Hydrothermal in situ synthesis of high-crystallinity layered double hydroxide on electrospun polyacrylonitrile non-woven membrane: Application as anion capture filter
Hydrothermal in situ synthesis of high-crystallinity layered double hydroxide on electrospun polyacrylonitrile non-woven membrane: Application as anion capture filter
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DOI：
10.1016/j.clay.2022.106639
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发表时间：
2022-10
影响因子：
5.6
通讯作者：
K. Tamura;Yuying Wu;C. Kato;M. Kamon;N. Iyi;Yujiro Watanabe
中科院分区：
文献类型：
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作者：
K. Tamura;Yuying Wu;C. Kato;M. Kamon;N. Iyi;Yujiro Watanabe
在聚丙烯腈（PAN）纳米纤维存在下生长层状双氢氧化物（LDH）晶体，开发出具有高阴离子吸附性能的三维结构混合过滤器。通过静电纺丝制造的 PAN 纳米纤维的拉伸强度和耐化学性在 250°C 60 分钟的热处理后得到改善。 LDH 在 PAN 上的生长是通过使用尿素或六亚甲基四胺 (HMT) 进行水解来进行的，并研究了这种“原位合成”的最佳条件。结果，利用 HMT 在 140°C 水热处理 24 小时，获得了横向尺寸约为 20 μm 的 LDH 板状晶体。晶体垂直于 PAN 纤维表面密集生长。将纤维织物上生长的LDH转化为夹层中含有Cl-的LDH后，将所得织物设置在过滤器支架中并进行磷酸吸附试验。结果表明，原位水热合成制备的混合过滤器具有良好的磷酸盐吸附特性，能够从含有竞争性硫酸根离子的水中选择性地吸附少量磷酸根离子。
Layered double hydroxide (LDH) crystals were grown in the presence of polyacrylonitrile (PAN) nanofibers to develop a three-dimensionally-structured hybrid filter with high anion adsorption performance. The tensile strength and chemical resistance of the PAN nanofibers manufactured by electrospinning were improved upon heat treatment at 250 °C for 60 min. The growth of LDH on PAN was conducted by hydrolysis using urea or hexamethylenetetramine (HMT), and optimum conditions for this “in situsynthesis” were investigated. As a result, LDH plate-like crystals with a lateral size of ~20 μm were obtained by hydrothermal treatment at 140 °C for 24 h using HMT. The crystals grew densely perpendicular to the surface of the PAN fibers. After converting the LDH grown on the fiber fabric to LDH contain Cl−in the interlayer, the resulting fabric was set in a filter holder and a phosphoric acid adsorption test was conducted. The results showed that the hybrid filter prepared by thisin situhydrothermal synthesis had good phosphate adsorption characteristics, and that small amounts of phosphate ions were adsorbed selectively from water containing competing sulfate ions.