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为了进一步拓展MOF-5在光催化降解污染物方面的应用，本研究以MOF-5为原料，采用水解再生法使MOF-5水解并再生为一种新型、水稳定性好的双配体Zn-MOF(D-MOF)，同时将其与g-C_3N4耦合，制备出性能优异的光催化材料D-MOF/g-C_3N4(DMG)。通过X-射线粉末衍射、扫描电镜、紫外-可见漫反射、N2吸附-脱附等手段对复合材料DMG进行表征；采用光催化降解亚甲基蓝(MB)来研究复合材料的光催化活性，同时优化复合材料的最佳配比。结果表明：复合材料DMG有优异的光催化性能，经300 W氙灯照射60 min后对MB的降解率可达到92.79%，其降解速率分别是纯D-MOF和g-C_3N4的1.62倍和6.49倍，同时对复合材料DMG进行光催化机理试验并提出其光催化降解MB的可能机理。本研究为水稳定性较差的金属-有机框架材料的优化提供了一种新的思路。
Abstract：To further expand its application in photocatalytic degradation of pollutants, MOF-5 was hydrolyzed and regenerated into a new dual ligand Zn-MOF(D-MOF) with good water stability. After being coupled with g-C_3N4, a photocatalyst material D-MOF/g-C_3N4(DMG) with excellent performance was prepared. The composite materials of DMG was characterized through X-ray powder diffraction, scanning electron microscopy, UV-visible diffuse reflectance, N2adsorption-desorption, etc. The photocatalytic activity of DMG was investigated by photocatalytic degradation of methylene blue(MB). At the same time, the optimal ratio of DMG was optimized. The results showed that DMG had excellent photocatalytic performance. The degradation rate of MB could reach 92.79% after irradiation with a 300 W xenon lamp for 60 min, and its degradation rate was 1.62 and 6.49 times higher than that of pure D-MOF and g-C_3N4, respectively. The photocatalytic mechanism test of DMG was carried out and the possible photocatalytic degradation mechanism of MB was proposed. This study provides a new idea for the optimization of metal-organic framework materials with poor water stability.
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基本信息:
中图分类号:O643.36;O644.1;X703
引用信息:
[1]白怡航,齐少振,邹正丹,等.双配体Zn-MOF/g-C_3N_4复合材料的制备及光催化性能[J].塔里木大学学报,2023,35(01):67-75.
基金信息:
国家级大学生创新创业训练计划项目“g-C3N4/Zn-MOF复合材料的合成与光催化性能研究”（202010757023）; 塔里木大学校长基金其他项目“g-C3N4/M-TiO2纳米复合材料的制备”（TDZKYB202003）
2023-03-15
2023-03-15