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图  1  MnS纳米颗粒的扫描电镜图

Figure 1.  SEM image of MnS nanoparticles

图  2  初始浓度为60 mg·L⁻¹，MnS吸附处理下Cd²⁺浓度和pH随时间的变化

Figure 2.  Change of Cd²⁺ concentration and pH with time for the solution treated by MnS at initial Cd²⁺ concentration of 60 mg·L⁻¹

图  3  MnS在各竞争阳离子共存溶液中的吸附效果

Figure 3.  Adsorption performance of MnS in the solution with coexisting competitive cations

图  4  MnS纳米颗粒对于Cd²⁺去除率保有量随时间变化曲线

Figure 4.  Change of Cd²⁺ removal rate retention by MnS nanoparticles with time

图  5  MnS吸附Cd²⁺的伪二级动力学模型和吸附等温线Langmuir模型拟合图

Figure 5.  Pseudo-second kinetic model, adsorption isotherms and the corresponding Langmuir model fitting curve for Cd²⁺ adsorption by MnS nanoparticles

图  6  MnS纳米颗粒吸附Cd前、后XRD图谱

Figure 6.  XRD patterns of MnS nanoparticle before and after adsorption of cadmium

图  7  MnS纳米颗粒吸附Cd后HR-TEM图

Figure 7.  HR-TEM image of MnS nanoparticles after Cd adsorption

图  8  MnS纳米颗粒吸附过程中Cd²⁺去除量与Mn²⁺释放量

Figure 8.  Cd²⁺ removal amount of and Mn²⁺ release amount during the adsorption process of MnS nanoparticles