纳米铁/活性炭新型材料的制备及其对铜离子的吸附性能研究

以活性炭为载体,采用沉淀法制备纳米铁/活性炭新型材料,对活性炭的结构变化进行BET和TEM表征分析,研究纳米铁负载前后活性炭对水中铜离子的吸附能力以及p H值、起始浓度、吸附时间等因素对吸附性能的影响,同时考察其再生性能。结果表明:纳米铁成功负载于活性炭上,随着p H值的增加,吸附容量逐渐增大,当p H=6时,纳米铁/活性炭的最大吸附量为18.73 mg/g,与活性炭相比提高了150%。新型材料对铜离子的吸附过程符合Langmuir和Freundlich吸附模型,对铜离子的吸附量随时间变化的规律符合准二级动力学模型,由于负载的纳米铁阻碍了铜离子向材料表面扩散,其吸附速率仅为0.002 g/(mg·min),与活性炭相比下降了60%左右。新型材料再生效率高,具有较好的应用前景。

Research on preparation of a new material of nano-iron and activated carbon with its adsorptive properties to copper ion

Nano-iron was doped into activated carbon by a simple precipitation method. The new material was characterized by BET and TEM and further it along with activated carbon were evaluated in the adsorptive capacity for different factors such as pH, initial concentrations, adsorption time and under batch tests and regenerability was also conducted. The results showed that nano-iron particles were successfully doped into activated carbon.The adsorption process of the new material was more favorable at high pH value, and when pH equals 6,the maximum adsorptive capacity of nano-iron and activated carbon achieves to 18.73 mg/g, which is higher then that of activated carbon, increases by 150 %. Adsorption isotherm fitted well Langmuir and Freundlich models. And adsorption kinetics fitted well with Pseudo-second-order models, as to the loading nano-iron may cause obstruction of copper diffusion to the active adsorptive sites, in comparing with the adsorption rate of activated carbon, that was only 0.002 g/(mg·min), decreases by 60 % . The new material has a good regenerability and better application prospect.