Zhao Fengnian, Peydayesh Mohammad, Ying Yibin, Mezzenga Raffaele, Ping Jianfeng
School of Biosystems Engineering and Food Science, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, P. R. China.
Department of Health Sciences and Technology, ETH Zurich, Zurich 8092, Switzerland.
ACS Appl Mater Interfaces. 2020 May 27;12(21):24521-24530. doi: 10.1021/acsami.0c07846. Epub 2020 May 13.
With the rapid worldwide industrial development, large amounts of pollutants such as heavy metals are discharged into the water sources, causing a huge threat to living beings. To mitigate this issue, there is an urgent need for new water treatment strategies. Inspired by a natural shell nacre structure and a multidimensional hybrid concept, we demonstrate multilayered inorganic-organic hybrid membranes using metallic molybdenum disulfide (MoS) as two-dimensional transition metal dichalcogenide nanosheets and one-dimensional silk nanofibrils for water purification. Because of its possessing negatively charged layers and interaction sites, the hybrid film could adsorb metal ions and dyes from water. The separation performance can be tuned by changing the component ratios of these two nanomaterials. During filtration, due to the reducing effect of the MoS nanosheets, precious metal ions are reduced to their nanoparticle form without any further thermal or chemical treatments. In addition to the one-step removal and recovery of metal ions, the hybrid membranes exhibit excellent potential for the determination and removal of different dyes from water. The results of this research can open up an effective and green avenue for water purification and recovery of metal ions dissolved in water.
随着全球工业的快速发展，大量污染物如重金属被排放到水源中，对生物造成了巨大威胁。为缓解这一问题，迫切需要新的水处理策略。受天然贝壳珍珠层结构和多维混合概念的启发，我们展示了一种多层无机-有机混合膜，该膜使用金属二硫化钼（MoS）作为二维过渡金属二硫属化物纳米片和一维丝素纳米纤维用于水净化。由于其具有带负电荷的层和相互作用位点，这种混合膜可以从水中吸附金属离子和染料。通过改变这两种纳米材料的组分比例可以调节分离性能。在过滤过程中，由于MoS纳米片的还原作用，贵金属离子无需任何进一步的热处理或化学处理即可还原为纳米颗粒形式。除了一步去除和回收金属离子外，这种混合膜在测定和去除水中不同染料方面也具有出色的潜力。这项研究的结果可以为水净化和回收溶解在水中的金属离子开辟一条有效且绿色的途径。
