Template-free and room temperature synthesis of hierarchical porous zeolitic imidazolate framework nanoparticles and their dye and CO2 sorption,Green Chemistry

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Template-free and room temperature synthesis of hierarchical porous zeolitic imidazolate framework nanoparticles and their dye and CO2 sorption
Green Chemistry ( IF 9.3 ) Pub Date : 2018-02-12 00:00:00 , DOI: 10.1039/c7gc03805d
Hani Nasser Abdelhamid _{1,

2,

3,

4,

5} , Xiaodong Zou _{1,

2,

3,

4,

5}

Affiliation

Hierarchical porous zeolitic imidazolate framework ZIF-8 nanoparticles have been synthesized using zinc nitrate, 2-methylimidazole (Hmim), and sodium hydroxide. Zinc hydroxide nitrate nanosheets were formed as intermediates that further transformed to hierarchical porous ZIF-8 after the addition of Hmim. These intermediates serve as in situ sacrificial templates and promote the formation of hierarchical porous ZIF-8 without the need for any other templates. The surface area and mesoporosity of the materials can be tuned by adjusting the concentration of NaOH. This method offers a fast and template-free approach for the synthesis of pure hierarchical porous ZIF-8 at room temperature with tunable porosity. The approach has been applied to synthesize two-dimensional ZIF leaf-like materials, ZIF-L. The synthesis of ZIF-8 and ZIF-L can be scaled up with high yields (>80%). The resulting ZIF-8 and ZIF-L materials show very good CO₂ sorption properties. ZIF-8 nanoparticles show fast (<5 min), selective, and high efficiency (>95%) uptake of methyl blue in aqueous solution both without and in the presence of other dyes. The results open a new avenue for the understanding of the self-assembly and the formation of hierarchical porous ZIFs.

中文翻译：

无模板和室温合成的分层多孔咪唑酸酯骨架纳米粒子及其对染料和CO _2的吸附

已使用硝酸锌，2-甲基咪唑（Hmim）和氢氧化钠合成了分层的多孔沸石咪唑酸盐骨架ZIF-8纳米粒子。形成氢氧化锌硝酸盐纳米片作为中间体，在加入Hmim后可进一步转化为分级多孔ZIF-8。这些中间体可就地使用牺牲模板，并促进了分层多孔ZIF-8的形成，而无需任何其他模板。可以通过调节NaOH的浓度来调节材料的表面积和介孔率。该方法提供了一种快速且无模板的方法，用于在室温下以可调的孔隙度合成纯分层多孔ZIF-8。该方法已应用于合成二维ZIF叶状材料ZIF-L。ZIF-8和ZIF-L的合成可以高产率（> 80％）按比例放大。所得的ZIF-8和ZIF-L材料显示出非常好的CO ₂吸附性能。无论是否存在其他染料，ZIF-8纳米粒子在水溶液中均显示快速（<5分钟），选择性和高效（> 95％）的甲基蓝吸收。结果为了解自组装和分层多孔ZIF的形成开辟了一条新途径。

更新日期：2018-03-06

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