Preparation Of La-doped ZIF-67 And Its Adsorption Performance For Chlortetracycline Hydrochlorid

Antibiotics have saved the lives of many organisms since they were discovered and used to treat diseases.However,the large-scale production and widespread usage of antibiotics has resulted in a deleterious impact on the ecological environment.To address this issue,metal-organic frameworks(MOFs)have emerged as a promising solution due to their h igh porosity,low density,regular pore size,and sizable specific surface area,all of which make MOFs highly effective in the adsorption of polluted waste water.In this current study,La ions were strategically doped into ZIF-67,resulting in the formation of La-ZIF-67.Through the systematic examination of La-ZIF-67’s adsorption performance on antibiotics found in wastewater,a notable enhancement in adsorption capacity was observed when compared to pure ZIF-67.These results suggest a promising alterna tive in the fight against antibiotic pollution within our environment.This study employed a facile physical precipitation method to synthesize La-ZIF-67 using cobalt nitrate hexahydrate as a metal center,2-methylimidazole as a coordinating ligand,and me thanol as an organic solvent.Lanthanum nitrate hexahydrate was additionally introduced in appropriate amounts.The experimental results demonstrate that 20 % La doping represents the optimum condition for the preparation of the adsorbent.The synthesized material was characterized using various techniques including XRD,SEM,TEM,XPS,TGA,FT-IR,and nitrogen adsorption-desorption isotherms.The results showed successful incorporation of La into ZIF-67.In the adsorption experiments,La-ZIF-67 exhibited faster antibiotic adsorption rates and significantly increased equilibrium adsorption capacity compared to pure ZIF-67.Additionally,the effects of solution p H,initial concentration of chlortetracycline hydrochloride,initial adsorbent dosage,and contact time on the adsorption performance were investigated.The adsorption dynamics of chlortetracycline hydrochloride on La-ZIF-67 conforms to a pseudo-second-order kinetic model,revealing the distinctive chemical adsorption characteristics exhibit ed by the compound on the La-ZIF-67 substrate.