Wang Hui, Zhao Qi, Zhang Kuikui, Wang Futao, Zhi Jinfang, Shan Chong-Xin
Henan Key Laboratory of Diamond Optoelectronic Materials and Devices, Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, P. R. China.
Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
Langmuir. 2022 Sep 20;38(37):11304-11313. doi: 10.1021/acs.langmuir.2c01480. Epub 2022 Sep 7.
Fabrication of absorbent materials foroil/water separation is an important ecological pursuit for oil spill clean-up and organic pollutants' removal. In this study, nanodiamonds (NDs), a promising member of the carbon family, were functionally modified by the covalent linking of octadecylamine (ODA). Subsequently, the superhydrophobic sponge with hierarchical microstructures was fabricated by embedding ND-ODA into a melamine sponge (MS) skeleton via a simple immersion-drying process. The as-prepared sponge (ND-ODA@PDMS@MS) showed superhydrophobic properties with a water contact angle of 155 ± 2°. For various oils and organic solvents, ND-ODA@PDMS@MS possesses excellent absorption capacity (26.65-55.64 g/g) and oil/water separation efficiency (above 98.6%). Furthermore, the adsorption capacity to crude oil remained relatively stable in highly acidic, alkaline, and salty conditions, ensuring the application in the clean-up of industrial oily sewages and marine oil spills. Besides absorbing oil for a single time, ND-ODA@PDMS@MS also exhibited satisfactory performance in continuous oil/water separation. Therefore, this work provides a facile strategy to produce robust and efficient absorbent materials for oil/water separation in large-scale oil and organic solvent clean-ups.
制备用于油水分离的吸收材料是溢油清理和有机污染物去除的一项重要生态追求。在本研究中，碳家族中有前景的成员纳米金刚石（NDs）通过十八烷基胺（ODA）的共价连接进行功能改性。随后，通过简单的浸渍干燥工艺将ND-ODA嵌入三聚氰胺海绵（MS）骨架中，制备出具有分级微结构的超疏水海绵。所制备的海绵（ND-ODA@PDMS@MS）表现出超疏水性能，水接触角为155±2°。对于各种油类和有机溶剂，ND-ODA@PDMS@MS具有优异的吸收容量（26.65-55.64 g/g）和油水分离效率（高于98.6%）。此外，在高酸性、碱性和含盐条件下，其对原油的吸附容量保持相对稳定，确保了在工业含油污水清理和海洋溢油清理中的应用。除了单次吸油外，ND-ODA@PDMS@MS在连续油水分离中也表现出令人满意的性能。因此，这项工作为大规模油类和有机溶剂清理中生产坚固且高效的油水分离吸收材料提供了一种简便策略。
