1. A novel Janus sponge fabricated by a green strategy for simultaneous separation of oil/water emulsions and dye contaminants.
- Author
-
Zeng, Xinjuan, Cai, Weicheng, Fu, Shuyi, Lin, Xiaomei, Lu, Qiaorou, Liao, Shuang, Hu, Huawen, Zhang, Min, Zhou, Cailong, Wen, Xiufang, and Tan, Shaozao
- Subjects
- *
POLYETHYLENEIMINE , *POLLUTANTS , *EMULSIONS , *SEWAGE , *INDUSTRIAL wastes , *PETROLEUM , *MALACHITE green , *DYE-sensitized solar cells - Abstract
A novel Janus sponge with the ability to remove complex contaminants from water is reported. Firstly, a superhydrophilic sponge (PA@PEI-sponge) is prepared via synthesizing negatively charged phytic acid@polyethyleneimine (PA@PEI) nanoparticles and assembling them on the surface of polydopamine (PDA) and PEI-modified polyurethane (PU) sponge through electrostatic adsorption. The Janus sponge is generated by modifying one side of the PA@PEI-sponge with PDMS, which exhibits superior separation efficiency and high filtration flux toward both water-in-oil and oil-in-water emulsions due to its multiplex selective wettability and the interconnected and tortuous 3D porous channels. The numerous negatively charged active sites of PA@PEI nanoparticles and PDA layer impart the superhydrophilic PA@PEI-sponge with the removal efficiency of 39.95 ± 0.27% for malachite green (MG) via simple flow-through filtration, which can be improved to 99.92 ± 0.07% by Janus modification. More importantly, the Janus sponge exhibits an excellent treatment capacity for complex mixtures containing emulsified oil and dye, with the separation efficiency above 99.59%. The Janus sponge also demonstrates the effective separation of real industrial wastewater collected from an acrylic dyeing plant. Together with a facile and green preparation strategy, this Janus sponge shows excellent application potential for simultaneous dye removal and oil/water emulsion separation. [Display omitted] • An eco-friendly Janus sponge is prepared using a facile and green strategy. • The Janus sponge can separate both water-in-oil and oil-in-water emulsions. • The Janus modification promotes the dye removal efficiency from 39.95% to 99.92%. • The Janus sponge exhibits an excellent treatment capacity for complex wastewater. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF