State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China.
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China.
Chemosphere. 2021 Dec;284:131284. doi: 10.1016/j.chemosphere.2021.131284. Epub 2021 Jun 24.
Improving the adsorption performance with simple and strong applicability has always been a research hotspot in water treatment. This study introduces sodium alginate/MXene/CoFeO (SA/MX/CFO) as functional composite materials by sodium alginate cross-linking and as adsorbents in the removal of contaminations with an external magnetic field (MF). SA/MX/CFO beads exhibited excellent mechanical properties, with fracture stress of 1.64 MPa at 73.4%, and an elastic modulus of 2.23 MPa. The isotherm fitting chose Cu and CIP as the model pollutants, the isotherm fitting shows that the adsorption capacity of CIP is significantly improved by 24.2%.The magnetic effect of the adsorption capacity of Cu is not obvious, which indicated the selectivity for adsorption; however, the adsorption rates of CIP and Cu are greatly improved by 359.76% and 371% respectively. Promoting materials transfer rate, changing of hydrogen bond, and surface functional group reactivity is the key to determine the adsorption enhancement with a rotating magnetic field (RMF). The combination of the external magnetic field and the inherent magnetic properties of the adsorbent can adjust the adsorption process and the selectivity of pollutants. It also provides an innovative and practical method for MF to remediate contaminants in the magnetically enhanced adsorption system.
提高吸附性能，具有简单而强大的适用性，一直是水处理领域的研究热点。本研究通过海藻酸钠交联，将海藻酸钠/二维 MXene/CoFeO（SA/MX/CFO）作为功能复合材料，作为在外加磁场（MF）下去除污染物的吸附剂。SA/MX/CFO 珠粒表现出优异的机械性能，断裂应力在 73.4%时达到 1.64 MPa，弹性模量为 2.23 MPa。等温拟合选择 Cu 和 CIP 作为模型污染物，等温拟合表明 CIP 的吸附容量显著提高了 24.2%。Cu 的吸附容量的磁效应不明显，表明了对吸附的选择性；然而，CIP 和 Cu 的吸附速率分别提高了 359.76%和 371%。促进材料传质、氢键变化和表面官能团反应性是决定旋转磁场（RMF）吸附增强的关键。外加磁场和吸附剂固有磁性的结合可以调节吸附过程和污染物的选择性。它还为 MF 在磁增强吸附系统中修复污染物提供了一种创新实用的方法。
