期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 8, 期 7, 页码 3013-3025出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c00032
关键词
Nanoparticle synthesis; Aqueous two-phase system; Green process; Interfacial adsorption; Simultaneous synthesis; Separation process
资金
- DST FIST grant
Large scale synthesis of nanoparticles requires their simultaneous synthesis and separation. In this work, we establish a framework for simultaneous synthesis and separation of nanoparticles based on an environmentally benign aqueous two-phase system (ATPS) and illustrate the proof of concept in the synthesis of silver nanoparticles. For this, the ATPS was prepared using polyethylene glycol and trisodium citrate dihydrate. These components act as reducing agents and can be used for nanoparticle synthesis at ambient temperature (similar to 30 degrees C). The concentration of the reducing agents in the ATPS is maintained relatively high to ensure the formation of two phases. Nanoparticle synthesis at these high concentrations is achieved using sodium hydroxide as a catalyst. The proclivity of the nanoparticles to adsorb at the liquid-liquid interface is explored and exploited to separate them as they are synthesized. The novel green synthesis and separation technique proposed here is shown to have a significant potential for synthesis of nanoparticles on a large scale. The unspent reagents in the reaction can be effectively recycled and reused.
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