金属有机框架化合物NH_(2)-MIL-101(Cr)对铅(Ⅱ)的吸附性能研究  

Study on adsorptive property of Pb(Ⅱ)by metal-organic frameworks NH_(2)-MIL-101(Cr)

作　　者：范文娟[1] 常会[1] FAN Wenjuan;CHANG Hui(College of Biology&Chemical Engineering,Panzhihua University,Panzhihua 617000,China)

机构地区：[1]攀枝花学院生物与化学工程学院,四川攀枝花617000

出　　处：《冶金分析》2022年第8期81-86,共6页Metallurgical Analysis

基　　金：钒钛资源综合利用四川省重点实验室(2020FTSZ10);大学生创新训练项目(2021cxcy071,2021cxcy074)。

摘　　要：通过溶剂热法,制备出金属有机框架化合物NH_(2)-MIL-101(Cr)。使用X射线衍射仪(XRD)、场发射扫描电子显微镜(SEM)和全自动比表面积及微孔物理吸附和化学吸附分析仪对NH_(2)-MIL-101(Cr)的晶相结构、微观形貌和比表面积进行表征。结果表明,制备的NH_(2)-MIL-101(Cr)为正八面体形貌,比表面积高达1656 m^(2)/g。使用NH_(2)-MIL-101(Cr)对水体中Pb(Ⅱ)进行吸附,结果表明:在30 mg/L含Pb(Ⅱ)溶液中,加入0.03 g NH_(2)-MIL-101(Cr)吸附剂,振荡吸附100 min,达到吸附平衡,平衡吸附量为49.84 mg/g。NH_(2)-MIL-101(Cr)对Pb(Ⅱ)的吸附过程满足拟二级动力学和Langmuir吸附等温模型,说明NH_(2)-MIL-101(Cr)表面活性吸附位点分布均匀,对Pb(Ⅱ)的吸附属于均相单分子层化学吸附,实验饱和吸附量为71.25 mg/g。NH_(2)-MIL-101(Cr)吸附材料利用EDTA再生使用6次后,吸附量仅下降20.97%,说明NH_(2)-MIL-101(Cr)具有较好的再生循环使用性。取某电池车间经处理过的Pb(Ⅱ)质量浓度为30 mg/L的废水,加入0.03 g NH_(2)-MIL-101(Cr)吸附剂,控制pH值为6,振荡吸附100 min后,测定溶液中剩余的Pb(Ⅱ)质量浓度为0.1 mg/L(低于国家最高排放标准0.5 mg/L),说明NH_(2)-MIL-101(Cr)是一种良好的Pb(Ⅱ)去除剂。The metal-organic frameworks,NH_(2)-MIL-101(Cr),were synthesized by solvothermal method.The crystal phase structure,microstructure morphology and specific surface area of NH_(2)-MIL-101(Cr)were characterized by X-ray diffractometer(XRD),scanning electron microscope(SEM),and fully automatic specific surface area and micropore physical and chemical adsorption analyzer.The results showed that NH_(2)-MIL-101(Cr)had an ortho-octahedral morphology with the specific surface area up to 1656 m^(2)/g.NH_(2)-MIL-101(Cr)was used for adsorption of Pb(Ⅱ)from an aqueous solution.The results showed that the adsorption equilibrium could be reached within 100 min under the following conditions:the mass concertation of Pb(Ⅱ)was 30 mg/L;the dosage of NH_(2)-MIL-101(Cr)was 0.03 g;the solution was shaken for adsorption.The equilibrium absorption capacity was 49.84 mg/g.The adsorption process of Pb(Ⅱ)by NH_(2)-MIL-101(Cr)conformed to the pseudo-second order kinetics and Langmuir isothermal adsorption model,which indicated that the active sites on surface of NH_(2)-MIL-101(Cr)were uniformly distributed.The adsorption of Pb(Ⅱ)belonged to homogeneous monolayer chemical process.The saturation adsorption capacity in experiments was 71.25 mg/g.The adsorption capacity of NH_(2)-MIL-101(Cr)only decreased by 20.97%after regeneration for 6 cycles using EDTA,indicating that NH_(2)-MIL-101(Cr)had excellent performance of regeneration.The wastewater containing 30 mg/L Pb(Ⅱ)was sampled from one battery plant.After adding 0.03 g of NH_(2)-MIL-101(Cr),the pH was adjusted to 6.The measured mass concentration of Pb(Ⅱ)was only 0.1 mg/L(which was lower than 0.5 mg/L in national maximum emission standard)after oscillation adsorption for 100 min,indicating that NH_(2)-MIL-101(Cr)was a good removal agent for Pb(Ⅱ).

关 键 词：金属有机框架化合物 NH_(2)-MIL-101(Cr) 铅(Ⅱ) 吸附 再生 废水 

分 类 号：O647.3[理学—物理化学] X703[理学—化学]