The ecological environment and public safety are seriously threatened by the typical phenolic contaminant hydroquinone (HQ). Here, using a straightforward physical mixing technique, we created an n-n heterojunction by uniformly immobilizing cadmium sulfide (CdS) nanoparticles on the surface of a three-dimensionally layered, flower-like structure made of tin sulfide (SnS₂). Then, as photosensitizers, carbon nanotubes (CNTs) were added to the CdS/SnS₂ complex to create a type-II heterostructure of CdS/SnS₂/CNTs with synergistic effects. Subsequently, the detector HQ was bound to the modified photoelectrodes, which was accompanied by the hole oxidation of the bound HQ, leading to a significant increase in the photocurrent signal, thus allowing specific and sensitive detection of HQ. Under optimized detection conditions, the proposed photoelectrochemical sensor shows a wide detection range of 0.2 to 100 μM for HQ with a detection limit as low as 0.1 μM. The high accuracy of the sensor was demonstrated by comparison with the detection results of UV-Vis spectrophotometry. In addition, the photoelectrochemical sensor exhibits good reproducibility, stability, selectivity, and specificity, providing a light-driven method to detect HQ.

典型的酚类污染物对苯二酚（HQ）严重威胁着生态环境和公共安全。_{在这里，我们使用直接的物理混合技术，通过将硫化镉 (CdS) 纳米粒子均匀地固定在由硫化锡 (SnS 2} )制成的三维层状花状结构的表面上，创建了 nn 异质结。然后，作为光敏剂，将碳纳米管 (CNT) 添加到 CdS/SnS _{2复合物中，以创建 CdS/SnS 2}的 II 型异质结构/具有协同效应的碳纳米管。随后，检测器 HQ 与修饰的光电极结合，伴随着结合的 HQ 的空穴氧化，导致光电流信号显着增加，从而实现 HQ 的特异性和灵敏检测。在优化的检测条件下，所提出的光电化学传感器对 HQ 显示出 0.2 至 100 μM 的宽检测范围，检测限低至 0.1 μM。通过与紫外-可见分光光度法检测结果的对比，证明了传感器的高精度。此外，光电化学传感器表现出良好的重现性、稳定性、选择性和特异性，为检测HQ提供了一种光驱动方法。