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Impacts of Sulfuric Acid on the Stability and Separation Performance of Polymeric PVDF-Based Membranes at Mild and High Concentrations: An Experimental Study

机译:硫酸对温和高浓度聚合物PVDF基膜稳定性和分离性能的影响:实验研究

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摘要

This study investigated the effects of an aqueous acidic solution at typical concentrations on polymeric polyvinylidene fluoride (PVDF)-based membranes. Flat-sheet PVDF-based membranes were completely embedded in sulfuric acid at varying concentrations. The effect of the acid concentration after a prolonged exposure time on the chemical, mechanical and physical properties of the membrane were checked via FE-SEM, EDX (Energy-Dispersive Spectrometer), FTIR, XRD, tensile strength, zeta potential, contact angle, porosity, pure water flux measurement and visual observation. The result reveals prompt initiation of reaction between the PVDF membrane and sulfuric acid, even at a mild concentration. As the exposure time extends with increasing concentration, the change in chemical and mechanical properties become more pronounced, especially in the morphology, although this was not really noticeable in either the crystalline phase or the functional group analyses. The ultimate mechanical strength decreased from 46.18 ± 0.65 to 32.39 ± 0.22 MPa, while the hydrophilicity was enhanced due to enlargement of the pores. The flux at the highest concentration and exposure period increased by 2.3 times that of the neat membrane, while the BSA (Bovine Serum Albumin) rejection dropped by 55%. Similar to in an alkaline environment, the stability and performance of the PVDF-based membrane analyzed in this study manifested general deterioration.
机译:本研究研究了酸性酸性水溶液在聚合物聚偏二氟乙烯(PVDF)基膜上的典型浓度的影响。基于平板PVDF的膜完全嵌入硫酸中以不同的浓度。通过Fe-SEM,EDX(能量分散光谱仪),FTIR,XRD,拉伸强度,Zeta电位,接触角检查膜对膜的化学,机械和物理性质延长的曝光时间后的酸浓度在膜的延长曝光时间后的影响。孔隙度,纯净的水通量测量和视觉观察。结果表明,即使以轻度浓度,均匀地在PVDF膜和硫酸之间的反应引发。随着浓度越来越延长的曝光时间,化学和机械性能的变化变得更加明显,特别是在形态中,尽管在结晶相或官能团分析中并不是真正显着的。最终的机械强度从46.18±0.65降至32.39±0.22MPa,而由于孔的扩大,亲水性提高。最高浓度和暴露期的通量增加了整齐膜的2.3倍,而BSA(牛血清白蛋白)排斥率下降了55%。与碱性环境相似,本研究中分析的基于PVDF的膜的稳定性和性能表现出一般恶化。

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