生物基磁性整体式碳球的制备及其对Cr(Ⅵ)吸附性能的研究

Biomass-derived magnetic monolithic carbon beads for Cr(Ⅵ) efficient adsorption from water

利用Ca^(2+)交联的海藻酸钠水凝胶球体为前驱材料,结合离子交换引入Fe^(3+),通过可控碳化手段制备得到磁性整体式碳球。在间歇吸附实验条件下,其最大Cr(Ⅵ)吸附量可达143.2mg/g;实验数据符合拟二级动力学模型和Langmuir等温吸附模型。与纳米级磁性吸附剂或粉末活性炭相比,所合成的整体式吸附剂不仅具有更高的机械强度,同时更有利于回收和再利用,使其具备一定的应用潜力。

Multifunctional monolithic carbon beads were prepared using Ca^2＋cross-linked sodium alginate hydrogel spheres as starting material via combinatorial ion-exchange and controllable carbonization process.Under batch adsorption testing condition,the resultant beads exhibited the maximum adsorption capacity of 143.2 mg/g.The adsorption kinetics was better fitted the pseudo-second order,the adsorption isotherm was well described by Langmuir isotherm model.As compared to those popular nanoscale magnetic sorbents and powdered activated carbon,this kind of micrometer-sized carbon beads possessed better mechanic stability and recovery performance,making it be promising candidate for practical application.