Abstract: In this paper, in-situ synthesis of manganese dioxide was carried out by using KMnO₄ and MnSO₄ as raw materials and microcrystalline cellulose as a carrier, and then the hierarchical composites were prepared. The microstructure and chemical composition of MnO₂/cellulose were characterized by SEM, EDS, FT-IR and XPS. The effects of time and the concentration of the precursor KMnO₄ on the adsorption of heavy metal ions were also discussed. The results showed that the layered composites MnO₂/cellulose have the highest adsorption capacity to Pb²⁺ when the quality of the precursor KMnO₄ was 4 mmol/L and the time was 400 min. The maximum adsorption capacity to Pb²⁺ can reach 265.3 mg/g.

Key words: microcrystalline cellulose; manganese dioxide; in-situ synthesis; Pb²⁺; hierarchical composites