Research On Preparation Of MOFs Derived Porous Carbon/Cu@Cu₂O And Its （Electro） Adsorption Properties Of Pollutant From An Aqueous Solution

At present,the problem of environmental pollution such as antibiotics is becoming more and more serious.The development of new environmental functional materials and water treatment technology provides a new method and new idea for efficient removal of pollutants in water environment.In this study,MOFs derived porous carbon/Cu@Cu₂O was designed and synthesized for the efficient removal of salt and antibiotics in antibiotic wastewater treatment.The mechanism of the removal of pollutants by MOFs derived porous carbon/Cu@Cu₂O was explored,and the main results are as follows:（1）Cu-based metal organic framework（MOF）HKUST-1 was successfully prepared by hydrothermal method.HKUST-1 was carbonized in nitrogen atmosphere to prepare HKUST-1 derived carbon/Cu@Cu₂O（HDC-350 and HDC-1100）.The precursor and derived carbon composites were characterized by SEM,TEM,FTIR,XRD and XPS.It was found that with the increase of pyrolysis temperature,the collapse of metal framework of MOF increased obviously,and Cu also gathered to a certain extent.Compared with HDC-350,HDC-1100 has higher specific surface area(145.73 m² g^-1).Carboxyl,hydroxyl,carbonyl and other oxygen-containing functional groups are distributed on the surface of the MOFs derived porous carbon/Cu@Cu₂O composite.（2）MOFs derived porous carbon/Cu@Cu₂O were applied in the adsorption field to remove antibiotics from water.Taking ciprofloxacin（CIP）and tetracycline（TC）as target pollutants,the adsorption properties of HDC-1100 and HDC-350were studied.The results show that HDC-1100 has strong adsorption capacity for CIP,and the maximum adsorption capacity fitted by Langmuir is 592 mg g^-1.The adsorption effect of HDC-1100 remains stable in the presence of humic acid,and the effect of adsorbent decreases with the presence of microplastics.Combined with the characterization results and experimental results,it is preliminarily inferred that the high adsorption efficiency of HDC-1100 for antibiotics may be due to the combined action of metal organic complex,electrostatic interaction and hydrogen bonding.HDC-350 was less effective than HDC-1100 in adsorbing TC,and could reach adsorption equilibrium within 48 h,with the maximum adsorption capacity of130 mg g^-1.Through characterization and experimental analysis,it is found that ion exchange is the main adsorption mechanism.（3）HDC-1100 and HDC-350 thin film electrodes were prepared to solve the problems of adsorbent desorption,regeneration and recovery.They were applied to the electro adsorption,and the adsorption/desorption of pollutants was realized by applying a weak electric field.In this study,sodium chloride was used as the target pollutant to study MOFs derived porous carbon/Cu@Cu₂O.The desalting performance and mechanism of the system are discussed.It is found that the decrease of current density and the increase of voltage window are helpful to improve the desalination capacity of the two electrodes,because the ions in the solution move to the electrode for a longer time and have a greater driving force.The desalting capacity,desalting rate and energy consumption of HDC-1100electrode are better than those of HDC-350 electrode,which are caused by many factors such as specific surface area,pseudo capacitance effect and specific capacitance difference.In conclusion,a novel material,MOFs derived porous carbon/Cu@Cu₂O was successfully synthesized and can be used as highly efficient adsorbents and electrosorptive materials,which shows good application efficiency in adsorption process and electrosorption desalination process.Moreover,the preparation of thin film electrodes solves the problem of difficult separation and recovery of adsorbent.The results showed that MOFs derived porous carbon/Cu@Cu₂O has great research value and potential application prospect in water pollution control.