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Novel magnetic molecularly imprinted polymers (MMIP) were prepared for selective removal of norfloxacin from ambient water by effectively utilizing photocatalytic degradation and magnetic separation techniques. The imprinted materials with titanium layer and multihole surface showed excellent photocatalytic property. In this paper, the kinetics of photocatalytic degradation of norfloxacin by MMIP was explored, and the influences of environmental factors, including solution pH, humic acid, common ions and water media on photocatalytic performance of the materials were elucidated. The results showed that MMIP had good adaptability and could degrade norfloxacin within 60 min, but the degradation rate constant decreased by 40.3% and 66.4% in tap water and surface water, respectively. According to the intermediates, the possible degradation pathways of norfloxacin were analyzed, speculating that norfloxacin might be degraded into small molecules after de-piperazine ring, de-carboxyl group and de-fluorine. Moreover, the mineralization ratio of norfloxacin could reach 84.2% after ultraviolet irradiation for 150 min. In the study of photocatalytic in-situ regeneration and recovery performance of MMIP, the total removal efficiency of norfloxacin was still 99.0% after seven cycles of adsorption-degradation tests. And the low cobalt release of MMIP by molecular imprinting technology enhanced the security of the materials.
Keywords
Magnetic molecularly imprinted polymers, Norfloxacin, Photocatalysis, Influencing factors, In-site regeneration, Applicability evaluation
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This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Research Article
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
History
CURRENT STATUS: Posted
View the published article at Environmental Technology.
Version 1
Posted 25 May, 2021
No community comments so far
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published article at Environmental Technology.
Novel magnetic molecularly imprinted polymers (MMIP) were prepared for selective removal of norfloxacin from ambient water by effectively utilizing photocatalytic degradation and magnetic separation techniques. The imprinted materials with titanium layer and multihole surface showed excellent photocatalytic property. In this paper, the kinetics of photocatalytic degradation of norfloxacin by MMIP was explored, and the influences of environmental factors, including solution pH, humic acid, common ions and water media on photocatalytic performance of the materials were elucidated. The results showed that MMIP had good adaptability and could degrade norfloxacin within 60 min, but the degradation rate constant decreased by 40.3% and 66.4% in tap water and surface water, respectively. According to the intermediates, the possible degradation pathways of norfloxacin were analyzed, speculating that norfloxacin might be degraded into small molecules after de-piperazine ring, de-carboxyl group and de-fluorine. Moreover, the mineralization ratio of norfloxacin could reach 84.2% after ultraviolet irradiation for 150 min. In the study of photocatalytic in-situ regeneration and recovery performance of MMIP, the total removal efficiency of norfloxacin was still 99.0% after seven cycles of adsorption-degradation tests. And the low cobalt release of MMIP by molecular imprinting technology enhanced the security of the materials.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
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