The nano-mixed oxides CeO2-TiO2 was synthesized by gel combustion method using polyvinyl alcohol as fuel and mixtures of titanium trichloride and cerium(IV) nitrate at a relatively low calcination temperature of 550°C for 2 h. The prepared CeO2-TiO2 nanoparticles with a specific area of 65.70 m2 g−1 were dispersed in polyurethane matrix in different concentration conditions from 0.0 to 1.5 wt% to study ultraviolet durability following HONDA HES D 6501-97 standards. After 400 h of testing in the QUV accelerate weathering tester, the thin film containing 1 wt% CeO2-TiO2 nano-mixed oxides has presented the noticeable capacity for absorbing ultraviolet light by only 6.8 g.u change in specular gloss at 60° and ΔE = 3.66 in color difference.
In the present article, the adsorbent prepared from laterite with lanthanum and cerium oxides (La2O3-CeO2/laterite (LCL)) was efficiently employed for the removal of arsenite and fluoride from an aqueous environment. The obtained materials were characterized by XRD, SEM, and nitrogen adsorption/desorption. The synthesized LCL exhibited a high adsorption capacity towards arsenite (As(III)) and fluoride. The adsorption of both analytes on LCL, which was well-fitted to a pseudo-second-order equation, was found to be kinetically fast in the first 20 minutes and reached equilibrium at around 180 minutes. Weber’s intraparticle diffusion model in multilinearity using the piecewise linear regression combined with Akaike’s criteria was addressed. The adsorption capacities of LCL calculated from Langmuir’s isotherm model were found to be 67.08 mg·g-1 for arsenite and 58.02 mg·g-1 for fluoride. Thermodynamic parameters presented an endothermic nature of arsenite adsorption but an exothermic nature for fluoride and a negative Gibbs free energy for the spontaneous process of arsenite or fluoride adsorption at the studied temperature range. The excellent adsorption performance and stability make the composite of laterite and La-Ce binary oxides an alternative efficient and cheap adsorbent for the removal of arsenite and fluoride in an aqueous solution.
Polymer nanocomposites are relatively new class of materials. Incorporation of inorganic nanoparticles into a polymer matrix can significantly influence the properties of the matrix. The obtained composite might exhibit improved thermal, mechanical and optical properties. In this study, the CeO 2 -TiO 2 nanoparticles have been applied to modify properties of polyurethane matrix in order to improve the ultra-violet (UV) absorption property of polyurethane thin films. The interdependence of mechanical properties, UV absorption property and the dispersed concentration of CeO 2 -TiO 2 nanoparticles were investigated. Results showed that, the mechanical properties of polyurethane thin films coating CeO 2 -TiO 2 nanoparticles in testing conditions such as film-forming ability, bonded coating and hardness, modulus, adhesion, impact resistance almost unaffected when the containing CeO 2 -TiO 2 nanoparticles ≤ 2 %. The survey sample was qualified; the scratches do not change the composition CeO 2 -TiO 2 ≤ 1 %. Samples containing 0.2 % CeO 2 -TiO 2 nanoparticles showed the best resistance to discoloration and most influential causes less of gloss paint. The aim of the present work is to investigate the mechanical properties and UV absorption property of CeO 2 -TiO 2 nanoparticles/urethane thin films. It is expected that the CeO 2 -TiO 2 nanoparticles would enhance the UV absorption properties of resulting CeO 2 -TiO 2 nanoparticles/urethane thin films.
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