首页|Ti3C2/W_(18)O_(49) hybrid membrane with visible-light-driven photocatalytic ability for selective dye separation
Ti3C2/W_(18)O_(49) hybrid membrane with visible-light-driven photocatalytic ability for selective dye separation
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NSTL
Toxic organic dyes are a serious threat to the global environment, and membranes with catalytic properties show great promise as a green water treatment method for removing these pollutants. Herein, Ti3C2/W_(18)O_(49) photo-catalytic membranes were constructed by vacuum filtrating Ti3C2 and W_(18)O_(49) to form a hybrid layer on a mixed cellulose ester (MCE) support. The efficient separation of dyes was attributed to the negative charge and abundant -OH groups of Ti3C2/W_(18)O_(49), which can capture cationic dyes by electrostatic adsorption and form hydrogen bonds with the amino groups of dye molecules. Moreover, the Ti3C2/W_(18)O_(49) membrane exhibited excellent photocatalytic performance and a dye-contaminated membrane was regenerated under visible light in 120 min. The two component materials complement each other, with the W_(18)O_(49) providing adsorption sites and photocatalytic ability and the Ti3C2 serving as an electron trap and improving charge separation. Photoinduced electrons in the conduction band of W_(18)O_(49) are transferred to Ti3C2 to form ~·O_2~- while holes remain in the valence band of W_(18)O_(49) to generate 'OH, and h~+. ~·O_2~- and 'OH are mainly responsible for the degradation of dyes. Therefore, this efficient and easily prepared membrane shows practical potential as a next-generation method for dye removal from water.
Institute of Environmental Engineering & Nano-Technology, Tsinghua Shenzhen International Graduate School Tsinghua University, Shenzhen 518055, Guangdong,China
School of Environment, Tsinghua University, Beijing 100084, China
NSTL
