Jietao Hu,Lishuang Gui,Mingning Zhu,Kuiliang Liu,Ya Chen,Xiaopan Wang,Jing Lin
Oil spills and oily wastewater discharged from industries and households have resulted in environmental and economic concerns. Therefore, emerging Janus membranes with anisotropic wettability have attracted significant attention as next-generation oil/water separation membranes owing to their specific, on-demand separation ability. However, the one-step separation of complex wastewater has not yet been achieved. Herein, a pH-responsive siloxane modified polystyrene microsphere/zinc oxide/carbon nanotube/polyvinylidene fluoride (S/PS/ZnO/CNTs/PVDF) membrane was rationally designed with Janus surfaces for providing hydrophilicity/underwater lipophobicity and lipophilicity/underoil hydrophobicity functionality. This study demonstrates that the underlying mechanism of on-demand separation of water-in-oil and oil-in-water emulsion is related to wettability, adhesive forces, and intrusion pressure. The proposed Janus membrane can achieve one-step separation of complex wastewater comprising oil, bacteria, organic dye, and metal ions. The effective removal of dyes is due to synergistic effects of electrostatic adsorption and photodegradation. This facile strategy for fabricating smart Janus separation membranes has application potential in on-demand oil/water separation and practical complex wastewater separation.
Smart films, with reversible respone to external stimuli, are the key components of smart devices such as sensors, actuators and intelligent robotics. Among them, thermoplastics-based smart Janus films are particularly striking due to their asymmetric responsiveness and multifunctionality. However, the traditional preparation methods of Janus films such as electrospinning, filtration, or pasting are usually limited bue to their high requiremenets on instruments, operating procedures, and poor bonding forces. Here, we develop a one-step method of solvent and antisolvent crystallization to construct full-featured thermoplastics-based smart Janus films with excellent binding performance. Large-scale and low-cost arbitrary intelligent thermoplastics can be endowed by combining the optical and electrical properties of two-dimensional nanomaterials with the plasticity of thermoplastics. Here we demonstrate several proof-of-concept examples of typical smart properties including plasticity, self-healing, reprocessibility, smart actuation and recyclability, which provides a new direction for wearable devices.
危险品化学品经营许可证（带存储）