一步法制备磁性多孔碳及高效吸附卡马西平

One step preparation of biomass based magnetic porous carbon and efficient adsorption of CBZ

为了资源化利用废弃农林生物质并有效去除水体中卡马西平(CBZ).受“发酵”策略的启发,以KHCO;为活化剂,FeCl;·6H;O为磁性前驱体,通过简便的一步法将杨木屑转化为具有发达孔结构的磁性多孔碳(MPC).通过调整原料配比得到了最佳产物MPC-2-0.3,其比表面积为1002.48m^(2)/g,对50mg/L的CBZ吸附容量为202.70mg/g.SEM和XRD等表征均证明铁纳米粒子成功掺杂到多孔碳中,使多孔碳具有优异的磁分离能力.吸附过程的动力学和等温线更符合拟二级动力学和Langmuir模型,阐明其主要吸附机理为吸附位点、π-π相互作用和氢键作用.MPC-2-0.3在室温和较宽的pH值范围内具有良好的吸附性能,并易于分离和再生.

In order to utilize waste agricultural and forestry biomass as resources and effectively remove carbamazepine(CBZ) from water. Inspired by the “leavening” strategy, poplar sawdust was transformed into magnetic porous carbon(MPC) with developed pore structure by using KHCO;as activator and FeCl;·6H;O as magnetic precursor. The optimum product MPC-2-0.3 was prepared by adjusting the ratio of raw materials. Its specific surface area was 1002.48m^(2)/g and the CBZ adsorption capacity of 50mg/L was 202.70mg/g. SEM and XRD showed that Fe nanoparticles were successfully doped into porous carbon, giving porous carbon excellent magnetic separation ability. The kinetics and isotherms of the adsorption process were more in line with the pseudo second-order kinetics and Langmuir model. It was clarified that the main adsorption mechanisms were adsorption sites, π-πinteraction and hydrogen bonding. MPC-2-0.3 had excellent adsorption performance at room temperature and a wide pH range, and it was easy to separate and regenerate.