Controllable synthesis of mussel-inspired catechol-formaldehyde resin microspheres and their silver-based nanohybrids for catalytic and antibacterial applications

Abstract

Size-controlled CFR microspheres and their silver-based nanohybrids were constructed and the nanohybrids display high catalytic reduction activity and antibacterial properties.

In situ deposition of silver nanoparticles on polydopamine‐coated manganese ferrite nanoparticles: Synthesis, characterization, and application to the degradation of organic dye pollutants as an efficient magnetically recyclable nanocatalyst

“…These reactions can be monitored from the disappearance of the color of the dye solutions after the addition of the catalyst and excess amount of NaBH 4. [ 37,38,56 ] In line with the literature, a gradual decrease in the maximum absorbance values of 4‐NP (~410 nm) and MB (~670 nm) aqueous solutions, involving MnFe 2 O 4 @PDA‐Ag and NABH 4 , as a function of time in the UV‐Vis spectra, was observed together with the color bleaching of their aqueous solutions from yellow (4‐NP) and blue (MB) to colorless, respectively (Figure 5a,b). These results confirm the successful degradation of 4‐NP and MB to 4‐aminophenol (4‐AMP) and leucomethylene blue (LMB) forms, respectively.…”

“…These results confirm the successful degradation of 4‐NP and MB to 4‐aminophenol (4‐AMP) and leucomethylene blue (LMB) forms, respectively. [ 56 ] Furthermore, it could be also concluded that the reduction of NO 2 (4‐NP) and CN (MB) chromophore groups to NN and CN was accomplished by the deposited AgNPs on MnFe 2 O 4 @PDA nanocomposite surface, respectively. [ 46,57 ]…”

Reductant free green synthesis of magnetically recyclable MnFe2O4@SiO2-Ag core- shell nanocatalyst for the direct reduction of organic dye pollutants

“…The color bleaching of the aqueous solutions together with the leveling off the UV-Vis bands after gradual decreases were also indicated the completion of the reduction reactions successfully. These results confirmed the successful degradation of MB and RhB to their leuco forms [34,[57][58][59][60] by means of the redox reactions appearing on the surface of the electron relay systems (AgNPs) enabling the transfer of surface hydride ion electrons from BH4to the target acceptor dyes MB and RhB [48, 60,61]. Possible reduction mechanism of the MB and RhB by MnFe2O4@SiO2-Ag was illustrated in Scheme 2.…”

Construction of Polymer-Decorated Fe3O4@Catechol-formaldehyde Resin Amphiphilic Janus Nanospheres for Catalytic Applications

“…33 Recently, our research group has successfully developed a facile method to prepare size-controllable catechol-formaldehyde resin (CFR) microspheres with uniform particle size distribution by a solvothermal method under alkaline conditions. 34 The two hydroxyl groups of catechol have a similar structure to mussel functional polydopamine (PDA), so it also has many outstanding advantages of PDA. Interestingly, the catechol groups in PDA not only can be converted to quinone groups by oxidation under alkaline conditions but can also coordinate or reduce metal ions to metal nanoparticles.…”

“…Phenolic resin organic nanomaterials have advantages of a rich surface structure, easy modification, adjustable size, low price, easy preparation, and so forth and have been widely used in the preparation of various functional materials . Recently, our research group has successfully developed a facile method to prepare size-controllable catechol-formaldehyde resin (CFR) microspheres with uniform particle size distribution by a solvothermal method under alkaline conditions . The two hydroxyl groups of catechol have a similar structure to mussel functional polydopamine (PDA), so it also has many outstanding advantages of PDA.…”