Department of Chemistry, Graphic Era Deemed to be University, Dehradun, India E-mail:
Department of Environmental Science, Graphic Era Deemed to be University, Dehradun, India; Department of Environmental Science, Graphic Hill University, Dehradun, India.
Water Sci Technol. 2021 Nov;84(10-11):2830-2841. doi: 10.2166/wst.2021.266.
Superhydrophobic-superoleophilic fabrics were prepared and evaluated for oil-water mixture separation efficiencies. The nano-TiO and nano-SiO based coatings were done on the surface of the cotton fabric to create nanoscale roughness over the surface which was further modified by low energy material 1, 1, 3, 3-Hexamethyldisilazane (HMDS) and, polydimethylsiloxane (PDMS). Particle size and stability of prepared sol were characterized by particle size analysis and zeta potential. Coated cotton fabric samples were characterized by contact angle, contact angle hesteresis and surface free energy for its hydrophobic nature. Surface morphology was studied by scanning electron microscopy (SEM). The coated fabrics were found to be hydrophobic with low surface free energy values. The maximum contact angle was found to be 133° and lowest contact angle hysteresis was 5°. SEM confirmed the appearance of nanoscale surface roughness after coating of sols on cotton fabric. The average particle size and zeta potential values of silica sol was 61 nm and 137 mv whereas for titania sol it was found 344 nm and 200 mv, respectively. The oil-water separation efficiency of coated fabric was also observed by a different oil-water mixture. The coatings were found to be hydrophobic in nature and seem to be very useful for oil-water mixture separation.
超疏水-超亲油织物已被制备并用于评估油水混合物的分离效率。在棉织物表面进行基于纳米 TiO 和纳米 SiO 的涂层，以在表面上创建纳米级粗糙度，然后通过低能材料 1,1,3,3-六甲基二硅氮烷 (HMDS) 和聚二甲基硅氧烷 (PDMS) 进一步进行改性。通过粒径分析和 ζ 电位对制备的溶胶的粒径和稳定性进行了表征。通过接触角、接触角滞后和表面自由能对涂覆棉织物样品的疏水性进行了表征。通过扫描电子显微镜 (SEM) 研究了表面形态。涂覆的织物具有疏水性，表面自由能值较低。最大接触角为 133°，最低接触角滞后为 5°。SEM 证实了溶胶涂覆在棉织物上后出现了纳米级表面粗糙度。硅溶胶的平均粒径和 ζ 电位值分别为 61nm 和 137mv，而钛溶胶分别为 344nm 和 200mv。通过不同的油水混合物也观察到了涂覆织物的油水分离效率。涂层具有疏水性，似乎非常适用于油水混合物的分离。
