Structural and Magnetic Properties of MnZnO composites synthesized from waste alkaline and Zn/C batteries.

GALLEGOS, MARÍA V.; ANDRES PELUSO; DAMONTE, LAURA C.; JORGE SAMBETH

Roma

Congreso; International Symposium on Metastable, Amorphous and Nanostructured Materials (ISMANAM 2018); 2018

Spent alkaline and zinc?carbon batteries were subjected to a biohydrometallurgy process, in order to recover manganese and mixed manganese zinc oxides. The obtained products were used as starting materials for several new compositional systems containing manganese which crystallized in the spinel structure being their structural and magnetic properties also studied. Two solids were synthesized, one of them prepared by chemical precipitation with NaOH (ZnMnR) and KMnO4 (OMR). The solids were filtered, washes with distilled water, dried at 120ºC and calcined in air at 500ºC during 2 h. Mn and Zn content were determined by atomic absorption spectrophotometry (AAS) using a Varian AA 240 spectrophotometer. Quantitative analysis of the composition of the samples were carried out with a scanning electron microscope provided with energy dispersive X-ray analysis (SEM-EDS) using a Philips SEM 505 microscope. Prepared materials have been extensively characterized using transmission electron microscopy (TEM, JEOL JEM-100CXII), X-ray diffraction (XRD) and FTIR spectroscopy. Optical characterizations were carried out by measuring the diffuse reflectance spectroscopy. All spectra were taken in the range of 200-800 nm using a Perkin Elmer Lambda 35 UV-vis spectrophotometer with integrating sphere attachment. The magnetic properties of the samples were measured by a Quantum Design MPMS-5S superconducting quantum interference device (SQUID) magnetometer at different temperatures. The effect of Mn content on the optical and magnetic properties was analyzed in order to evaluate the use of the recovered materials for different technological applications.