As industrial oily wastewater can seriously damage ecosystems, the use of filtration technology with functional filters has emerged as an effective approach for purifying oily wastewater and protecting the environment. Although several methods for preparing functional filters with specific wettability have been reported, most methods are complicated, expensive, and time-consuming. Furthermore, these methods are only applicable to specific substrates, which hinder their practical applications. Here, a simple and versatile method for the fabrication of a superhydrophilic filter on any substrate using a one-step dipping process is reported. The method is easily scaled-up to fabricate large-area superhydrophilic filters; moreover, mass production is possible using a roll-to-roll process. The resulting filter is durable, stable, and, due to its stable hydrophilic layer, shows no deterioration in wetting behavior; it also exhibits self-cleaning properties. Based on its selective wetting characteristics, oil/water mixtures and oil-in-water emulsions stabilized by surfactants can be purified in a highly efficient manner. Importantly, owing to its self-cleaning properties, the filter can be reused after simply immersing and washing in water. This easy, cost-effective, fast, and versatile method for fabricating superhydrophilic filters can be practically applied in industries that need to purify oily water.

中文翻译：

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一步一步制造超亲水过滤器，可有效纯化含油水

由于工业含油废水会严重破坏生态系统，因此使用具有功能性过滤器的过滤技术已成为净化含油废水和保护环境的有效方法。尽管已经报道了几种制备具有特定润湿性的功能性过滤器的方法，但是大多数方法都是复杂，昂贵和费时的。此外，这些方法仅适用于特定的基材，这阻碍了它们的实际应用。在此，报道了一种使用一步浸渍工艺在任何基材上制造超亲水性过滤器的简单通用的方法。该方法易于按比例放大以制造大面积超亲水性过滤器。此外，可以使用卷对卷工艺进行批量生产。由此产生的过滤器是耐用，稳定的，并且 由于其稳定的亲水层，润湿性能不会降低；它还具有自清洁性能。基于其选择性的润湿特性，可以以高效方式纯化由表面活性剂稳定的油/水混合物和水包油乳液。重要的是，由于其自​​洁特性，只需将其浸入水中并清洗后即可重复使用。这种简单，经济，快速，通用的超亲水性过滤器制造方法可实际用于需要净化含油水的行业。重要的是，由于其自​​洁特性，只需将其浸入水中并清洗后即可重复使用。这种简单，经济，快速，通用的超亲水性过滤器制造方法可实际用于需要净化含油水的行业。重要的是，由于其自​​洁特性，只需将其浸入水中并清洗后即可重复使用。这种简单，经济，快速，通用的超亲水性过滤器制造方法可实际用于需要净化含油水的行业。