College of Chemistry, Green Catalysis Center, Zhengzhou University, Zhengzhou, 450001, PR China.
Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450001, PR China.
Anal Chim Acta. 2023 Sep 22;1275:341579. doi: 10.1016/j.aca.2023.341579. Epub 2023 Jul 7.
Due to widespread application of chlorpyrifos for controlling pests in agriculture, the continuous accumulation of chlorpyrifos residue has caused serious environmental pollution.The detection of chlorpyrifos is of great significance for humans and environment because it can arise a series of diseases by inhibiting acetylcholinesterase (AChE) activity. Photoelectrochemical sensing, as an emerging sensing technology, has great potential in the detection of chlorpyrifos. It is urgent that find a suitable photoelectric sensing strategy to effectively monitor chlorpyrifos. Herein, an n-n heterojunction was constructed by uniformly immobilizing n-type 3DBiOI, which had loose porous structure composed of numerous small and thin nanosheets, on the surface of TiO with anatase/rutile (AR-TiO) heterophase junction. Under light irradiation, the proposed BiOI/AR-TiO n-n heterojunction exhibited excellent optical absorption characteristics and photoelectrochemical activity. Additionally, the photoelectrochemical sensing platform demonstrated excellent analytical performance in monitoring chlorpyrifos. Under optimized conditions, it showed a wide detection range of 1 pg mL- 200 ng mL and a detection limit (S/N = 3) as low as 0.24 pg mL, with superior selectivity and stability. The ultra-sensitivity and great specificity for detection of chlorpyrifos can be ascribed to chelation between Bi (Ⅲ) and C=N and P=S bonds in chlorpyrifos, which had been confirmed in this work. Meanwhile, the PEC sensor also had potential application value for monitoring chlorpyrifos in water samples, lettuce and pitaya, which the recoveries of samples ranged from 96.9% to 104.7% with a relative standard deviation (RSD) of 1.11%-5.93%. This sensor provided a novel idea for constructing heterojunctions with high photoelectric conversion efficiency and had a high application prospect for the detection of chlorpyrifos and other structural analogues.
由于毒死蜱在农业中用于防治害虫的广泛应用，其不断积累的残留物造成了严重的环境污染。毒死蜱的检测对人类和环境具有重要意义，因为它可以通过抑制乙酰胆碱酯酶（AChE）的活性引起一系列疾病。光电化学传感作为一种新兴的传感技术，在毒死蜱的检测方面具有很大的潜力。迫切需要找到一种合适的光电传感策略来有效监测毒死蜱。在此，通过均匀地将具有疏松多孔结构的 n 型 3DBiOI 固定在具有锐钛矿/金红石（AR-TiO）异质结的 TiO2 表面上，构建了 n-n 异质结。在光照射下，所提出的 BiOI/AR-TiO n-n 异质结表现出优异的光学吸收特性和光电化学活性。此外，光电化学传感平台在监测毒死蜱方面表现出优异的分析性能。在优化条件下，它显示出 1 pg mL-200 ng mL 的宽检测范围和低至 0.24 pg mL 的检测限（S/N = 3），具有优异的选择性和稳定性。对毒死蜱的超高灵敏度和特异性检测归因于 Bi（Ⅲ）与 C=N 和 P=S 键之间的螯合作用，这在本工作中得到了证实。同时，PEC 传感器对水样、生菜和火龙果中毒死蜱的监测也具有潜在的应用价值，样品的回收率在 96.9%至 104.7%之间，相对标准偏差（RSD）为 1.11%-5.93%。该传感器为构建具有高光电转换效率的异质结提供了新的思路，在毒死蜱及其它结构类似物的检测方面具有很高的应用前景。
