Abstract

A novel Ag₃PO₄/ZnO/diatomite composite photocatalyst was prepared by simple ultrasonic dispersion-precipitation method. The structure, composition, microstructure and optical properties of the catalysts were characterized by means of X-ray diffraction (XRD), fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), transmission electron microscope (TEM) and UV-vis diffuse reflectance spectra (UV-vis DRS). Moreover, the visible light catalytic performance of the catalyst was investigated with tetracycline hydrochloride (TC) as the degradation target. The results showed that the photocatalytic activity of Ag₃PO₄/ZnO/diatomite in the degradation of TC, which can reach 90.99% removal rate of 30 mg/L TC under visible light, was significantly better than that of monomer catalysts and Ag₃PO₄/ZnO catalyst. Meanwhile, it exhibited better stability compared with pure Ag₃PO₄. The improvement of visible light catalytic activity and stability of Ag₃PO₄/ZnO/diatomite is mainly attributed to the catalyst’s better adsorption capacity, wider spectral response range, more efficient photo-generated electrons and holes migration and less photocorrosion. The results of free radical trapping experiments show that the main active species of the reaction system are h⁺ and •O₂⁻.

中文翻译：

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高活性Ag 3 PO 4 / ZnO /硅藻土的制备及其可见光催化降解盐酸四环素的性能

摘要

通过简单的超声分散沉淀法制备了新型的Ag ₃ PO ₄ / ZnO /硅藻土复合光催化剂。通过X射线衍射（XRD），傅立叶变换红外光谱（FT-IR），X射线光电子能谱（XPS），扫描电子显微镜（SEM）对催化剂的结构，组成，微观结构和光学性质进行了表征。能量色散光谱仪（EDS），透射电子显微镜（TEM）和紫外可见漫反射光谱（UV-vis DRS）。此外，以盐酸四环素（TC）为降解目标，研究了催化剂的可见光催化性能。结果表明，Ag ₃ PO ₄的光催化活性/ ZnO /硅藻土对TC的降解，可见光下30 mg / L TC的去除率可达90.99％，明显优于单体催化剂和Ag ₃ PO ₄ / ZnO催化剂。同时，与纯Ag ₃ PO ₄相比，它表现出更好的稳定性。Ag ₃ PO ₄ / ZnO /硅藻土的可见光催化活性和稳定性的提高主要归因于该催化剂具有更好的吸附能力，更宽的光谱响应范围，更有效的光生电子和空穴迁移以及更少的光腐蚀。自由基捕获实验的结果表明，反应体系的主要活性物质为h ⁺和•O ₂ ⁻。