Constituting fully integrated colorimetric analysis system for Fe(III) on multifunctional nitrogen-doped MoO3/cellulose paper.
Constituting fully integrated colorimetric analysis system for Fe(III) on multifunctional nitrogen-doped MoO3/cellulose paper.
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DOI：
10.1016/j.talanta.2017.12.069
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发表时间：
2018-04
期刊：
影响因子：
6.1
通讯作者：
Fan Lin;Jiabai Cai;Yuehai Li;Huiwu Yu;Shunxing Li
中科院分区：
文献类型：
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作者：
Fan Lin;Jiabai Cai;Yuehai Li;Huiwu Yu;Shunxing Li
以氨水和硫脲为前驱体，采用一步碳化法制备了掺氮MoO 3，并以丙烯酸树脂为固定剂将其固定在纤维素滤纸上。NMCP被设计为多功能纳米复合材料，即，用于Fe（III）预富集的固相吸附剂，用于铁物种转化和颜色干扰去除的光催化剂，以及用于Fe（III）测定的比色传感器。铁-腐殖酸络合物经沉淀后可转化为Fe（III）离子，消除有色有机物（如，在干扰金属离子（如Co（II）和Cd（II））共存下，Fe（III）选择性富集到NMCP上，然后通过羟胺和光还原转化为Fe（II），用于比色分析。克服了邻菲罗啉比色法的困难。最佳质量比的氮掺杂使MoO 3的光降解活性提高了2.02倍，也是P25-TiO 2的5.11倍。使用智能手机和图像处理软件通过灰度量化NMCP上的Fe（III）浓度，而不需要复杂的设备。基于多功能NMCP，提出了一种完全集成的视觉分析系统，适用于天然水中Fe（III）的现场检测。Fe（III）的线性范围为0.05 ~ 5 mg/L，相关系数R2为0.976，检出限为15 μg/L。
Using ammonium molybdate and thiourea as precursors, nitrogen-doped MoO3was produced by a one-step carbonization and then fixed into the cellulose filter paper (NMCP) with acrylic resin as a fixative. NMCP was designed as a multifunctional nanocomposite, i.e., solid phase adsorbent for Fe(III) preconcentration, photocatalyst for iron species transformation and color interference removal, and colorimetric sensor for Fe(III) determination. After photocatalysis, the complex of Fe-humic substances could be transformed into Fe(III) ions, the interference of colored organic matter (e.g., aqueous humic substance) was removed, Fe(III) was enriched selectively onto NMCP with the coexistence of interference metal ions (e.g. Co(II) and Cd(II)) and then transformed into Fe(II) by hydroxylamine and photoreduction and for colorimetric analysis. The obstacle of o-phenanthroline colorimetric method was overcome. The photodegradation activity of MoO3was improved 2.02 times by nitrogen doping with the optimal mass ratio, which was also 5.11 times of P25-TiO2. The concentration of Fe(III) on NMCP was quantified by the gray-scale using smart phones and image processing software, without complicated equipment. Based on multifunctional NMCP, a fully integrated visual analysis system was proposed and suitable for the field detection of Fe(III) in natural water. The log-linear calibration curve for Fe(III) was in the range of 0.05–5 mg/L with a determination coefficient (R2) of 0.976 and detection limit of 15 μg/L.