Institute of Environmental Science, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, Shanxi 030006, PR China.
Analytical Instrumentation Center, Institute of Coal Chemistry, CAS, Taiyuan 030001, PR China.
J Hazard Mater. 2023 Jan 5;441:129901. doi: 10.1016/j.jhazmat.2022.129901. Epub 2022 Sep 3.
In this work, an efficient and novel photoelectrochemical (PEC) aptasensor for 2,3',5,5'-tetrachlorobiphenyl (PCB72) was constructed based on CdTe@CdS core@shell quantum dots (CdTe@CdS QDs)-decorated TiO nanotubes (TiO NTs). CdTe@CdS QDs were prepared by the combination of CdTe and CdS with a proper lattice mismatch. Due to their large band offsets, core@shell QDs can reduce undesirable carrier recombination, significantly improving their charge separation efficiency. Then the synthesized CdTe@CdS QDs were modified on TiO NTs (CdTe@CdS QDs/TiO NTs) through electrostatic adsorption method. The as-prepared composites exhibit a wide visible light absorption range, good PEC activity and high photoelectric conversion efficiency. Also, the PEC aptasensor prepared via the immobilization of anti-PCB72 aptamer on the composites exhibits outstanding analytical performance with high sensitivity and specificity for PCB72 under visible-light irradiation, achieving a detection limit as low as 0.03 ng/L. It was also applied to detect PCB72 in four different real environmental samples with satisfactory results.
在这项工作中，构建了一种基于碲化镉@硫化镉（CdTe@CdS）核壳量子点（CdTe@CdS QDs）修饰的二氧化钛纳米管（TiO NTs）的高效新颖光电化学（PEC）适体传感器，用于检测 2,3',5,5'-四氯联苯（PCB72）。CdTe@CdS QDs 通过 CdTe 和 CdS 的适当晶格失配结合而成。由于它们具有较大的能带偏移，核壳 QDs 可以减少不良的载流子复合，显著提高它们的电荷分离效率。然后，通过静电吸附法将合成的 CdTe@CdS QDs 修饰在 TiO NTs 上（CdTe@CdS QDs/TiO NTs）。所制备的复合材料表现出宽的可见光吸收范围、良好的 PEC 活性和高光电转换效率。此外，通过将抗 PCB72 适体固定在复合材料上制备的 PEC 适体传感器在可见光照射下对 PCB72 具有出色的分析性能，具有高灵敏度和特异性，检测限低至 0.03ng/L。它还被应用于四种不同真实环境样品中 PCB72 的检测，结果令人满意。
