Synthesis and Evaluation Catalytic Efficiency of Perovskite-Type Oxide Nanopowders in Removal of Bromocresol Purple from Aqueous Solution

Abstract

Abstract. A 1-x A x BO 3 belongs to the perovskite oxides of the ABO 3 structure. In this study, nanoparticles of La 0.5 Ca 0.5 FeO 3 were fabricated by sol-gel citrate technique. A series of common analytical techniques were used to characterize the crystallinity, morphology, specific surface area, and grain size of the nanopowders. These properties were characterised by means of XRD, SEM, EDX and FTIR. The calculated particles size using the Scherrer's formula was about 20 nm. Moreover, the family of perovskite-type oxides could be considered as an adsorbent/catalyst material for the removal of dyes. This study has also investigated the efficiency of La 0.5 Ca 0.5 FeO 3 , as an adsorbent for removal of dye (Bromocresol Purple (BP)), from an aqueous solution. The adsorption studies were carried out at different pH values, various adsorbent dosages and contact time in a batch experiments. The kinetic studies indicate that the removal process obeys the Pseudo-first-order kinetic equation. Also, the isotherm evaluations reveal that the adsorption of BP by the nanoparticles follows the Langmuir model. In addition, this nanoparticle with good specific affinity towards dye molecules was a promising adsorbent for dye removal from natural water.

On the mechanism of oxidative degradation of rhodamine B over LaFeO3 catalysts supported on silica materials: Role of support

“…Perovskite oxides with ABO 3 structure have been reported to be promising catalysts for oxidative removal of organic dyes in aqueous solution [11][12][13], owing to their high hydrothermal stability as well as the unique properties such as controllable oxygen vacancy and oxidation state of B-site cation, and the ability to accommodate various metal ions without destroying the matrix structure [14,15]. For example, the iron ions, which are the major components of the traditional Fenton catalyst, can be located in perovskite framework like LaFeO 3 and used as solid catalyst for M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 4 RhB oxidation [16,17].…”