Fe-BTC表面氨基化及对染料和重金属离子的吸附性能研究
收稿日期: 2019-03-25
修回日期: 2019-04-14
网络出版日期: 2019-04-24
基金资助
中央高校基本科研业务专项资金项目(No.182410001);国家级大学生创新创业训练计划项目(No.201910145028)
Study on Amination Modification of Fe-BTC and Their Adsorption for Dyes and Heavy Metal Ions
Received date: 2019-03-25
Revised date: 2019-04-14
Online published: 2019-04-24
Supported by
Fundamental Research Funds for the Central Universities(No.182410001);National Undergraduate Innovation and Entrepreneurship Training Program(No.201910145028)
利用二乙烯三胺(DETA)对Fe-BTC结构进行改性，并系统研究了其对刚果红(CR)和重金属离子Pb(II)的吸附性能。应用SEM、XRD、Fourier变换红外光谱仪(FT-IR)、N2吸附-解吸实验、Zeta电位测定等方法对改性前后的Fe-BTC材料进行结构和表面性质表征。结果表明，在保持Fe-BTC晶体结构的前提下，DETA的掺杂可有效增加Fe-BTC表面—NH2并改变其表面的电性。在对CR和Pb(II)的吸附实验中，DETA-Fe-BTC对CR和Pb(Ⅱ)的吸附量明显提高，对比实验证明了DETA-Fe-BTC对于CR和Pb(II)的吸附选择性。对吸附条件进行了优化并对于吸附的热力学和动力学数据进行了拟合。在循环吸附脱附实验中，DETA-Fe-BTC表现出对于CR和Pb(II)优秀的吸附性能稳定性。
曹梦薇 , 蔡桃 , 张霞 . Fe-BTC表面氨基化及对染料和重金属离子的吸附性能研究[J]. 金属学报, 2019 , 55(7) : 821 -830 . DOI: 10.11900/0412.1961.2019.00079
The efficient removal of synthetic organics and metal ions from wastewater is an urgent target in the environment remedy. Metal-organic frameworks (MOFs) have received extensive attention owing to their large surface area, tunable pore size and versatile composition of metal and organic ligand, which have presented potential applications in the adsorption/separation of gas, metal ions and also organic dyes. Furthermore, the surface functionalization with some special groups has been proved to be effective in improving the adsorption activity and selectivity. In this work, the diethylenetriamine (DETA) was used to modify the Fe-BTC, and then their adsorption properties toward Congo red (CR) and Pb(II) were studied systematically. SEM, XRD, Fourier transform infrared spectroscopy (FT-IR), N2 adsorption-desorption experiments and Zeta potential measurements were employed to characterize the structure and surface properties of these modified Fe-BTC materials. The results showed that the incorporation of DETA maintained the crystal structure of Fe-BTC as while as effectively increased the surface—NH2 group and also changed the surface charge properties. In the adsorption experiments of CR and Pb(II), the adsorption capacity on the DETA-Fe-BTC was significantly increased compared to that on original Fe-BTC, the adsorption conditions were optimized and the adsorption thermodynamics were analyzed. The adsorption selectivity of DETA-BTC for CR and Pb(II) was also determined through the contrast experiments. In the cyclic adsorption experiments, the DETA-Fe-BTC also exhibited the excellent adsorption stability for CR and Pb(II).
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