吸附
热重分析
苯
材料科学
二氯甲烷
二甲苯
傅里叶变换红外光谱
扫描电子显微镜
试剂
聚合物
红外光谱学
接触角
溶剂
热稳定性
化学工程
高分子化学
有机化学
化学
复合材料
工程类
作者
Huan Liu,Zixin Liu,Hao-Ran Yu,Yan Wang,Fengyun Zhao,Jian-ying Wang
标识
DOI:10.1177/09540083221098159
摘要
Hyper-cross-linked polymers (HCPs) have been attracted widespread attention as adsorbents in recent years. A series of HCPs (HCP-1, HCP-2 and HCP-3) were synthesized via a Friedel-Crafts reaction using low-cross-linked pitch as precursor and dichloromethane (DCM) as cross-linking reagent and solvent. The prepared HCPs were characterized by N 2 adsorption, Fourier transform infrared (FI-IR), Scanning electron microscopy (SEM), Thermogravimetric analysis (TGA) and static water contact angle. The resultant HCPs possess micro/meso pore structures and a high stability. The Brunauer-Emmett-Teller (BET) surface areas of HCP-1, HCP-2 and HCP-3 are 152 m 2 ·g −1 , 467 m 2 ·g −1 and 447 m 2 ·g −1 , respectively. Their total pore volumes vary from 0.207 cm·g −1 to 0.545 cm 3 ·g −1 and following the sequence of HCP-1<HCP-3<HCP-2. The FTIR spectra of HCPs suggests the DCM is successfully grafted onto the skeleton structure. Dynamic adsorption capacities of the prepared HCP-1, HCP-2 and HCP-3 were examined and the results show the adsorption properties of o-xylene on HCP-2 are significantly higher than that of the other HCPs. The adsorption amount of o-xylene on HCP-2 is 198.18 mg·g −1 , which is higher than that of benzene, suggesting a strong adsorption selectivity for o-xylene over benzene. In addition, the effect of water vapor on the adsorption of o-xylene onto HCP-2 was investigated. The dynamic adsorption amount of o-xylene on HCP-2 decreases by 76.47% under the relative humidity (RH) of 30%, implying that the HCP-2 has poor hydrophobicity. The equilibrium adsorption capacity of o-xylene on HCP-2 shows a slight decline after five adsorption cycles. [Formula: see text]
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