In this work, the microwave synthesis of Nylon-6 hybrid polymeric nanocomposite (HPNC) was studied by the polymerization of ε-caprolactam, 6-aminocaproic acid, and 2% wt of silver nanoparticles (Ag-NPs). It was determined that the dielectric heating (DH) of the Ag-NPs controls the thermal behavior of the HPNCs synthesis and triggers the chemical reaction between Ag-NPs and the Nylon-6 molecules. Such reaction promotes their coating with the polymer and their precipitation, which affects the agitation of the reaction mixture, and results in broader molecular weight distribution and three HPNC populations. Usually, the power output effect in these processes is thermal as it accelerates their heating rate. Still, for HPNCs, higher output reduces the agglomerate size of the Ag-NPs and accelerates their precipitation. At power up to 600 W, the DH of the Ag-NPs causes the explosion of the reaction vials.The antimicrobial activity of the HPNCs against P. aeruginosa is almost 100% effective at 180 min of exposure; therefore, this microwave synthesis process is suitable for producing antimicrobial HPNCs.
This paper presents the results concerning the first use of activated composite membranes (ACMs) for the facilitated transport of silver ions containing di-(2-ethylhexyl)-dithiophosphoric acid (DTPA) as the carrier. DTPA was immobilized by interfacial polymerization in a dense layer that was deposited in a porous layer, which was prepared on a nonwoven fabric support by phase inversion. The influence of fundamental parameters affecting the transport of silver ion as the carrier concentration in the membrane phase and stripping agent variation of the stripping solution have been studied. In the optimal conditions, the amount of silver transported across the ACMs was greater than 50%, whereas if the content of the carrier is modified, more than the 90% of the initial silver is removed from the feed phase.
La plata es un metal precioso de gran valor económico y tecnológico debido a la variedad de usos y aplicaciones que tiene en la industria. Adicionalmente, su recuperación de aguas residuales tiene importancia ambiental a causa de las estrictas regulaciones que existen hoy en día, por lo que el desarrollo y la mejora continua de métodos de recuperación de plata son de amplio interés a nivel mundial. De acuerdo con lo expresado anteriormente, en este documento se hace una breve descripción de las estrategias que se han utilizado tradicionalmente para la obtención de este metal, hasta las técnicas más recientes para su extracción y recuperación. Se discuten procesos como la cianuración, el uso de la electrólisis y más ampliamente, la implementación de la tecnología de membranas.
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