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ZIF-67 modified MXene/sepiolite composite membrane for oil–water separation and heavy metal removal
Qiuxiang Wang,Zongxue Yu,Ximei Zhu,Qingcan Xiang,Haidong Chen,Yao Pang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-
In this study, polyvinylpyrrolidone (PVP) was used as a cross-linking agent leading to ZIF-67 in-situ growon the surface of sepiolite (Sep) to increase the specific surface area and space volume of Sep. Subsequently, a hydrothermal synthesis method was used to form a stable super-hydrophilic compositemembrane from the composite MXene by polydopamine. Compared to the MXene/PDA/Sep (MPS) compositemembrane, the composite membrane with ZIF-67 exhibited improved hydrophilicity and heavymetal separation. In addition, the introduction of negatively charged Sep@ZIF-67–24 (SZ-24) increasedthe number of adsorption active sites and negative potential for the surface of the membrane, and thiswas conducive to the demulsification and adsorption of oil–water emulsions. The MXene/PDA/Sep@ZIF-67–1 (MSZ-1) composite membrane had excellent separation effects on surfactant-stabilizedemulsions (SSEs) and surfactant-free emulsions (SFEs) oil–water emulsions which were above 99.4 %. Furthermore, the separation effect on oil–water, under extreme water conditions, was greater than99 %. The MSZ-1 composite membrane can achieve excellent separation of heavy metal ions, especiallyCu2+ that the rejection was 79.9 %, under high flux and extreme conditions. Therefore, the MSZ-1 compositemembrane has broad application prospects in oil–water treatment and heavy metal separation.
Effects of solvent extraction on the microstructure of bituminous coal-based graphite
Wang Lipeng,Yao Zongxu,Guo Zhimin,Shen Xiaofeng,Li Zhiang,Zhou Zhengqi,Wang Yuling,Yang Jian-Guo 한국탄소학회 2022 Carbon Letters Vol.32 No.3
Coal-based graphite has become the main material of emerging industries. The microstructure of coal-based graphite plays an important role in its applications in many fields. In this paper, the effect of carbon disulfide/N-methyl-2-pyrrolidone solvent mixture extraction on the microstructure of bituminous coal-based graphite was systematically studied through preliminary extraction coupled with high-temperature graphitization. The graphitization degree g (75.65%) of the coal residue-based graphite was significantly higher than that of the raw coal-based graphite. The crystallite size La of the coal residue-based graphite was reduced by 47.06% compared with the raw coal-based graphite. The ID/ IG value of the coal residue-based graphite is smaller than that of the raw coal-based graphite. The specific surface area (16.72 m2/g) and total pore volume (0.0567 m3/g) of the coal residue-based graphite are increased in varying degrees compared with the raw coal-based graphite. This study found a carbon source that can be used to prepare coal-based graphite with high graphitization degree. The results are expected to provide a theoretical basis for further clean and efficient utilization of the coal residue resources.