National Demonstration Center for Experimental Comprehensive Chemical Engineering Education, Shanxi Province Key Laboratory of Functional Nanocomposites, School of Chemical Engineering and Technology, North University of China, Taiyuan, Shanxi, 030051, PR China.
National Demonstration Center for Experimental Comprehensive Chemical Engineering Education, Shanxi Province Key Laboratory of Functional Nanocomposites, School of Chemical Engineering and Technology, North University of China, Taiyuan, Shanxi, 030051, PR China.
Environ Res. 2022 Nov;214(Pt 3):113965. doi: 10.1016/j.envres.2022.113965. Epub 2022 Aug 7.
Extraction of radionuclide contaminants from wastewater systems has recently drawn widespread attention, and then developing a novel and green extracting technology has also become an enormous challenge. Herein, a facile hydrothermal method was employed to fabricate cobalt-incorporated cryptomelane-type manganese oxide molecular sieve (Co-OMS-2) for extraction Eu(III) from wastewater under diverse experimental conditions. All kinds of characterized techniques, such as SEM, TEM, XRD, FTIR, BET, EDS and XPS had verified the qualified synthesis process and splendid structural features of the Co-OMS-2. The maximum adsorption capacity of Co-OMS-2 was 7.62 × 10 mol/g for Eu(III) at 298 K, which was superior than primarily traditional materials reported previous literatures. The high adsorption capacity of Eu(III) onto Co-OMS-2 was primarily attributed to high specific surface area and abundant surface functional groups, and the interactions were mainly contributed to strong surface complexation and electrostatic attraction. Under the condition of low pH, the outer-sphere surface complexation and cation exchange were primary mechanisms to Eu(III) adsorption onto Co-OMS-2 composites, while inner-sphere surface complexation was mainly assigned to Eu(III) adsorption onto Co-OMS-2 under the high pH sections. The Co-OMS-2 composite achieved equilibrium in a relatively short time, and this excellent performance was conducive to the treatment of Eu(III) under the extreme emergency conditions. In view of the extraordinary adsorption capacity and recycled reusability, the Co-OMS-2 composites can be as prospective adsorbents adopted for the extraction of Eu(III) in real wastewater management.
从废水系统中提取放射性核素污染物近来受到广泛关注，因此开发新型绿色提取技术也成为一项巨大的挑战。在此，采用简便的水热法制备了钴掺杂的隐钾锰矿型氧化锰分子筛（Co-OMS-2），用于在各种实验条件下从废水中萃取 Eu(III)。SEM、TEM、XRD、FTIR、BET、EDS 和 XPS 等各种表征技术验证了 Co-OMS-2 的合格合成过程和优良的结构特征。在 298 K 时，Co-OMS-2 对 Eu(III)的最大吸附容量为 7.62×10-5mol/g，优于先前文献中报道的主要传统材料。Co-OMS-2 对 Eu(III)的高吸附容量主要归因于高比表面积和丰富的表面官能团，相互作用主要归因于强表面络合和静电吸引。在低 pH 条件下，外球表面络合和阳离子交换是 Eu(III)吸附到 Co-OMS-2 复合材料上的主要机制，而在高 pH 段，内球表面络合主要归因于 Eu(III)吸附到 Co-OMS-2 上。Co-OMS-2 复合材料在较短的时间内达到平衡，这种优异的性能有利于在极端紧急情况下处理 Eu(III)。鉴于其非凡的吸附容量和可回收再利用性，Co-OMS-2 复合材料可用作从实际废水管理中萃取 Eu(III)的有前途的吸附剂。
