Separation and Purification Technology ( IF 8.1 ) Pub Date : 2022-11-11 , DOI: 10.1016/j.seppur.2022.122613 Dipeshkumar D. Kachhadiya , Z.V.P. Murthy
In the present work, polyvinylidenefluroide (PVDF) mixed matrix membranes (MMMs) membranes are synthesized for selective separation of n-butanol from an aqueous mixture through organophilic pervaporation (PV). Hydrophobic MIL-101(Cr) surface-modified with TiO2 and h-BN nanoparticles (NPs) are incorporated into the PVDF membrane. The prepared nanocomposites and MMMs are characterized by various analytical techniques: FESEM, AFM, HRTEM with SAED pattern, PXRD, FTIR, XPS, TGA, porosity and water contact angle measurements. The prepared MMMs are applied to recover the 1.5 wt% n-butanol/water mixture. The hydrophobic nature of MIL-101(Cr) enhances the adsorption selectivity for butanol, resulting in enhanced butanol flux and selectivity. Experimental data show that the total flux and selectivity boost with increased feed composition and temperature. The modified membranes show enhancement in total flux and selectivity by 19.03 % and 63.25 % (A2), 80.03 % and 284.72 % (A3), and 90.99 % and 145.13 % (A4), respectively. Incorporating h-BN NPs into the MIL-101(Cr) increases the affinity for water molecules to pass through membranes, reducing the butanol selectivity of the membranes. From the experimental data, it can be concluded that adding hydrophilic nanoparticles such as TiO2 and h-BN into the MIL-101(Cr) enhances each membranes total flux and separation factor. The significant separation results are found for A3 membrane with total flux of 3139.21 g m−2 h−1 and separation factor of 95.04. Also, the A3 membrane shows good long term performance stability of 160 h. Overall, good physiochemical characteristics and separation performance show the practical applicability of the butanol separation for the prepared membranes.
中文翻译:
使用 TiO2 和 h-BN 功能化 MIL-101(Cr) 掺入 PVDF 混合基质膜从水性混合物中分离正丁醇
在目前的工作中,合成了聚偏二氟乙烯 (PVDF) 混合基质膜 (MMM) 膜,用于通过亲有机渗透蒸发 (PV) 从水性混合物中选择性分离正丁醇。使用 TiO 2进行表面改性的疏水性 MIL-101(Cr)和 h-BN 纳米粒子 (NPs) 被掺入 PVDF 膜中。制备的纳米复合材料和 MMM 通过各种分析技术进行表征:FESEM、AFM、具有 SAED 图案的 HRTEM、PXRD、FTIR、XPS、TGA、孔隙率和水接触角测量。制备的 MMM 用于回收 1.5 wt% 的正丁醇/水混合物。MIL-101(Cr) 的疏水性增强了对丁醇的吸附选择性,从而提高了丁醇通量和选择性。实验数据表明,总通量和选择性随着进料组成和温度的增加而提高。改性膜的总通量和选择性分别提高了 19.03% 和 63.25% (A2)、80.03% 和 284.72% (A3) 以及 90.99% 和 145.13% (A4)。将 h-BN NPs 掺入 MIL-101(Cr) 会增加水分子穿过膜的亲和力,从而降低膜的丁醇选择性。从实验数据可以得出结论,添加亲水性纳米粒子如 TiO2和 h-BN 进入 MIL-101(Cr) 提高了每个膜的总通量和分离因子。A3 膜具有显着的分离结果,总通量为 3139.21 g m -2 h -1,分离因子为 95.04。此外,A3 膜显示出 160 小时的良好长期性能稳定性。总的来说,良好的理化特性和分离性能表明制备的膜在丁醇分离方面具有实际适用性。