Surfactant-assisted synthesis of nanocrystalline zeolitic imidazolate framework 8 and 67 for adsorptive removal of perfluorooctane sulfonate from aqueous solution
Surfactant-assisted synthesis of nanocrystalline zeolitic imidazolate framework 8 and 67 for adsorptive removal of perfluorooctane sulfonate from aqueous solution
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DOI：
10.1016/j.cattod.2019.12.036
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发表时间：
2020-08
期刊：
影响因子：
5.3
通讯作者：
Hiroki Konno;Y. Nakasaka;K. Yasuda;Miho Omata;T. Masuda
中科院分区：
文献类型：
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作者：
Hiroki Konno;Y. Nakasaka;K. Yasuda;Miho Omata;T. Masuda
纳米晶沸石咪唑酯骨架8和67（ZIF-8和ZIF-67）是在室温下在水溶液中通过表面活性剂辅助合成制备的。没有表面活性剂的合成产生的 ZIF-8 和 ZIF-67 的晶体尺寸分别为 1.19 和 2.95 μm。然而，通过表面活性剂辅助合成获得的它们的晶体尺寸分别为81和150 nm。无论晶体尺寸如何，Brunauer-Emmett-Teller (BET) 表面积和微孔体积几乎保持恒定。 TGA分析证实ZIF-8和ZIF-67具有足够的水处理耐热性。可以获得不同晶体尺寸的高结晶ZIF-8和ZIF-67，这些ZIF晶体被用作吸附剂从水溶液中吸附去除全氟辛烷磺酸（PFOS）。 ZIF-67 吸附的 PFOS 量 (734.7 mg-PFOS/g-ZIF-67) 远高于沸石、活性炭和 ZIF-8 吸附的量。此外，晶体尺寸缩小可有效提高吸附速率，纳米晶ZIF-67比粗晶ZIF-67更快达到吸附平衡。这一特性使纳米晶 ZIF-67 成为去除水溶液中 PFOS 的最有效和最有前途的吸附剂之一。
Nanocrystalline zeolitic imidazolate frameworks 8 and 67 (ZIF-8 and ZIF-67) were prepared via surfactant-assisted synthesis in aqueous solution at room temperature. The synthesis without surfactant yielded crystal sizes for ZIF-8 and ZIF-67 of 1.19 and 2.95 μm, respectively. However, their crystal sizes obtained via surfactant-assisted synthesis were 81 and 150 nm, respectively. The Brunauer–Emmett–Teller (BET) surface area and micropore volume remained almost constant regardless of the crystal size. TGA analysis confirmed that ZIF-8 and ZIF-67 have sufficient thermal resistance for water treatment. Highly crystalline ZIF-8 and ZIF-67 with different crystal sizes could be obtained, and these ZIF crystals were used as adsorbents for adsorptive removal of perfluorooctane sulfonate (PFOS) from aqueous solution. The amount of PFOS adsorbed by ZIF-67 (734.7 mg-PFOS/g-ZIF-67) was considerably higher than that absorbed by zeolite, activated carbon, and ZIF-8. Additionally, the crystal downsizing was effective in improving the adsorption rate, and adsorption equilibrium was reached faster by nanocrystalline ZIF-67 than by macrocrystalline ZIF-67. This feature makes nanocrystalline ZIF-67 one of the most effective and promising adsorbents for removing PFOS from aqueous solution.