Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, Harbin Engineering University, 150001, PR China; College of Material Science and Chemical Engineering, Harbin Engineering University, 150001, PR China.
Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, Harbin Engineering University, 150001, PR China; College of Material Science and Chemical Engineering, Harbin Engineering University, 150001, PR China.
J Hazard Mater. 2019 Feb 5;363:248-257. doi: 10.1016/j.jhazmat.2018.09.062. Epub 2018 Sep 27.
A novel phosphonate assisted fabrication dendritic fibrous nanosilica (DFNS)-based adsorbing material was successfully synthesis via organic modification with 3-aminopropyltriethoxysilane (KH550), epichlorohydrin (ECH) and phytic acid (PA) on the grounds of hard-soft-acid-base theory, in which organic phosphorous can be applied for efficient chelating uranium(VI) (U(VI)). The adsorption properties can be evaluated by setting a series parameters (pH, adsorbent dose, contact time, initial U(VI) concentration). It is clear that uranium as a "hard" lewis acid can easily form chelating bond with "hard" donor-ligands so that as-papered PA-DFNS has an excellent adsorption capacity (q = 1106 mg g, 298.15 K), which exhibits a 163% increment compared with that of original DNFS under the same condition. In the meantime, the adsorption equilibrium time of PA-DNFS (t = 60 min) was shortened by 33% compared with that of pristine DNFS. Besides, the PA-DFNS exhibited good removal efficiency and stability under the 0.1 M HNO after 6 cycles, extending the application of PA-DFNS in the field of adsorption.
一种新型膦酸辅助合成的树枝状纤维纳米二氧化硅（DFNS）基吸附材料，通过 3-氨丙基三乙氧基硅烷（KH550）、环氧氯丙烷（ECH）和植酸（PA）的有机修饰，成功地在软硬酸碱理论的基础上合成，其中有机磷可以有效地螯合铀（VI）（U（VI））。通过设置一系列参数（pH、吸附剂剂量、接触时间、初始 U（VI）浓度）来评估吸附性能。很明显，铀作为一种“硬”路易斯酸，很容易与“硬”给体配体形成螯合键，因此所制备的 PA-DFNS 具有优异的吸附能力（q=1106mg g，298.15 K），与相同条件下的原始 DNFS 相比，增加了 163%。同时，PA-DNFS 的吸附平衡时间（t=60 min）比原始 DNFS 缩短了 33%。此外，PA-DFNS 在 6 次循环后的 0.1 M HNO 中表现出良好的去除效率和稳定性，扩展了 PA-DFNS 在吸附领域的应用。
