Hierarchical Cu@MnO₂ Core–shell Nanowires: A Nonprecious‐Metal Catalyst with an Excellent Catalytic Activity Toward the Reduction of 4‐Nitrophenol

Abstract

A nonprecious catalyst of hierarchical Cu@MnO2 core–shell nanowires was fabricated by a facile hydrothermal route and the nanostructured material showed a high catalytic activity toward the reduction of 4‐nitrophenol in the presence of NaBH4. With an intact core–shell structure and porous MnO2 shell, the Cu@MnO2 nanowires exhibited an excellent catalytic activity with an activity factor of 571 s−1 g−1 and high recyclability with a conversion of 96 % after seven catalytic cycles.

Shell‐Isolated Nanoparticle‐Enhanced Raman and Fluorescence Spectroscopies: Synthesis and Applications

“…In addition, this procedure has been utilized to protect Ag nanospheres and hollow Ag nanoparticles with the simultaneous adjustment of the solution pH to 12 (Figure i,j) . Chen et al have also synthesized Cu@MnO 2 nanowires by a hydrothermal method using KMnO 4 as the manganese source . A Cu nanowire coated with porous MnO 2 shell was observed in the TEM image (Figure k).…”

“…Copyright 2011, John Wiley & Sons, Ltd. (i−j) Reproduced with permission . Copyright 2016, Elsevier B.V. (k) Reproduced with permission . Copyright 2016, John Wiley & Sons, Ltd. (l) Reproduced with permission .…”

Synthesis of N‐Doped Core–Shell‐Structured Porous CoSe@C Composites and their Efficient Catalytic Activity for the Reduction of 4‐Nitrophenol

“…[5b] Unfortunately, the scarcities and high costs of noble metals limit their practical use. To solve this problem, non‐noble‐metal nanoparticle catalysts have received great attention as they are much more economical than noble‐metal nanoparticles . Recently, transition‐metal selenides have received increasing attention for applications in supercapacitors, rechargeable batteries, and catalysts .…”

Eco‐friendly synthesis from industrial wastewater of Fe and Cu nanoparticles over NaX zeolite and activity in 4‐nitrophenol reduction

“…The aquatic ecotoxicity of 4‐nitrophenol ranges from slight to moderate and may affect growth, accumulation, mating, mortality, and feeding behaviour among other factors . When 4‐nitrophenol (4‐NP) comes in contact with the human body, it damages the skin, and the respiratory and digestive systems . Due to its solubility and stability in water, the U.S. Environmental Protection Agency has listed 4‐NP among the most dangerous pollutants, limiting its concentration in water to 10 ppm .…”

“…When 4‐nitrophenol (4‐NP) comes in contact with the human body, it damages the skin, and the respiratory and digestive systems . Due to its solubility and stability in water, the U.S. Environmental Protection Agency has listed 4‐NP among the most dangerous pollutants, limiting its concentration in water to 10 ppm . The catalytic reduction of 4‐NP to 4‐aminophenol (4‐AP) by NaBH 4 at room temperature may be of interest for those industrial processes whereby 4‐AP is an intermediate, including pharmaceutical processes (for 4‐AP derived analgesics, such as paracetamol and acetaminophen), as well as for the production of dyes, pigments, corrosion inhibitors, and anti‐corrosion lubricants .…”