【摘要】 本工作设计了一款不含贵金属、宽光谱响应的异质结催化剂Cu₂（OH）₂CO₃/石墨相氮化碳（Cu/g-C₃N₄）,并考查了其对四环素（TC）的光催化降解性能。采用TEM、SEM、XRD、紫外-可见光谱、荧光光谱等分析手段对产物形貌、结构、光学性质等进行了表征。实验结果表明，引入的组分Cu₂（OH）₂CO₃一方面作为可见光和近红外光吸收材料赋予异质结对模拟太阳光的广谱响应性，另一方面与g-C₃N₄构成“Z型”异质结从而促进了光生电子-空穴的有效分离，提高了光能-化学能转化效率。Cu/g-C₃N₄（1∶4）异质结对TC降解的光催化性能最佳，一级反应速率常数达到0.017 6 min^-1,分别是Cu₂（OH）₂CO₃和g-C₃N₄的4倍和3.1倍，且具有优异的光催化稳定性。此外，本工作还提出了三种Cu/g-C₃N₄（1∶4）异质结光催化降解TC的可能路径。更多还原

【Abstract】 Awide-spectrum-driven Cu₂（OH）₂CO₃/g-C₃N₄（Cu/g-C₃N₄） heterojunction catalyst was designed and the photocatalytic tetracycline degradation was investigated in the present work. The morphologies, crystal phases, optical property and so on of the as-prepared photocatalysts were characterized by means of TEM, SEM, XRD, UV-visible light spectroscopy, photoluminescence spectroscopy, etc. Experimental results indicated that the component Cu₂（OH）₂CO₃ gave heterojunction a broad spectrum response to simulated sunlight due to its absorption of visible and near infrared light, and the consist of Z-scheme heterojunction with g-C₃N₄ enhanced photochemical energy conversion efficiency. Particularly, Cu/g-C₃N₄（1∶4） heterojunction showed the best photocatalytic activity towards TC degradation, including an one order reaction rate constant of 0.017 6 min^-1, which was 3 and 2.1 times higher than that of neat Cu₂（OH）₂CO₃ and g-C₃N₄, as well as perfect photocatalytic stability. Moreover, this work hypothesized three possible photocatalytic degradation pathways of TC over Cu/g-C₃N₄（1∶4） heterojunction.更多还原