Key Laboratory of New Membrane Materials, Ministry of Industry and Information Technology, School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China.
Key Laboratory of New Membrane Materials, Ministry of Industry and Information Technology, School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China.
Sci Total Environ. 2020 Sep 15;735:139399. doi: 10.1016/j.scitotenv.2020.139399. Epub 2020 May 12.
A novel adsorbent of temperature sensitive urea-formaldehyde (TS-UF) resin was synthesized by base/acid two-step synthetic strategy with low formaldehyde/urea mole ratio of 0.8. The sorption kinetics of TS-UF resin obeys the pseudo-second-order model, and the adsorption is an endothermic process. The Langmuir model can well describe the sorption isotherms, through which the Q is calculated to be 99.2 mg/g for uranium (VI) at pH 6.0 and T = 298 K. The characterized results show that the functional groups -NH- and -CHOH in TS-UF resin have been involved in uranium sorption via chemical interaction. The temperature sensitive property of TS-UF resin significantly accelerates the regeneration of TS-UF resin, which can be fast regenerated within 15 min at its low critical solution temperature 333 K and exhibits high removal efficiency of uranium (VI) (>90%) over 5 cycles. Therefore, TS-UF resin can be as a promising sorbent for the uranium (VI) removal from wastewater due to its low-cost, easy-fabrication, high-efficiency and fast regeneration. This work can not only boost the exploration of novel adsorbent materials, but also promote the investigations of the regeneration and reusability of adsorbents.
一种新型的温度敏感脲醛（TS-UF）树脂吸附剂，采用碱/酸两步合成策略，甲醛/尿素摩尔比低至 0.8。TS-UF 树脂的吸附动力学符合准二级模型，吸附是一个吸热过程。Langmuir 模型可以很好地描述吸附等温线，通过该模型计算得到，在 pH 6.0 和 T=298 K 时，铀（VI）的 Q 值为 99.2 mg/g。表征结果表明，TS-UF 树脂中的-NH-和-CHOH 官能团通过化学相互作用参与了铀的吸附。TS-UF 树脂的温度敏感性显著加速了其再生过程，在其低临界溶液温度 333 K 下，15 分钟内即可快速再生，并在 5 个循环中表现出对铀（VI）的高去除效率（>90%）。因此，由于其低成本、易于制备、高效和快速再生，TS-UF 树脂有望成为从废水中去除铀（VI）的理想吸附剂。本工作不仅可以推动新型吸附剂材料的探索，还可以促进对吸附剂的再生和重复使用的研究。
