Improvement of Congo Red Photodegradation Performance Through Zn/Al-TiO2 and Zn/Al-ZnO Preparation

Nova Yuliasari (Graduate School of Mathematics and Natural Sciences, Faculty of Mathematics and natural Sciences, Universitas Sriwijaya, Palembang, 30662, Indonesia)
Amri (Magister Program Graduate School of Mathematics and Natural Sciences, Universitas Sriwijaya, Palembang, 30139, Indonesia)
Risfidian Mohadi (Research Center of Inorganic Materials and Coordination Complexes, Faculty of Mathematics and Natural Sciences, Universitas Sriwijaya, Palembang, 30662, Indonesia)
Elfita Elfita (Graduate School of Mathematics and Natural Sciences, Faculty of Mathematics and natural Sciences, Universitas Sriwijaya, Palembang, 30662, Indonesia)
Aldes Lesbani (Research Center of Inorganic Materials and Coordination Complexes, Faculty of Mathematics and Natural Sciences, Universitas Sriwijaya, Palembang, 30662, Indonesia)

Science and Technology Indonesia
Vol. 7 No. 4 (2022): October

Layered double hydroxide (LDH) is an anionic clay material known to be effective as a catalyst for the photodegradation of dye organic pollutants. Zn/Al LDH was synthesized by coprecipitation then impregnated with metal oxides and calcined at 300oC to form Zn/Al-TiO2 and Zn/Al-ZnO as photodegradation catalysts of congo red (CR). The characterization of the catalysts after preparation using SEM and UV-DRS while the catalyst that have been used in 5 regeneration cycles was characterized by XRD and FTIR. Photodegradation of CR was carried out by optimizing pH, catalyst weight, and time radiation. Zn/Al LDH which was modified into Zn/Al-TiO2 and ZnAl-ZnO had a better degradation percentage, rate constant, and stability than Zn/Al LDH pristine structure. Zn/Al LDH, Zn/Al TiO2 and Zn/Al-ZnO catalyzed CR photodegradation for 120 minutes with percent degradation 68.39%, 81.24% and 71.09%, respectively.