Department of Chemical Engineering, COMSATS University Islamabad (CUI), Lahore Campus, Defense Road, Off Raiwind Road, Lahore, Pakistan.
State Key Laboratory of Chemical Engineering, Department of Chemical Engineering and Biological Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China.
Environ Sci Pollut Res Int. 2019 Dec;26(35):35913-35923. doi: 10.1007/s11356-019-06698-3. Epub 2019 Nov 9.
Mixed matrix membranes (MMMs) provide a unique pathway to treat hazardous industrial effluents. MMMs containing zeolitic imidazolate framework-8 (ZIF-8) as filler in polydimethoxysilane (PDMS) matrix were synthesized. ZIF-8 was prepared using a modified recipe and characterized by different techniques to evaluate its morphology, thermal stability, surface area, pore volume, and other characteristics. The performance of membranes was evaluated for their application in industrial dye-stuff wastewater treatment and solvent-resistant nanofiltration. The results demonstrated that increase in the percentage of ZIF-8 loading in PDMS led to simultaneous increase in the solvent permeability as well as solute rejection from wastewater. The permeability of MMMs increased up to 32% as compared with neat PDMS membrane. The organic dye rejection was achieved more than 87% with MMMs incorporated with 20% loading of nanofillers. Rejection of MMMs was 22% higher than that of unfilled PDMS membrane due to the effect of reduced polymer swelling and size exclusion of the nanofillers. Membrane swelling tests with toluene and isopropanol demonstrated that nanofiller amount has inverse relation with membrane swelling, which implied that nanofillers were in good interaction with polymer and allowed defect free membranes with higher solute rejections and reduced membrane swelling.
杂化基质膜（MMMs）为处理危险工业废水提供了一条独特的途径。在聚二甲基硅氧烷（PDMS）基质中包含沸石咪唑酯骨架-8（ZIF-8）作为填充剂的 MMMs 被合成。ZIF-8 通过改良的配方制备，并通过不同的技术进行了表征，以评估其形态、热稳定性、比表面积、孔体积和其他特性。通过评估它们在工业染料废水处理和耐溶剂纳滤中的应用，对膜的性能进行了评估。结果表明，PDMS 中 ZIF-8 负载百分比的增加导致溶剂透过率和废水中溶质截留率的同时增加。与纯 PDMS 膜相比，MMMs 的渗透性能提高了 32%。用 20%负载量的纳米填料制备的 MMMs 对有机染料的截留率超过 87%。由于聚合物溶胀减少和纳米填料的尺寸排除效应，MMMs 的截留率比未填充的 PDMS 膜高 22%。甲苯和异丙醇的膜溶胀试验表明，纳米填料的数量与膜溶胀呈反比关系，这意味着纳米填料与聚合物有良好的相互作用，允许形成无缺陷的膜，具有更高的溶质截留率和降低的膜溶胀。
