Ultrafast synthesis of 3D porous flash graphene and its adsorption properties
Ultrafast synthesis of 3D porous flash graphene and its adsorption properties
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DOI：
10.1016/j.colsurfa.2023.132178
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发表时间：
2023-08-11
影响因子：
5.2
通讯作者：
Zhu, Haiyang
中科院分区：
文献类型：
--
作者：
Liao, Yuntian;Zhu, Rongtao;Zhu, Haiyang
3D分级多孔石墨烯（3D HPG）由于其独特的孔隙率、优异的电子传输能力和多功能性而最近引起了人们的极大关注。然而，由于传统的制备方法费时、耗能、污染严重，严重阻碍了其广泛应用。本研究利用闪焦耳加热（FJH）的能力在21 s内从烟煤（BC）超快合成具有良好分散和吸附性能的3D多孔闪石墨烯（3D PFG）。碳酸盐热解产生的热冲击和焦耳加热产生的热膨胀被用来产生稳定的多孔结构。3D PFG的比表面积高达504 m2 g·cm-1，呈现微孔、中孔和大孔的多级孔结构特征。研究了不同碳酸盐配比和不同闪光电压下FJH法合成三维PFG的孔结构变化，得到了FJH过程中多级孔结构的可控合成条件。实验和模拟结果表明，三维PFG具有良好的分散性，对亚甲基蓝和甲基橙子具有良好的吸附性能。该工艺不仅简化了三维HPG的制备工艺，而且为煤的高附加值利用提供了一条有价值的途径。
3D hierarchical porous graphene (3D HPG) has recently captured significant attention due to its unique porosities, excellent electron transport capability, and multifunctionality. However, given that the traditional preparation method of 3D HPG is time-consuming, energy-consuming and seriously polluting, which seriously block its wide application. This study leveraged the capabilities of flash Joule heating (FJH) to ultrafast synthesize 3D porous flash graphene (3D PFG) with good dispersion and adsorption properties from bituminous coal (BC) within 21 s. The thermal shock generated by carbonate pyrolysis and the thermal expansion generated by Joule heating were used to produce the stable porous structure. Moreover, the specific surface area of 3D PFG was as high as 504 m2g 1, and displayed the characteristics of hierarchical porous structure of micropores, mesopores and macropores. The porous structure changes of 3D PFG synthesized by FJH under different carbonate ratios and different flash voltages were investigated, and the controllable synthesis conditions of hierarchical pore structures during FJH were obtained accordingly. As the experimental and simulation results show, the 3D PFG displays good dispersibility and good adsorption performance as adsorbent for methylene blue and methyl orange. This environmentally friendly synthetic process of FJH not only simplifies the preparation process of 3D HPG but also provides a valuable way for the high value-added utilization of coal.