HCDs@MIL-100(Fe)吸附剂的制备及其苯吸附性能研究
收稿日期: 2022-02-18
网络出版日期: 2022-05-07
基金资助
山西省应用基础研究计划重点自然基金项目(201901D111003(ZD)); 山西浙大新材料与化工研究院研发项目(2021SX-TD007)
Research on Preparation and Benzene Adsorption Performance of HCDs@MIL-100(Fe) Adsorbents
Received date: 2022-02-18
Online published: 2022-05-07
Supported by
Shanxi Province Science Foundation for Key Program(201901D111003(ZD)); Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering(2021SX-TD007)
苯是一种典型的挥发性有机物, 对环境和人体都有较大的危害. 金属有机骨架(MOFs)在吸附挥发性有机物的方面有良好的应用潜力, 但水的存在会降低MOFs的吸附能力. 本工作采用疏水性碳点(HCDs)与MIL-100(Fe)原位合成制备HCDs@MIL-100(Fe)-Cx复合材料, 提高苯的吸附性能. 结果表明, 疏水性碳点通过担载或嵌入的方式与MIL-100(Fe)复合, 复合后的材料比表面积显著增加且具备了多级孔; 协同吸附作用显著提高了材料对苯的吸附量、苯/水竞争吸附选择性以及疏水性, 在25 ℃下, 相对压力为0.9时, HCDs@MIL-100(Fe)-C1对苯的吸附容量是MIL-100(Fe)的2.9倍; HCDs@MIL-100(Fe)-C1对苯/水的竞争吸附选择性最高可达3.4, 而MIL-100(Fe)最高仅达2.4; 复合材料低浓度苯的捕获能力得到增强, HCDs@MIL-100(Fe)-C1的动态穿透时间是MIL-100(Fe)的1.4倍; 且具有良好的循环稳定性.
刘芳 , 潘婷婷 , 任秀蓉 , 鲍卫仁 , 王建成 , 胡江亮 . HCDs@MIL-100(Fe)吸附剂的制备及其苯吸附性能研究[J]. 化学学报, 2022 , 80(7) : 879 -887 . DOI: 10.6023/A22020074
Benzene is a typical volatile organic compound with high photochemical reaction activity, which can seriously harm the environment and human health. Adsorption is an effective method to remove volatile organic compounds (VOCs), and the core of the adsorption method is the development of adsorbents. The high specific surface area and pore volume of metal-organic frameworks (MOFs) make them useful in the field of VOCs adsorption. However, the presence of water lead to a decrease in the adsorption capacity of MOFs. In this work, hydrophobic carbon dots (HCDs)@MIL-100(Fe)-Cx composites were prepared by in situ synthesis of hydrophobic carbon dots with MIL-100(Fe) to improve their benzene adsorption performance. The composite adsorbents were characterized by powder X-ray diffraction (PXRD), N2 adsorption-desorption, thermal gravimetric (TG), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and transmission electron microscope (TEM), the static adsorption capacity of HCDs@MIL-100(Fe)-Cx for benzene and water was determined by gravimetric vapor adsorption analyzer, the dynamic adsorption performance of benzene was investigated by measuring the breakthrough curve of the fixed bed. The results showed that the HCDs were compounded with MIL-100(Fe) by loading or embedding, and the specific surface area of the compounded materials increased significantly and possessed hierarchical pores. The synergistic adsorption of HCDs and MIL-100(Fe) greatly enhanced the adsorption capacity of benzene and the competitive adsorption selectivity of benzene/water. At 25 ℃, when the relative pressure was 0.9, the benzene adsorption capacity of HCDs@MIL-100(Fe)-C1 was 2.9 times that of MIL-100(Fe). When the relative pressure was 0.1, the adsorption capacity of HCDs@MIL-100(Fe)-C1 for benzene was increased by 175.66 mg/g compared with MIL-100(Fe), while the adsorption capacity for water was only increased by 16.87 mg/g, and the competitive adsorption selectivity of HCDs@MIL-100(Fe)-C1 was up to 3.4, while the highest for MIL-100(Fe) was only 2.4. Water contact angle experiments confirmed that HCDs improved the hydrophobicity of MIL-100(Fe). The ability of the composite to capture low concentration of benzene was enhanced; the dynamic breakthrough time of HCDs@MIL-100(Fe)-C1 was 1.4 times that of MIL-100(Fe), and it has perfect cyclic stability. Therefore, HCDs@MIL-100(Fe)-Cx has reference significance for the preparation of adsorbents with high VOCs adsorption performance.
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