State Key Laboratory of Environment Health (Incubation), Key Laboratory of Environment and Health, Ministry of Education, Key Laboratory of Environment and Health (Wuhan), Ministry of Environmental Protection, School of Public Health, Tongji Medical College, Huazhong University of Science & Technology, #13 Hangkong Road, Wuhan, Hubei, 430030, China.
Hubei Center for Disease Control and Prevention, No.6 ZhuoDao Quan North Road, Wuhan 430079, China.
J Hazard Mater. 2018 May 15;350:46-54. doi: 10.1016/j.jhazmat.2018.02.020. Epub 2018 Feb 9.
The nano-sized sorbents restrict their practical application in flow-through system due to excessive pressure. In this study, dumbbell MnO/gelatin composites were synthesized based on the protein-assisted synthesis technology. Then they were immobilized on the amino-modified polymethyl methacrylate (PMMA) plate. SEM, TEM, XRD, XPS and FT-IR were employed to study the surface properties and the adsorption mechanism of MnO/gelatin composites. Adsorption experiments for Pb(II) and Cd(II) ions were performed to study the adsorption isotherms, kinetics, and thermodynamics as well as the influencing factors. The maximum adsorption capacities of Pb(II) and Cd(II) ions were 318.7 mg g and 105.1 mg g respectively. The adsorption process met the pseudo-second-order kinetic model. Subsequently, MnO/gelatin composites modified plates were used to remove the heavy metal ions in surface water and wastewater samples. The removal efficiencies of Pb(II) ion was changed from 83% (wastewater) to 100% (surface water), when the initial concentration was 10 mg L. This device exhibited great application prospect in the removal of heavy metals taking advantage of its high removal efficiency, excellent stability and reusability and ease of operation.
纳米尺寸的吸附剂由于压力过大而限制了其在流通系统中的实际应用。在本研究中，基于蛋白质辅助合成技术合成了哑铃型 MnO/明胶复合材料。然后将其固定在氨基改性的聚甲基丙烯酸甲酯（PMMA）板上。通过 SEM、TEM、XRD、XPS 和 FT-IR 研究了 MnO/明胶复合材料的表面性质和吸附机理。进行了 Pb(II)和 Cd(II)离子的吸附实验，以研究吸附等温线、动力学和热力学以及影响因素。Pb(II)和 Cd(II)离子的最大吸附容量分别为 318.7 mg/g 和 105.1 mg/g。吸附过程符合准二级动力学模型。随后，将 MnO/明胶复合材料修饰板用于去除地表水中和废水中的重金属离子。当初始浓度为 10 mg/L 时，Pb(II)离子的去除效率从 83%（废水）变为 100%（地表水）。该装置具有去除效率高、稳定性和可重复使用性好、操作简便等优点，在重金属去除方面具有广阔的应用前景。
