Afifa Masfufa, Sumari, Aman Santoso, Nur Aini, Adilah Aliyatulmuna
Synthetic dyes have low biodegradability, encouraging it a challenge for researchers to reduce dye waste levels in the environment. One of the dyes, methylene blue, is removed through photocatalytic decolorization. The photocatalyst used is LaCoO3 doped with Sr to increase its catalytic activity. The aim of this study was to synthesize La0.7Sr0.3CoO3-δ with citric acid as a chelating agent and then La0.7Sr0.3CoO3-δ synthesized as a photocatalyst was applied to produce the optimum percentage of photocatalytic decolorization. Perovskite oxide and citric acid have a mole ratio of 1:2; 1:3; and 1:4. XRD analysis showed that the photocatalysts have a rhombohedral structure and occur an impurity (SrCO3). FTIR analysis showed that the photocatalysts still contained citric acid that had not been completely decomposed. Based on surface area analysis (BET method), LSCO 1:2 photocatalyst has the largest surface area of 9.4 m2/g. In the TGA/DSC analysis, the largest oxygen ion vacancy was owned by LSCO 1:4 (δ = 0.95). Photocatalytic decolorization of methylene blue by La0.7Sr0.3CoO3-δ was performed by variations of: concentration of the photocatalyst, concentration of methylene blue, and temperature. The results showed that the photocatalytic decolorization of methylene blue using LSCO 1:4 was able to achieve 72.04% of 10 mg/L methylene blue with the photocatalyst of 1 mg at 85 °C. © 2024 Author(s).
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jalan Semarang 5, Malang, 65145, Indonesia; Department of Chemistry, Faculty of Science and Technology, UIN Maulana Malik Ibrahim Malang, Jalan Gajayana 50, Malang, 65144, Indonesia
