硅锰复合物的水热合成及对水中Cu2+的吸附

为了提高吸附剂在低pH条件下去除水中重金属离子的效率，通过水热法合成了一种硅锰复合材料。利用N2-吸附脱附、透射电子显微镜（TEM）以及X射线衍射（XRD）技术对制备的材料进行了表征；并将其用于吸附水中的Cu2+，研究了SiO2掺杂量、溶液pH值、初始Cu2+浓度以及吸附时间对吸附效果的影响。结果表明：与纯δ-MnO2相比，当SiO2含量为7.5%~15%，硅锰复合物对Cu2+的吸附量受溶液pH影响较小，在溶液pH=2~4范围内有更高的Cu2+吸附量；等温吸附曲线符合Langmuir等温吸附模型，计算饱和吸附量为84.68~71.12 mg，与实验值十分接近。

Hydrothermal synthesis of silico-manganese composite for Cu2+ adsorption from aqueous solutions

A silico-manganese composite (SMC) material was synthesized by hydrothermal method in order to improve the efficiency of the adsorbent used for removal of heavy metal ions from aqueous solutions with a lower pH value. The as-prepared materials were characterized by N2 adsorption-desorption, transmission electron microscopy and X-ray diffraction techniques. The adsorption of aqueous Cu2+ onto a variety of SMCs was investigated as a function of the SiO2 content, pH value of working solution, initial concentration of Cu2+ and adsorption time. The results showed that the pH dependency for adsorption of Cu2+ on SMCs was lower compared to that on pure δ-MnO2. As a result, higher adsorption capacities of SMC (7.5% to 15% of silica doping amount) for Cu2+ could be observed at a lower solution pH (2 to 4). The Langmuir model was employed to describe the adsorption behavior of Cu2+ onto SMC, and the calculated saturation adsorption capacity of SMC was very close to the experimental value.