Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University , Daegu 41566, Republic of Korea.
Department of Energy Systems Engineering, DGIST , Daegu 42988, Republic of Korea.
ACS Appl Mater Interfaces. 2017 Mar 22;9(11):10276-10285. doi: 10.1021/acsami.7b00859. Epub 2017 Mar 8.
Porous carbons were prepared from a metal-organic framework (MOF, named ZIF-8), with or without modification, via high-temperature pyrolysis. Porous carbons with high nitrogen content were obtained from the calcination of MOF after introducing an ionic liquid (IL) (IL@MOF) via the ship-in-bottle method. The MOF-derived carbons (MDCs) and IL@MOF-derived carbons (IMDCs) were characterized using various techniques and used for liquid-phase adsorptions in both water and hydrocarbon to understand the possible applications in purification of water and fuel, respectively. Adsorptive performances for the removal of organic contaminants, atrazine (ATZ), diuron, and diclofenac, were remarkably enhanced with the modification/conversion of MOFs to MDC and IMDC. For example, in the case of ATZ adsorption, the maximum adsorption capacity of IMDC (Q = 208 m/g) was much higher than that of activated carbon (AC, Q = 60 m/g) and MDC (Q = 168 m/g) and was found to be the highest among the reported results so far. The results of adsorptive denitrogenation and desulfurization of fuel were similar to that of water purification. The IMDCs are very useful in the adsorptions since these new carbons showed remarkable performances in both the aqueous and nonaqueous phases. These results are very meaningful because hydrophobic and hydrophilic adsorbents are usually required for the adsorptions in the water and fuel phases, respectively. Moreover, a plausible mechanism, H-bonding, was also suggested to explain the remarkable performance of the IMDCs in the adsorptions. Therefore, the IMDCs derived from IL@MOF might have various applications, especially in adsorptions, based on high porosity, mesoporosity, doped nitrogen, and functional groups.
介孔碳由金属有机骨架（MOF，命名为 ZIF-8）通过高温热解制备，或者在不进行修饰的情况下直接进行高温热解，或者在引入离子液体（IL）（IL@MOF）后通过“ship-in-bottle”方法进行修饰，然后通过高温热解得到。MOF 衍生碳（MDC）和 IL@MOF 衍生碳（IMDC）通过各种技术进行了表征，并用于水相和烃相中的液相吸附，以分别了解在水和燃料净化方面的潜在应用。对有机污染物莠去津（ATZ）、西玛津、和双氯芬酸的去除吸附性能在 MOF 向 MDC 和 IMDC 的修饰/转化后得到了显著提高。例如，在 ATZ 吸附的情况下，IMDC（Q=208 m/g）的最大吸附容量远高于活性炭（AC，Q=60 m/g）和 MDC（Q=168 m/g），并且是迄今为止报道的结果中最高的。燃料的吸附脱氮和脱硫的结果与水净化的结果相似。在吸附中，IMDC 非常有用，因为这些新的碳在水相和非水相中的吸附中都表现出了显著的性能。这些结果非常有意义，因为通常需要疏水性和亲水性吸附剂分别用于水相和燃料相的吸附。此外，还提出了氢键作用的可能机制来解释 IMDC 在吸附中的优异性能。因此，基于高孔隙率、中孔性、掺杂氮和官能团，IL@MOF 衍生的 IMDC 可能具有各种应用，特别是在吸附方面。
