Adsorptive Removal Of Sulfonamide Antibiotics From Aqueous Solution By Granular Activated Carbon And Modified Attapulgite

Sulfonamides are widely used in livestock and poultry breeding activities.They are one of the main sources of antibiotic pollutants in water environment.They are harmful to ecosystems and human survival.How to effectively remove sulfa antibiotics from water environment has become a The hotspots that scholars have paid attention to in recent years.In this study,Granular activated carbon?GAC?and Cetrimonium Bromide?CTMAB?modified Attapulgite?ATP?were used as adsorbents for sulfonamides in water.The adsorption and removal treatment of antibiotics was carried out to study its adsorption characteristics and adsorption mechanism.The main results are as follows:?1?The adsorption and removal of sulfapyridine?SPD?and Sulfathiazole?STZ?by GAC showed that the adsorption of SPD and STZ by GAC reached dynamic equilibrium in 120 min,and GAC in the range of pH 2¹1.The adsorption effect of SPD and STZ was not significant,and the removal rate was above 96%.When the humic acid in the water ranged from 0 to 200mg/L,the adsorption of SPD by GAC decreased slightly with the increase of humic acid concentration.However,the removal rate is still above 70%,the adsorption of STZ on GAC is basically unaffected,and the removal rate is above 99%.The adsorption thermodynamics study shows that GAC adsorption of SPD and STZ is a spontaneous endothermic process,and mainly Physical adsorption.?2?The adsorption results of 10 CEC-ATP on SPD and STZ showed that the adsorption of SPC and STZ by 10 CEC-ATP reached dynamic equilibrium at 120 min and 90 min,respectively,and increased first and then decreased in the range of pH 2¹1.Small,and with the increase of pH value,the adsorption rate shows an upward trend;K⁺,Na⁺,Ca²⁺,Mg²⁺,SO₄^2-plasma has little effect on the adsorption of 10 CEC-ATP on SPD and STZ,that is,the ionic strength has no obvious effect on adsorption.The effect of SPD on 10 CEC-ATP is basically unaffected when the humic acid in the water range is from 0 to 100 mg/L.When the humic acid concentration reaches 200 mg/L,10 CEC-ATP removes the SPD.The effect is slightly reduced,and the adsorption removal of STZ is basically unaffected;adsorption thermodynamics studies show that 10 CEC-ATP adsorption SPD and STZ are a self-heating process,and mainly chemical adsorption.?3?Simultaneous adsorption and removal of three typical sulfa antibiotics,sulfapyridine,sulfathiazole and sulfadiazine,by GAC and 10 CEC-ATP,respectively.The results showed that GAC had no significant difference in the adsorption of three sulfonamides.The initial concentration of antibiotics increased,and the adsorption equilibrium time increased.In the range of pH 2¹1,GAC had little effect on the adsorption of three sulfonamides,and the adsorption removal rate could reach 100%.In the range of pH 2¹1,10 CEC-ATP showed selectivity for the adsorption of three sulfonamides,STZ>SD>SPD;under the same conditions,STZ reached the adsorption equilibrium first,and the adsorption amount was much larger than SD and SPD.The presence of humic acid has a certain influence on the adsorption of SPD,and has no effect on the adsorption of STZ and SD.