为解决生物炭缺乏对重金属离子的吸附位点和难以回收利用的问题,CoFe2O4磁性纳米粒子被限制在氮气中,硫共掺杂3D网络生物炭基质(C-CoFe2O4/N,S-BC)设计制作成功。所得C-CoFe2O4/N,由于N的作用,S-BC在单系统或二元系统中对Pb2和环丙沙星(CIP)的去除均具有显着的吸附性能,与N相比,S作为金属离子锚定,无S样品(CoFe2O4/BC)。N,S共掺杂的BC不仅参与吸附反应,而且有效抑制了CoFe2O4纳米粒子的团聚,同时增加了作为载体的活性位点。在单一系统中,CoFe2O4/N,S-BC显示出快速的吸附速率(平衡时间:30分钟)和高吸附容量(Pb2+为224.77mgg-1,400.11mgg-1对于CIP)对Pb2和CIP。吸附过程是拟二阶模型,均衡数据与Langmuir模型有很大的相关性。在二进制系统中,CoFe2O4/N的最大吸附容量,Pb2和CIP的S-BC为244.80mgg-1(CIP:10.00mgL-1)和418.42mgg-1(Pb2:10.00mgL-1),分别。根据实验结果讨论了吸附机理。此外,C-CoFe2O4/N,S-BC具有良好的实际水处理能力,抗干扰能力和稳定的可重用性(八个循环后去除效率>80%)。快速,多功能,可重复使用,和易于分离的吸附性能使C-CoFe2O4/N,S-BC有望用于有效的环境修复。本研究也为复合废水处理吸附材料的构建提供了一种可行的方法。
To solve the problem of biochar lack of adsorption sites for heavy metal ions and the difficulty of recycling, CoFe2O4 magnetic nanoparticles confined in nitrogen, sulfur co-doped 3D network biochar matrix (C-CoFe2O4/N,S-BC) was designed and fabricated successfully. The obtained C-CoFe2O4/N,S-BC displays remarkable adsorption performance for both Pb2+ and ciprofloxacin (CIP) removal at the single or binary system due to the role of N,S as metal ion anchoring compared to the N,S-free sample (CoFe2O4/BC). N,S co-doped BC not only participates in adsorption reaction but also effectively inhibites the agglomeration of CoFe2O4 nanoparticles and increases the active sites as a carrier at the same time. In the single system, CoFe2O4/N,S-BC demonstrates a fast adsorption rate (equilibrium time: 30 min) and high adsorption capacity (224.77 mg g-1 for Pb2+, 400.11 mg g-1 for CIP) towards Pb2+ and CIP. The adsorption process is befitted pseudo-second-order model, and the equilibrium data are in great pertinence with Langmuir model. In the binary system, the maximum adsorption capacity of CoFe2O4/N,S-BC for Pb2+ and CIP is 244.80 mg g-1 (CIP: 10.00 mg L-1) and 418.42 mg g-1 (Pb2+: 10.00 mg L-1), respectively. The adsorption mechanism is discussed based on the experimental results. Moreover, C-CoFe2O4/N,S-BC shows good practical water treatment capacity, anti-interference ability and stable reusability (the removal efficiency>80% after eight cycles). The rapid, multifunctional, reusable, and easily separable adsorption properties make C-CoFe2O4/N,S-BC promising for efficient environmental remediation. This study also offers a viable method for the construction of adsorption material for complex wastewater treatment.