Cerium(III)-doped MoS2 nanosheets with expanded interlayer spacing and peroxidase-mimicking properties for colorimetric determination of hydrogen peroxide,Microchimica Acta

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Cerium(III)-doped MoS2 nanosheets with expanded interlayer spacing and peroxidase-mimicking properties for colorimetric determination of hydrogen peroxide
Microchimica Acta ( IF 5.3 ) Pub Date : 2020-01-09 , DOI: 10.1007/s00604-019-4078-1
Xin Zhang ₁ , Cuiyan Wang ₁ , Yanfang Gao ₁

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Molybdenum disulfide (MoS2) nanosheets (NSs) with an 8.1 Å interlayer spacing were heavily loaded with cerium(III) ions by a one-step hydrothermal method. The material thus obtained has a strong peroxidase-like (POx-like) activity. The introduction of the large Ce(III) ion enlarges the interlayer distance of MoS2NSs. It also supports shuttling and transport of substrate, intermediates and electrons. It also increases the specific surface of MoS2. This results in a larger number of active sites, accelerates the contact between substrate and catalytic surface, and improves the kinetics of the catalytic reaction. The nanomaterial catalyzes the oxidation of colorless 3,3′,5,5′-tetramethylbenzidine by hydrogen peroxide (H2O2 ) to give a blue-green product with an absorption maximum at 652 nm. The assay has a linear response in the 1–50 μM H2O2 concentration range and a 0.47 μM limit of detection. The colorimetric method was applied to real milk samples, and high recoveries (98.4%–108.0%) and repeatability were obtained. Graphical abstract Molybdenum disulfide nanosheets loaded with cerium(III) catalyze the oxidation of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) by hydrogen peroxide to give a blue-green product with an absorption maximum at 652 nm Molybdenum disulfide nanosheets loaded with cerium(III) catalyze the oxidation of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) by hydrogen peroxide to give a blue-green product with an absorption maximum at 652 nm

中文翻译：

具有扩大的层间距和过氧化物酶模拟特性的铈 (III) 掺杂的 MoS2 纳米片，用于比色测定过氧化氢

层间距为 8.1 埃的二硫化钼 (MoS2) 纳米片 (NSs) 通过一步水热法负载了铈 (III) 离子。由此获得的材料具有很强的过氧化物酶样（POx样）活性。大 Ce(III) 离子的引入扩大了 MoS2NSs 的层间距离。它还支持底物、中间体和电子的穿梭和传输。它还增加了 MoS2 的比表面积。这导致了大量的活性位点，加速了底物和催化表面之间的接触，并改善了催化反应的动力学。该纳米材料通过过氧化氢 (H2O2) 催化无色 3,3',5,5'-四甲基联苯胺氧化，得到蓝绿色产物，在 652 nm 处具有最大吸收。该测定在 1–50 μM H2O2 浓度范围内具有线性响应，检测限为 0.47 μM。将比色法应用于实际牛奶样品，获得了高回收率 (98.4%–108.0%) 和重现性。图形摘要载有铈 (III) 的二硫化钼纳米片催化过氧化氢对无色 3,3',5,5'-四甲基联苯胺 (TMB) 的氧化，得到蓝绿色产物，在 652 nm 二硫化钼纳米片处有最大吸收负载铈 (III) 催化无色 3,3',5,5'-四甲基联苯胺 (TMB) 被过氧化氢氧化，得到蓝绿色产物，在 652 nm 处有最大吸收

更新日期：2020-01-09

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