期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 277, 期 -, 页码 149-153出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2018.10.027
关键词
ZIF-8; Mesopores and micropores; External surface; External and internal adsorption
类别
资金
- Ministry of Science and Technology of the Republic of China [106-2221-E-008-082]
Two kinds of ZIF-8 crystals have been prepared from the ultrasound-assisted hydrothermal reaction of a stoichiometric metal-ligand precursor solution. The addition of surfactant promoted the formation of nanocrystals having a much larger external surface area compared to the non-promoted one. The two samples were then employed to examine the effects of particle size on dye adsorption. The adsorption capacity of Rhodamine B (RB) and methyl orange (MO) was found directly proportional to the external surface area of the ZIF-8 particles, while that of methylene blue (MB) did not vanish with decreasing external area. The residue adsorption is the most clear-cut evidence confirming the penetration of the MB molecule into the ZIF-8 framework, but not the similarly sized MO molecule. The larger RB molecule was also excluded from the internal pores and cover only the external surface of the crystals. Our calculations suggested that each RB and MO molecule occupied 4.7 and 7.9 nm(2) of the external surface, respectively. In contrast, MB adsorption occurs both inside the ZIF-8 structure, at a loading of 0.11 molecule per unit cell, and on the external surface with 2.3 nm(2)/molecule.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据