In2S3/g-C3N4复合光催化剂的制备及其光催化降解四环素

本文分别采用热缩聚法和水热法合成了g-C₃N₄和In₂S₃,再用简单的机械研磨工艺制备出了In₂S₃/g-C₃N₄复合光催化剂。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶变换红外光谱(FTIR)和紫外可见漫反射光谱(UV-Vis DRS)对In₂S₃/g-C₃N₄复合光催化剂的晶体结构、形貌、微观结构和光学性质进行了表征,在可见光照射下,通过降解四环素(TC)来评价其光催化活性。结果表明,研磨比例为1∶4(摩尔比)的In₂S₃/g-C₃N₄复合光催化剂表现出最佳的光催化性能,在氙灯下TC的光降解表观速率常数是0.025 1 min^-1,分别是In₂S₃和g-C₃N₄的2.9倍和1.6倍,在自然光下TC的光降解表观速率常数是0.010 4 min^-1,分别是In₂S₃和g-C₃N₄的2.6倍和1.4倍。In₂S₃/g-C₃N₄复合光催化剂优异的光催化性能归功于载流子的高效迁移和分离以及增强的光吸收能力。本研究为设计和开发用于抗生素废水处理的可见光响应光催化剂提供了一条有前景的途径。

Preparation of In2S3/g-C3N4 Composite Photocatalyst and Its Photocatalytic Degradation of Tetracycline

In this paper, g-C₃N₄ and In₂S₃ were synthesized by thermal polycondensation and hydrothermal method, respectively. In₂S₃/g-C₃N₄ composite photocatalyst was prepared by simple mechanical grinding technology. The crystallographic structure, morphology, microstructure and optical properties of In₂S₃/g-C₃N₄ composite photocatalyst were characterized by X-ray diffraction (XRD), scanning electron microscope(SEM), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR), and UV visible diffuse reflectance spectrum (UV-Vis DRS). The photocatalytic activity was evaluated by degradation of tetracycline (TC) under visible light irradiation. The results show that the In₂S₃/g-C₃N₄ composite photocatalyst with grinding molar ratio of 1∶4 displays the best photocatalytic activity. The observed rate constant of TC degradation under xenon lamp is 0.025 1 min^-1, which is 2.9 times and 1.6 times higher than that of In₂S₃ and g-C₃N₄, respectively. The observed rate constant of TC degradation under natural light is 0.010 4 min^-1, which is 2.6 times and 1.4 times higher than that of In₂S₃ and g-C₃N₄, respectively. The superior photocatalytic performance of In₂S₃/g-C₃N₄ composite photocatalyst is attributed to the efficient migration and separation of charge carriers and the enhanced light absorption capacity. This paper provides a promising approach for designing and developing visible-light-response photocatalysts applied to antibiotic wastewater treatment.