碘氧铋/二氧化钛纳米棒复合材料的制备及其对双酚A的光电化学检测

doi:10.11944/j.issn.1000-0518.2018.07.180005

摘要/Abstract

摘要：

采用简易的两步水热法在FTO导电玻璃表面合成碘氧铋/二氧化钛纳米棒(BiOI/TiO₂ NRAs)复合材料。通过扫描电子显微镜、X射线单晶衍射仪对该复合材料进行了表征,基于电流-时间法考察了其光电化学行为。 BiOI的负载不仅成功地将TiO₂的光吸收范围拓展到可见光区,同时二者结合形成的p-n异质结构有效地促进光生电子空穴分离,增强了光催化能力。基于该复合材料对双酚A的光催化氧化作用,建立了一种新型检测双酚A的方法。结果表明,420 nm可见光激发下,利用电流-时间法,在外加偏压为0.0 V时,光电流密度与双酚A浓度在0.0047~14.7 μmol/L范围内呈线性关系,检测限为0.93 nmol/L(S/N=3)。该传感器具有高的灵敏度、良好的稳定性及重现性,将其应用于塑料制品和牛奶中的双酚A检测,获得令人满意的结果,回收率为98.0%~107.1%。

关键词: 光电化学, 双酚A, 二氧化钛纳米棒, 碘氧铋

Abstract:

Iodine oxygen bismuth/titanium dioxide nanorod arrays(BiOI/TiO₂ NRAs) composite was synthesized in situ on fluorine-doped tin oxide-coated glass(FTO) substrate by simple two-step hydrothermal method. The composite was characterized by scanning electron microscope and X-ray diffraction. The photoelectrochemical(PEC) behaviors were studied using current-time curve. The combination of BiOI with TiO₂ NRAs extends effectively the adsorption of TiO₂ to visible region, and the formed p-n heterojunction could contribute to the spatial charge separation as well as the enhanced photocatalytic activity. The PEC sensing platform fabricated by using this composite was applied for detection of bisphenol A(BPA) via the oxidation of BPA by the consumption of photogenerated holes during PEC reaction. Under 420 nm irradiation, current-time curve was used for sensitive detection of BPA at applied potential of 0.0 V, a wide linear work range from 0.0047 to 14.7 μmol/L was obtained with a low detection limit of 0.93 nmol/L(S/N=3). The developed PEC sensor exhibits high sensitivity, good stability and reproducibility. This sensor was also used to evaluate the level of BPA in real samples with good recovery from 98.0% to 107.1%.

Key words: photoelectrochemical, bisphenol A, titanium dioxide nanorod arrays, Iodine oxygen bismuth

范珍珍, 范丽芳, 董川. 碘氧铋/二氧化钛纳米棒复合材料的制备及其对双酚A的光电化学检测[J]. 应用化学, 2018, 35(7): 834-841.

Zhenzhen FAN, Lifang FAN, Chuan DONG. Synthesis of Iodine Oxygen Bismuth/Titanium Dioxide Nanorod Arrays Composite and Photoelectrochemical Detection of Bisphenol A[J]. Chinese Journal of Applied Chemistry, 2018, 35(7): 834-841.

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