Luong, H.V.T., Nguyen, N.H., Khuu, G.H., Bui, Y.P., Thieu, Q.Q.V., Ngo, T.N.M. and Tran, T.B.Q. 2022. Preparation of Fe3O4/HAp nanoparticles from eggshells with highly adsorption capacity for methylene blue. CTU Journal of Innovation and Sustainable Development. 14, 2 (Jun. 2022), 18-27. DOI:https://doi.org/10.22144/ctu.jen.2022.015.