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Amino acid mediated synthesis of luminescent SnO2 nanoparticles
Archita Bhattacharjee,M. Ahmaruzzaman,Asim K. Sil,Tanur Sinha 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
Tin oxide (SnO2) nanoparticles of average sizes 6, 16 and 33 nm were synthesized successfully by asimple chemical precipitation method using an amino acid, glycine at different calcination temperaturesof 200, 400, and 600 8C, respectively. This method resulted in the formation of spherical, polycrystallineSnO2 nanoparticles with a higher degree of monodispersity. The sizes of the SnO2 nanoparticles werefound to be a factor of calcination temperature. The synthesized SnO2 nanoparticles have atetragonal rutile structure. Due to three dimensional quantum confinement effect shown by thesynthesized SnO2 nanoparticles in their electronic spectra, an increase in band gap energy (3.85–4.21 eV) is observed with a decrease in particle size ( 33 to 6 nm). The synthesizednanomaterials were characterized using X-ray diffraction (XRD), Transmission electronmicroscopy (TEM), and Fourier transformed infrared spectroscopy (FT-IR). The optical propertieswere investigated using UV–vis spectroscopy and photoluminescence spectroscopy (PL). Interestingly, the photoluminescence property was shown by the material calcined at 400 8C. The effects of various polar and non-polar solvents on the absorption spectra of the synthesizedSnO2 nanoparticles were studied. The plausible reaction mechanism for the formation of SnO2nanoparticles was also proposed.
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Mohanty Archita,Sukla Lala Behari,Nayak Sumitra,Devi Niharbala 한국자원공학회 2022 Geosystem engineering Vol.25 No.5
Despite the rising demand for lithium-ion batteries and their widespread acceptance, recycling and repurposing end-of-life lithium-ion battery materials is still a work in progress. This will help mitigate the dependence on raw materials and risks of shortage while promoting a circular economy. The present work addresses a hydrometallurgical process to recover Mn from spent LiMn2O4 using sulphuric acid as a lixiviant and Na-D2EHPA as extractant. Effects of various leaching parameters have been studied and the pregnant leach solution has been generated using 1 mol/L H2SO4 with 6% H2O2 at a pulp density of 10 g/L, maintaining the temperature at 30°C at 450 rpm for 1 hour which contained 2.52 g/L Mn and 0.545 g/L of Li. The PLS was subjected to separation using solvent extraction method taking 70% saponified di-(2-ethylhexyl) phosphoric acid (D2EHPA) as extractant. The McCabe-Thiele plot suggested two theoretical stages at O:A ratio of 1:1 using 0.3 mol/L Na-D2EHPA with 99.94% extraction of Mn and 10.2% co-extraction of Li. The co-extracted lithium was removed by scrubbing with MnSO4 solution. The loaded organic containing 2.574 g/L Mn was stripped using 10% H2SO4 at two stages at O: A ratio of 1.5:1 and enriched the concentration of manganese 1.5 times in the stripped solution.
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