Yang Peipei, Li Songwei, Liu Chuntai, Liu Xianhu
National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Materials Processing and Mold (Ministry of Education), Zhengzhou University, Zhengzhou 450002, China.
ACS Appl Mater Interfaces. 2021 Apr 21;13(15):17988-17997. doi: 10.1021/acsami.1c01960. Epub 2021 Apr 11.
Low acid endurance of layered double hydroxides (LDHs) limits their uranium(VI) [U(VI)] adsorption capability from harsh industrial wastewater. Here, we demonstrate magnesium-cobalt LDHs (Mg-Co LDHs) anchored onto the pore channel of dendritic fibrous nanosilica (DFNS) via an interface-constrained strategy. The synergy of Mg-Co LDHs and DFNS not only improves the endurance of the Mg-Co LDH under harsh acidic conditions but also increases the number of active sites of DFNS. Thus, DFNS@Mg-Co LDH shows a high U(VI) uptake capacity (1143 mg g) at pH = 3 and = 598.7 mg L, which is about 4.8-fold higher than that of pristine DFNS. The DFNS@Mg-Co LDH exhibits excellent U(VI) uptake in various background water circumstances due to its acid endurance and highly selective adsorption. This interface-constrained strategy provides LDH materials with durability under extremely acidic conditions along with a high adsorption capacity, which is promising for uranium capture from various water fields.
层状双氢氧化物（LDHs）的耐酸性较低，限制了它们从苛刻的工业废水中吸附铀（VI）[U(VI)]的能力。在此，我们展示了通过界面约束策略将镁钴层状双氢氧化物（Mg-Co LDHs）锚定在树枝状纤维纳米二氧化硅（DFNS）的孔道上。Mg-Co LDHs与DFNS的协同作用不仅提高了Mg-Co LDH在苛刻酸性条件下的耐受性，还增加了DFNS的活性位点数量。因此，DFNS@Mg-Co LDH在pH = 3时表现出高U(VI)吸附容量（1143 mg/g），吸附量为598.7 mg/L，这比原始DFNS高约4.8倍。由于其耐酸性和高选择性吸附，DFNS@Mg-Co LDH在各种背景水条件下均表现出优异的U(VI)吸附性能。这种界面约束策略为LDH材料提供了在极端酸性条件下的耐久性以及高吸附容量，这对于从各种水域中捕获铀具有广阔前景。
