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Vol. 29 No. 9 (2017): Vol 29 Issue 9

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Cyclic Voltammetry and Electrochemical Impedance Spectral Properties of MnO2 Obtained by Waste Discarded Batteries Using Eco-Friendly Leaching Materials

https://doi.org/10.14233/ajchem.2017.20743
M. Mylarappa
Department of Chemistry, AMC Engineering College, Bannerghatta Road, Bengaluru-560 083, India; Department of Studies and Research in Chemistry, Tumkur University, Tumkur-572 103, India
V. Venkata Lakshmi
Department of Chemistry, AMC Engineering College, Bannerghatta Road, Bengaluru-560 083, India
K.R. Vishnu Mahesh
Department of Chemistry, Dayananda Sagar College of Engineering, Bengaluru-560 078, India
H.P. Nagaswarupa
Department of Chemistry, East West Institute of Technology, Bengaluru-560 091, India
N. Raghavendra
Centre for Manufacturing Research & Technology Utilization, RV College Campus, Bengaluru-560 059, India

Corresponding Author(s) : V. Venkata Lakshmi

laxmimurthy@rediffmail.com

Asian Journal of Chemistry, Vol. 29 No. 9 (2017): Vol 29 Issue 9

Abstract

This paper reports the recovery of zinc and manganese using hydrometallurgical method from spent dry cell batteries. For the recovery of zinc and manganese present within the spent dry cells are meted out by two acidic subtractive leachants specifically oxalic acid and hydrogen peroxide. The chemical analysis of metals from dry cell batteries were performed by using atomic absorption spectroscopy (AAS). The fundamental composition of recovered metals from dry cell batteries were confirmed by energy dispersive X-ray analysis (EDAX). The section composition of the recovered metals from dry cell batteries were confirmed from X-ray diffractometer. Surface morphology of the recovered metals were examined using scanning electron microscopy (SEM). The functional group analysis were done by Fourier transform infrared (FTIR) analysis. Oxalic acid and hydrogen peroxide were showing active leachants on the recovery of zinc and manganese. Leaching yields of both zinc and manganese higher at leach temperature of 90 °C and NaOH was used as precipitating agent for the recovery of Mn as MnO2. The cyclic voltammetry (CV) shows the more reversibility of the electrode and electrochemical impedance spectroscopy (EIS) reveal charge transfer resistance (Rct) and capacitance of electrode. The electrode using 0.5 M NaOH has lowest Rct and more capacitance among all the electrolytes, indicating better conductivity and confirmed that the charge transfer resistance and capacitive behaviour is faster.

Keywords

Waste dry cell Leachants Electrochemical MnO2 Zinc Manganese Cyclic voltammetry
Mylarappa, M., Lakshmi, V. V., Mahesh, K. V., Nagaswarupa, H., & Raghavendra, N. (2017). Cyclic Voltammetry and Electrochemical Impedance Spectral Properties of MnO2 Obtained by Waste Discarded Batteries Using Eco-Friendly Leaching Materials. Asian Journal of Chemistry, 29(9), 2016–2024. https://doi.org/10.14233/ajchem.2017.20743
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