期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 1, 页码 755-764出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c20404
关键词
electrospinning; metal-organic framework; mesopore; fiber adsorbent; antibiotic removal
资金
- National Natural Science Foundation of China [52003040, 51902050, 91622106, 21531003]
- 111 Program [B18012]
- Fundamental Research Funds for the Central Universities [2412019QD005, 135110037, 2412020ZD015]
- China Postdoctoral Science Foundation [2019M651183]
Researchers constructed interconnected mesopores in electrospun zeolitic imidazolate framework-8 (ZIF-8)/polyacrylonitrile (PAN) fibers with the assistance of poly(vinylpyrrolidone) to expose more adsorption sites and improve stability. The obtained fibers showed faster adsorption kinetics and larger adsorption capacity for antibiotic tetracycline removal compared to other strategies, demonstrating great potential for antibiotic drug removal.
Recently, metal-organic framework (MOF)-based electrospun fibers have attracted considerable attention as adsorbents for organic contaminant removal from water. To prepare these fibers, two common strategies including blending electrospinning and surface coating are employed. However, fibers obtained from the two strategies still have some disadvantages, such as adsorption site blockage and unstable loading. Here, we constructed interconnected mesopores in the electrospun zeolitic imidazolate framework-8 (ZIF-8)/polyacrylonitrile (PAN) fibers with the assistance of poly(vinylpyrrolidone) to expose more adsorption sites of ZIF-8 and make ZIF-8 more stable. Moreover, the mesopores could also enhance the diffusion of contaminant molecules and create MOF-polymer interfaces in the fiber, which improve the adsorption rate and adsorption capacity, respectively. The obtained fibers were used to adsorb antibiotic tetracycline from water. Benefiting from the mesoporous adsorption channels and the MOF-polymer interface, porous ZIF-8/PAN fibers showed faster adsorption kinetics than ZIF-8/PAN blending fibers and larger adsorption capacity than ZIF-8-coated PAN fibers and ZIF-8/PAN blending fibers. The maximum adsorption capacity of porous ZIF-8/PAN fibers was 885.24 mg/g, which is close to that of pure ZIF-8. After 10 adsorption-desorption cycles, the removal efficiency was still above 97%. In addition, porous ZIF-8/PAN fibers could act as the membrane adsorbents to dynamically separate tetracycline with a treated capacity of 9.93 x 10(3) bed volumes. These results demonstrate that our prepared porous ZIF-8/PAN fibers have great potential in antibiotic drug removal.
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