Study On Adsorption Of Antimony From Aqueous Solution Using MOFs-Based Graphene Oxide GMFe-2

Antimony and its derivatives are frequently utilized in industry.As the use of antimony products grows,a considerable number of antimony-containing contaminants are released directly into the aquatic environment without being treated,causing significant damage to water bodies.Antimony-polluted water bodies the pollution is persistent,the radiation range is broad,the treatment difficulty is considerable,and the toxicity is significant,all of which put human health at risk.As a result,developing novel antimony pollution management measures for water has become a pressing issue that must be addressed.MIL-53（Fe）and various quantities of composites GMFe-X were synthesized in situ utilizing metal framework materials（MOFs）and graphene oxide（GO）as precursors using a solvothermal technique（X=0.5,1,2,5,10 respectively）.Experiments show that the GO ratio in the composite（GMFe-2）is 2%,that the adsorption capacity for Sb（Ⅲ）is the best,and that when the adsorption capacity of the composite and single MIL-53（Fe）for Sb（Ⅲ）is compared under different p H settings,the former is superior than the latter.MIL-53（Fe）and GMFe-2 were characterized by SEM,XRD,XPS,BET,FT-IR and other test methods.The results showed that MIL-53（Fe）was successfully compounded with GO.All have changed,but the material still highly maintains the structure of MIL-53（Fe）,the specific surface area and pore volume are increased by 53.91%and 63.64%respectively compared with MIL-53（Fe）,which accommodates abundant oxygen-containing groups,increasing adsorption sites for antimony.Through single-factor experiments,combined with response surface method,the adsorption model was established,and the influence of five factors,such as adsorption time,p H,temperature,dosage,and Sb（Ⅲ）/Sb（V）initial concentration,on the adsorption process of antimony was discussed.The analysis showed that the dosage,p H,temperature and the initial concentration of Sb（Ⅲ）had a significant effect on the adsorption of Sb（Ⅲ）;the dosage and temperature had a significant effect on the adsorption of Sb（V）;the optimal conditions for the adsorption of Sb（Ⅲ）/Sb（V）were,respectively,the initial concentration of Sb（Ⅲ）was 10.09mg/L,the adsorption time was 4.86 h,The dosage of adsorbent is 85.79mg,the reaction temperature is 39.29℃,p H=10.0,the removal rate of Sb（Ⅲ）is 97.60%;the initial concentration of Sb（V）is 23.22mg/L,the adsorption time is 2.7h,and the dosage of adsorbent is 27.22 mg,reaction temperature 34.63℃,p H=4.13,the removal rate of Sb（V）was 98.92%.Coexisting ions and regeneration research experiments show that only CO₃^2-has a significant inhibitory effect on the adsorption of Sb（V）;after four repeated use of the adsorbent,the removal rate of Sb（Ⅲ）is still 80.25%,and the removal rate of Sb（V）is still 80.25%.There are 70.78%.The adsorption kinetics and adsorption thermodynamics studies show that the adsorption of Sb（Ⅲ）conforms to the Freundlich model curve,and it is a multilayer adsorption;the adsorption process of Sb（V）conforms to the Langmuir model curve,and it is a monolayer adsorption;The process matching degree is higher;the model agrees that the adsorption process of Sb is mainly chemical adsorption,the adsorption rate of Sb（V）is faster than that of Sb（Ⅲ）,and the adsorption capacity of Sb（V）is higher.The adsorption mechanism study shows that different functional groups（C=O,-OH,Fe-O）,α-Fe₂O₃,Fe³⁺react with Sb,and form Fe-O-Sb through coordination,complexation,oxidation and other chemical effects.The compound removes antimony from the water.