A substrate-free graphene oxide-based micromotor for rapid adsorption of antibiotics

Nanoscale
Yue DongBi-Feng Liu

Abstract

Self-propelled micro/nanomotors play a crucial role in the fields of biomedicine, energy and the environment but are limited by low throughput and a tedious fabrication approach. Here, we propose a simple microfluidics-based scheme for fabricating substrate-free graphene oxide (GO)-based micromotors of different shapes and sizes with high throughput. The micromotors are designed to possess a 'Janus'-like porous structure, and half of each micromotor is modified with hierarchical Pt nanoflowers, which can promote the wetting of Pt with an H2O2 solution and result in a high speed of movement. To investigate the applicability of the micromotors, they were employed to rapidly remove an antibiotic, namely, tetracycline, from a solution. It was found that the rapid movement of the micromotors increased the mass transfer of tetracycline and the frequency of collisions between tetracycline molecules and the micromotors, which led to a high removal efficiency. The direction of movement of the micromotors can be conveniently controlled by an external magnetic field. Furthermore, the removal efficiency and removal time as functions of the number of micromotors, the adsorption kinetics and adsorption isotherm, and the removal amount as a f...Continue Reading

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Citations

Feb 7, 2020·Chemistry : a European Journal·Antonios KouloumpisMichal Otyepka
May 8, 2021·Advanced Healthcare Materials·Shuanghu WangYingfeng Tu
Jul 6, 2021·Journal of Colloid and Interface Science·Enhui MaHong Wang
Oct 29, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Wen MaHong Wang
Dec 16, 2021·Advanced Healthcare Materials·Zifeng ZhangLi Zhang

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