关键词: 电化学, 合成, 金属有机骨架材料, 巯基, 修饰, 吸附剂, Hg²⁺

Abstract:

In order to adsorb Hg²⁺ in waste water efficiently and quickly, copper-based metal organic frameworks (Cu-MOFs) were prepared using electrochemical method and modified by ethanedithiol to deposit sulfhydryl on it. The SH-Cu-BDC materials obtained were used for adsorbing Hg²⁺ in waste water. The samples modified before and after were characterized with EDS, IR, N₂ adsorption, SEM. The results show that: -SH groups have been connected to the surface of Cu-BDC materials; the modified SH-Cu-BDC materials have micro-porous structure and large specific surface area as well as unique flower structure and evenly distribute antenna shape matter. 10 mg SH-Cu-BDC can absorb about 20 ml Hg²⁺ solution (300 mg·L^-1) at pH=5. The adsorption reaches saturation after 60 min and the maximum capacity (saturated adsorption capacity) is about 585 mg·g^-1. The adsorption of Hg²⁺ on SH-Cu-BDC is monolayer and follows quasi-second-order kinetics and Langmuir adsorption isotherm. Regeneration experiment shows that SH-Cu-BDC may reuse.

Key words: electrochemistry, synthesis, MOFs, -SH, modification, adsorbent, Hg²⁺