聚(对苯乙烯磺酸钠)/单宁酸/海藻酸钠三元复合水凝胶球对磷酸氯喹的高效吸附去除

Efficiently adsorptive removal of chloroquine phosphate by poly(sodium p-styrenesulfonate)/tannic acid/sodium alginate ternary composite hydrogel bead

本文以海藻酸钠、单宁酸和聚(对苯乙烯磺酸钠)为原料,通过一步共沉淀法制备了一种新型三元复合水凝胶珠状小球(SA/TA/PSS),用于去除水中一种常见抗病毒药物磷酸氯喹(CQ).详细考察了溶液p H、吸附时间、CQ初始浓度、水体中常见的无机和有机共存物及不同实际水体等因素对其吸附性能的影响. SA/TA/PSS能在3.0~10.0 p H范围内保持良好且稳定的CQ吸收去除效率.在初始p H值为7.0时,最大实验吸附量为0.766 mmol/g.共存二价阳离子会因竞争吸附而抑制对CQ的吸附,而腐殖酸对CQ吸附的影响很小. SA/TA/PSS经过六次吸附-解吸循环后,对CQ的吸附量仍保持90%左右. SA/TA/PSS还能有效吸附硫酸羟氯喹和磷酸奥司他韦等其他抗病毒药物.文章通过对吸附剂吸附前后红外光谱和X射线光电子能谱谱图变化进行分析,并结合吸附动力学、等温吸附及吸附热力学分析,深入探究了SA/TA/PSS对CQ的多重吸附机制, SA/TA/PSS可通过静电吸引、氢键、π-π电子供体-受体相互作用(π-πEDA)及螯合作用等与CQ有效结合,实现其在较宽p H范围内对抗病毒药物的高效去除.本文为设计和制备新型绿色高效吸附剂材料提供了一定的有益参考.

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 o adsoplion capacity up o.76 mmo/g.Coexistedivalent cations,including Ca^(2+) and Mg^(2+).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-EDA 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.