Abdelhafeez Islam A, Zhou Xuefei, Yao Quifang, Yu Zhenjiang, Gong Yufeng, Chen Jiabin
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, P. R. China.
Soils, Water and Environment Research Institute, Agricultural Research Center, Giza 12112, Egypt.
ACS Omega. 2020 Feb 18;5(8):4181-4190. doi: 10.1021/acsomega.9b03994. eCollection 2020 Mar 3.
Developing green 3D porous materials integrating multitasking environmental remediation with high efficiency and reusability is considered to be a promising sustainable approach and is urgently required. Herein, we have successfully prepared a facile, ecofriendly, and robust multifunctional composite sponge of carbon nitride (CN) nanosheets wrapping an elastomer polydimethylsiloxane (PDMS) skeleton without harsh treatments. The composite sponge (CN@PDMS) exhibits excellent hydrophobic and superoleophilic properties with a water contact angle of 133.2°. This sponge also shows high selective absorption of organic solvents and oils with high recyclability after 10 absorption cycles. Furthermore, the CN@PDMS sponge has a high ability for demulsification of the oil-in-water emulsion as well. The as-prepared sponge displays high thermal stability, retaining 82.16% of its original weight up to 550 °C, and extraordinary prolonged stability in harsh corrosive solutions over 35 h compared with the pristine PDMS sponge. Additionally, the CN@PDMS sponge exhibits a high ability for adsorption and photodegradation of rhodamine B under visible light irradiation with self-cleaning and high reusability over 5 runs. Such a sustainable strategy would provide new ways for broad environmental applications.
开发集成高效和可重复使用的多任务环境修复功能的绿色3D多孔材料被认为是一种有前景的可持续方法，且迫切需要。在此，我们成功制备了一种简便、环保且坚固的多功能复合海绵，其由包裹在弹性体聚二甲基硅氧烷（PDMS）骨架上的氮化碳（CN）纳米片组成，无需苛刻处理。复合海绵（CN@PDMS）表现出优异的疏水和超亲油性能，水接触角为133.2°。该海绵还对有机溶剂和油具有高选择性吸收，在10次吸收循环后具有高可回收性。此外，CN@PDMS海绵对水包油乳液也具有高破乳能力。所制备的海绵显示出高的热稳定性，在高达550°C时保留其原始重量的82.16%，并且与原始PDMS海绵相比，在苛刻的腐蚀性溶液中具有超过35小时的超长稳定性。此外，CN@PDMS海绵在可见光照射下对罗丹明B具有高吸附和光降解能力，具有自清洁和超过5次运行的高可重复使用性。这种可持续策略将为广泛的环境应用提供新途径。
