为克服氮化碳在光催化过程中光生载流子复合率高、催化活性低的不足,将具有“电子海绵”特性的十聚钨酸盐和二价铜离子与富含N、O元素的氮化碳材料相结合,设计了一种新型复合材料W10/Cu/g-C3N4。通过傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)等多种表征手段,对W10/Cu/g-C3N4的组成、结构进行了详细分析。同时,在3-甲氧基苄醇氧化制备3-甲氧基苯甲醛的模型反应中,对其光催化性能进行了考察。结果表明:在光照条件下,以乙腈作为溶剂,光催化3-甲氧基苄醇的转化率为91%,3-甲氧基苯甲醛的选择性为92.3%。在优化条件下,该催化剂对7种不同底物进行了拓展实验,产率为64%～88%。此外,循环实验证明了催化剂较好的稳定性。可为制备具有光催化氧化功能的双金属离子复合材料提供有价值的参考数据和思路。
To address the shortcomings of carbon nitride materials in photocatalysis,specifically their propensity for photogenerated carrier recombination and low catalytic activity,a novel composite material,W10/Cu/g-C3N4,was designed by assembling decatungstate with “electron sponge” properties and divalent copper ions with carbon nitride rich in N and O elements.The composition and structure of W10/Cu/g-C3N4 were analyzed in detail using various characterization techniques,including Fourier transform infrared spectroscopy (IR) and scanning electron microscopy (SEM).Additionally,its photocatalytic performance was evaluated in a model reaction for the oxidation of 3-methoxybenzyl alcohol to 3-methoxybenzaldehyde.The results indicated that under light irradiation using acetonitrile as the solvent,the photocatalytic conversion rate of methoxybenzyl alcohol reached 91% and the selectivity for 3-methoxybenzaldehyde was 92.3%.Under optimized conditions,the catalyst was tested on seven substrates,yielding products in the range of 64%～88%.Furthermore,recycling experiments demonstrated the catalyst's stability and reproducibility.This study provides valuable reference data for the preparation of bimetallic ion composite materials with photocatalytic oxidation functionality.
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基金资助
国家自然科学基金(22261042);内蒙古自治区直属高校基本科研业务费项目GXKY22165);内蒙古民族大学博士科研启动基金项目(BS445);2022年内蒙古自治区教育科学规划课题项目(NGJGH2022274);2023年内蒙古自治区教育科学规划课题项目(NGJGH2023107);内蒙古自治区直属高校基本科研业务费项目(GXKY22165和GXKY23Z078)
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