Li Xiaohong, Chen Ying, Chen Yong, Chen Dong, Wang Quan, Wang Yan
College of Petrochemical Engineering and Environment, Zhejiang Ocean University, No. 1, Haida South Road, Dinghai District, Zhoushan, Zhejiang 316022, P. R. China.
United National-Local Engineering Laboratory of Harbor Oil and Gas Storage and Transportation Technology, No. 1, Haida South Road, Dinghai District, Zhoushan, Zhejiang 316000, P. R. China.
ACS Omega. 2022 Aug 16;7(34):30184-30196. doi: 10.1021/acsomega.2c03298. eCollection 2022 Aug 30.
Superhydrophilic and underwater superoleophobic cotton fabric (named CS-CF-PDA, or m-CF) was prepared by modifying the cotton fabric (CF) with dopamine (DA) and chitosan (CS). The oil-water separation and heavy-metal ion (e.g., Cu(II)) adsorption performances of m-CF were investigated, and m-CF was characterized by field emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS), Fourier transform infrared (FT-IR), and thermogravimetric analysis (TGA). The results showed that the underwater oil contact angle (UWOCA) of m-CF was more than 156°. The m-CF was used to treat artificial oily wastewater containing Cu(II) under room temperature and atmospheric pressure and gravity, by which the separation efficiency, water flux, and Cu(II) removal rate could reach 99%, 17 400 L·m·h, and 89%, respectively. Additionally, in the process of continuous treatment of oily wastewater, the water flux slightly decreased; on the contrary, the Cu(II) removal rate decreased significantly to 67% within 120 s. Cu(II) was one of the reasons for the decrease of water flux. The m-CF of adsorbed Cu(II) could be leached with HCl (0.1 mol·L) solution, and the Cu(II) desorption rate could reach over 95% within 120 s. After strong acid, strong alkali, high salt, and abrasion treatment, the UWOCAs of m-CF were still higher than 150°. In a word, in terms of oil-water separation, m-CF exhibited good acid, alkali, salt, and abrasion resistances. Also, it is an underwater superoleophobic material involving simple preparation, low cost, and environmental friendliness, which could remove the floating oil and heavy-metal ions from wastewater and has good industrial application prospects.
通过用多巴胺（DA）和壳聚糖（CS）对棉织物（CF）进行改性，制备了超亲水和水下超疏油棉织物（命名为CS-CF-PDA，或m-CF）。研究了m-CF的油水分离和重金属离子（如Cu(II)）吸附性能，并用场发射扫描电子显微镜（FE-SEM）、能谱分析（EDS）、傅里叶变换红外光谱（FT-IR）和热重分析（TGA）对m-CF进行了表征。结果表明，m-CF的水下油接触角（UWOCA）大于156°。m-CF在室温、常压和重力条件下用于处理含Cu(II)的人工含油废水，其分离效率、水通量和Cu(II)去除率分别可达99%、17400 L·m⁻²·h⁻¹和89%。此外，在连续处理含油废水的过程中，水通量略有下降；相反，Cu(II)去除率在120 s内显著下降至67%。Cu(II)是水通量下降的原因之一。吸附有Cu(II)的m-CF可用HCl（0.1 mol·L⁻¹）溶液浸出，Cu(II)解吸率在120 s内可达95%以上。经过强酸、强碱、高盐和磨损处理后，m-CF的UWOCA仍高于150°。总之，在油水分离方面，m-CF表现出良好的耐酸、碱、盐和耐磨性。此外，它是一种水下超疏油材料，制备简单、成本低且环境友好，可去除废水中的浮油和重金属离子，具有良好的工业应用前景。
