In the present work, narrow band gap AgBr nano-particle decorated TiO₂ nanotubes arrays (AgBr/TiO₂ NTAs) photoelectrode was successfully fabricated through anodization, followed by ultrasonic assisted precipitation process. Subsequently, morphologies and chemical structures were investigated through scanning electron microscope (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). In addition, the optical and photoelectrochemical (PECH) properties were recorded through Ultraviolet–visible diffuse reflectance spectroscopy (UV–vis DRS), transient photocurrent density and Mott-Schottky measurements. Furthermore, the photocatalytic (PC) efficiency was evaluated through the yield of hydroxyl (OH) radicals and degradation of 4-CP under visible light illumination. All results indicated that as-fabricated AgBr/TiO₂ NTAs photoelectrode displayed superior PC performance, which was mainly ascribed to the intense visible light absorbance and high charge separation efficiency. Moreover, the intermediates and toxification change during PC degradation of 4-CP were elucidated according to the UPLC-MS/MS measurement and luminescent bacterial tests.

在本工作中，通过阳极氧化成功地制备了窄带隙AgBr纳米粒子修饰的TiO ₂纳米管阵列（AgBr / TiO ₂ NTAs）光电极，然后进行了超声辅助沉淀工艺。随后，通过扫描电子显微镜（SEM），X射线衍射（XRD）和X射线光电子能谱（XPS）研究了形貌和化学结构。此外，还通过紫外可见漫反射光谱（UV-vis DRS），瞬态光电流密度和Mott-Schottky测量来记录光学和光电化学（PECH）特性。此外，通过羟基（OH）自由基和4-CP在可见光照射下的降解。所有结果表明，所制备的AgBr / TiO ₂ NTAs光电极表现出优异的PC性能，这主要归因于强烈的可见光吸收和高电荷分离效率。此外，根据UPLC-MS / MS测量和发光细菌测试，阐明了4-CP在PC降解期间的中间体和毒性变化。