The precipitation-decomposition method was used to prepare the photocatalyst (Sm-ZnO-Ag). Synthesized catalyst was characterized by X-ray diffraction, field emission scanning electron microscope images, and optical spectroscopy. The activity of photocatalyst of Sm-ZnOAg was checked for the photodegradation of thiazin-type methylene blue (MB) dye in aqueous solution using light emitting diodes/solar illumination. Sm-ZnO-Ag is found to be excellent competent than Ag-ZnO, Sm-ZnO and ZnO nanoparticles. The absorbance of ZnO was shifted into the visible region by the dopants (Ag and Sm). The influences of operational parameters such as initial pH, dose of photocatalyst and dye concentration on photomineralization of MB have been analyzed. Sunlight (16 min) gives excellent results in photocatalytic degradation compared to LED (80 min). The microbial zones of Sm-ZnO-Ag (Nps) showed free radical generation. The Sm-ZnO-Ag catalyst is stable and it's reusable. A degradation mechanism is proposed for the photodegradation of MB under LED/solar light.Electronic supplementary material The online version of this article

In the title compound, [CoCl(CH5N)(C3H10N2)2]Cl2·H2O, the CoIII ion has an octa­hedral coordination environment and is surrounded by four N atoms of two propane-1,3-diamine ligands in the equatorial plane, with another N atom of the methylamine ligand and a Cl atom occupying the axial positions. The crystal packing is stabilized by inter­molecular N—H⋯O, N—H⋯Cl, and O—H⋯Cl inter­actions, generating a three-dimensional network.

In the title compound, [CoCl(C2H7N)(C3H10N2)2]Cl2, the CoIII ion has a distorted octa­hedral coordination environment and is surrounded by four N atoms in the equatorial plane, with the other N and Cl atoms occupying the axial positions. The crystal packing is stabilized by N—H⋯Cl hydrogen bonds, forming a layered arrangement parallel to (1-10).

Photocatalyst (Eu–ZnO–Ag) was synthesized by precipitation-decomposition process. The characterization catalyst by phase and size of catalyst by powder-XRD, morphology of catalyst by FE-SEM and optical properties by UV-visible and emission spectroscopy. The photocatalytic action of Eu–ZnO–Ag was investigated in the photodegradation of methylene blue dye in water under LEDs/ solar light. Eu–ZnO–Ag catalyst is indicating the excellent activity than Ag–ZnO, Eu–ZnO commercial ZnO/TiO2 nanoparticles. Co-dopants (Eu/Ag) shift the light absorbance of ZnO toward visible region. Factor affecting of photodegrdation study by dose, dye, solution pH on of methylene blue dye present solar/LEDs. The Eu–ZnO–Ag is established to be reusable photocatalyst. A potential photodegradation of methylene blue mechanism was discussed under illuminations LEDs/solar light.

In the title compound, [CoBr(C2H8N2)2(C4H11N)]Br2, the cobalt(III) ion has a distorted octahedral coordination environment and is ligated by three N atoms and a bromine ion in the equatorial plane, and by two N atoms occupying the axial positions. In the crystal, the complex cation and the two Br− counter-anions are linked by N—H...Br hydrogen bonds, forming a supramolecular framework.