Exploring effective methods for tetracycline (TC) detection in soil has great significance because of its emerging environmental problem and increasing threat to soil quality and general public health worldwide. In this work, a sensitive photoelectrochemical (PEC) aptasensor toward TC detection was designed and constructed based on an efficient photosensitive material of Z-scheme CdTe-BiOBr heterojunction. Due to the sensitization of CdTe quantum dots (QDs) on the BiOBr nanoflowers, the photocurrent intensity of the CdTe-BiOBr heterojunction was enhanced about 5.0-fold and 8.0-fold than that of pure BiOBr and CdTe under visible-light irradiation, which was attributed to the low electron-hole combination efficiency, high visible light utilization efficiency, and high carrier density of the heterojunction. On the merits of the excellent PEC activity of the CdTe-BiOBr and the specificity of the aptamer, the proposed PEC aptasensor has the advantages of satisfying linear range (from 10 to 1500 pM), low detection limit (9.25 pM), good selectivity, and reproducibility. In addition, acceptable accuracy was obtained for TC detection in real soil sample, giving acceptable accuracy in comparison with the referenced high-performance liquid chromatography-diode array detector method, revealing a promising avenue for accurate and ultrasensitive estimation of other kinds of contaminants in the broad field of analysis.

探索土壤中四环素 (TC) 检测的有效方法具有重要意义，因为其正在出现的环境问题以及对全球土壤质量和公众健康的威胁日益增加。在这项工作中，基于 Z 型 CdTe-BiOBr 异质结的高效光敏材料，设计并构建了一种用于 TC 检测的灵敏光电化学 (PEC) 适体传感器。由于BiOBr纳米花上CdTe量子点（QDs）的敏化作用，在可见光照射下，CdTe-BiOBr异质结的光电流强度比纯BiOBr和CdTe分别提高了约5.0倍和8.0倍。归因于异质结的低电子 - 空穴结合效率，高可见光利用效率和高载流子密度。基于 CdTe-BiOBr 优异的 PEC 活性和适体的特异性，所提出的 PEC 适体传感器具有满足线性范围（10 至 1500 pM）、低检测限（9.25 pM）、良好的选择性、和再现性。此外，在实际土壤样品中的 TC 检测获得了可接受的准确度，与参考的高效液相色谱 - 二极管阵列检测器方法相比，其准确度可接受，为准确和超灵敏地估计土壤中其他种类的污染物提供了一条有希望的途径。广泛的分析领域。