Rapid Catalytic Reduction of 4-Nitrophenol and Clock Reaction of Methylene Blue using Copper Nanowires

Abstract

Copper nanowires (CuNWs) with a high aspect ratio of ~2600 have been successfully synthesized by using a facile hydrothermal method. The reductions of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) and methylene blue (MB) to leucomethylene blue (LMB) by using sodium borohydride (NaBH4) were used as models to test the catalytic activity of CuNWs. We showed that by increasing the CuNWs content, the rate of reduction increased as well. The CuNWs showed an excellent catalytic performance where 99% reduction of 4-NP to 4-AP occurred in just 60 s by using only 0.1 pg of CuNWs after treatment with glacial acetic acid (GAA). The rate constant (kapp) and activity factor (K) of this study is 18 and ~1010 fold in comparison to previous study done with no GAA treatment applied, respectively. The CuNWs showed an outstanding catalytic activity for at least ten consecutive reusability tests with a consistent result in 4-NP reduction. In clock reaction of MB, approximately 99% of reduction of MB into LMB was achieved in ~5 s by using 2 μg CuNWs. Moreover, the addition of NaOH can improve the rate and degree of recolorization of LMB to MB.

Autocombustion‐Promoted Synthesis of Lanthanum Iron Oxide: Application as Heterogeneous Catalyst for Synthesis of Piperidines, Substituted Amines and Light‐Assisted Degradations

“…It was thus deduced that this was due to the inefficiency of the catalyst to hand-over excess electrons. [146] Moreover, the reduction was also tried without the addition of NaBH 4 that is only in the presence of catalyst. As expected the only existence of the catalyst proved not to be ample for reduction.…”

“…By virtue of which the reduction rate also diminished. [146] The optimized conditions obtained from the present prototype were implemented for the reduction of other NACs as well. The results of the conversion are shown in Table 6 and Figure 15, Figure 16.…”

Hollow N‐ZIFs@NiCo‐LDH as highly efficient catalysts for 4‐nitrophenol and dyes

“…Therefore, a NaBH 4 concentration of 0.2 M could be used in further experiments. [44][45][46] It is well known that organic dyes have a high toxicity, including carcinogenic and mutagenic effects. They damage plants and animals and pose a threat to human health due to the difficulty of their biodegradation.…”

Copper Nanowires as Highly Efficient and Recyclable Catalyst for Rapid Hydrogen Generation from Hydrolysis of Sodium Borohydride

“…Lately, many researchers have been exploring the use of metal nanocrystals in applications such as catalysis, electrocatalysis, sensor design, antimicrobial materials, and flexible transparent electrodes [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. Nanocoppers (Cu) of one-dimensional shape have received attention due to their high electrical conductivity [ 8 ].…”