Sintering Temperature Effects on Photocatalytic Activity of SrTi_0.80Mn_0.20O₃

Abstract

SStrontium titanate (STO) is well recognized as promising perovskite photocatalytic material. The catalytic characteristics of STO can be improved by modification with Mn metal. In this study, SrTi0.80Mn0.20O3 has been successfully fabricated using coprecipitation technique with varied sintering temperatures of 700°C, 800°C, 900°C, and 1000°C. This study aimed to investigate the effect of sintering temperature on the photocatalytic activity of SrTi0.80Mn0.20O3. The photocatalyst activity of SrTi0.80Mn0.20O3 could be observed by the degradation of Methylene blue (MB) dye. Based on the X-Ray Diffraction (XRD) and Fourier Transform Infra-Red (FTIR) data, the SrTi0.80Mn0.20O3 has been made. The data also showed that the impurities phases have been reduced and eliminated by the higher sintering temperatures. Nevertheless, all varied samples of the SrTi0.80Mn0.20O3 have successfully exhibited their photocatalyst activity by degrading the MB dye under UV light irradiation with irradiation times of 0, 1, 2, 3, 4, 5, and 6 hours. According to the UV-Vis absorption data, the irradiation time could considerably decline the absorption peaks of MB dye in SrTi0.80Mn0.20O3. Besides, the higher sintering temperature did not influence the absorption peaks position but slightly changed their intensity (at the same irradiation time). Furthermore, the higher sintering temperature and longer irradiation time tended to produce higher DR% of up to 66.63%.

Photocatalysts Comparison of Low Mn-Doped SrTiO₃ (SrTi_1-xMn_xO₃; x=1% and 3%)

“…The absorption peak around 3440, 3443, and 3447 cm −1 can be caused by the strain vibration of hydroxyl lattice from Ti-OH or by Sr-OH [6]. Additionally, the peaks around 1460 and 1466 cm −1 can be attributed to the vibration of C-H [13]. The presence of carbonate compounds shows the impurities in the samples.…”

“…An effective strategy to spread the absorption into the visible region is by doping various elements into the host lattice of these materials. Doping with metals or nonmetals such as Co, Cr, Fe, La, Mn, Na, K, Al, V, and Rh could decrease the band gap of SrTiO3 and later enhance its photocatalytic activity [1,3,4,9,[11][12][13][14]. The materials have been explored for doping and co-doping Sr or/and Ti sites.…”

“…Several studies have reported the synthesis of Mn-doped STO with various methods of hydrothermal, sol-gel, and co-precipitation [13,[16][17][18]. Further, the prior study has reported the use of Mn doping at a high level (0-50%) with the sol-gel to investigate the Mn doping mechanism on STO host structure [17].…”

“…Further, the prior study has reported the use of Mn doping at a high level (0-50%) with the sol-gel to investigate the Mn doping mechanism on STO host structure [17]. Afriani et al also synthesized Mn-doped STO (Mn 20%) using the coprecipitation method and the sintering temperature variation [13]. Studies on the synthesis of Mndoped STO and its characterization still need to be explored through various methods and treatments to maximize its application.…”

Preparation of Nickel (Ni) doped SrTiO3 and effects of sintering temperatures on its properties as photocatalyst

“…Of these techniques, the co-precipitation method can produce powders with high homogeneity. Besides, the technique is easy to control via stoichiometry and easy procedure [19][20][21]. One other essential thing, the sintering temperature plays a crucial role in the material formation.…”