Low-pressure ultraviolet photolysis of soil extracts based on magnetically separable TiO2/SiO2/Fe3O4 photocatalyst for the accurate detection of heavy metals in soil: A new and effective pretreatment method

文献类型： 外文期刊

第一作者： He, Renjie

作者： He, Renjie;Wang, Jiali;Wang, Xiaochan;Zhang, Shijie;Shi, Yujie;Lv, Cheng;Zhao, Guo;Ye, Wenshuai;Liu, Gang;Liu, Ning

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关键词： LPUV photolysis; TiO 2 /SiO 2 /Fe 3 O 4 photocatalyst; Square wave anodic stripping voltammetry; Heavy metals detection; Soil samples pretreatment

期刊名称：MICROCHEMICAL JOURNAL （ 影响因子：5.1； 五年影响因子：4.7 ）

ISSN： 0026-265X

年卷期： 2025 年 213 卷

页码：

收录情况： SCI

摘要： Organic matter in soil can form complexes with heavy metal ions (HMIs), leading to the formation of organically-bound heavy metals, which weakens the electroactivity of these HMIs and distorts square wave anodic stripping voltammetry (SWASV) signals, thus reducing the accuracy of electrochemical detection of HMIs in soil. In this study, an accurate and efficient pretreatment method was proposed to mitigate the interference of organic matter on electrochemical signals. The method utilized low-pressure ultraviolet (LPUV) light in combination with a magnetically separable TiO2/SiO2/Fe3O4 photocatalyst to disrupt the complexation between organic matter and HMIs, thereby restoring the electroactivity of organically-bound heavy metals. Optimization of the pretreatment parameters for the LPUV-TiO2/SiO2/Fe3O4 system was performed. The synthesized TiO2/SiO2/Fe3O4 photo-catalyst and the mechanism of electroactivity restoration were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible spectrophotometry (UV-Vis), and fluorescence spectroscopy (FS). The concentrations of Cd(II) and Pb(II) in real soil samples were analyzed using this pretreatment method, achieving accuracy rates of 98.4% and 93.7% for Cd(II) and Pb(II), respectively, demonstrating the practical feasibility of this method for environmental applications.

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