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- W3048852968 abstract "Abstract In this paper, hierarchical porous ultrafine alumina fibers (HPAFs) with macropore and mesopore are facial constructed via using the simple PTFE emulsion template and electro-blown spinning process. The effect of different calcination temperatures, 500 °C, 800 °C and 1100 °C on the pore structures of the ultrafine alumina fibers and their dye adsorption performances are systemically investigated. Results show that calcination temperature has a significant effect on the fiber morphology and pore structure, which is of vital importance in adsorption performance of the ultrafine alumina fiber. Thereinto, the HPAF obtained at 800 °C (HPAF-800) exhibits obviously hierarchical porous structure and high specific surface area (226.94 m2 g−1), which attributed to the thermal decomposition of PTFE particles and the surfactants or other dispersants in PTFE emulsion. Further investigation indicates that the HPAF-800 has good dye adsorption performance, especially the high dye adsorption rate towards methylene blue (MB) with the dye removal rate reaches 97.65% within 30 min at 25 °C, which is mainly due to its hierarchical porous structure. The HPAF-800 also shows desired adsorption cycle performance and the ability to regenerate easily. The adsorption kinetics research indicates that the MB adsorption process follows the pseudo-second-order kinetic model very well. The mechanism of the HPAF-800 for dye adsorption is also concerned. Compared with common alumina fibers, the HPAF-800 exhibits special adsorption behavior and enhanced dye removal rate, which originate from its surface macropores and the capillary effect induced by inner mesopores. Finally, the HPAF-800 suggests its potential applications in adsorption as well as related areas, such as catalysis and catalyst supports." @default.
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- W3048852968 date "2020-12-01" @default.
- W3048852968 modified "2023-10-17" @default.
- W3048852968 title "Facile construction of hierarchical porous ultrafine alumina fibers (HPAFs) and its application for dye adsorption" @default.
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- W3048852968 doi "https://doi.org/10.1016/j.micromeso.2020.110544" @default.
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