Jin Dangqin, Xu Qin, Wang Yanjuan, Hu Xiaoya
College of Chemistry and Engineering, Yangzhou University, Yangzhou 225002, PR China; Department of Chemical Engineering, Yangzhou Polytechnic Institute, Yangzhou 225127, PR China.
College of Chemistry and Engineering, Yangzhou University, Yangzhou 225002, PR China.
Talanta. 2014 Sep;127:169-74. doi: 10.1016/j.talanta.2014.01.058. Epub 2014 Mar 24.
Nonelectroactive acetochlor can be indirectly determined through the photocatalytical degradation of acetochlor. A derivative visible light photoelectrochemical sensor for indirect detection of the herbicide acetochlor using TiO2-poly(3-hexylthiophene)-ionic liquid nanocomposite is constructed. Poly(3-hexylthiophene) (P3HT) was synthesized via chemical oxidative polymerization with anhydrous FeCl3 as oxidant, 3-hexylthiophene as monomer, chloroform as solvent, and the functional TiO2 nanoparticles were facilely prepared by blending TiO2 nanoparticles and P3HT at room temperature ionic liquid, 1-Butyl-3-methylimidazolium hexafluorophosphate solution. Operational parameters, including the photolysis time, ratios of TiO2 to P3HT, bias voltage and pH of buffer solution have been optimized. Under optimal conditions, the proposed photoelectrochemical method could detect acetochlor ranging from 0.5 to 20 μmol L(-1) with a detection limit of 0.2 nmol L(-1) at a signal-to-noise ratio of 3. The assay results of acetochlor in water samples with the proposed method were in acceptable agreement with those of the gas chromatograph-mass spectrometer (GC-MS) method. The promising sensor opens a new opportunity for fast, portable, and sensitive analysis of acetochlor in environmental samples.
非电活性乙草胺可通过乙草胺的光催化降解间接测定。构建了一种基于TiO2-聚（3-己基噻吩）-离子液体纳米复合材料的用于间接检测除草剂乙草胺的衍生可见光光电化学传感器。以无水FeCl3为氧化剂、3-己基噻吩为单体、氯仿为溶剂，通过化学氧化聚合法合成聚（3-己基噻吩）（P3HT），并在室温离子液体1-丁基-3-甲基咪唑六氟磷酸盐溶液中，将TiO2纳米颗粒与P3HT混合，简便地制备了功能性TiO2纳米颗粒。对光解时间、TiO2与P3HT的比例、偏压和缓冲溶液的pH等操作参数进行了优化。在最佳条件下，所提出的光电化学方法能够检测0.5至20 μmol L(-1)范围内的乙草胺，在信噪比为3时检测限为0.2 nmol L(-1)。用该方法对水样中乙草胺的测定结果与气相色谱-质谱联用（GC-MS）法的结果具有可接受的一致性。该有前景的传感器为环境样品中乙草胺的快速、便携和灵敏分析提供了新机会。
