CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry , University of Science & Technology of China , Hefei , 230026 , China.
Department of Municipal Engineering , Hefei University of Technology , Hefei , 230009 , China.
Anal Chem. 2018 Mar 6;90(5):3165-3173. doi: 10.1021/acs.analchem.7b04466. Epub 2018 Feb 23.
Noble metals, nanostructured carbon, and their hybrids are widely used for electrochemical detection of persistent organic pollutants. However, despite of the rapid detection process and high accuracy, these materials generally suffer from high costs, metallic impurity, heterogeneity, irreversible adsorption and poor sensitivity. Herein, the high-energy {001}-exposed TiO single crystals with specific inorganic-framework molecular recognition ability was prepared as the electrode material to detect bisphenol A (BPA), a typical and widely present organic pollutant in the environment. The oxidation peak current was linearly correlated to the BPA concentration from 10.0 nM to 20.0 μM ( R = 0.9987), with a low detection limit of 3.0 nM (S/N = 3). Furthermore, it exhibited excellent discriminating ability, high anti-interference capacity, and good long-term stability. Its good performance for BPA detection in real environmental samples, including tap water, lake and river waters, domestic wastewater, and municipal sludge, was also demonstrated. This work extends the applications of TiO semiconductor and suggests that this material could be used as a highly active, stable, low-cost, and environmentally benign electrode material for electrochemical sensing.
贵金属、纳米结构碳及其混合物被广泛用于持久性有机污染物的电化学检测。然而，尽管这些材料具有快速检测过程和高准确性，但它们通常存在成本高、金属杂质、异质性、不可逆吸附和灵敏度差等问题。在此，我们制备了具有特定无机框架分子识别能力的高能 {001}-暴露 TiO 单晶作为电极材料，用于检测双酚 A（BPA），这是环境中一种典型且广泛存在的有机污染物。氧化峰电流与 BPA 浓度在 10.0 nM 至 20.0 μM 范围内呈线性相关（R = 0.9987），检测限低至 3.0 nM（S/N = 3）。此外，它还表现出优异的区分能力、高抗干扰能力和良好的长期稳定性。该方法还展示了其在实际环境样品（包括自来水、湖泊和河流水、生活污水和城市污泥）中检测 BPA 的良好性能。这项工作扩展了 TiO 半导体的应用，并表明该材料可用作电化学传感的一种高活性、稳定、低成本且环境友好的电极材料。
