Efficient removal of mercury ions with MoS2-nanosheet-decorated PVDF composite adsorption membrane.
Efficient removal of mercury ions with MoS2-nanosheet-decorated PVDF composite adsorption membrane.
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DOI：
10.1016/j.envpol.2020.115705
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发表时间：
2020-10
影响因子：
8.9
通讯作者：
Xinghua Zhao;Jing Li;Shuyong Mu;Wei He;Dan Zhang;Xia Wu;Chuanyi Wang;Hehua Zeng
中科院分区：
文献类型：
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作者：
Xinghua Zhao;Jing Li;Shuyong Mu;Wei He;Dan Zhang;Xia Wu;Chuanyi Wang;Hehua Zeng
开发一种具有高吸附性能和可回收性的新型吸附剂对含汞离子废水的处理具有重要的现实意义。在本研究中，通过将MoS2纳米片混合到PVDF聚合物基体（P-PVDF/MoS2）中，然后进行非溶剂诱导的相转化，制备了一种新型膜吸附剂。该材料能够结合汞离子，不受溶液离子强度、共存阴离子或干扰重金属离子的影响。P-PVDF/ mos2的最大吸附量为578 mg g−1。拟二级吸附动力学和Langmuir等温线模型最能描述吸附过程。吸附机制以单层化学吸附为主，其中S基团为主要活性位点。此外，该膜可以很容易地用镊子从水溶液中去除，经过10次循环后，汞离子的去除率仍保持在90%以上。该研究表明，廉价且可回收的P-PVDF/ mos2膜可用于大规模高效去除废水中的重金属离子。
The exploitation of a new adsorbent with a high adsorption performance and recyclability is of great practical significance for the treatment of wastewater containing mercury ions. In this study, a novel membrane adsorbent was fabricated by blending MoS2nanosheets into a PVDF polymer matrix (P-PVDF/MoS2) followed by non-solvent-induced phase conversion. This material was able to bind mercury ions and was not affected by the solution ionic strength, co-existing anions, or interfering heavy metal ions. The optimal pH range for mercury ion elimination was 4.5–6.0, and P-PVDF/MoS2exhibited a maximum adsorption capacity of 578 mg g−1. The pseudo-second-order adsorption kinetics and Langmuir isotherm models best described the adsorption process. The adsorption mechanism was mainly monolayer chemisorption, for which the S groups were the major active sites. Furthermore, the membrane could be removed from the aqueous solution easily using tweezers, and the removal efficiency of mercury ions remained over 90% after ten cycles. This study suggests that the inexpensive and recyclable P-PVDF/MoS2membranes can be used for the efficient removal of heavy metal ions from wastewater at a large scale.