title: Cation- and Anion-Substituted Potassium Manganese Phosphate, KMnP3O9: Luminescence and Photocatalytic Studies.
abstract: Phosphates as multifunctional materials were of vital importance in the environmental and energy fields. In the present work, a new cyclophosphate, potassium manganese phosphate (KMnP3O9) (hereafter KMPO), was prepared by solid state method. Cations (Ag+and Cu2+) and anion (N3-) were substituted into KMPO lattice via ion-exchange and solid state methods, respectively. The as-prepared materials were characterized by powder X-ray diffraction, SEM-EDS and UV-visible diffuse reflectance spectra. Rietveld refinement was carried out for parent material. All the prepared materials were found to crystallize in the hexagonal lattice and isomorphous with KCoP3O9. The nitrogen content in N3--substituted KMPO was estimated by EDS and O-N-H analysis. The bandgap energy of the cation- and anion-substituted samples was lower compared to that of pristine KMPO. Gouy method was employed to determine the magnetic susceptibility of KMPO. The photoluminescence property of Mn2+in all the samples was studied, and the color coordinates were calculated using CIE 1931 chromaticity. The photocatalytic activity of visible light active material, N3--substituted KMPO, was examined against the degradation of methylene blue and methyl violet at ambient conditions.
authors.affiliation: Department of Chemistry, Osmania University, Hyderabad, India.
authors.forename: Sudhakar Reddy
authors.initials: SR
authors.lastname: Chandiri
authors.affiliation: Department of Chemistry, Osmania University, Hyderabad, India.
authors.forename: Ravi
authors.initials: R
authors.lastname: Gundeboina
authors.affiliation: Department of Chemistry, Osmania University, Hyderabad, India.
authors.forename: Sreenu
authors.initials: S
authors.lastname: Kurra
authors.affiliation: Department of Chemistry, Osmania University, Hyderabad, India.
authors.forename: Ravinder
authors.initials: R
authors.lastname: Guje
authors.affiliation: Department of Chemistry, Osmania University, Hyderabad, India.
authors.forename: Malathi
authors.initials: M
authors.lastname: Maligi
authors.affiliation: Department of Chemistry, Osmania University, Hyderabad, India.
authors.forename: Vithal
authors.initials: V
authors.lastname: Muga