Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang 330063, PR China; Department of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, PR China.
Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang 330063, PR China; Department of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, PR China.
Sci Total Environ. 2019 Jan 15;648:1342-1353. doi: 10.1016/j.scitotenv.2018.08.258. Epub 2018 Aug 21.
In this study, a laminated nanocomposite of Y-Zr-Al with significantly high surface area of 256.6 m/g was successfully prepared, and was used to investigate the defluoridation performance of sorbent based on Yttrium. The composite showed high fluoride sorption performance, especially at low F concentration conditions. SEM, BET, Elemental Mapping and XPS were used to characterize physicochemical properties of the composite in detail. Several influence factors including pH, presence of coexisting anions and contacting time were detailly investigated. The sorption course was studied by equilibrium sorption isotherm and sorption kinetics. Based on experimental results, a mechanism for fluoride sorption onto Y-Zr-Al composite was proposed, which revealed that there were three main sorption models, including mesoporous diffusion sorption, electronic interaction sorption and ion exchange, in the sorption course. The composite was considered to be highly potential in treating fluoride polluted waste water due to its high efficiency, high anti-interference ability and easy operation, and the discovery of fluoride highly attractive rare earth element was important to further understand and develop defluoridation sorbents based on rare earth.
在这项研究中，成功制备了具有 256.6m/g 高表面积的层状纳米复合材料 Y-Zr-Al，并用于研究基于钇的吸附剂的除氟性能。该复合材料表现出高的氟离子吸附性能，特别是在低氟浓度条件下。SEM、BET、元素映射和 XPS 被用来详细地表征复合材料的物理化学性质。详细研究了 pH、共存阴离子和接触时间等几个影响因素。通过平衡吸附等温线和吸附动力学研究了吸附过程。基于实验结果，提出了氟离子在 Y-Zr-Al 复合材料上吸附的机理，揭示了在吸附过程中存在三种主要的吸附模型，包括中孔扩散吸附、电子相互作用吸附和离子交换。由于其高效、高抗干扰能力和易操作，该复合材料被认为在处理含氟废水方面具有很高的潜力，并且对氟化物具有高吸引力的稀土元素的发现对于进一步理解和开发基于稀土的除氟吸附剂具有重要意义。
