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Luminescent perovskite photocatalysts activated by Pr3+ were prepared by combustion. The structural phase, morphology, and chemical composition of the as-prepared photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) analysis, and ultraviolet–visible (UV–vis) diffuse reflectance spectroscopy. The photocatalytic activities of the synthesized samples were investigated on the basis of the degradation of methylene blue (MB) under UV light irradiation. CaTiO3:Pr3+ was obtained in high purity and good crystallinity with a perovskite structure. The degradation of the photocatalyst was fitted with pseudo-first-order kinetics according to the Langmuir–Hinshelwood model. Compared to CaTiO3:Pr3+, Ca1–xTiO3:Pr3+ (x = 0–0.3) multifunctional materials exhibit higher luminescence intensity and photocatalytic activity toward the degradation of MB. Ca0.8TiO3:0.1%Pr3+ exhibited the best performance. [ABSTRACT FROM AUTHOR]

Nanosized magnesium hydroxide (Mg(OH)2) with sheet and flower structure were prepared via precipitation reaction between magnesium chloride and alkaline precipitant, such as ammonium hydroxide, sodium hydroxide and urea. The structure and morphology of as-prepared samples were characterized through X-ray diffraction and scanning electron microscopy. Effect of precipitants and surface modifier on morphology and size of nano-Mg(OH)2were investigated. Heat-resistance of Mg(OH)2in polymer was discussed by thermogravimetry-differential thermal analysis. Mg(OH)2nanostructure present superior morphology and heat-resistance with NH4OH-NaOH as precipitant and 3mol% acrylic acid as surface modifier. [ABSTRACT FROM PUBLISHER]