Ag-loaded thermo-sensitive composite microgels for enhanced catalytic reduction of methylene blue

Abstract

In this work, we report the synthesis of composite system pNAC, composed of silver nanoparticles embedded in pure thermo-sensitive crosslinked polymer network of poly(N-isopropylacrylamide-co-acrylamide) (pNA), using as a catalyst for the reduction of methylene blue (MB) dye by sodium borohydride (NaBH 4 ). The pNA was prepared by conventional free radical polymerization technique using sodium dodecyl sulfate as stabilizing agent, followed by in situ reduction of AgNO 3 inside the polymer network by NaBH 4 for the synthesis of composite systems pNACs. The synthesized pNA and pNACs were characterized by FTIR, dynamic light scattering, thermogravimetric analysis, scanning electron microscopy and UV-visible spectroscopy techniques. The materials were found sensitive toward temperature change of the medium. The entrapment ability of pNA toward different amounts of AgNO 3 solution was studied, and effect of metal content on particle size of pNACs was analyzed. The pNACs were applied as a catalyst for the reduction of MB in which they exhibit high catalytic activity and reusability toward the reaction.

One-step synthesized 3D-structured MOF foam for efficient and convenient catalytic reduction of nitrogen-containing aromatic compounds

“…9 (b). The corresponding pseudo-first order rate constant was 1.67 min -1 , which was significantly higher than many reported values of MB hydrogenation [69][70][71][72][73][74] (Table 3), indicating its superior catalytic activities for aqueous hydrogenation of MB.…”

Fundamentals and applications of acrylamide based microgels and their hybrids: a review

“…The similar observations of variation in size of P(NIPAM-Am) microgel particles with change in temperature has been reported by other researchers. 5,57,58 The polymerization of NIPAM, Am with an additional ionic monomer does not only increase the hydrophilicity in resulting microgels but also gives them multi-responsive behavior. Farooqi et al investigated the variation in size of P(NIPAM-Am-AA) and P(NIPAM-Am-PBA) microgels with change in temperature, pH and ionic strength of medium and noted that both microgel systems shows variation in their size with aforementioned stimuli.…”

Preparation and characterization of magnetic zirconium oxide nanocomposite as a catalyst for reduction of methylene blue

“…Our literature survey show, that most researchers used the typical Langmuir-Hinshelwood model for the reduction of MB in the presence of reductants at nanocatalysts surface [30,31]. In the present work, this mechanism can be applied and schematically illustrated in Scheme 1.…”