Co-Innovation Center for Efficient Processing and Utilization of Forest Products, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
Key Laboratory for Organic Electronics & Information Displays and Institute of Advanced Materials, Nanjing University of Posts and Telecommunications, Nanjing, 210046 Jiangsu, China.
J Nanosci Nanotechnol. 2021 Mar 1;21(3):1694-1702. doi: 10.1166/jnn.2021.19032.
In this paper, novel Ethylenediaminetetraacetic acid disodium salt (EDTA) functionalized magnetite/ chitosan nanospheres (Fe₃O₄/CS-EDTA) are synthesized by combining solvothermal method and chemical modification, and they are further applied as a kind of adsorbent to eliminate dye of methylene blue (MB) from wastewater. The properties as well as structure exhibited by the fabricated adsorbent are characterized through FTIR, XRD, TG and TEM, together with VSM. The impact exerted by sorption parameters (time of contact, initial dye concentration, temperature, etc.) on the adsorptions were evaluated in batch system. These results demonstrated that our magnetic materials held the adsorption capacity for MB of 256 mg g (pH = 11), and the kinetic model of pseudo-second-order and the Langmuir model could make an effective simulation regarding the adsorption kinetics and isotherm, respectively. Besides, the external magnetic field can assist in easily separating dye adsorbed Fe₃O₄/CS-EDTA from solution for regeneration. The removal efficiency of recycled adsorbents remained above 92% in the 5th adsorption/desorption cycle. These superioritiesmake Fe₃O₄/CS-EDTA a high-efficientmultifunctional adsorbent for removing dyes from wastewater.
本文通过溶剂热法和化学修饰相结合，合成了新型乙二胺四乙酸二钠（EDTA）功能化的磁铁矿/壳聚糖纳米球（Fe₃O₄/CS-EDTA），并将其进一步用作吸附剂，以去除废水中的亚甲基蓝（MB）染料。通过 FTIR、XRD、TG 和 TEM 以及 VSM 对制备的吸附剂的性能和结构进行了表征。在批处理系统中评估了吸附参数（接触时间、初始染料浓度、温度等）对吸附的影响。结果表明，我们的磁性材料对 MB 的吸附容量为 256 mg g（pH = 11），准二级动力学模型和 Langmuir 模型分别可以有效地模拟吸附动力学和吸附等温线。此外，外部磁场可以辅助从溶液中轻松分离吸附染料的 Fe₃O₄/CS-EDTA 以进行再生。在第 5 次吸附/解吸循环中，回收吸附剂的去除效率仍保持在 92%以上。这些优势使 Fe₃O₄/CS-EDTA 成为一种从废水中去除染料的高效多功能吸附剂。
