碱金属掺杂MIL125的CO2 吸附性能

doi:10.11901/1005.3093.2022.504

材料研究学报

2023, Vol. 37

Issue (9): 649-654 DOI: 10.11901/1005.3093.2022.504

研究论文

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碱金属掺杂MIL125的CO₂ 吸附性能

宋莉芳, 闫佳豪, 张佃康, 薛程, 夏慧芸, 牛艳辉(

)

长安大学材料科学与工程学院交通铺面材料教育部工程研究中心西安 710064

Carbon Dioxide Adsorption Capacity of Alkali-metal Cation Dopped MIL125

SONG Lifang, YAN Jiahao, ZHANG Diankang, XUE Cheng, XIA Huiyun, NIU Yanhui(

)

Engineering Research Center of Transportation Materials, Ministry of Education, School of Materials Science and Engineering, Chang'an University, Xi'an 710064, China

引用本文:

宋莉芳, 闫佳豪, 张佃康, 薛程, 夏慧芸, 牛艳辉. 碱金属掺杂MIL125的CO₂ 吸附性能[J]. 材料研究学报, 2023, 37(9): 649-654.
Lifang SONG, Jiahao YAN, Diankang ZHANG, Cheng XUE, Huiyun XIA, Yanhui NIU. Carbon Dioxide Adsorption Capacity of Alkali-metal Cation Dopped MIL125[J]. Chinese Journal of Materials Research, 2023, 37(9): 649-654.

全文: PDF(10275 KB) HTML

摘要:

以对苯二甲酸和钛酸异丙酯为原料制备金属有机骨架化合物MIL125，然后用盐溶液后浸渍法制备出系列碱金属阳离子掺杂的M@MIL125-t(M: Li⁺，Na⁺，K⁺；t：6 h，9 h，12 h)。用傅立叶红外光谱、X射线衍射和场发射扫描电镜等手段表征其微观结构和形貌，进行N₂等温吸脱附和CO₂吸附测出其比表面积及CO₂吸附量，研究了不同碱金属盐浸渍液和浸渍时间对MIL125的比表面积和CO₂吸附能力的影响。结果表明，MIL125经碱金属氯盐溶液浸渍后其结构和晶型没有明显改变，浸渍液的表面腐蚀和孔道堵塞的共同作用使MIL125晶粒的比表面积均先增大后减小；与MIL125相比，掺杂Na⁺且浸渍9 h的比表面积(最高为2497 m²/g)，提高了81.5%，CO₂吸附量(为1.41 mmol/g)提高了72.0%。

关键词 ：无机非金属材料, 金属有机骨架, MIL125, 碱金属, CO₂吸附

Abstract：

The metal-organic skeleton compound MIL125 was prepared with terephthalic acid and isopropyl titanate as raw materials, afterwards by post impregnating in alkaline metal chloride solution, a series of alkali metal cation-doped M@MIL125-t (M: Li⁺, Na⁺, K⁺; t: 6 h, 9 h, 12 h) were obtained. They were characterized by X-ray diffractometer, Fourier transform infrared spectroscopy and field emission scanning electron microscopy. Their specific surface area and CO₂ adsorption capacity were assessed by nitrogen isothermal adsorption-desorption curve and CO₂ adsorption curve measurements. The results showed that being impregnated with alkali metal chloride solution, the structure and crystal form of MIL125 has not changed significantly. The surface and pores of MIL125 grain was corroded by the impregnation solution, and the specific surface area increased first and then decreased. The optimum impregnation time of MIL125 in the three alkali metal chloride solutions was 9 h. When doped with Na⁺ by impregnating for 9 h, the maximum specific surface area is up to 2497 m²/g, which is 81.5% higher than that of blank MIL125, and the CO₂ adsorption amount is 1.41 mmol/g, which is 72.0% higher than that of blank MIL125.

Key words： inorganic non-metallic materials metal organic frameworks MIL125 alkali metal CO₂ adsorption

收稿日期: 2022-09-19

ZTFLH:

TB333

基金资助:国家自然科学基金(51502021);大学生创新创业训练计划(X202210710585)

通讯作者: 牛艳辉，教授，niuyh@chd.edu.cn，研究方向为绿色智能材料

Corresponding author: NIU Yanhui, Tel: 18913730031, E-mail: niuyh@chd.edu.cn

作者简介: 宋莉芳，女，1980年生，副教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2022.504 或 https://www.cjmr.org/CN/Y2023/V37/I9/649

图1 MIL125和M@MIL125-t的FT-IR光谱

图2 MIL125和M@MIL125-t的XRD谱

图3 MIL125和M@MIL125-t的TG曲线

图4 MIL125，Li@MIL125-9和K@MIL125-9的SEM照片

图5 Na@MIL125-t的SEM照片

图6 K@MIL125-9的SEM-EDS图

图7 MIL125和M@MIL125-t的N2等温吸脱附曲线

图8 MIL125和M@MIL125-t的比表面积

图9 MIL125和M@MIL125-t的CO2吸附曲线

图10 CO2吸附量与MIL125、M@MIL125-t中SBET的关系

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