Efficiently adsorptive removal of chloroquine phosphate by poly(sodium p-styrenesulfonate)/tannic acid/sodium alginate ternary composite hydrogel bead
In this study,a novel ternary composite hydrogel bead(SA/TA/PSS)was designed and prepared by one-step coprecipitation method using sodium alginate(SA),tannic acid(TA)and poly(sodium p-styrene sulfonate)(PSS)as raw materials.SA/TA/PSS was used for the adsorptive removal of chloroquine phosphate(CQ),a commonly used antiviral drug,from water.The effects of solution pH,adsorption time,initial concentration of CQ,common inorganic and organic coexisting substances,and different actual water samples on the adsorption performance of SA/TA/PSS were investigated in detail.The experimental results showed that SA/TA/PSS could maintain high and stable CQ adsorption efficiencies over a wide range of solution pH from 3.0 to 10.0.At an initial pH of 7.0,SA/TA/PSS exhibited a maximum experimental CQ adsorption capacity up to 0.766 mmol/g.Coexisted divalent cations,including Ca and Mg,inhibited CQ adsorption due to the competitive adsorption.However,humic acid had little effect on this adsorption.The adsorption capacity of SA/TA/PSS for CQ maintained about 90％after six adsorption-desorption cycles,and its structure remained stable.In addition to CQ,SA/TA/PSS could effectively adsorb two other antiviral drugs,namely hydroxychloroquine sulfate and oseltamivir phosphate.By studying the changes in Fourier infrared and X-ray photoelectron spectra of adsorbents before and after adsorption,as well as combination of the adsorption kinetics,isotherms and adsorption thermodynamics,the adsorption mechanisms of SA/TA/PSS to CQ was deeply explored.SA/TA/PSS could interact with CQ through multiple interactions,including electrostatic attraction,hydrogen bonding,π-πEDA interaction,and chelating effects.The involved multiple adsorptions caused a high performance of SA/TA/PSS in adsorptive removal of these antiviral drugs over a wide pH range from 3.0 to 10.0.This work provides an effective strategy for the design and fabrication of novel,green,and high-performance adsorbents.
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