Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
Environ Sci Pollut Res Int. 2020 Jan;27(3):2588-2598. doi: 10.1007/s11356-019-07026-5. Epub 2019 Dec 12.
Magnetic phosphorylated chitosan composite (P-MCS), an excellent adsorbent for Co(II), was synthesized in this experiment via a facile fabrication. Its removal efficiency was improved by optimizing pH, contact time, and initial concentration. The adsorption isotherms and kinetic models of Co(II) by P-MCS followed the Langmuir model and the pseudo-second-order model, respectively. However, the rate of adsorption was also affected by intragranular diffusion. The maximum adsorption capacity was 46.1 mg g-1 for Co(II). The results of spectroscopic analysis also indicated that good adsorption performance of Co(II) mainly depends on surface chelation between functional groups and metal ions. The saturation magnetic susceptibilities of P-MCS and P-MCS-Co were 22.29 emu g and 18.18 emu g, respectively. The excellent magnetic properties of P-MCS enabled the easy achievement of solid-liquid separation via the use of an external magnetic field. In complex aqueous solutions, K, Na, Ca, and Mg have less influence on P-MCS adsorption Co(II), but the adsorption capacity on Co(II) is still good. This study shows the feasibility of using P-MCS to treat wastewater containing Co(II).
磁性磷酸化壳聚糖复合材料（P-MCS）是一种通过简便制造合成的优秀 Co(II) 吸附剂。通过优化 pH 值、接触时间和初始浓度，提高了其去除效率。P-MCS 对 Co(II) 的吸附等温线和动力学模型分别遵循 Langmuir 模型和准二级模型。然而，吸附速率也受到颗粒内扩散的影响。Co(II) 的最大吸附容量为 46.1 mg g-1。光谱分析结果还表明，Co(II) 的良好吸附性能主要取决于官能团与金属离子之间的表面螯合作用。P-MCS 和 P-MCS-Co 的饱和磁化率分别为 22.29 emu g 和 18.18 emu g。P-MCS 的优异磁性使得通过使用外部磁场很容易实现固液分离。在复杂的水溶液中，K、Na、Ca 和 Mg 对 P-MCS 吸附 Co(II) 的影响较小，但对 Co(II) 的吸附容量仍然很好。本研究表明，使用 P-MCS 处理含 Co(II) 的废水是可行的。
