Adsorptive removal of nitroimidazole antibiotics from water using porous carbons derived from melamine-loaded MAF-6

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>Nitrogen-containing carbons were obtained via pyrolysis of melamine-loaded metal azolate frameworks (named mela@MAF-6), a sub-class of metal organic frameworks. The porosity and defect concentration of the obtained carbons (named as CDM@M-6) were dependent on the quantity of melamine loaded in the mela@MAF-6. The CDM@M-6 s were applied for the adsorptive removal of nitroimidazole antibiotics (NIABs) from water; the performance of CDM@M-6, particularly CDM(0.25)@M-6, was outstanding for the elimination of NIABs such as dimetridazole (DMZ), metronidazole (MNZ), and menidazole (MZ)) from water. The adsorption capacity of CDM(0.25)@M-6 for DMZ, MNZ, and MZ was higher than that of any adsorbent reported so far. The highest adsorptive performance of CDM(0.25)@M-6 for DMZ (<I>Q</I> <SUB>0</SUB>: 621 mg/g) and MNZ (<I>Q</I> <SUB>0</SUB>: 702 mg/g) was explained by hydrogen bonding, where CDM@M-6 and DMZ/MNZ acted as a H-donor and H-acceptor, respectively. In addition, CDM(0.25)@M-6 could be regenerated via ethanol washing and reused for next cycles without any severe decrease in performance. Therefore, CDM@M-6 is recommended as a suitable adsorbent for the elimination of NIABs from water.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Porous carbon was derived firstly from pyrolysis of melamine-loaded MAF-6. </LI> <LI> The carbon showed the highest adsorption for the nitroimidazole antibiotics from water. </LI> <LI> Melamine loaded in suitable quantity increased porosity of carbon and capacity for NIABs. </LI> <LI> The adsorption could be explained with H-bonding where NIABs were H-acceptor. </LI> <LI> The carbon was reusable with little decrease in performances by ethanol washing. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>