Efficient adsorption of ammonia by incorporation of metal ionic liquids into silica gels as mesoporous composites
Efficient adsorption of ammonia by incorporation of metal ionic liquids into silica gels as mesoporous composites
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通过将金属离子液体掺入作为介孔复合材料的硅胶来有效吸附氨
DOI：
10.1016/j.cej.2019.03.180
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发表时间：
2019-08
影响因子：
15.1
通讯作者：
Zhang Xiangping
中科院分区：
文献类型：
--
作者：
Zeng Shaojuan;Wang Junli;Li Pengfei;Dong Haifeng;Wang Hui;Zhang Xiaochun;Zhang Xiangping
离子液体（Ion Liquids，ILs）具有挥发性小、与NH3的亲和性好、结构可设计等优点，为高效分离NH3并同时回收NH3提供了一条新的途径。然而，离子液体相对较高的粘度和有限的气液界面严重影响气体在离子液体中的扩散，这阻碍了其在工业上的实际应用。为了克服离子液体在气体分离中的传质局限性，将3种对NH3具有良好亲和性的金属离子液体[Bmim]2[CuCl 4]、[Bmim]2[NiCl 4]和[Bmim]2[Co（NCS）4]通过包埋-蒸发法分别引入到具有大比表面积和丰富羟基的多孔硅胶中，制备了新型的MIL@硅胶复合材料，高效可逆吸附NH3。FT-IR和BET结果表明，不同负载量的MIL制备的吸附剂均为介孔复合材料。[Bmim]2[Co（NCS）4]@硅胶复合材料不仅表现出比纯硅胶更高的NH3容量和NH3选择性，比相应的纯MIL更快的吸附速率，而且表现出优异的可逆性。当[Bmim]2[Co（NCS）4]负载量为48.89wt%时，MIL@silica gel复合材料在15 min内对NH3的吸附量最大，达到99.808 mg NH3·（g adsorber）− 1，这可能是由于钴配位阴离子与NH3之间的络合作用和氢键作用以及介孔结构的协同作用.此外，[Bmim]2[Co（SCN）4]@硅胶吸附的NH3可在15 min内完全释放，且在5次吸附和再生循环中NH3容量均无明显损失，显示出作为NH3分离吸附剂的巨大应用潜力。
The emerging of ionic liquids (ILs) provides a promising way to efficiently separate ammonia (NH3) and simultaneously recover NH3due to their negligible volatility, good affinity with NH3and designable structures. However, the relatively high viscosities of ILs and the limited gas-liquid interface severely affect gas diffusion in ILs, which hinders their practical use in industries. In this work, in order to overcome the mass-transfer limitations of ILs in gas separation, three metal ILs (MILs), [Bmim]2[CuCl4], [Bmim]2[NiCl4] and [Bmim]2[Co(NCS)4], with good affinity toward NH3were incorporated into porous silica gels with large surface area and abundant hydroxyl groups, by an impregnation-vaporization method to form novel MIL@silica gel composites for rapid, efficient and reversible adsorption of NH3. The FT-IR and BET results indicated that the prepared adsorbents with different loadings of MILs are mesoporous composites. The [Bmim]2[Co(NCS)4]@silica gel composites not only show much higher NH3capacity and NH3selectivity than pristine silica gel and faster adsorption rate than the corresponding pure MILs, but also exhibit excellent reversibility. The highest capacity of NH3adsorption up to 99.808 mg NH3·(g adsorbent)−1in 15 min was obtained when the loading of [Bmim]2[Co(NCS)4] in the MIL@silica gel composite was 48.89 wt%, which could be attributed to the synergistic interaction of the complexation and hydrogen bonding between cobalt coordinated anion and NH3as well as mesoporous structures. Moreover, the NH3absorbed by the [Bmim]2[Co(SCN)4]@silica gel can be completely released in 15 min, and no obvious losses in NH3capacity were detected during five adsorption and regeneration cycles, indicating great potentials as adsorbents for NH3separation applications.
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影响因子：
5.3
作者：
Ying Zhao;Jian-ying Wang;Haichao Jiang;Yong-qi Hu
通讯作者：
Ying Zhao;Jian-ying Wang;Haichao Jiang;Yong-qi Hu
具有不同阴离子和阳离子取代基的咪唑基质子离子液体增强 NH3 捕获
DOI：
10.1002/jctb.5467
发表时间：
2017
期刊：
Chem. Technol. Biot.
影响因子：
--
作者：
Dawei Shang;Lu Bai;Shaojuan Zeng;Haifeng Dong;Hongshuai Gao;Xiangping Zhang;Suojiang Zhang
通讯作者：
Suojiang Zhang
影响因子：
15.1
作者：
I. Arellano;P. Pendleton
通讯作者：
I. Arellano;P. Pendleton
影响因子：
--
作者：
Weijia Huang;Guangming Sun;D. Zheng;L. Dong;Xianghong Wu;Juan Chen
通讯作者：
Weijia Huang;Guangming Sun;D. Zheng;L. Dong;Xianghong Wu;Juan Chen
影响因子：
4.2
作者：
A. Yokozeki;M. Shiflett
通讯作者：
A. Yokozeki;M. Shiflett