Γ-Fe2O3@Ag-mSiO2NH2 magnetic Janus micromotor for active water remediation. (December 2021)

• Record Type: Journal Article
• Authors: Yang, Jie; Liu, Yong; Li, Jia; Zuo, Min; Li, Wenzheng; Xing, Ningning; Wang, Chengyan; Li, Tingting
• Is Part Of: Applied materials today. Volume 25(2021)
• Publication Date: 2021-12
• Subjects: Micromotor -- Mesoporous SiO2 -- Doxycycline -- Cu2+ -- Magnetic recycling -- Dynamic adsorption; Materials science -- Periodicals; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1016/j.apmt.2021.101190
• Languages: English
• ISSNs: 2352-9407

Abstract

Highlights: ● A novel γ-Fe2 O3 @Ag-mSiO2 NH2 magnetic Janus micromotor was prepared for dynamic removal of heavy metal ions and organic pollutants from water. ● The speed of Janus micromotor could reach 203.06 ± 10.6 μm s −1 in a 10% H2 O2 solution. ● The removal rates of DC and Cu 2+ by γ-Fe2 O3 @Ag-mSiO2 NH2 magnetic Janus micromotor were 2.18 times and 3.15 times than its non-micromotor and non-amino-functionalized counterparts. ● The coupling of magnetic γ-Fe2 O3 endowed the Janus micromotor with the capacities of remote navigation and magnetic recycling. Abstract: Micromotors have hold great promise for environmental remediation. Herein, we reported a novel γ-Fe2 O3 @Ag-mSiO2 NH2 magnetic Janus micromotor for dynamic removal of heavy metal ions and organic pollutants from water. The as-prepared Janus micromotors displayed unique core-shell structure composed of amino-functionalized meso‑SiO2 shell and γ-Fe2 O3 magnetic core, and could be propelled by O2 bubbles generated by Ag-catalyzed decomposition of H2 O2 . This Janus micromotor could move with a high velocity of 203.06 ± 10.6 μm s −1 (about 253.8 body lengths s –1 ) in 10 wt.% H2 O2 solution. γ-Fe2 O3 @Ag-mSiO2 NH2 magnetic Janus micromotor showed much higher removal capacities for Cu 2+ (15.59 mg g −1 ) and doxycycline (31.45 mg g −1 ) than its static control samples due to the synergy of self-propulsive movement and amino-functionalized porous core-shell structure. Furthermore, the magnetic γ-Fe2 O3 cores enabled the remote magnetic control on the movement direction and magnetic recycling. This work provides a new strategy for environmental pollutants treatment.