Talluri Vssl Prasad, Tleuova Aiym, Hosseini Seyedmehdi, Vopicka Ondrej
Department of Biotechnology, University of Chemistry and Technology, Technicka 5, 166 28 Prague, Czech Republic.
Chemical Engineering Department, University of Chemistry and Technology, Technická 5, 166 28 Praha 6, Czech Republic.
Membranes (Basel). 2020 Mar 26;10(4):55. doi: 10.3390/membranes10040055.
In this work, a poly(1-trimethylsilyl-1-propyne) (PTMSP) mixed-matrix membrane was fabricated for the selective removal of 1-butanol from aqueous solutions through pervaporation. Silica nanoparticles (SNPs), which were surface-modified with surfactant hexadecyltrimethylammonium bromide (CTAB), were incorporated into the structure of the membrane. The modified membrane was characterized by thermogravimetry-differential scanning calorimetry (TG-DSC), contact angle measurements, and scanning electron microscope (SEM) analysis. It was found that the surface hydrophobicity of the membrane was improved when compared to neat PTMSP by contact angle measurement. It was confirmed by SEM analysis that a uniform distribution of surface-modified SNPs throughout the PTMSP membrane was achieved. The thermogravimetric analysis detected the thermal degradation of the modified PTMSP at 370 °C, which is comparable to neat PTMSP. The pervaporation measurements showed a maximum separation factor of 126 at 63 °C for 1.5 w/w% 1-butanol in the feed. The maximum total flux of approximately 1.74 mg·cm·min was observed with the highest inspected temperature of 63 °C and at the 1-butanol concentration in the feed 4.5 w/w%. The pervaporation transients showed that the addition of the surface-modified SNPs significantly enhanced the diffusivity of 1-butanol in the composite compared to the neat PTMSP membrane. This improvement was attributed to the influence of the well-dispersed SNPs in the PTMSP matrix, which introduced an additional path for diffusivity.
在本研究中，制备了一种聚（1-三甲基硅基-1-丙炔）（PTMSP）混合基质膜，用于通过渗透蒸发从水溶液中选择性去除正丁醇。将用表面活性剂十六烷基三甲基溴化铵（CTAB）进行表面改性的二氧化硅纳米颗粒（SNP）掺入膜结构中。通过热重-差示扫描量热法（TG-DSC）、接触角测量和扫描电子显微镜（SEM）分析对改性膜进行了表征。通过接触角测量发现，与纯PTMSP相比，该膜的表面疏水性得到了改善。SEM分析证实，表面改性的SNP在整个PTMSP膜中实现了均匀分布。热重分析检测到改性PTMSP在370℃时发生热降解，这与纯PTMSP相当。渗透蒸发测量结果表明，在进料中正丁醇含量为1.5 w/w%时，63℃下的最大分离因子为126。在最高检测温度63℃和进料中正丁醇浓度为4.5 w/w%时，观察到最大总通量约为1.74 mg·cm⁻²·min⁻¹。渗透蒸发瞬态表明，与纯PTMSP膜相比，添加表面改性的SNP显著提高了正丁醇在复合材料中的扩散率。这种改善归因于PTMSP基质中分散良好的SNP的影响，其引入了额外的扩散路径。
