High performance of Mn2(BDC)2(DMF)2-derived MnO@C nanocomposite as superior remediator for a series of emergent antibiotics.

Metal-organic frameworks (MOFs) present as ideal platforms towards synthesizing metals/metal oxides self-supported in porous carbon matrix. Herein, we described an effective strategy to transform manganese-based MOFs, namely Mn 2 (BDC) 2 (DMF) 2 , into MnO@C porous nanocomposite via a facile and one-pot pyrolysis procedure. Fourier-transform infrared spectroscopy (FT–IR) results indicated the transformation of coordination bonds into ionic bonds of Mn(II)–O. The morphological profiles also elucidated the MnO nanoparticles embedded carbonaceous structure while other physicochemical techniques such as X-ray photoelectron spectroscopy (XPS) demonstrated the important chemical bonds (e.g. C C in aromatic rings, C O in phenolic/alcoholic groups, C O in carbonyl groups, and O C O in carboxyl groups, etc.) on MnO@C surface. Uptake application of MnO@C for a wide range of antibiotic contaminants involving tetracycline (TCC), ciprofloxacin (CFX), diclofenac (DCF) and chloramphenicol (CAP) in aqueous phases was notably reported. Through the nonlinearization of kinetic and isotherm models, validation for maximum adsorption capacities could be attainable, at 79.9 mg/g (CAP) < 92.4 mg/g (DCF) < 170.3 mg/g (TCC) < 235.6 mg/g (CFX), indicating the great potential of MnO@C nanocomposite for removing many kinds of emergent antibiotics from the wastewater. Unlabelled Image • Novel MnO@C nanocomposite was directly fabricated from Mn 2 (BDC) 2 (DMF) 2. • Conversion of coordinated Mn(II)-O into ionic bond was confirmed. • Kinetic and isothermal models were vigorously employed via nonlinearization. • Error functions (R2, χ2, MPSD and HYDRID) were used for adsorption models. • MnO@C can adsorb for a wide range of antibiotics with capacities obtained from 79.9 to 235.6 mg/g. [ABSTRACT FROM AUTHOR]