Nguyen, T.H. and Duong, T.H.N. 2020. Separation and recovery of Co(II) and Li(I) from spent lithium-ion mobile phone bat-teries. CTU Journal of Innovation and Sustainable Development . 12, 2 (Jul. 2020), 60-67. DOI:https://doi.org/10.22144/ctu.jen.2020.017.