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Developing polysulfone-based mixed matrix membrane containing hydrazone-linked covalent organic frameworks towards dye wastewater purification
Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2022-06-09 , DOI: 10.1016/j.cej.2022.137456
Nazanin Mokhtari, Mohammad Dinari, Hossein Fashandi

The shortage of water resources and the increased demand for clean water warrant focused investigations on wastewater treatment. In this regard, mixed matrix membranes (MMMs) have been introduced as economic and efficient tools for removing contaminants from wastewater. The current study deals with the synthesis of a hydrazone-linked covalent organic framework (Hz-TFPTZ-COF) and its incorporation into polysulfone (PSf)/ poly N-vinylpyrrolidone (PVP) matrix to obtain Hz-TFPTZ@PSf/PVP MMM containing different concentrations of Hz-TFPTZ-COF (0-1 wt.%). The synthesized Hz-TFPTZ-COF and the prepared MMMs were fully characterized using various analytical techniques. The negative surface charge of Hz-TFPTZ-COF made it a good candidate for removing cationic dyes. Moreover, the effect of Hz-TFPTZ-COF loading on the mechanical properties, porosity, pure water permeability (PWP), and dye rejection of the prepared MMMs was investigated. Hz-TFPTZ-COF concentration as low as 1.0 wt.% in the MMM formulation yielded a PWP as high as 94.69 L. m−2. h−1. bar-1 and dye rejection of 92% and 88% for Basic Blue 41 and Methyl Violet, respectively. In addition, the tensile strength of the prepared MMMs was increased from 2.26 to 3.43 MPa. Overall, incorporating the Hz-TFPTZ-COF into PSf/PVP polymeric matrix affords a MMM with superior performance in the purification of cationic dye wastewater.



中文翻译:

开发含有腙连接的共价有机骨架的聚砜基混合基质膜用于染料废水净化

水资源短缺和对清洁水的需求增加,需要对废水处理进行重点调查。在这方面,已引入混合基质膜 (MMM) 作为从废水中去除污染物的经济且有效的工具。目前的研究涉及腙连接的共价有机骨架 (Hz-TFPTZ-COF) 的合成及其与聚砜 (PSf)/聚N-乙烯基吡咯烷酮 (PVP) 基质以获得含有不同浓度 Hz-TFPTZ-COF (0-1 wt.%) 的 Hz-TFPTZ@PSf/PVP MMM。使用各种分析技术对合成的 Hz-TFPTZ-COF 和制备的 MMM 进行了充分表征。Hz-TFPTZ-COF 的负表面电荷使其成为去除阳离子染料的良好候选者。此外,还研究了加载 Hz-TFPTZ-COF 对制备的 MMMs 的机械性能、孔隙率、纯水渗透率 (PWP) 和染料排斥率的影响。MMM 配方中低至 1.0 wt.% 的 Hz-TFPTZ-COF 浓度产生高达 94.69 L. m -2的 PWP 。h -1。酒吧-1碱性蓝 41 和甲基紫的染料抑制率分别为 92% 和 88%。此外,制备的 MMM 的抗拉强度从 2.26 MPa 增加到 3.43 MPa。总体而言,将 Hz-TFPTZ-COF 结合到 PSf/PVP 聚合物基质中可提供在阳离子染料废水净化方面具有卓越性能的 MMM。

更新日期:2022-06-10
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