The optimal ratio of the metal centers to the organic ligands was determined by optimizing the synthesis process of MOF-5.Based on the optimal ratio,Populus tomentosa wood/MOF-5 composite material was prepared by in situ synthesis of MOF-5 in the pore of Populus tomentosa by vacuum impregnation and hydrothermal synthesis.The morphology,binding mechanism,pore structure,and toluene adsorption property of the adsorbent material were characterized.The results showed that when the molar ratio of metal center to organic ligand was 1∶3,the synthesized MOF-5 crystals had a small particle size.The BET specific surface area was 268.729 m2/g,the pore volume was 0.136 cm3/g.MOF-5 crystals presented peak characteristics in the typical X-ray exam.The average loading value of MOF-5 synthesized in situ inside the pore of Populus tomentosa was 22.6%.The infrared spectroscopy test showed that MOF-5 was combined with Populus tomentosa through hydrogen bonding and electrostatic interactions.The pore structure tested by scanning electron microscopy,mercury intrusion porosimetry,and nitrogen adsorption and desorption showed that MOF-5 filled some of the macropores and mesopores in the Populus tomentosa,while increasing the specific surface area and pore volume of micropore.The maximum adsorption capacity of toluene was 16.07 cm3/g at normal temperature and pressure,and Populus tomentosa wood/MOF-5 composite material showed good toluene adsorption and desorption performance.Populus tomentosa wood/MOF-5 composite material demonstrated a good potential in gas adsorption and separation,which is a reference for promoting fast-growing wood as adsorbent material.
关键词
毛白杨木材/金属有机框架/孔径分布/甲苯吸附/功能化改性
Key words
Populus tomentosa wood/metal organic frameworks/pore size distribution/toluene adsorption/functional modification
维普
万方数据