Eco-Friendly Synthesis and Characterization of Plate-Like Fe doped SrBi4Ti4O15 by Molten Salt Method

Abstract

The molten salt method is one of the eco-friendly synthesized compound which releases the minimum amount of toxic chemicals. In addition, the molten salt method also have morphology tuning ability, therefore it gives a better opportunity for compound synthesizing. SrBi4Ti4O15 is a four-layer member of the Aurivillius compound, and one of the interesting properties of SrBi4Ti4O15 is photocatalyst. Doped with metal element is strategy to reduced band gap energy of photocatalyst material as purposes to increase its utilization under a wider visible light spectrum. Here in, Fe doped SrBi4Ti4O15 was synthesized using Na2SO4/K2SO4 molten salt method. The diffractogram of all samples revealed that all samples were successfully synthesized in the A21am space group with no impurity phase. Raman spectra confirmed the existence of typical Raman vibration peak for a four-layer Aurivillius family compound. SEM images showed that the Fe doped SBT particle shape is plate-like, and there are no agglomerations formed. Meanwhile, the UV-Vis DRS spectra revealed that Fe dopant could effectively reduce the band gap energy and resulted in obvious red shift absorption to the wider visible light region (530–705 nm).