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

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. SrBi 4 Ti 4 O 15 is a four-layer member of the Aurivillius compound, and one of the interesting properties of SrBi 4 Ti 4 O 15 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 SrBi 4 Ti 4 O 15 was synthesized using Na 2 SO 4 /K 2 SO 4 molten salt method. The diffractogram of all samples revealed that all samples were successfully synthesized in the A 2 1 am 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).