Hunan Province College Key Laboratory of Molecular Design and Green Chemistry, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, People's Republic of China.
Hunan Province College Key Laboratory of Molecular Design and Green Chemistry, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, People's Republic of China.
Anal Chim Acta. 2023 May 1;1253:341092. doi: 10.1016/j.aca.2023.341092. Epub 2023 Mar 13.
A porous bismuth oxyiodide-metal bismuth/nitrogen-doped carbon (BiOI-Bi/N-C) composite composed of BiOI nanosheets, N-C sheets, and metallic Bi nanoparticles was prepared. BiOI-Bi/N-C exhibited remarkable cathodic photoelectrochemical activity and rapid adsorption capacity for Cr(VI) ions. Interestingly, the photocatalytic process of BiOI-Bi/N-C toward Cr(VI) was pH dependent. Under acidic medium, the synthesized material displayed efficient photocatalysis and achieved 95.0% photoreduction efficacy for Cr(VI) ions to Cr within 30 min under visible light irradiation. Under neutral medium, Cr(VI) state showed a different photocatalytic process, and Cr(OH) as a product covered on BiOI-Bi/N-C, which decreased the electrochemical (EC) and photoelectrochemical (PEC) performance of BiOI-Bi/N-C. Based on the findings, BiOI-Bi/N-C was utilized as EC/PEC dual-model sensing interface for the detection of Cr(VI) ions. The presented dual-model sensing method displayed an ultralow limit of detection down to 6.8 pM for EC and 3.2 pM for PEC. It demonstrated the practical application potential for the assay of Cr(VI) in real samples.
一种由 BiOI 纳米片、N-C 片和金属 Bi 纳米颗粒组成的多孔铋氧碘化物-金属铋/氮掺杂碳（BiOI-Bi/N-C）复合材料被制备出来。BiOI-Bi/N-C 表现出显著的阴极光电化学活性和对 Cr(VI)离子的快速吸附能力。有趣的是，BiOI-Bi/N-C 对 Cr(VI)的光催化过程依赖于 pH 值。在酸性介质中，该合成材料在可见光照射下 30 分钟内对 Cr(VI)离子表现出高效的光催化作用，实现了 95.0%的 Cr(VI)还原为 Cr。在中性介质中，Cr(VI)状态呈现出不同的光催化过程，Cr(OH)作为产物覆盖在 BiOI-Bi/N-C 上，降低了 BiOI-Bi/N-C 的电化学（EC）和光电化学（PEC）性能。基于这些发现，BiOI-Bi/N-C 被用作 EC/PEC 双模式传感界面来检测 Cr(VI)离子。所提出的双模式传感方法在 EC 模式下的检测限低至 6.8 pM，在 PEC 模式下的检测限低至 3.2 pM。它展示了在实际样品中测定 Cr(VI)的实际应用潜力。
