State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering , Tongji University , Shanghai 200092 , People's Republic of China.
Shanghai Institute of Pollution Control and Ecological Security , Shanghai 200092 , People's Republic of China.
Environ Sci Technol. 2018 Dec 4;52(23):13925-13934. doi: 10.1021/acs.est.8b05409. Epub 2018 Nov 21.
Novel, efficient bioadsorbent sodium alginate/graphene/l-cysteine (SA/GR/l-Cys) beads were prepared and used for magnetic field (MF)-assisted adsorption of pollutants. SA/GR/l-Cys has excellent mechanical properties, with a breaking stress of 3.5 MPa at 79.8%, an elastic modulus of 5.0 MPa, low swelling properties (average swelling ratio <300%), and good adsorption properties toward organic pollutants and heavy metal ions. A rotating magnetic field (RMF) was shown to have a better influence than a static magnetic field (SMF) on adsorption, with enhanced adsorption capacities 5-fold greater than those of the SMF. We investigated the different adsorption mechanisms of model contaminants through Fourier transform infrared spectroscopy, ζ potential, and X-ray photoelectrons spectroscopy. Formation of new hydrogen bonds, change in ζ potential, and acceleration in chemical reactions strongly influenced the adsorption process under the RMF. In fixed-bed column adsorption, the breakthrough time for column adsorption increased, and the adsorption capacity improved by 30.66%. The costs and practical applications of SA/GR/l-Cys under RMF were also analyzed. This work demonstrated that SA/GR/l-Cys could serve as a promising adsorbent for water pollutants under RMF exposure and could be used in practical applications.
新型、高效的生物吸附剂海藻酸钠/石墨烯/半胱氨酸（SA/GR/l-Cys）珠体制备并用于磁场（MF）辅助吸附污染物。SA/GR/l-Cys 具有优异的机械性能，在 79.8%时断裂应力为 3.5MPa，弹性模量为 5.0MPa，低溶胀性能（平均溶胀率 <300%），对有机污染物和重金属离子具有良好的吸附性能。旋转磁场（RMF）比静态磁场（SMF）对吸附有更好的影响，吸附容量增加了 5 倍。我们通过傅里叶变换红外光谱、ζ 电位和 X 射线光电子能谱研究了模型污染物的不同吸附机制。新氢键的形成、ζ 电位的变化以及化学反应的加速强烈影响了 RMF 下的吸附过程。在固定床柱吸附中，柱吸附的穿透时间增加，吸附容量提高了 30.66%。还分析了 RMF 下 SA/GR/l-Cys 的成本和实际应用。这项工作表明，SA/GR/l-Cys 可以作为一种有前途的 RMF 暴露下水污染物吸附剂，并可用于实际应用。
