This paper involves the investigation of the calcined Ca-hydroxyzincate dehydrate (CHZ) as solid base catalysts for photocatalytic degradation of methylene blue. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TG-DTA), and UV-Vis spectroscopy were carried out to characterize and evaluate the as-prepared samples. The calcined catalysts performances were promising compared to non-calcined material. All the photocatalysts prepared under different processing temperatures (200, 400 and 600 °C) displayed 100% methylene blue degradation compared to the non-calcined sample with 100% dye removal.

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This work establishes a simple method for synthesising layered double hydroxides (LDHs) powders with coprecipitation. The characteristics of the samples were investigated y X-ray diffraction (XRD), scanning electron microscopy (SEM) and spectrophotometer UV–Vis (DRS). Non-uniform distribution was shown for LDHs samples by SEM. Photocatalytic efficiencies were tested using methylene blue (MB) dye as a model contaminant under UV irradiation. In particular, Zn–Al-Ti LDH exhibited an excellent performance towards MB degradation compared with commercial TiO2 nanoparticles. Methylene blue removal percentage was reached at almost 100%, whereas commercial TiO2 reached a removal rate of only 66% under the same conditions within 20 min. The aim of the current work is to prepare Zn-Al-Ti layered double hydroxides nanocomposite and to evaluate their photocatalytic activity in the removal of methylene blue under UV irradiation.

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The current work reports the synthesis of Fe-doped TiO 2 nanoparticles by simple coprecipitation method and compares their photocatalytic efficiency to three different commercially available TiO 2 (i.e., Sachtopore, Hombikat UV100 and Fluka) using methyl orange (MO) under UV light irradiation. X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS) and transmission electron microscopy (TEM) were used to characterize these synthesized Fe-doped TiO 2 nanoparticles. In fact, the DRS results revealed that the bandgap of doped photocatalysts is smaller compared to undoped TiO 2 , leading to a slight shift in the absorption band towards the beginning of the visible light. In addition, XRD has shown that all samples were well crystallized and have only anatase phase. Accordingly, the photocatalytic investigation revealed that doped TiO 2 exhibited improved photocatalytic efficiency of methyl orange (MO) compared to undoped TiO 2 photocatalysts and depends on iron constituents, TiO 2 types as well as the doses of synthesized nanomaterials. Article Highlights• A simple coprecipitation method for the synthesis of Fe-doped TiO 2 photocatalysts and comparison of their photocatalytic efficiency to undoped TiO 2 .• All Fe-doped TiO 2 showed smaller bandgap compared to undoped TiO 2 with only anatase phase.• Fe-doped TiO 2 improves the photocatalytic degradation of dyes compared to undoped TiO 2 .• Photocatalytic efficiency of these doped TiO 2 depends on their doses, the constituents of iron and TiO 2 types.