reacted with 0.05, 0.1, and 0.25 mol/L Try solution, respectively. XRD results revealed that new reflections appeared in the Tb-LDH/Try hybrids. TGA curves of the Tb-LDH/Try hybrids were different from that of Tb-LDH and Try. IR spectra manifested that the IR spectra of the hybrids were characteristic of the Try and Tb-LDH. Fluorescent spectra sug-gested that the green emission due to5D4→7F5 transition of Tb3＋ greatly decreased but not quenched, and the emission attributed to Try obviously increased. Meanwhile the fluorescent spectra of Tb-LDH/Try hybrids presented broad continuous bands in visible region.展开更多
文摘In hydrochloric acid medium,a highly sensitive fluorescence quenching method was developed for the determination of ClO2,based on its oxidation of I to I3 by ClO2 and the further reation of I3 with rhodamine 6G to form the ion-association complex.The detection Iimit is 0.8 μg/L.The linear range of calibration curve is 0-80 μg/L.It has been applied to the determination of trace ClO2 in tap water with satisfactory results.
基金supported by the National Natural Science Foundation of China(51162021)
文摘A series of hybrids based on Tb-doped Zn-Al layered double hydroxides （Tb-LDHs） combined with tryptophan （hereafter shortened as Try） were synthesized by soft-chemical method. The composition, structure, and fluorescence of the Tb-LDH/Try hy-brids were analyzed by various characterizations. Compositional analysis indicated that the content of tryptophan present in the hybrids gradually increased while the Tb-LDH reacted with 0.05, 0.1, and 0.25 mol/L Try solution, respectively. XRD results revealed that new reflections appeared in the Tb-LDH/Try hybrids. TGA curves of the Tb-LDH/Try hybrids were different from that of Tb-LDH and Try. IR spectra manifested that the IR spectra of the hybrids were characteristic of the Try and Tb-LDH. Fluorescent spectra sug-gested that the green emission due to5D4→7F5 transition of Tb3＋ greatly decreased but not quenched, and the emission attributed to Try obviously increased. Meanwhile the fluorescent spectra of Tb-LDH/Try hybrids presented broad continuous bands in visible region.
