研究目的
To assess the effects of protonation, hydroxylamination, and hydrazination of g-C3N4 on the gas separation performance of Matrimid?/g-C3N4 mixed matrix membranes for CO2/CH4 and O2/N2 separation.
研究成果
Chemically modified g-C3N4 fillers, particularly protonated and hydroxylaminated versions, significantly enhance the gas separation performance of Matrimid? membranes, with up to 52.2% increase in CO2/CH4 selectivity and 26.3% increase in O2/N2 selectivity. These modifications improve interfacial interactions and thermal stability, suggesting promise for application in membrane technology for gas separation.
研究不足
The study used low filler loadings (0.5 wt% and 2 wt%) to avoid inhomogeneity and mechanical instability; higher loadings led to agglomeration. Hydrazination showed lower enhancements, and some modifications (e.g., N–OH groups) were not clearly detected in FTIR due to low doses. The research is limited to laboratory-scale membranes and specific gas pairs (CO2/CH4 and O2/N2).
1：Experimental Design and Method Selection:
The study involved synthesizing and modifying g-C3N4 fillers (protonation, oxygen plasma treatment, hydrazination) and incorporating them into Matrimid? matrices to form mixed matrix membranes (MMMs). Methods included thermal oxidation, ultrasonic treatment, plasma treatment, and membrane casting.
2：Sample Selection and Data Sources:
Materials used were Matrimid? 5218 polymer, melamine cyanurate, DMAc solvent, hydrazine monohydrate, and HCl. Samples were prepared with
3：5 wt% and 2 wt% filler loadings. List of Experimental Equipment and Materials:
Equipment included Vycor? glass vial, Branson Sonifier 450 sonicator, Harrick Plasma PDC-002 apparatus, Thermo Scientific Nicolet iS50 FTIR spectrometer, FEI QUANTA 200F FESEM, Mettler Toledo DMA/SDTA 861 TG analyzer, Fischer Dualscope MP0R thickness gauge, and an isochoric permeation system for gas separation tests. Materials included chemicals from Sigma-Aldrich and Ferro-plast S.r.l.
4：Experimental Procedures and Operational Workflow:
Synthesis of g-C3N4 via thermal oxidation, modification treatments (protonation with HCl, oxygen plasma treatment, hydrazination), preparation of MMMs by casting method with solvent evaporation and thermal treatment, characterization using FTIR, SEM, TG, and gas permeation tests at 35°C and 3 bar feed pressure.
5：Data Analysis Methods:
Permeability calculated using Equation (1), selectivity using Equation (2); data averaged from multiple samples with variability analysis.
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