摘要
本工作研究了金属有机骨架UiO-66(Zr)成型材料的制备及其对水中砷酸根离子的吸附净化。通过扫描电子显微镜(SEM)、X射线衍射(XRD)、氮气吸附和平衡吸附实验等探究了UiO-66(Zr)粉末添加量和复合凝胶微球干燥方式对其成型结构和除砷性能的影响。当UiO-66(Zr)粉末添加量为50%(质量分数)时,采用闪速冷冻法干燥得到的UiO-66(Zr)/海藻酸钠(SA)复合凝胶微球的物理化学性能最佳。进一步研究了所制备的UiO-66(Zr)/SA复合凝胶微球对水中As(V)的吸附性能,并与某商品除砷材料MN进行对比。结果表明:静态吸附条件下,As(V)初始浓度为20 mg/L、pH值为7.0时,最优成型条件下制备的UiO-66(Zr)/SA复合凝胶微球的最大吸附量为18.65 mg/g;动态填充柱吸附条件下,含1.0 g UiO-66(Zr)的复合凝胶微球材料可净化处理1.2 L初始浓度为100μg/L的含As(V)水样,出水As(V)浓度低于10μg/L,UiO-66(Zr)/SA复合凝胶微球的总体效能明显优于MN。结合笔者团队近期在UiO-66(Zr)绿色低成本批量制备方面的研究成果,UiO-66(Zr)/SA复合凝胶微球可作为一种水中As(V)深度净化的潜在新材料。
In this work,the synthesis of metal-organic framework UiO-66(Zr)/solidum alginate(SA)composite microspheres and its adsorptive removal of As(V)from water were reported.The effects of the addition of UiO-66(Zr)powder and the drying method of the aerogel microspheres on the shaping structure and adsorption performances were comprehensively investigated by scanning electron microscopy(SEM),X-ray diffraction(XRD),nitrogen sorption and adsorption test.UiO-66(Zr)/SA microspheres with the optimal physicochemical properties were obtained by mixing 50wt%powdery UiO-66(Zr),followed by flash freezing dry method.Their adsorption behaviors over As(V)were further explored and compared with a commercial arsenic removal material MN.The results indicate that,the maximum adsorption capacity of the microspheres(18.65 mg/g)is achieved at pH=7.0 with an initial As(V)concentration of 20 mg/L under static adsoption conditon.The results of breakthrough experiment show that the microspheres material containing 1.0 g UiO-66(Zr)can treat at least 1.2 L solution with the As(V)concentration of 100μg/L,ensuring the effluent concentration below 10μg/L.The overall performance of UiO-66(Zr)/SA microspheres was superior to MN.Considering the showcase of green and low-cost batch preparation of UiO-66(Zr)reported by the author’s team recently,the UiO-66(Zr)/SA microspheres can be used as a potential sorbent for the deep purification of As(V)in water.
作者
马慧
方月
吴一楠
李风亭
MA Hui;FANG Yue;WU Yi’nan;LI Fengting(State Key Laboratory of Pollution Control and Resource Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China;Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2022年第20期59-65,共7页
Materials Reports
基金
国家自然科学基金(21777119)
上海市国际科技合作基金项目(18230742300,20230712200)。
