Metal organic framework-derived CuO/Cu2O polyhedron-CdS quantum dots double Z-scheme heterostructure for cathodic photoelectrochemical detection of Hg2+ in food and environment,Food Chemistry

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Metal organic framework-derived CuO/Cu2O polyhedron-CdS quantum dots double Z-scheme heterostructure for cathodic photoelectrochemical detection of Hg2+ in food and environment
Food Chemistry ( IF 8.5 ) Pub Date : 2024-04-09 , DOI: 10.1016/j.foodchem.2024.139261
Leixia Meng ₁ , Yu Zhang ₁ , Jinlong Wang ₁ , Bingxin Zhou ₂ , Jianjun Shi ₃ , Huawei Zhang ₄

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This study employed an innovative copper oxide/cuprous oxide (CuO/CuO) polyhedron‑cadmium sulphide quantum dots (CdS QDs) double -scheme heterostructure as a matrix for the cathodic PEC determination of mercury ions (Hg). First, the CuO/CuO polyhedral composite was prepared by calcining a copper-based metal organic framework (Cu-MOF). Subsequently, the amino-modified CuO/CuO was integrated with mercaptopropionic acid (MPA)-capped CdS QDs to form a CuO/CuO polyhedron-CdS QDs double -scheme heterostructure, producing a strong cathodic photocurrent. Importantly, this heterostructure exhibited a specifically reduced photocurrent for Hg when using CdS QDs as Hg-recognition probe. This was attributed to the extreme destruction of the double -scheme heterostructure and the in situ formation of the CuO/CuO-CdS/HgS heterostructure. Besides, p-type HgS competed with the matrix for electron acceptors, further decreasing the photocurrent. Consequently, Hg was sensitively assayed, with a low detection limit (0.11 pM). The as-prepared PEC sensor was also used to analyse Hg in food and the environment.

中文翻译：

金属有机骨架衍生的CuO/Cu2O多面体-CdS量子点双Z型异质结用于食品和环境中Hg2+的阴极光电化学检测

本研究采用创新的氧化铜/氧化亚铜 (CuO/CuO) 多面体硫化镉量子点 (CdS QD) 双方案异质结构作为阴极 PEC 测定汞离子 (Hg) 的基质。首先，通过煅烧铜基金属有机骨架（Cu-MOF）制备了CuO/CuO多面体复合材料。随后，氨基修饰的CuO/CuO与巯基丙酸（MPA）封端的CdS量子点集成，形成CuO/CuO多面体-CdS量子点双方案异质结构，产生强阴极光电流。重要的是，当使用 CdS QD 作为 Hg 识别探针时，这种异质结构对 Hg 表现出明显降低的光电流。这归因于双方案异质结构的极度破坏和CuO/CuO-CdS/HgS异质结构的原位形成。此外，p型HgS与基质竞争电子受体，进一步降低了光电流。因此，Hg 的检测灵敏度较低，检测限较低 (0.11 pM)。所制备的 PEC 传感器还用于分析食品和环境中的汞。

更新日期：2024-04-09

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