二氧化铀-钯-石墨烯纳米复合材料的合成及其催化4-硝基苯酚还原反应的研究

Abstract

Urania-palladium-graphene nanohybrids were synthesized via a solvothermal process in ethylene glycol. With the solvothermal treatment, the Pd nanocrystals surrounded by well-crystallized urania supported on graphene oxide was obtained. This ternary hybrid showed considerably higher catalytic activity than palladium-graphene hybrids toward the reduction of 4-nitrophenol by NaBH4. Besides the smaller sizes of palladium nanoparticles in the ternary hybrids, in which the aggregation of Pd nanoparticles was prevented by urania, the charge transfer between the nano-structured Pd and urania may also contribute to the enhancement of catalytic activity by offering more active sites for adsorption and reaction.

Excellent long-term reactivity of inhomogeneous nanoscale Fe-based metallic glass in wastewater purification

“…Due to rapid increase in water pollution throughout the world, wastewater treatment has become a popular topic [1]. Over the past few decades, numerous materials and methods, such as bio-remediation [2], physical methods [3][4][5], and chemical methods [6,7] including processes with zero valent metals [8], Fenton catalysis [9][10][11], ozonation [12], and photocatalysis [13][14][15], have been developed for wastewater treatment. Among the chemical methods, zero valent iron (ZVI) technology is considered to be one of the most promising approaches because of its low cost, natural abundance, good performance, and ease of operation.…”

2D, Metal‐Free Electrocatalysts for the Nitrogen Reduction Reaction

“…Recently, other p-block-doped 2D carbon materials were synthesized for the NRR by electrochemical methods under ambient conditions, including B-doped graphene and O-doped carbon nanosheets (NSs). [48,51,75,82] Analogously to the nitrogen atom, the electronic properties of pristine carbon materials can be modulated by the doped neighbor atoms, which had different sizes and electronegativities than the carbon atom. A B-doped graphene electrocatalyst was prepared by annealing oxide graphene at high temperatures (900 °C) with boron oxide or other boron compounds (Figure 5a,b).…”

Chemistry of Actinide Centers in Heterogeneous Catalytic Transformations of Small Molecules

“…Whereas Taylor et al focused on uranium oxides and their applications in oxidation, − reduction, and steam forming reactions, Ismagilov reviewed solid-supported, uranium oxide composites and uranium-containing compounds for catalytic reactions in organic synthesis, − syngas production, , Fischer–Tropsch and hydrocracking processes, hydrodesulfurization, and oxidation and reduction reactions . Because of the thermal stability and resistance to catalytic poisons, such as sulfur, water, and chlorine, the application of uranium oxides for purification of waste gases polluting the environment was examined heavily in the past decades. , As the present Review mainly focuses on recent developments in small molecule activation using actinide containing compounds, several interesting publications and break-through observations on catalytic reactions such as the reduction of 4-nitrophenol using urania-palladium-graphene nanohybrids, the oxidation of chlorobenzene and benzyl alcohols, ,,,,− the degradation of Rhodamine B, or Suzuki–Miyaura cross-coupling reactions of aryl halides will not be reviewed herein. Instead, the focus is laid on the catalyst requirements and mechanistic studies on activations of the following small molecules: CO, H 2 O, H 2 O 2 , O 2 , CH 4 , and HCl (Table ).…”

“…139 Because of the thermal stability and resistance to catalytic poisons, such as sulfur, water, and chlorine, the application of uranium oxides for purification of waste gases polluting the environment was examined heavily in the past decades. 140,141 As the present Review mainly focuses on recent developments in small molecule activation using actinide containing compounds, several interesting publications and break-through observations on catalytic reactions such as the reduction of 4-nitrophenol using urania-palladium-graphene nanohybrids, 142 the oxidation of chlorobenzene and benzyl alcohols, 93,102,124,126,143−145 the degradation of Rhodamine B, 146 or Suzuki−Miyaura crosscoupling reactions of aryl halides 147 will not be reviewed herein. Instead, the focus is laid on the catalyst requirements and mechanistic studies on activations of the following small molecules: CO, H 2 O, H 2 O 2 , O 2 , CH 4 , and HCl (Table 3).…”