Organic and Optoelectronic Materials Laboratory, Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University, Daejeon, 34134, South Korea.
Organic and Optoelectronic Materials Laboratory, Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University, Daejeon, 34134, South Korea.
Chemosphere. 2020 Nov;259:127391. doi: 10.1016/j.chemosphere.2020.127391. Epub 2020 Jun 16.
Sodium dodecylbenzenesulfonate (SDBS) is commonly used to remove radioactive nuclides such as Cs ions during decontamination of shut-down nuclear power plants. Potential environmental problems still remain because of the incomplete removal of large amounts of SDBS from radioactive liquid waste. For the first time, mesoporous silica nanofibers (MSFs) were fabricated for an efficient SDBS separation. MSFs were prepared by electrospinning using tetraethyl orthosilicate, a surfactant, and a template polymer; the product had a large surface area, a high pore volume, and a uniform pore size distribution. The internal pores or external surface were modified with quaternary ammonium salt, providing affinity to water and an electrostatic interaction with SDBS. The MSF-based adsorbent had excellent adsorption ability for SDBS (158.98 mg/g) over conventional adsorbents. In addition, the MSF-based adsorbent could selectively adsorb SDBS from a mixed solution of SDBS and Cs ions. Judging from the Freundlich pseuso second-order kinetic adsorption, the adsorption isotherm indicated that the SDBS adsorption was a kind of multilayer physisorption.
十二烷基苯磺酸钠（SDBS）常用于去除关闭的核电站去污过程中的放射性核素如 Cs 离子。由于放射性液体废物中大量的 SDBS 没有被完全去除，仍然存在潜在的环境问题。本文首次制备了介孔硅纳米纤维（MSFs），用于高效分离 SDBS。MSFs 通过静电纺丝法使用正硅酸乙酯、表面活性剂和模板聚合物制备；产物具有大的表面积、高的孔体积和均匀的孔径分布。内部孔或外部表面用季铵盐进行改性，赋予其对水的亲和性和与 SDBS 的静电相互作用。与传统吸附剂相比，基于 MSF 的吸附剂对 SDBS 具有优异的吸附能力（158.98mg/g）。此外，基于 MSF 的吸附剂可以从 SDBS 和 Cs 离子的混合溶液中选择性地吸附 SDBS。从 Freundlich 伪二阶动力学吸附来看，吸附等温线表明 SDBS 的吸附是一种多层物理吸附。
