PREPARATION AND CHARACTERIZATION OF DEFECTIVE Zr-BASED METAL-ORGANIC FRAMEWORKS AND THEIR ADSORPTION PROPERTIES FOR TETRACYCLINE
Adsorption has the potential to be broadly applied in the field of sewage purification due to advantages such as low costs,less energy consumption,ease of operation and environmental friendliness.In this work,Zr-based metal-organic frameworks(UiO-66-NH2)with defects were successfully prepared by a facile solvothermal method,which was used to removal tetracycline from wastewater.Defective UiO-66-NH2 was characterized by X-ray diffraction(XRD),field emission electron microscope(FESEM),Fourier transform infrared(FT-IR),nitrogen adsorption-desorption and X-ray photoelectron spectroscopy.In order to achieve optimum conditions of tetracycline from aqueous solutions,based on single-factor tests,response surface methodology(RSM)and Box-Behnken design(BBD)were employed to examine the interaction of factors and optimize the adsorption operation parameters,including adsorbent dose,the initial concentration of tetracyclines,pH and contact time.The optimum conditions of maximum adsorption(71.85 mg/g)were found as follows:10 mg of adsorbent dosage,initial tetracycline concentration of 27 mg/L,pH=3.8 and adsorption time of 3 h.In addition,regeneration experiments showed that the adsorption efficiency of tetracycline after five adsorption-desorption cycles with good uptake efficiency(68.33 mg/g)and UiO-66-NH2 exhibited quite a good cyclic stability.
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