Desmilia Putri Ramadhani, Yahmin, Ridwan Joharmawan, Nur Aini, Adilah Aliyatulmuna
The lanthanum-based perovskite oxide as a heterogeneous photocatalyst has attracted much attention due to its high photocatalytic properties and ability to decompose organic compounds. This research aims to study the performance of Sr-doped LaCoO3 perovskite oxide at site A to remove methylene blue dye under UV radiation for 1 hour using variations in catalyst weight, dye concentration, and temperature. Perovskite oxide La1-xSrxCoO3-δ with x of 0.1 to 0.3 was synthesized using the Pechini method, which requires citric acid and ethylene glycol and then characterized by XRD, FTIR, BET, TGA/DSC, and UV-Vis DRS. The characteristics obtained through XRD analysis presented the perovskite oxide La1-xSrxCoO3-δ (x = 0.1-0.3) adopts rhombohedral symmetry in accordance with ICSD data No. 97814. The formed perovskite oxide phase was detected through FT-IR analysis at wave numbers between 418-855 cm-1. The specific surface area of the synthesized La1-xSrxCoO3-δ (x = 0.1-0.3) perovskite oxide was found to be 4-6 m2/g. The oxygen vacancies in La1-xSrxCoO3-δ (x = 0.1-0.3) perovskite oxide obtained based on TGA/DSC analysis ranged from 0.14-0.69. The bandgap energy obtained based on UV-Vis DRS analysis is 2.34-2.57 eV. The results proved that catalyst weight, dye concentration, temperature, and the amount of oxygen ion vacancies affect the performance of Sr-doped LaCoO3 perovskite oxide in removing methylene blue dye. The performance reached 72% by using 1 mg of La0, 7Sr0, 3CoO3-δ catalyst, 10 ppm dye concentration, and 85oC temperature, which has an oxygen vacancy of 0.69. © 2024 Author(s).
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jalan Semarang 5, Malang, 65145, Indonesia; Departement of Chemistry, Faculty Science and Technology, UIN Maulana Malik Ibrahim Malang, Jalan Gajayana 50, Malang, 65144, Indonesia
