1. Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Sumatera Utara, Medan, Indonesia;
2. Department of Environmental Science, Graduate Program, Sriwijaya University, Palembang, Indonesia;
3. Key Laboratory of Advanced Materials for Green Growth, VNU University of Science, Vietnam National University, Hanoi, Vietnam;
4. Center for Rubber Science and Technology, Hanoi University Science and Technology, Hanoi, Vietnam