Functionalized hectorite clay mineral for Ag(I) ions extraction from wastewater and preparation of silver nanoparticles supported clay

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• 作者：Theeradit Phothitontimongkol ; Kittipong Sanuwong ; Nina Siebers ; Nipaka Sukpirom ; Fuangfa Unob
• 关键词：Hectorite ; Functionalized clay ; Silver nanoparticles ; Silver ions ; Extraction
• 刊名：Applied Clay Science
• 出版年：2013
• 出版时间：August, 2013
• 年：2013
• 卷：80-81
• 期：Complete
• 页码：346-350
• 全文大小：575 K

文摘

A novel clay mineral-based adsorbent for Ag(I) ions extraction was obtained by modifying hectorite with 2-(3-(2-aminoethylthio)propylthio)ethanamine (AEPE-hectorite). The modified hectorite was used to recover Ag(I) ions from wastewater for further preparation of silver nanoparticles supported hectorite. The parameters affecting silver ions extraction by AEPE-hectorite were investigated. The adsorbent could extract Ag(I) ions from solution in a wide pH range (1-8) and high extraction efficiencies were achieved in the solution pH ranged from 4 to 9. AEPE-hectorite showed a good selectivity toward Ag(I) ions over Co(II), Ni(II) and Cd(II) ions and the solution ionic strength had no significant effect on extraction efficiency. The adsorption of Ag(I) ions onto AEPE-hectorite followed the Freundlich isotherm model with maximum adsorption capacity observed in the experiment of 49.5 mg g^? 1. The adsorbent was successfully used to recover silver ions from a wastewater containing high concentration of silver and silver nanoparticles supported hectorite was obtained after reducing with NaBH₄. These results show an alternative in the preparation of silver nanoparticles supported clay.