新型球形介孔锰锌铁氧体的制备、表征及对亚甲基蓝的吸附特性

Synthesis and characterization of novel spherical mesoporous Mn-Zn ferrite and its adsorption properties of methylene blue

以废旧锌锰电池生物浸提液为前驱体、聚乙烯吡咯烷酮(PVP)为结构导向剂,采用水热法制备了一种新型球形介孔锰锌铁氧体(P-MZF).同时,利用扫描电镜(SEM)、比表面积(SBET)、X-射线衍射(XRD)、高分辨透射电镜(HRTEM)、选区电子衍射(SAED)、红外光谱分析(FT-IR)、X射线光电子能谱分析(XPS)和磁滞回线(VSM)等表征分析了制备的材料,并研究了其对亚甲基蓝(MB)的吸附特性.结果表明,相比于无PVP制备的样品,P-MZF的比表面积SBET(126.7 m^2·g^-1)、活性点位的增加大幅提升了对MB的化学吸附能力;吸附动力学和热力学分析表明,Pseudo second-order和Langmuir模型适合描述其对MB的吸附行为.此外,经过5次循环吸附-醇洗再生,P-MZF对MB的吸附效率仍可维持在93%以上.制备的P-MZF具有高吸附和磁回收简便的优点.

A novel spherical mesoporous Mn-Zn ferrite(P-MZF) was prepared via hydrothermal method using the bioleachate of waste Mn-Zn batteries as precursor and polyvinylpyrrolidone(PVP) as structure-directing agent. The sample was characterized by SEM, SBET, XRD, HRTEM, SAEM, FT-IR, XPS and VSM, and its adsorption properties of methylene blue(MB) was studied. Compared with the sample prepared without PVP, the increases of SBET(126.7 m^2·g^-1) and active site for P-MZF have greatly improved the chemical adsorption capacity of MB. The adsorption kinetics and thermodynamic results show that the adsorption behavior of P-MZF for MB was well represented by the pseudo-second-order and the Langmuir equations. In addition, the adsorption efficiency of P-MZF for MB could still be kept above 93% after 5 cycles of reuse, including five alcohol washing. Overall, the as-prepared P-MZF has the advantages of high adsorption and simple magnetic separation.