Ce_1- O₂Cu Nanoparticles: Synthesis, Characterization and Catalytic Activity for Phenol Degradation

Area of Science:

• Materials Science
• Catalysis
• Environmental Chemistry

Background:

• Ceria (CeO₂) is a versatile material with applications in catalysis.
• Doping ceria can modify its properties, such as oxygen vacancy concentration and surface area.
• Understanding the structural and chemical changes induced by doping is crucial for optimizing catalytic performance.

Purpose of the Study:

• To synthesize solid solutions of copper oxide (CuO) in ceria (CeO₂) using the solution combustion method.
• To characterize the structural, morphological, and chemical properties of the synthesized Cu-doped CeO₂ materials.
• To investigate the efficacy of Cu-doped CeO₂ as a catalyst for phenol degradation and optimize reaction conditions.

Main Methods:

• Solid solutions of CuO in CeO₂ were prepared via solution combustion.
• Characterization techniques included X-ray Diffraction (XRD), Raman spectroscopy, Transmission Electron Microscopy (TEM), and X-ray Photoelectron Spectroscopy (XPS).
• Phenol degradation experiments were conducted to evaluate catalytic activity under varying phenol concentrations, pH, and catalyst loading.

Main Results:

• Solution combustion successfully incorporated Cu²⁺ ions into the CeO₂ lattice, creating oxygen vacancies and lattice distortion.
• Cu doping led to decreased lattice parameters, smaller crystallite sizes, and increased surface area.
• XRD and Raman spectroscopy confirmed the cubic fluorite structure of CeO₂ with peak shifts indicating symmetry breaking. TEM showed average particle size of 27.4 nm. XPS confirmed Cu²⁺ species.
• Phenol degradation efficiency decreased with increasing initial phenol concentration.
• Maximum degradation efficiency was achieved at pH 3 and a catalyst concentration of 0.5 g/L.

Conclusions:

• The solution combustion method is effective for synthesizing Cu-doped CeO₂ with desirable structural modifications.
• Cu-doped CeO₂ exhibits enhanced properties suitable for catalytic applications, specifically in phenol degradation.
• Optimized conditions (pH 3, 0.5 g/L catalyst) are crucial for maximizing phenol removal efficiency using Cu-doped CeO₂.