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Xiaocui Han,Jianrui Zhang,Cheng Yue,Jinhui Pang,Haibo Zhang,Zhenhua Jiang 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.91 No.-
The gas separation of polymers of intrinsic microporosity (PIMs) was enhanced by incorporatingbipyrimidine (bpy) into the polymer (PIM-bpy-x) through the polycondensation of a novel tetraphenyl-bipyrimidine monomer. The structures of PIM-bpy-x were investigated with 1H NMR and FT-IR. Becauseof the excellent heat resistance imparted by the tetraphenyl-bipyrimidine unit, PIM-bpy-x displayedbetter thermal stability than did PIM-1. These polymers displayed large Brunauer-Emmett-Teller (BET)surface areas, ranging from 656 to 728 m2 g 1. The BET surface area of PIM-bpy-5 was 728 m2 g 1, whichwas similar to that of PIM-1 (774 m2 g 1). PIM-bpy-x exhibited excellent gas separation performance. PIM-bpy-5 showed the highest CO2 permeability (5141 barrer), which was much higher than that of PIM-1 (4234 barrer). The increase in CO2 permeability is due to the affinity between the N-rich bipyrimidineunits and CO2. Furthermore, PIM-bpy-x also showed greater resistance to aging than did PIM-1. All of theabove indicate that introducing bipyrimidine units into the polymers can enhance the gas separationperformance of PIMs.
Jie Zhang,Ben Dong,Ying Han,Xiaocui Zhan,Sijie Ge,Shilong He 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.3
In this paper, Cobalt-doped α-MnO2 (i.e., Co-α-MnO2) were synthesized through hydrothermal method. Phenol was employed as targeted pollutants to investigate the catalytic ozonation performance of Co-α-MnO2. Results showed that Co-α-MnO2 significantly improved the phenol removal increased to 97.47 % after 40 min, which was 16.46 %, 38.92 % higher than that of α-MnO2 catalytic ozonation and single ozonation without catalyst. Additionally, the physicochemical properties of α-MnO2 and Co-α-MnO2 were analyzed using technologies such as XRD, TEM, BET and XPS. Compared to α-MnO2, Co-α-MnO2 has larger specific surface area (79.496 m2/g) and pore volume (0.0396 cm3/g), higher Mn3+ relative content (41.16 %) and adsorbed oxygen content (18.99 %). Also, the oxygen vacancy content, lattice defect content and surface hydroxyl content of Co-α-MnO2 are higher than that of α-MnO2, which could result in higher catalytic oxidation performance of Co-α-MnO2. The influence of masking agent showed that surface hydroxyl group, •OH and •O2− were involved in the catalytic ozonation of phenol. This study could help recognize the role of surface hydroxyl groups and active free radicals and demonstrate the contribution of reactive oxygen species on phenol removal in Co-α-MnO2 systems.