Recovery of Au(III) from leach solutions using thiourea functionalized zeolitic imidazolate frameworks (TU*ZIF-8)
| Autor: | Zhike Wang, Cunling Ye, Lingyun Chen, Boshuang Zhang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Aqueous solution
Metal ions in aqueous solution Metals and Alloys 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences chemistry.chemical_compound Adsorption Thiourea chemistry Materials Chemistry Metal-organic framework 0210 nano-technology Selectivity Electrostatic interaction Zeolitic imidazolate framework Nuclear chemistry |
| Zdroj: | Hydrometallurgy. 180:262-270 |
| ISSN: | 0304-386X |
| DOI: | 10.1016/j.hydromet.2018.08.002 |
| Popis: | Metal organic frameworks (MOFs) have diverse applications in adsorption/separation fields. However, little is known about MOFs as adsorbents for the adsorption of Au(III) from aqueous solutions. In this work, a highly porous MOFs, ZIF-8, was modified by thiourea (TU) via coordination-based post-synthetic modification strategy. Compared with pristine ZIF-8, the TU functionalized ZIF-8, TU*ZIF-8, exhibited a remarkable Au(III) adsorption ability with a saturation adsorption capacity of 4262.8 mg/g although its surface area and pore volume decreased with TU loading. Interestingly, the adsorption efficiency of Au(III) was >99% with a broad Au(III) concentration range of 50–400 mg/L using only 20 mg TU*ZIF-8. Meanwhile, TU*ZIF-8 showed an encouraging selectivity for Au(III) in the presence of some metal ions such as Cu(II), Cr(VI), Pb(II), Cd(II), Mn(II), Mg(II), and Co(II). The improved adsorption of Au(III) on TU*ZIF-8 is explained by the synergistic effect of electrostatic interaction and coordination interaction. Particularly, the coordination interaction between Au(III) and TU of TU*ZIF-8 plays a major role in the Au(III) adsorption process of TU*ZIF-8. This work suggests a potential application of functionalized MOFs for the efficient recovery of gold from aqueous solutions. |
| Databáze: | OpenAIRE |
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