期刊
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
卷 80, 期 -, 页码 342-348出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jtice.2017.07.020
关键词
Nanotechnology; Adsorption; Gold; Selectivity
资金
- National Natural Science Foundation [51464024, 51664037]
A new adsorbent was synthesized via functionalizing nano-silica with poly(methacryloxyethyltrimethyl ammonium chloride) (PDMC) for selective recovery of Au(III) from aqueous solutions. The adsorbent was characterized by FT-IR, TGA, XPS and TEM. A batch adsorption experiment was conducted to evaluate the adsorption capacity, reusability and selectivity. The maximum adsorption capacity of Au(III) was 127.3 mg/g at room temperature and the optimum pH 3.0. The adsorption equilibrium was achieved within 20 min. The adsorption process followed preferably the pseudo-second order kinetics and the Langmuir isotherm model. Ion exchange between gold ions and amines/chlorine groups played an important role in the adsorption process. The adsorption desorption cycles indicated that the adsorbent had a stable adsorption performance and retained high adsorption efficiency. Moreover, the adsorbent can selectively adsorb Au(III) from coexisting ions in aqueous solution. Therefore, nano-silica modified with PDMC could be of great potential in recovering Au(III) from industrial effluents and waste e-products. (C) 2017 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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