A composite consisting of microporous carbon and cobalt(III) oxide and prepared from zeolitic imidazolate framework-67 for voltammetric determination of ascorbic acid
A composite consisting of microporous carbon and cobalt(III) oxide and prepared from zeolitic imidazolate framework-67 for voltammetric determination of ascorbic acid
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DOI：
10.1007/s00604-018-2669-x
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发表时间：
2018-01
影响因子：
5.7
通讯作者：
Y. Haldorai;S. Choe;Y. Huh;Young‐Kyu Han
中科院分区：
文献类型：
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作者：
Y. Haldorai;S. Choe;Y. Huh;Young‐Kyu Han
以单前驱体（沸石咪唑酸骨架-67）为原料合成了纳米多孔碳/氧化钴（NPC/Co3O4）复合材料。透射电镜显示，平均粒径为10 nm（±2 nm）的co3o4纳米颗粒在NPC基质中分散良好。然而，在少数地方，co3o4纳米粒子聚集。该复合材料在pH 7.0的磷酸盐缓冲液中对抗坏血酸（AA）表现出良好的电氧化性能。复合电极的差分脉冲伏安响应（0.12 V vs. SCE）在2 ~ 240 μM AA浓度范围内呈线性，检测限为20 nM。该电极灵敏度高（0.13 μA·μM·cm−2），重现性可靠，选择性好。该方法用于维生素C片中AA的直接测定，加样回收率为98.0% ~ 102.0%。以单一前驱体（沸石咪唑酸骨架-67）为原料，制备了co2o3修饰的纳米多孔碳复合材料。在抗坏血酸电氧化方面表现出优异的性能，灵敏度高（0.13 μA·μM·cm−2），重现性可靠，选择性好。
A nanoporous carbon/cobalt oxide (NPC/Co3O4) composite was synthesized from a single-precursor (zeolitic imidazolate framework-67). Transmission electron microscopy showed that the Co3O4nanoparticles with an average particle size of 10 nm (±2 nm) were well dispersed in the NPC matrix. However, in a few places, Co3O4nanoparticles were aggregated. The composite shows outstanding performance in terms of electrooxidation of ascorbic acid (AA) in phosphate buffer of pH 7.0. The differential pulse voltammetric response of the composite electrode (at 0.12 V vs. SCE) is linear in the 2–240 μM AA concentration range, with a 20 nM detection limit. The electrode exhibits high sensitivity (0.13 μA·μM·cm−2), reliable reproducibility, and good selectivity. The method, when applied to the direct determination of AA in vitamin C tablets, gave recoveries between 98.0 and 102.0%.Graphical abstractA nanoporous carbon composite decorated with Co2O3nanoparticles was prepared from a single precursor (the zeolitic imidazolate framework-67). It shows outstanding performance in terms of electrooxidation of ascorbic acid with high sensitivity (0.13 μA·μM·cm−2), reliable reproducibility, and good selectivity.