Abstract The sustainable development of modern industry and the frequent emergence of marine oil spills have caused a significant and far-reaching impact on water resources, prompting individuals to develop an advanced technology or material for the solution of oily wastewater. Therefore, a functionalized material herein has been successfully fabricated by decorating cotton surface with photocatalytic titanium dioxide (TiO2) nanoparticles and chemical components containing pH-sensitive carboxyl groups through a simple, green and cost-effective approach. By combining the nano-roughness structure of the surface with the suitable surface components, endowing the as-obtained cotton with the splendid properties of adjustable surface wettability, photocatalytic degradation and durability. Based on the tunable wettability of the resulted cotton, it can intelligently separate two forms of oil/water mixtures involving stratified oil-water mixtures and surfactant-stabilized emulsions with prominent separation efficiency. Simultaneously, by virtue of the resultant superwettable cotton, the high-speed and high-efficiency in-situ purification of oily wastewater driven by negative pressure is successfully realized. More interestingly, benefitting from the photocatalytic property of TiO2, this resulting cotton can be also exploited for degrading water-soluble dyes to achieve water purification. In light of the unique predominance of the above-mentioned modified cotton, this newly developed economical strategy can promote the extensive development of multipurpose superwetting materials, providing tempting potential for the treatment of intricate oily wastewater.

中文翻译：

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轻松制备具有可调超润湿性的 TiO2 功能化材料，用于连续可控的油/水分离、乳化油净化和有害有机物光降解

摘要 现代工业的可持续发展和海洋溢油事故的频发，对水资源产生了重大而深远的影响，促使人们开发解决含油废水的先进技术或材料。因此，本文通过简单、绿色和具有成本效益的方法，通过用光催化二氧化钛 (TiO2) 纳米粒子和含有 pH 敏感羧基的化学成分装饰棉花表面，成功制备了一种功能化材料。通过将表面的纳米粗糙度结构与合适的表面成分相结合，使所获得的棉花具有可调节的表面润湿性、光催化降解和耐久性的优异性能。基于所得棉花的可调节润湿性，它可以智能地分离两种形式的油水混合物，包括分层油水混合物和表面活性剂稳定的乳液，具有突出的分离效率。同时，利用得到的超润湿棉，成功实现了负压驱动含油废水的高速高效原位净化。更有趣的是，受益于二氧化钛的光催化特性，这种棉花也可用于降解水溶性染料以实现水净化。鉴于上述改性棉的独特优势，这种新开发的经济策略可以促进多用途超润湿材料的广泛发展，为处理复杂的含油废水提供诱人的潜力。