Polydopamine-mediated modification of ZIF-8 onto magnetic nanoparticles for enhanced tetracycline adsorption from wastewater

• Published in: Chemosphere (Oxford) Vol. 308; p. 136249
• Main Authors: Sheng, Daohu, Ying, Xintong, Li, Rui, Cheng, Siyao, Zhang, Cheng, Dong, Wei, Pan, Xihao
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-12-2022
• Subjects: Adsorption; Fe3O4 nanoparticles; Polydopamine; Tetracycline; ZIF-8; Polydopamine; ZIF-8; Adsorption; Fe3O4 nanoparticles; Tetracycline
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2022.136249

Magnetic nanoparticle materials which could be used to remove tetracycline were confined seriously due to their poor stability and unsatisfactory reusability. Here, we facilely prepared novel zeolitic imidazolate framework-8 (ZIF-8) functionalized magnetic nanoparticles (Fe3O4@PDA-ZIF-8) adsorbent utilizing polydopamine as a bond to establish a connection between zeolitic imidazolate framework-8 and Fe3O4, which could improve the stability of magnetic nanoparticles and enhance the tetracycline adsorption capacity simultaneously. The prepared nanocomposites were characterized and their TC adsorption abilities under various experiment conditions (contact time, TC initial concentration and pH values) were also investigated. Experimental results proved that the prepared adsorbent showed superior TC adsorption capacities (92.01 mg/g at pH = 7). Further, the adsorption mechanisms were comprehensively studied and the prepared adsorbent showed satisfactory stability and reusability during the cycle experiment. Altogether, our findings provided a feasible way to design and construct functional magnetic MOF materials for enhancing tetracycline adsorption from wastewater.
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•Fe3O4@PDA-ZIF-8 nanoparticles were first used as the adsorbent of tetracycline.•The maximum adsorption capacity of Fe3O4@PDA-ZIF-8 for TC was 92.01 mg/g.•Fe3O4@PDA-ZIF-8 can be recycled quickly and reused many times.•A detailed adsorption mechanism for TC in Fe3O4@PDA-ZIF-8 system was proposed.