Bi2S3@Ag2S nano-heterojunction decorated self-floating carbon fiber cloth and enhanced solar-driven photothermal-photocatalytic performance. (May 2021)

• Record Type: Journal Article
• Authors: Zhang, Zhen; Xing, Zipeng; Wang, Ke; Cheng, Tianzhi; Li, Zhenzi; Zhou, Wei
• Is Part Of: Chemosphere. Volume 271(2021)
• Publication Date: 2021-05
• Subjects: Photocatalysis -- Photothermal conversion -- Bi2S3@Ag2S -- Carbon fiber cloth -- Self-floating film; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.129500
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: The difficult recycle, secondary pollution and insufficient sunlight utilization of powder photocatalysts are main obstacles for practical applications. Bi2 S3 @Ag2 S heterojunction supported on surface of carbon fiber cloth (CC) are fabricated through hydrothermal in-situ growth method combined with ultrasonic loading strategy, which can be self-floated on water surface. Bi2 S3 @Ag2 S nano-heterojunction with narrow band gap shows enhanced full spectrum absorption, which is in favor of improving the photocatalytic-photothermal performance. Self-floating CC as a substrate not only absorbs solar light converting to thermal energy, but also favors the recycle of catalysts. The resultant Bi2 S3 @Ag2 S/CC composite films exhibit excellent photothermal conversion performance and photocatalytic degradation activity for tetracycline hydrochloride in low temperature wastewater under simulated sunlight. Experimental results confirm that the superoxide group (·O2 − ) is the main factor for the robust catalytic performance. The good photothermal-photocatalytic performance can be ascribed to the efficient absorption of sunlight for self-floating characteristics and high charge carriers separation efficiency of Bi2 S3 @Ag2 S nano-heterojunction. This novel self-floating photothermal-photocatalytic film will have potential applications in fields of environment. Graphical abstract: Image 1 Highlights: Bi2 S3 @Ag2 S/carbon fiber cloth as self-floated photocatalyst is prepared. Bi2 S3 @Ag2 S carbon fiber cloth showed excellent photocatalytic degradation activity for low temperature wastewater. It narrows the bandgap and extends the photoresponse to NIR region. It exhibits synergistic enhanced photocatalytic-photothermal performance. Bi2 S3 @Ag2 S/carbon fiber cloth can be easily recycled and remains high stability.