不同尺寸ZIF-8对U (VI)的吸附性能

引用本文: 田龙, 豆维新, 杨玮婷, 王成. 不同尺寸ZIF-8对U (VI)的吸附性能[J]. 应用化学, 2021, 38(1): 84-91. doi: 10.19894/j.issn.1000-0518.200294 shu

Citation: TIAN Long, DOU Wei-Xin, YANG Wei-Ting, WANG Cheng. Size Effect of ZIF-8 on the Adsorption of Uranium[J]. Chinese Journal of Applied Chemistry, 2021, 38(1): 84-91. doi: 10.19894/j.issn.1000-0518.200294 shu

不同尺寸ZIF-8对U (VI)的吸附性能

田龙 ^1,4, ,
豆维新 ^{2,
,} ,
杨玮婷 ^{2,
,} ,
王成 ^{1,3,
,}

1.
中国科学院长春应用化学研究所, 稀土资源利用国家重点实验室, 长春 130022;
2.
海南大学理学院, 热带岛屿资源先进材料教育部重点实验室, 海口 570228;
3.
天津理工大学新能源材料与低碳技术研究院, 天津 300384;
4.
中国科学院大学, 北京 100049

通讯作者: 豆维新,E-mail:1648214326@qq.com; 杨玮婷,E-mail:wyang@icems.kyoto-u.ac.jp; 王成,E-mail:cwang@tjut.edu.cn

基金项目:
国家重点研发计划（No.2017YFA0700104）、国家自然科学基金（No.21571170）和天津市自然科学基金（No.17JCZDJC000）资助

摘要: 以经典的金属有机骨架（MOFs）材料ZIF-8为吸附剂，研究尺寸效应对铀吸附性能的影响。通过3种方法合成不同粒径的ZIF-8，利用扫描电子显微镜（SEM）、X射线粉末衍射仪（XRD）、表面积与孔隙度分析仪等对其进行了表征，测试了相同条件下不同尺寸的ZIF-8对硝酸铀酰溶液中U （VI）吸附，分别对其吸附过程的动力学和吸附等温线进行了考察，并测试了材料的可重复利用性。结果表明，成功制备了高结晶性、高纯度的ZIF-8，产物形貌呈菱形十二面体，颗粒均匀，粒径分别为约50 nm、150 nm及2 μm；3种ZIF-8具有单一均匀的微孔结构和与粒径高度相关的比表面积；不同尺寸的ZIF-8均能快速吸附溶液中的U （VI），在室温pH=3下，在70 min左右时即可吸附初始质量浓度为200 mg/L的U （VI）溶液中90%以上U （VI）；其中较小尺寸（约50 nm）的ZIF-8吸附性能最好，单位质量ZIF-8吸附U （VI）的饱和吸附量达到520.26 mg/g；ZIF-8对U的吸附动力学上符合二级动力学方程，吸附等温线符合Langmuir模型，说明ZIF-8对U （VI）的捕获属于化学单层吸附；经过4个吸附-解吸循环后，3种尺寸的ZIF-8均依然保持了70%以上的去除率。

关键词:

尺寸效应
/ 纳米结构
/ ZIF-8
/ 铀吸附

English

Size Effect of ZIF-8 on the Adsorption of Uranium

TIAN Long ^1,4, ,
DOU Wei-Xin ^{2,
,} ,
YANG Wei-Ting ^{2,
,} ,
WANG Cheng ^{1,3,
,}

1.
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
2.
Key Laboratory of Advanced Materials of Tropical Island Resources, Ministry of Education, School of Science, Hainan University, Haikou 570228, China;
3.
Institute for New Energy Materials & Low-Carbon, Technologies Tianjin University of Technology, Tianjin, 300384, China;
4.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: DOU Wei-Xin, ; YANG Wei-Ting, ; WANG Cheng,

Received Date: 24 September 2020
Fund Project:
Supported by the National Key Research and Development Project (No.2017YFA0700104), the National Natural Science Foundation of China (No.21571170) and the Natural Science Foundation of Tianjin (No.17JCZDJC000)

Abstract: ZIF-8, a classical metal-organic frameworks (MOFs) material, was used as an adsorbent to study the effect of particle size on its uranium adsorption performance. ZIF-8 particles with different sizes were synthesized by three methods, and characterized by scanning electron microscope (SEM), X-ray powder diffraction (XRD), surface area and porosity analyzer. The adsorption of ZIF-8 particles with different sizes for U(VI) from uranyl nitrate solution was tested under the same conditions. The parameters of adsorption isotherm and kinetics were calculated. The results show that ZIF-8 with high crystallinity and high purity is successfully prepared. The morphology of the product is rhombic dodecahedron, and the sizes of the particles are about 50 nm, 150 nm and 2 μm with narrow distributions. The three samples have single uniform micropore structures and their BET surface areas are highly related to the particle size. All the ZIF-8 particles with different sizes can quickly adsorb 90% of U(VI) from the initial concentration of 200 mg/L of U(VI) solution in 70 min (at room temperature, pH=3).The particles with smaller size (about 50 nm) show better adsorption performance, and the saturated adsorption capacity reaches 520.26 mg/g. The adsorption kinetics conforms to the second order kinetic equation, and the adsorption isotherm conforms to the Langmuir model, which indicate that the adsorption for U(VI) of ZIF-8 belongs to chemical monolayer adsorption. After 4 cycles of adsorption and desorption, their removal rates for U(VI) are still above 70%.

Key words:

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

不同尺寸ZIF-8对U (VI)的吸附性能

通讯作者: 豆维新,E-mail:1648214326@qq.com; 杨玮婷,E-mail:wyang@icems.kyoto-u.ac.jp; 王成,E-mail:cwang@tjut.edu.cn

English

Size Effect of ZIF-8 on the Adsorption of Uranium

Corresponding author: DOU Wei-Xin, ; YANG Wei-Ting, ; WANG Cheng,

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

不同尺寸ZIF-8对U (VI)的吸附性能

通讯作者: 豆维新,E-mail:1648214326@qq.com; 杨玮婷,E-mail:wyang@icems.kyoto-u.ac.jp; 王成,E-mail:cwang@tjut.edu.cn

English

Size Effect of ZIF-8 on the Adsorption of Uranium

Corresponding author: DOU Wei-Xin, ; YANG Wei-Ting, ; WANG Cheng,

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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