Preparation Of PVA-SA Hydrogel Beads And Their Performance Of Adsorbing Antibiotics From Water

Antibiotics have gained significant attention due to their widespread use in diseases treatment caused by both pathogenic and non-pathogenic bacteria.Their role in the contamination of surface water,groundwater,and environmental soil is on the increase.Excessive use of antibiotics has led to the emergence of antibiotic-resistant bacteria（ARB）and resistance genes（ARG）,which pose a serious threat to human health.For the past few years,antibiotics have attracted more and more attention as a new type of organic micro-pollutants.Conventional wastewater treatment processes are difficult to effectively remove antibiotic residues in water.Therefore,it is very important to explore methods to effectively remove antibiotic contaminants in water.Practical significance.As a very efficient and simple operation method,the adsorption method is widely used to remove organic pollutants in water,and has a good prospect for the removal of antibiotics.The focus of the adsorption method is on the selection of the adsorbent.Adsorbents commonly used to adsorb antibiotics include activated carbon,graphene,and resins.However,these methods have problems such as difficulty in separation,poor cycle performance,and low processing efficiency.C@PVA-SA,Fe₃O₄@PVA-SA and C-Fe₃O₄@PVA-SA gels were prepared by embedding powdered activated carbon,magnetic Fe₃O₄particles and co-embedding methods,respectively.Ball for adsorption of antibiotic pollutants in water.The results are as follows:（1）Characterization of the three gel sphere materials by means of SEM,FTIR,BET,XRD and VSM can be concluded that the particle size of the gel sphere is about 1.5 mm,the ball formation effect is good,the surface is rough,and it contains rich functional groups.Two kinds of magnetic gel spheres made by embedding magnetic Fe₃O₄particles can achieve magnetic separation.（2）Acidic conditions,increased temperature,increased initial antibiotic concentration,and increased contact time are conducive to increasing the adsorption capacity of the gel spheres;as the amount of adsorbent added increases,the removal rate of antibiotics will increase.Three kinds of gel ball adsorbents,after 8 cycles of use,the gel balls can maintain a spherical structure,maintain a certain amount of adsorption,and have good reusability.（3）The fitting results of the adsorption kinetics model and the adsorption isotherm model show that the C@PVA-SA adsorbent conforms to the quasi-first-order model,mainly physical adsorption;the Fe₃O₄@PVA-SA conforms to the quasi-second-order model,with chemical adsorption as the main;C-Fe₃O₄@PVA-SA adsorbent coexists with physical and chemical adsorption.The PVA-SA-based gel sphere adsorbent is more in line with the Langmuir model,and is mainly monolayer molecular adsorption.At 35°C,the maximum adsorption capacity of TC for three kinds of gel ball adsorbents of C@PVA-SA,Fe₃O₄@PVA-SA and C-Fe₃O₄@PVA-SA is 24.334 mg/g,63.685 mg/g,264.057 mg/g;C-Fe₃O₄@PVA-SA has a maximum adsorption capacity of SMX,TMP and CIP of 47.188 mg/g,59.649 mg/g and96.468 mg/g.（4）Through competitive adsorption experiments,it can be seen that the C-Fe₃O₄@PVA-SA gel ball adsorbent has the ability to simultaneously adsorb multiple antibiotic pollutants in water.And in the laboratory pure water,tap water and secondary effluent effluent have high removal rate,has a good practical application of water bodies.