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Preparation of magnetic chitosan/C@Fe3O4 composite for removal of Cu2+ vĂ  Pb2+ ion in aqueous solution. Vietnam j. catal. adsorp. [Internet]. 2023 Sep. 30 [cited 2025 Apr. 21];12(3):89-94. Available from: https://jca.edu.vn/index.php/jca/article/view/2023.052