NATURAL PIROLUSIT PROCESSING INTO NANO ?-MNO2 WITH PERSULPHATE HYDROTHERMAL METHOD

• Main Author: Azhar R, Fazri
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/34704
• Institution: Institut Teknologi Bandung

Pirolusit as main manganese mineral is found abundance and spread all over Indonesia. However, its benefits in Indonesia has not optimum. Therfore there is a high need to do research on the processing pirolusit in order to add its value and benefit. In this research, hydrothermal processing with persulphate was used to purify pirolusit. Pirolusit was reacted with (NH4)2S2O8 0.5 M in hydrothermal conditions at a temperature of 140 °C. Purity of MnO2 and Mn is better after hydrothermal processing based on characterised using SEM-EDX, XRF, Gravimetric, and Volumetric. In addition, hydrothermal persulfate treatment makes pirolusit has a smaller particle size and more crystalline based on characterised using SEM and XRD. To find the optimal results with this method, carried out the hydrothermal time variation, of 36, 48, 60, and 72 hours. Optimization was also carried out by hydrothermal 36 hours over 3 times. The While the optimum results obtained at the hydrothermal time of 60 hours because have the best purity achieve 54,1 % Mn and 85,1 % MnO2, and have a better similarity structure with ?-MnO2. On the other hand, hydrothermal treatment recurrent over 3 times become the purity of Mn and MnO2 has purer in pirolusit achieve 54,5 % Mn and 85,9 % MnO2. The purity of ?-MnO2 obtained from this research has met the specification of lithium ion battery materials that is more than larger from 80 % MnO2, but the nano-order size has not been achieved. ?-MnO2 nano materials in the battery has a high stability of the structure so durability and its energy capacity will be larger.