Abstract
Three members of the A- site doped Nb perovskites with general formula Sr3NbO5.5, BaSr2NbO5.5 and Ba2SrNbO5.5 were synthesised by solid-state methods and their removal efficiency of Methyl violet from aqueous solutions investigated. The X-ray diffraction measurements demonstrated that the three samples have a faced cubic perovskite-type structure in space group Fm m. The addition of Ba2+ into the A-site of Sr3NbO5.5 has influenced the cell volume, crystal size and density. Subsequently, the removal capacity was also impacted. The crystallite size of the oxides was determined to be less than 82 nm. The maximum removal capacities of Methyl violet are found to be 46.5, 13.1 and 8.0 mg/g using Ba2SrNbO5.5, BaSr2NbO5.5 and Sr3NbO5.5 respectively. The amounts of the dye adsorbed by the oxides have increased as the Ba2+ content increased. The removals of Methyl violet have positive relationship with pH, temperature and the mass of the oxides.
Highlights
The enormous increase in organic water pollution has generated a broad interest in developing new materials for environmental catalysis applications [1]
The amount of O2 adsorption and the intensity of α type adsorption peak are related to non-stoichiometry and structural defect, where the decrease in α type adsorption temperature is consistent with increasing in d electrons of the transition metals
Methyl violet has been used in vast quantities for textile and paper dyeing, and 15% of such dyes produced worldwide are released to environment in wastewater
Summary
The enormous increase in organic water pollution has generated a broad interest in developing new materials for environmental catalysis applications [1]. The physical properties of such oxides can be influenced by the differences in the effective charges, the ionic radii and the electron configurations of both the A and B- site cations. Methyl violet 10B (MV) is known in medicine as Gentian violet and is the active ingredient in a Gram stain, used to classify bacteria [10]. It is used as a pH indicator, with a range between 0 and 1.6. Batch mode removal studies were carried out by varying several parameters such as contact time, pH, temperature and mass of prepared oxide (adsorbent). The oxide samples were separated from solutions using centrifuge 3500 CPM for 5 minutes
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