Phosphate removal using surface enriched hematite and tetra-n-butylammonium bromide incorporated polyacrylonitrile composite nanofibers
Phosphate removal using surface enriched hematite and tetra-n-butylammonium bromide incorporated polyacrylonitrile composite nanofibers
复制标题
使用表面富集赤铁矿和四正丁基溴化铵掺入聚丙烯腈复合纳米纤维去除磷酸盐
DOI：
10.1016/j.scitotenv.2021.145364
复制
发表时间：
2021
影响因子：
9.8
通讯作者：
Nosang V. Myung
中科院分区：
文献类型：
--
作者：
Chengshuang Wang;Sooyoun Yu;David M. Cwiertny;Yadong Yin;Nosang V. Myung
纳米氧化铁基吸附剂已被广泛应用于缓解水体富营养化。针对纳米氧化铁基吸附剂稳定性差、分离回收困难等问题，系统地合成了直径可控(即66~305 nm)、组成可控的纳米复合纤维聚丙烯腈(PAN/Fe2O_3/TBAB)作为水中除磷的吸附剂。在电纺过程中，极性的TBAB表面活性剂促进了Fe2O_3纳米颗粒向纳米纤维表面的迁移，从而使Fe2O_3纳米颗粒/TBAB纳米颗粒对纳米纤维进行了表面强化。将合成的纳米纤维膜用于除磷，研究了其吸附动力学、吸附机理和重复使用性能。数据表明，吸附动力学符合准二级模型，吸附机理符合朗缪尔模型。在酸性和近中性的pH值条件下，α-Fe2O3纳米粒子对磷的去除主要来源于表面富集型纳米粒子的化学吸附，少量的阴离子交换对脱磷有一定的贡献。最大除磷能力约为。在pH=3时为8.76 mg/g(即23.1 mg/g，P/活性物质)。此外，合成的纳米纤维膜还具有良好的重复使用性能。
The nanosized iron oxides-based adsorbent has been widely used to alleviate water eutrophication. However, it is challenging to industrialize the application of nanosized iron oxides-based adsorbent due to their poor stability, difficult separation and recovery.Herein, hematite and tetra-n-butylammonium bromide incorporated polyacrylonitrile (PAN/Fe2O3/TBAB) composite nanofibers with a controlled diameter (i.e., 66 to 305 nm) and composition were systematically synthesized as an adsorbent for phosphate removal from water using surfactant-mediated electrospinning. During the electrospinning process, polar TBAB surfactant enhanced the migration of Fe2O3nanoparticles toward the surface of nanofibers resulting in Fe2O3nanoparticles/TBAB surface enriched nanofibers. The synthesized nanofiber membranes were used for phosphate removal, and their adsorption kinetics, adsorption mechanism, and reusability were investigated. Data showed that adsorption kinetic followed the pseudo-second-order model whereas the adsorption mechanism follows the Langmuir model. The phosphate removal was mainly derived from the chemisorption of surface-enriched α-Fe2O3nanoparticles at acidic and circumneutral pH values, with a small contribution from anion exchange at TBAB sites. The maximum phosphate removal capacity was approx. 8.76 mg/g (i.e.,23.1 mg/g, P/active materials) at pH 3. Additionally, the synthesized nanofiber membrane also shows excellent reusability.