biostudies-literatureWang YNational Natural Science Foundation of China10649https://www.ebi.ac.uk/biostudies/studies/S-EPMC9518204biostudies-literatureUnknown19(17)Arsenic (As(III)), more toxic and with less affinity than arsenate (As(V)), is hard to remove from the aqueous phase due to the lack of efficient adsorbents. In this study, a core-shell structured MnO<sub>2</sub>@La(OH)<sub>3</sub> nanocomposite was synthesized via a facile two-step precipitation method. Its removal performance and mechanisms for As(V) and As(III) were investigated through batch adsorption experiments and a series of analysis methods including the transformation kinetics of arsenic species in As(III) removal, FTIR, XRD and XPS. Solution pH could significantly influence the removal efficiencies of arsenic. The adsorption process of As(V) occurred rapidly in the first 5 h and then gradually decreased, whereas the As(III) removal rate was relatively slower. The maximum adsorpInternational journal of environmental research and public healthArsenic Oxidation and Removal from Water via Core-Shell MnO<sub>2</sub>@La(OH)<sub>3</sub> Nanocomposite Adsorption.PMC951820441807358Liu YLi XLu XWang SGuo CZhang LWang YfalseArsenic Oxidation and Removal from Water via Core-Shell MnO<sub>2</sub>@La(OH)<sub>3</sub> Nanocomposite Adsorption.Arsenic (As(III)), more toxic and with less affinity than arsenate (As(V)), is hard to remove from the aqueous phase due to the lack of efficient adsorbents. In this study, a core-shell structured MnO<sub>2</sub>@La(OH)<sub>3</sub> nanocomposite was synthesized via a facile two-step precipitation method. Its removal performance and mechanisms for As(V) and As(III) were investigated through batch adsorption experiments and a series of analysis methods including the transformation kinetics of arsenic species in As(III) removal, FTIR, XRD and XPS. Solution pH could significantly influence the removal efficiencies of arsenic. The adsorption process of As(V) occurred rapidly in the first 5 h and then gradually decreased, whereas the As(III) removal rate was relatively slower. The maximum adsorp2022-01-01T00:00:00Z2022 Aug2025-04-19T05:18:33.477Z2025-04-19T05:18:33.477ZS-EPMC95182043607836410.3390/ijerph191710649