Preparation Of Polyacrylate-divinylbenzene Microspheres And Their Adsorption Effects Of Organic Pollutants

Organic micro-pollutants(OMPs)have become one of the worldwide issue of increasing environmental concern.Due to the fact that the stable chemical structure,toxicological concerns,and long half-life of OMPs in aqueous environment,they threaten public health and drinking water safety seriously.Adsorption is proven to be an effective,green,and simple method to remove pollutants from water.To obtain larger adsorption capacity and high regeneration efficiency,much attention has been focused on synthesizing novel adsorbents.On account of the high specific surface area,abundant functional groups,and designable structure,polymeric microspheres are considered as efficient adsorbents for the removal of pollutants from contaminated water.In this study,polymeric microspheres,synthesized by acrylics monomers and divinylbenzene,are prepared by precipitation polymerization successfully.The effective interactions between polymeric adsorbents and organic pollutants causing adsorption behaviors mainly includes:(1)hydrophobic interaction.(2)hydrogen bonding interactions.(3)van der Waals force.Based on the adsorption mechanism mentioned above,organic micro-pollutants contain hydroxy,amidogen,aromatic or heterocyclic ring are chosen as the target pollutants such as: atrazine,phenol,2,4 dichlorophenol,2,6 dichlorophenol,2,4 dibromophenol,sulfamethoxazole,estradiol,and bisphenol A.Therefore,the adsorption mechanisms between polymeric microspheres and OMPs were discussed,and the adsorption capability was compared between polymeric adsorbents and activated carbon.The microspheres could be regenerated by alcohol,which made it possible for the practical application in the future water treatment.The polymeric microspheres were prepared by precipitation polymerization,and the synthesis condition was optimized.A scanning electronic microscope was employed to characterize the surface morphology of the serial resins.The surface functional groups were identified by the FT-IR spectroscopy.Experimental results showed that the adsorption kinetics fit well with the pseudo-second-order model,and the adsorption isotherms could be correlated to both the Langmuir equation and Temkin equation.The maximum adsorption capacities of polymeric microspheres for ATZ,2,4-DCP,2,6-DCP,SMX,E2,and BPA were 119.6 mg/g,85.28 mg/g,62.39 mg/g,39.95 mg/g,163.0 mg/g,and 120.89 mg/g,respectively.The adsorption performance of the prepared polymeric microspheres was compared to that of the activated carbon.The results showed that polymeric adsorbents possessed better performance in term of adsorption efficiency and resistant to the interference by humic acid.Nearly 100% regeneration efficiency for the microspheres was achieved by 80% ethanol and 0.5mol/L Na OH,and the adsorption efficiency could maintain almost 93% after recycled for 6 times.