ADSORPTION PERFORMANCE OF TC AND Cu2+BY METAL-ORGANIC SKELETON HYBRID FOAMS
The removal of antibiotics and heavy metals in the medicine wastewater is a tricky problem,and the metal-organic skeleton hybrid foam MIL-100(Fe)/CMC was used to remove tetracycline(TC)and copper ions(Cu2+).The physicochemical properties of the MOFs hybrid foams were analyzed by X-ray diffraction,scanning electron microscopy,nitrogen adsorption and desorption,as well as thermogravimetric analysis techniques;the influencing factors,stability,and adsorption mechanisms of hybrid foams were analyzed by adsorption experiments.The results showed that MIL-100(Fe)/CMC had porous structure and high thermal stability;MIL-100(Fe)/CMC had-maximum adsorption capacity of 80.40 and 80.04 mg/g for tetracycline(TC)and Cu2+,respectively,in the optimal working condition of 30 mg/L contaminants,40 mg dosage of MIL-100(Fe)/CMC,16 hours adsorption time,pH of 6 the ionic strength(NaCl)was negatively correlated with adsorption performance.MIL-100(Fe)/CMC had excellent adsorption and cyclic regeneration performance,and the removal rates of TC and Cu2+maintained above 70％after six cycles of regeneration.The adsorption of TC and Cu2+by MIL-100(Fe)/CMC was a self-exothermic process,matching the Langmuir isotherm model and the proposed first-order kinetic model.In conclusion,the metal organic skeleton hybrid foam is proven to have a broad research prospect in the removal of mixed contaminants of antibiotics and heavy metals in the treatment of pharmaceutical wastewater.
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