Engineering the metathesis and oxidation-reduction reaction in solid state at room temperature for nanosynthesis

Abstract

It is a long-standing goal to explore convenient synthesis methodology for functional materials. Recently, several multiple-step approaches have been designed for photocatalysts AgnX@Ag (X = Cl−, PO43−, etc.), mainly containing the ion-exchange (metathesis) reaction followed by photoreduction in solution. But they were obsessed by complicated process, the uncontrollability of composition and larger sizes of Ag particles. Here we show a general solid-state route for the synthesis of AgnX@Ag catalysts with hierarchical structures. Due to strong surface plasmon resonance of silver nanoparticles with broad shape and size, the AgnX@Ag showed high photocatalytic activity in visible region. Especially, the composition of AgnX@Ag composites could be accurately controlled by regulating the feed ratio of (NH2OH)2·H2SO4 to anions, by which the performance were easily optimized. Results demonstrate that the metathesis and oxidation-reduction reactions can be performed in solid state at room temperature for nanosynthesis, greatly reducing the time/energy consumption and pollution.

Regulations of silver halide nanostructure and composites on photocatalysis

“…During the overall dye degradation process of AgX, the normalized concentration of dye molecules (ln(C 0 /C)) show linear relationship with irradiation time indicating that these degradations follow the first-order kinetics (Eq. (9)) [299,364,365]. Shown as Fig.…”

Visible-light-driven Photocatalytic N-arylation of Imidazole Derivatives and Arylboronic Acids on Cu/graphene catalyst

“…The conduction electrons of the nanoparticles of gold (Au), silver (Ag) and copper (Cu) can gain visible light energy through the LSPR effect to produce energetic “hot” electrons, which facilitate the reaction process and improve the yield of chemical synthesis under mild conditions 16 . Studies on light-driven reactions catalyzed by plasmonic metal nanoparticles have formed the basis of a new and fast-expanding field in green photocatalysis 17 18 19 20 21 . Linic’s group found that plasmonic nanostructures of silver can concurrently use low-intensity visible light and thermal energy to drive catalytic oxidation reactions-such as ethylene epoxidation, CO oxidation, and NH 3 oxidation at lower temperatures 19 .…”

Room-temperature solid-state synthesis of BiOCl hierarchical microspheres with nanoplates

“…[20][21][22]. It is worth noting that polyethylene glycol 400 (PEG400) played a significant role for the synthesis of BiOCl MSs by a self assembly of nanoplates.…”