Papers by Author: Pei Song Tang

Abstract: Using Er (NO₃)₃·5H₂O and Fe (NO₃)₃·9H₂O as major materials, the ErFeO₃ nanoparticles were prepared by successive microwave processing and high temperature calcination. The samples were characterized by thermogravimetric and differential thermal analysis (TG-DTA), powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-visible diffuse reflectance spectroscopy (DRS). It was found that the single phase ErFeO₃ can be obtained through the calcination of microwave processed ErFeO₃ precursors at 800°C, and the resulting product was approximation flake of 20-80 nm. The visible-light photocatalytic activity of ErFeO₃ nanoparticles was investigated in experimental simulation wastewater containing 10 mg/L methyl orange (MO). The results show that ErFeO₃ nanoparticles appear high photocatalytic activity for the decomposition of MO under visible-light irradiation.

Abstract: Silver ions (Ag⁺) used as secondary ion, cetyl trimethyl ammonium bromide (CTAB) used as surfactant and ascorbic acid(AA) used as reducing agent, the gold(Au) nanorods were synthesized by seed-mediated growth method. The resulting substrates have been characterized by UV-vis spectroscopy. The law of Au nanorods growing was researched by controlling concentration of CTAB, Ag⁺, seed-fluid and AA. The results showed that the optimum reaction conditions are 0.10 M CTAB, 0.1×10^-3 M Ag⁺, 0.0056×10^-3 M AA, 0.48×10^-6 M seed-fluid and system temperature 30°C.

Abstract: The LaFeO3 nanoparticle was synthesized using Fe(NO3)3 and La(NO3)3 as starting materials by homogeneous precipitation method. The as-prepared LaFeO3 product was characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-visible diffuse reflectance spectroscopy (DRS). XRD and SEM demonstrate the successful synthesis of single phase perovskite LaFeO3 and with 60-80 nm particle size. It was found that the as-prepared LaFeO3 shows strong visible-light absorption with absorption onset of 532 nm, indicating a narrow optical band gap of 2.33 eV. Furthermore, the as-prepared LaFeO3 shows high visible-light photocatalytic activity for decomposition of methylene blue in comparison with the commercial Degussa P25.

Abstract: PTT/SEBS-g-MA/organoclay ternary nanocomposites were successfully prepared using melt blending. The effect of organoclay platelets on morphologies properties of PTT/SEBS-g-MA/organoclay ternary nanocomposites had been studied by XRD and SEM. The nanocomposite forms an exfoliated structure, which can be observed by XRD. The dispersed domain size (D) of SEBS-g-MA is affected by organoclay. The high aspect ratio of the organoclay platelets induced the average size of the dispersed domain to become smaller.