Zhang Xin, Wang Siqin, Dao Jiahao, Guo Jiajing, Gao Yanfang
College of Chemical Engineering, Inner Mongolia University of Technology 49 Aimin Road Hohhot 100085 China
RSC Adv. 2022 Oct 5;12(44):28349-28358. doi: 10.1039/d2ra04831k. eCollection 2022 Oct 4.
A novel colorimetric platform based on nano-composites of two-dimensional (2D) molybdenum disulfide nanosheets (MoS NSs) and one-dimensional (1D) carbon nanotubes (CNTs), called 2D-1D MoS-CNT nanozyme, was fabricated for the selective and sensitive determination of hydrogen peroxide (HO) in soda water. The MoS-CNT nanozyme was synthesized through a one-step solvothermal reduction method. The introduced CNTs could effectively prevent the stacking of MoS nanosheets (NSs) and not only expanded the interlayer distance of MoS NSs from 0.620 nm to 0.710 nm but also improved their specific surface. Under acidic conditions, the as-prepared 2D-1D MoS-CNT nanozymes could oxidize the colorless 3,3',5,5'-tetramethylbenzidine (TMB) to blue-oxidized TMB (oxTMB) in the presence of HO, resulting in enhanced peroxidase-like (POD-like) activity. The kinetic study showed that MoS-CNT nanozyme had stronger catalytic activity than natural horseradish peroxidase (HRP). The linear range for HO colorimetric determination was 5.00-500 μmol L with a limit of detection (LOD) of 1.40 μmol L. Furthermore, the established determination method was applied to actual samples and the recoveries of HO spiked in soda water were in the range of 92.3-107%, showing feasibility for the analysis of food.
构建了一种基于二维（2D）二硫化钼纳米片（MoS NSs）和一维（1D）碳纳米管（CNTs）的纳米复合材料的新型比色平台，即2D-1D MoS-CNT纳米酶，用于选择性灵敏测定苏打水中的过氧化氢（HO）。通过一步溶剂热还原法合成了MoS-CNT纳米酶。引入的碳纳米管能有效防止二硫化钼纳米片的堆叠，不仅使二硫化钼纳米片的层间距从0.620纳米扩大到0.710纳米，还提高了其比表面积。在酸性条件下，所制备的2D-1D MoS-CNT纳米酶在过氧化氢存在下能将无色的3,3',5,5'-四甲基联苯胺（TMB）氧化为蓝色氧化态TMB（oxTMB），从而增强过氧化物酶样（POD样）活性。动力学研究表明，MoS-CNT纳米酶比天然辣根过氧化物酶（HRP）具有更强的催化活性。过氧化氢比色测定的线性范围为5.00 - 500 μmol/L，检测限（LOD）为1.40 μmol/L。此外，将所建立的测定方法应用于实际样品，苏打水中加标的过氧化氢回收率在92.3% - 107%范围内，表明该方法在食品分析中具有可行性。
