Chongqing Key Laboratory of Soft-Matter Material Chemistry and Function Manufacturing, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China.
Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing Technology and Business University, Beijing 100048, China.
Int J Biol Macromol. 2019 Nov 1;140:1175-1182. doi: 10.1016/j.ijbiomac.2019.08.216. Epub 2019 Aug 26.
Traditional superhydrophobic cotton fabrics (SCFs) for oil/water separation were usually fabricated by surface coating with inorganic nanoparticles combined with nonrenewable and nonbiodegradable or even toxic fossil-based chemicals, which would lead to secondary environmental pollution after their lifetime. In this study, we report robust, nanoparticle-free, fluorine-free SFC, which was prepared by acid etching followed by surface coating with epoxidized soybean oil resin (CESO) and subsequent modification with stearic acid (STA). No toxic compound and no nanoparticle were included within the SCF and all the raw materials including cotton fabric, CESO and STA are biodegradable and derived from biological resources. The SCF showed excellent mechanical stability and chemical/environmental resistances. The superhydrophobicity of the SFC survived from mechanical abrasion, tape peeling, ultrasonication, solvent erosion and low/high temperature exposure. The SCF also exhibited good acid/alkali resistance with contact angle over 150° toward different pH water droplets. Moreover, the SCF could efficiently separate oil/water mixtures with efficiency above 97.9% and the superhydrophobicity remained after reusing for at least 10 times. The fully biological-derived SCF with excellent mechanical and chemical resistances exhibit great potential for separation of oil/water mixtures.
传统的用于油水分离的超疏水棉织物（SCF）通常是通过用无机纳米粒子进行表面涂覆，并结合不可再生、不可生物降解甚至有毒的化石基化学品来制备的，这些化学品在其使用寿命结束后会导致二次环境污染。在本研究中，我们报告了一种稳健的、无纳米粒子的、无氟的 SCF，它是通过酸刻蚀，然后用环氧化大豆油树脂（CESO）进行表面涂覆，再用硬脂酸（STA）进行修饰而制备的。SCF 中不包含有毒化合物和纳米粒子，所有的原材料，包括棉织物、CESO 和 STA，都是可生物降解的，并且来源于生物资源。SCF 表现出优异的机械稳定性和耐化学/环境性。SCF 的超疏水性能够经受机械磨损、胶带剥离、超声处理、溶剂侵蚀和高低温暴露。该 SCF 还表现出良好的耐酸碱性能，对不同 pH 值的水滴的接触角超过 150°。此外，SCF 可以有效地分离油水混合物，效率超过 97.9%，并且在至少重复使用 10 次后仍保持超疏水性。这种完全生物衍生的 SCF 具有优异的机械和化学抗性，在油水混合物的分离方面具有很大的潜力。
