A novel flake-ball-like magnetic Fe₃O₄/γ-MnO₂ meso-porous nano-composite was synthesized and characterized for defluoridation. Adsorption process, characters, and effects of solution chemistry on the adsorption of flourinion in Fe₃O₄/γ-MnO₂ were evaluated. The results show that the adsorption of fluorinion in the Fe₃O₄/γ-MnO₂ nano-composite is fitted with the Pseudo-first model and the Langmuir model, indicating that the adsorption process of fluorinion in the Fe₃O₄/γ-MnO₂ nano-composite was a physical process and not only controlled by the film diffusion but also controlled by the intra-particle diffusion and surface adsorption. It shows that the adsorption of fluorinion sharply decrease with the increase of pH due to the negative changed surface of Fe₃O₄/γ-MnO₂ in water and the competition of OH⁻ for the active points. The competition from decreases the adsorption of fluoride in the order of Cl⁻ < NO₃⁻ < SO₄²⁻, which relied on the ratio of charge towards radius (z/r) of the anions, and the negatively charged humic acid competed with fluorinion for the adsorption sites. Based on the adsorption results and the XPS analysis, the O

一种新的薄片状球状的磁性的Fe ₃ ö ₄ /γ-MnO的₂介孔纳米复合材料的合成和表征为除氟。吸附过程，字符和上flourinion的以Fe吸附溶液化学的影响₃ ö ₄ /γ-MnO的₂进行了评价。结果表明，氟离子的在Fe的吸附₃ ö ₄ /γ-MnO的₂纳米复合材料装配有所述伪第一模型和Langmuir模型，表明氟离子在吸附过程中的Fe ₃ ö ₄ /γ -MnO ₂纳米复合材料是一个物理过程，不仅受薄膜扩散的控制，而且还受粒子内扩散和表面吸附的控制。它表明，氟离子的吸附急剧随着pH的增加而降低，由于Fe的负变表面₃ ö ₄ /γ-MnO的₂在水和OH的竞争^-为活性点。从竞争减小的氟化物中的Cl的顺序吸附^-  <NO ₃ ^-  <SO ₄ ^2-，这取决于阴离子的电荷与半径之比（z / r），带负电荷的腐殖酸与氟竞争吸附位点。根据吸附结果和XPS分析，O