Preparation and characterization of Cu2O nano-particles and their photocatalytic degradation of fluroxypyr

Cu₂O nano-particles were prepared by the liquid-phase reduction method and the effect of the dispersant was studied. The microstructure, surface morphology and optical properties of Cu₂O nano-particles were characterized by X-ray diffractometer, X-ray photoelectron spectroscopy, nitrogen static adsorption, scanning electron microscope, particle size analysis, ultraviolet visible light spectrophotometer and photoluminescence spectrometer. The photocatalytic degradation of fluroxypyr using Cu₂O was studied by the response surface methodology, and the quadratic multinomial mathematical model was established. The results indicated that the Cu₂O crystal particles prepared using the dispersant of polyvinylpyrrolidone were of high purity with the preferential orientation of (111). The average particle size was 605.4 ± 124.8 nm, the specific surface area was 22.641 m²/g, the band gap was approximately 2.04 eV and the absorption edge was about 650 nm. R² of the established quadratic model was 0.9973 and had good fitness, indicating that the established model was reliable. The optimal degradation conditions were obtained as follows: the initial concentration of fluroxypyr was 11.17 mg/L, the pH of the solution was 12.0 and the H₂O₂ concentration was 15 mg/L. The degradation rate of fluroxypyr could reach 83.2% and the relative error was 1.20%. After nine times of recycling, more than 75% of fluroxypyr could be degraded.

Hollow CuxO (x = 2, 1) micro/nanostructures: synthesis, fundamental properties and applications

In this review, we comprehensively summarize the important advances in hollow Cu_xO micro/nanostructures, including the universal synthesis strategies, the interfacial Cu–O atomic structures as well as the intrinsic properties, and potential applications. Remarks on emerging issues and promising research directions are also discussed.

CeO2 hollow nanospheres synthesized by a one pot template-free hydrothermal method and their application as catalyst support

Uniform ceria hollow nanospheres composed of ceria nanocrystals have been synthesized via a simple one-step hydrothermal method without using any template.

Facile synthesis of Cu2O nanocages and gas sensing performance towards gasoline

Uniform Cu₂O nanocages are prepared via a facile acidic etching method, and exhibit superior sensing performance toward gasoline comparing to the solid Cu₂O nanocubes.

A surfactant free synthesis and formation mechanism of hollow Cu2O nanocubes using Cl− ions as the morphology regulator

Hollow Cu₂O nanocubes were prepared via a surfactant-free route where the CuCl intermediates formed with Cl⁻ ions acted as self-sacrificial template.