Preparation of a stable polyurethane sponge supported Sn-doped ZnO composite via double-template-regulated bionic mineralization for visible-light-driven photocatalytic degradation of tetracycline. Issue 4 (August 2021)

• Record Type: Journal Article
• Authors: Liu, Zhihan; Cai, Xiunan; Fan, Songlin; Zhang, Yanjuan; Hu, Huayu; Huang, Zuqiang; Liang, Jing; Qin, Yuben
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 4(2021)
• Publication Date: 2021-08
• Subjects: Sn-doped ZnO composite -- Polyurethane sponge -- Double-template -- Photocatalyst -- Stability; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.105541
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: A new tin-doped zinc oxide@polydopamine-modified polyurethane (Sn-ZnO@PDA/PU) composite photocatalyst was prepared by in-situ growth of tin-doped zinc oxide (Sn-ZnO) on the surface of polydopamine-modified polyurethane (PDA/PU) via double-template-regulated bionic mineralization strategy. The flake-like Sn-ZnO regulated by soft template (sodium citrate) contributed to outstanding photocatalytic activity of Sn-ZnO@PDA/PU composite. In addition, the intimate interface and stable structure between Sn-ZnO and PDA/PU promoted by double-template-regulated bionic mineralization induced the formation of more active sites and extended absorption from UV to visible region. In the visible-light-driven reaction for the degradation of tetracycline (TC) using Sn-ZnO@PDA/PU as photocatalyst, 96.8% of TC removal and 42.3% of TOC removal were achieved within 120 min under optimal reaction conditions. The removal rates of TC were all more than 90% in a wide pH range of 4–11. Sn-ZnO@PDA/PU showed a promising cycling stability, which kept high-efficiency TC removal of 91.7% and low leaching rate of zinc after five cycles. This was ascribed to that the special morphologic structure of the composite could accelerate charge transfer and reduce the defect exposure, thereby protecting Sn-ZnO from photo-corrosion and environmental implication during photocatalyst reaction. Comprehensive and comparative studies indicated that the Sn-ZnO@PDA/PU composite exhibited outstanding photocatalytic activity, reusability, and stability, which has great application potential for efficient degradation of organic contaminants in wastewater. Graphical Abstract: ga1 Highlights: Sn-ZnO@PDA/PU was prepared by double-template-regulated bionic mineralization. Template regulation shortened the reaction pathway between photo-induced electrons. The structural characteristics of Sn-ZnO improved the stability of the composite. Sn-ZnO@PDA/PU composite exhibited good photocatalytic activity and reusability. Effective composite for visible-light-driven catalytic degradation of tetracycline.