Synthesis and characterization of perovskite oxide La0.7Sr0.3CoO3-δ with variation in chelating agent ratio for photocatalytic decolorization of methylene blue

Aliyatulmuna, Adilah, Masfufa, Afifa and Aini, Nur (2025) Synthesis and characterization of perovskite oxide La0.7Sr0.3CoO3-δ with variation in chelating agent ratio for photocatalytic decolorization of methylene blue. Presented at THE 18TH JOINT CONFERENCE ON CHEMISTRY 2023 (18th JCC - 2023): Chemistry for Sustainable Development, Semarang. Indonesia.

Text (Proceeding) 031_MASFUFA_18thJCC23.pdf - Published Version Download (1MB)

Abstract

Abstract. 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.

Item Type:	Conference (Paper)
Keywords:	photocatalytic, methylene blue, perovskite, LSCO
Subjects:	03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry 03 CHEMICAL SCIENCES > 0306 Physical Chemistry (incl. Structural)
Divisions:	Faculty of Mathematics and Sciences > Department of Chemistry
Depositing User:	Nur Aini
Date Deposited:	12 Feb 2026 13:41

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