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Bioinspired zeolitic imidazolate framework (ZIF-8) magnetic micromotors for highly efficient removal of organic pollutants from water

Author:
Liu, Jun, Li, Jia, Wang, Gui, Yang, Wenning, Yang, Jie, Liu, Yong
Source:
Journal of colloid and interface science 2019 v.555 pp. 234-244
ISSN:
0021-9797
Subject:
adsorption, aqueous solutions, catalysts, cellulose, doxycycline, ferric oxide, fuels, hydrogen peroxide, kapok, lignin, maghemite, magnetism, mixing, pollutants, remediation, water treatment
Abstract:
This paper reports the first proof-of-concept of using bioinspired ZIF-8 based micromotors for efficient water remediation. Natural kapok fibers have unique hollow structure that contains cellulose and lignin, inspiring the design and fabrication of bubble-driving tubular micromotors as an active self-propelled micromachine for the removal of organic pollutants from water. The outer dense ZIF-8 layer can adsorb organic pollutants on the micromotors, and the inner catalyst acts as the engine decomposing fuel H2O2 for providing bubble propulsion. The magnetic γ-Fe2O3 enables the external magnetic control movement and recovery of micromotors. The maximum adsorption capacity of ZIF-8-based magnetic micromotors toward Congo red and doxycycline were high as 394 and 242 mg g−1, respectively, mainly due to the enhanced micromotor-pollutant contacts by their autonomous motion and the resulting mixing associated effect. This novel ZIF-8 micromotor also showed outstanding stability and reusability in aqueous solution, indicating that their great potential for future application in water treatment.
Agid:
6543297