Green synthesis and formation mechanism of cellulose nanocrystal-supported gold nanoparticles with enhanced catalytic performance

Green-synthesized gold nanoparticles from Plumeria alba flower extract to augment catalytic degradation of organic dyes and inhibit bacterial growth

“…Significantly, PAGNPs2 exhibits an excellent catalytic degradation of 4-NP by converting it to 4-AP within 5 min, and this improved catalytic efficacy can be correlated with its particle size. Comparing this catalytic potential of the PAGNPs2 sample with previous reports, there is a report that nanocrystalsupported gold nanoparticles caused the degradation of 4-NP in 14 min (Wu et al, 2014) and, in another study, catechincapped gold nanoparticles have been reported to exhibit the same degradation activity in 30 min (Choi et al, 2014), while our PAGNPs2 sample exhibits better catalytic degradation within 5 min.…”

Mesoporous TiO2 nanofibers with controllable Au loadings for catalytic reduction of 4-nitrophenol

“…The catalytic application of our prepared Au/TiO 2 hybrid nanofibers were examined by the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) with NaBH 4 aqueous solution at room temperature. The mechanism of catalytic reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride on the Au/TiO 2 nanofibers is shown in Scheme 2 [49,50]. The Au nanoparticles supported on TiO 2 nanofibers triggered the catalytic reaction by relaying electrons from the BH 4 − donor to the acceptor molecules of 4-nitrophenol, and the reduction reaction was achieved.…”

Cellulose nanocrystal zero-valent iron nanocomposites for groundwater remediation

“…The modelled C ultimate and calculated empirical rate constant (eqn (3)) are 302, 146 and 132 mg l −1 and k is equal to 0.39, 0.41, and 0.34 min −1 for bare-nano-ZVI, CNC-nano-ZVI and CNC-COOH-nano-ZVI, respectively. Unlike stabilization methods reported previously, 23–25,47 the use of nanocellulose as a support material does not decrease the reactivity of nano-ZVI, but rather, increases it. For example, the use of polymer coating has been shown to reduce the nano-ZVI reactivity by limiting pollutant interaction with the nano-ZVI reactive site.…”

“…The synthesis of nanomaterials in the presence of CNCs has been reported previously. 22,23 CNCs with hydroxyl groups were used as a support for Pd(0) and Au(0) particle growth, with nanometals well dispersed on the CNC surface by C═O–metal binding and/or electrostatic interactions. 23,24 CNC functionalized with carboxyl groups, to enable C═O–Ag binding, has also been used to stabilize nano-Ag(0).…”

“…22,23 CNCs with hydroxyl groups were used as a support for Pd(0) and Au(0) particle growth, with nanometals well dispersed on the CNC surface by C═O–metal binding and/or electrostatic interactions. 23,24 CNC functionalized with carboxyl groups, to enable C═O–Ag binding, has also been used to stabilize nano-Ag(0). 25 CNC-Au was observed to degrade 84% of 4-nitrophenol (4-NP), whereas unsupported Au nanoparticles degraded only 35% after 14 min of reaction (Au 0.2 mol, 4-NP 0.12 mM).…”