School of Physical Science and Engineering, Beijing Jiaotong University, Beijing 100091, China.
School of Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China.
Molecules. 2023 Jun 29;28(13):5098. doi: 10.3390/molecules28135098.
Utilization of semiconductor photocatalyst materials to degrade pollutants for addressing environmental pollution problems has become a research focus in recent years. In this work, a 2D/2D S-scheme crystalline carbon nitride (CCN)/BiOIO (BOI) van der Waals heterojunction was successfully constructed for effectively enhancing the degradation efficiency of antibiotic contaminant. The as-synthesized optimal CCN/BOI-3 sample exhibited the highest efficiency of 80% for the photo-degradation of tetracycline (TC, 20 mg/L) after 120 min visible light irradiation, which was significantly higher than that of pure CCN and BOI. The significant improvement in photocatalytic performance is mainly attributed to two aspects: (i) the 2D/2D van der Waals heterojunction can accelerate interface carriers' separation and transfer and afford sufficient active sites; (ii) the S-scheme heterojunction elevated the redox capacity of CCN/BOI, thus providing a driving force for the degradation reaction. The degradation pathways of TC for the CCN/BOI composite were investigated in detail by liquid chromatography-mass spectrometry (LC-MS) analysis. This work provides a design idea for the development of efficient photocatalysts based on the 2D/2D S-scheme van der Waals heterojunctions.
利用半导体光催化剂材料降解污染物以解决环境污染问题已成为近年来的研究热点。在这项工作中，成功构建了二维/二维 S 型结晶碳氮化物（CCN）/BiOIO（BOI）范德华异质结，以有效提高抗生素污染物的降解效率。所合成的最佳 CCN/BOI-3 样品在可见光照射 120 分钟后，对四环素（TC，20mg/L）的光降解效率最高可达 80%，明显高于纯 CCN 和 BOI。光催化性能的显著提高主要归因于两个方面：（i）二维/二维范德华异质结可以加速界面载流子的分离和转移，并提供足够的活性位点；（ii）S 型异质结提高了 CCN/BOI 的氧化还原能力，从而为降解反应提供了驱动力。通过液相色谱-质谱（LC-MS）分析详细研究了 CCN/BOI 复合材料对 TC 的降解途径。这项工作为基于二维/二维 S 型范德华异质结的高效光催化剂的开发提供了设计思路。
