A facile strategy without organic template was developed for the conversion of fly ash to LTA-type zeolite(LTA-Z),which could be used as a good adsorbent for the removal of acid fuchsin(AF).XRD results indicated that ...A facile strategy without organic template was developed for the conversion of fly ash to LTA-type zeolite(LTA-Z),which could be used as a good adsorbent for the removal of acid fuchsin(AF).XRD results indicated that the pure crystalline product was obtained with the structure of LTA-type zeolite.SEM investigations showed that the well-defined LTA-Z crystals exhibited uniform size with the same cubic shape.The maximum AF adsorption amount was observed at pH=5,slightly lower than pHPZC of LTA-Z.Higher temperature favored AF adsorption onto LTA-Z and it was an endothermic process.Furthermore,AF adsorption amount increased with initial AF concentration increasing and LTA-Z dosage decreasing.Surface sorption governed this process at the initial 120 min period,followed by the internal diffusion of AF molecules between porous sites.The Langmuir model was determined as the adsorption isothermal,suggesting that the monolayer coverage of AF on LTA-Z surface was involved.展开更多
Presently activated carbon is used as an adsorptive material for chemical and biological warfare agents. It possess excellent surface properties such as large surface area, fire-resistance and plenty availability, but...Presently activated carbon is used as an adsorptive material for chemical and biological warfare agents. It possess excellent surface properties such as large surface area, fire-resistance and plenty availability, but has disadvantages such as its heavy weight, low breathability (after adsorption of moisture) and disposal. In this paper, we propose to utilize novel electrospun polymeric nanostructures having zeolites as catalyst materials. In this respective, the electrospun polymer nanofibers would serve as the best possible substitutes to activated carbon based protective clothing applications. This is the first in the literature that reports the integration of these types of catalysts with nanofiberous membranes. Electrospinning of cellulose/polyethylene terephthalate (PET) blend nanofibers has been carried out. Zeolite catalysts (Linde Type A and Mordenite) for the detoxification of nerve agent stimulant-paraoxon, were prepared due to their relative simplicity of synthesis. The catalysts were then coated onto nanofiber membranes and their morphology was confirmed using SEM. This is the first report on the coating of nanofibers with zeolites and their successful demonstration against nerve agent stimulant. The UV absorption spectra clearly show the detoxification ability of the functionalized fibers and their potential to be used in textiles for protection and decontamination.展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 51002040)New Century Excellent Talents in Heilongjiang Provincial Universities (Grant No. 1253-NCET-010)+2 种基金Natural Science Youth Fund of Heilongjiang Province (Grant No. QC2012C084)Science Foundation of the Heilongjiang Education Office (Grant No. 12521071)Young Outstanding Talents Project of Harbin University of Science and Technology
文摘A facile strategy without organic template was developed for the conversion of fly ash to LTA-type zeolite(LTA-Z),which could be used as a good adsorbent for the removal of acid fuchsin(AF).XRD results indicated that the pure crystalline product was obtained with the structure of LTA-type zeolite.SEM investigations showed that the well-defined LTA-Z crystals exhibited uniform size with the same cubic shape.The maximum AF adsorption amount was observed at pH=5,slightly lower than pHPZC of LTA-Z.Higher temperature favored AF adsorption onto LTA-Z and it was an endothermic process.Furthermore,AF adsorption amount increased with initial AF concentration increasing and LTA-Z dosage decreasing.Surface sorption governed this process at the initial 120 min period,followed by the internal diffusion of AF molecules between porous sites.The Langmuir model was determined as the adsorption isothermal,suggesting that the monolayer coverage of AF on LTA-Z surface was involved.
文摘Presently activated carbon is used as an adsorptive material for chemical and biological warfare agents. It possess excellent surface properties such as large surface area, fire-resistance and plenty availability, but has disadvantages such as its heavy weight, low breathability (after adsorption of moisture) and disposal. In this paper, we propose to utilize novel electrospun polymeric nanostructures having zeolites as catalyst materials. In this respective, the electrospun polymer nanofibers would serve as the best possible substitutes to activated carbon based protective clothing applications. This is the first in the literature that reports the integration of these types of catalysts with nanofiberous membranes. Electrospinning of cellulose/polyethylene terephthalate (PET) blend nanofibers has been carried out. Zeolite catalysts (Linde Type A and Mordenite) for the detoxification of nerve agent stimulant-paraoxon, were prepared due to their relative simplicity of synthesis. The catalysts were then coated onto nanofiber membranes and their morphology was confirmed using SEM. This is the first report on the coating of nanofibers with zeolites and their successful demonstration against nerve agent stimulant. The UV absorption spectra clearly show the detoxification ability of the functionalized fibers and their potential to be used in textiles for protection and decontamination.
