Abstract

Hydrophobic/oleophilic filters have great potential for application in oil/water separation. Herein, we describe the successful preparation of environment friendly superhydrophobic cellulosic fiber filter to remove water from diesel. The modified TiO₂ particles were used to fabricate the rough structure of superhydrophobic filter paper via a dip-coating method with epoxy resin as a binder. With the further dipping modification by hexadecyltrimethoxysilane (HDTMS), the filter paper obtained excellent water-resistance with water contact angle (WCA) ranging from 126.0° to 151.8°, and strong stability against acid, alkali and UV lights. In this work, it was found that the WCA was proportional to the surface roughness. The obtained hydrophobic filter papers could selectively absorb oil from water-containing fuel oil and could separate water/fuel oil mixture very efficiently with separation efficiency higher than 99%. This simple and mild strategy would inspire the large-scale fabrication of multifunctional surfaces for practical applications in water/oil separation.

摘要

疏水/亲油性过滤器在油/水分离中具有巨大的潜力。在此，我们描述了成功制备环保型超疏水纤维素纤维滤池以去除柴油中的水分的方法。改性TiO ₂使用环氧树脂作为粘合剂，通过浸涂法将这些颗粒用于制造超疏水性滤纸的粗糙结构。经过十六烷基三甲氧基硅烷（HDTMS）的进一步浸渍改性，滤纸具有出色的耐水性，水接触角（WCA）为126.0°至151.8°，并且对酸，碱和紫外线具有很强的稳定性。在这项工作中，发现WCA与表面粗糙度成正比。所获得的疏水性滤纸可以选择性地从含水燃料油中吸收油并且可以非常有效地分离水/燃料混合物，分离效率高于99％。这种简单而温和的策略将启发在水/油分离中的实际应用中大规模制造多功能表面。