1. Magister Programme Graduate School of Mathematics and Natural Sciences, Sriwijaya University, Palembang, Indonesia
2. Department of Environmental Engineering, Institut Teknologi Sumatera, Lampung, Indonesia
3. Graduate School, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Palembang, Indonesia
4. Center of Inorganic Materials and Coordination Complexes, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Palembang, Indonesia