A Novel Au@Cu2O-Ag Ternary Nanocomposite with Highly Efficient Catalytic Performance: Towards Rapid Reduction of Methyl Orange Under Dark Condition

Abstract

Au@Cu2O core-shell nanocomposites (NCs) were synthesized by reducing copper nitrate on Au colloids with hydrazine. The thickness of the Cu2O shells could be varied by adjusting the molar ratios of Au: Cu. The results showed that the thickness of Cu2O shells played a crucial role in the catalytic activity of Au@Cu2O NCs under dark condition. The Au@Cu2O-Ag ternary NCs were further prepared by a simple galvanic replacement reaction method. Moreover, the surface features were revealed by TEM, XRD, XPS, and UV–Vis techniques. Compared with Au@Cu2O NCs, the ternary Au@Cu2O-Ag NCs had an excellent catalytic performance. The degradation of methyl orange (MO) catalyzed by Au@Cu2O-Ag NCs was achieved within 4 min. The mechanism study proved that the synergistic effects of Au@Cu2O-Ag NCs and sodium borohydride facilitated the degradation of MO. Hence, the designed Au@Cu2O-Ag NCs with high catalytic efficiency and good stability are expected to be the ideal environmental nanocatalysts for the degradation of dye pollutants in wastewater.

A novel Au/electroactive poly(amic acid) composite as an effective catalyst for p-nitrophenol reduction

“…When gold is nanometer-sized, there is a special plasma resonance effect. 38 The peak at 523 nm in the UV-vis spectrum corresponded to Au NPs approximately 15 nm in size, 39 as shown in Fig. 3(a) .…”

“…Compared to other metallic-NP-based catalysts ( Table 1 ), the Au/EPAA composite exhibited high catalytic activity, confirming its potential for practical application. 38–44 …”

UV-Light Mediated Biosynthesis of Silver Nanowires; Characterization, Dye Degradation Potential and Kinetic Studies

“…The rate of reduction of methyl orange without catalyst in the presence of NaBH 4 is very slow (Figure 6a). This poor performance is due to the presence of a high energy barrier of mutually repulsive interactions between the borohydride anion and methyl orange ion, which should be overcome only by a catalyst [62]. Moreover, in the presence of a catalyst only no reduction occurs due to the same interactions as mentioned above (Figure 6b).…”

Recyclable Magnetic Cu/CuFe2O4 Nanocomposites for the Rapid Degradation of 4-NP

“…On one hand, Cu nanocrystals can directly transfer electrons from BH4 − ions to 4-NP. On the other hand, Cu nanocrystals can participate in and boost the electron transfers of neighboring CuFe2O4 nanocrystals between Cu + -Cu 2+ and Fe 2+ -Fe 3+ ion pairs [49][50][51].…”