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作为纳米酶的碳纳米纤维的热力学与动力学分析

Thermodynamics and kinetic analysis of carbon nanofibers as nanozymes.

作者信息

Bahreini Maziar, Movahedi Monireh, Peyvandi Maryam, Nematollahi Fereshteh, Sepasi Tehrani Hessam

机构信息

Department of Chemistry, North Tehran Branch, Islamic Azad University, Tehran, Iran.

Department of Cellular and Molecular, Faculty of Biological Sciences, North Tehran Branch, Islamic Azad University, Tehran, Iran.

出版信息

Nanotechnol Sci Appl. 2019 Jul 16;12:3-10. doi: 10.2147/NSA.S208310. eCollection 2019.

DOI:10.2147/NSA.S208310
PMID:31406458
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6642662/
Abstract

PURPOSE

Evaluation of structural features, thermodynamics and kinetic properties of carbon nanofibers (CNFs) as artificial nanoscale enzymes (nanozyme).

METHODS

Synthesis of CNFs was done using chemical vapor deposition, and transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM) and energy-dispersive x-ray spectroscopy (EDX) were used to provide information on the morphology, elemental monitoring and impurity assay of the CNFs. The thermal features of the CNFs were evaluated using differential thermal analysis (DTA), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) derivative and TGA. The calculated thermo-physical parameters were melting temperature (), weight loss maximum temperature ( ) and enthalpy of fusion (Δ ). Catalytic activity was assayed by a 4-aminoantypyrine (4-AAP)-HO coupled colorimetric system by UV-visible spectroscopy.

RESULTS

FE-SEM and TEM analysis demonstrated parallel graphitic layers and uniformity of atomic orientation and morphology. The EDX spectra approved carbon element as major signal and presence of partial Ti as impurities of CNFs during CVD process. The DTA thermogram showed the endothermic process had a maximum temperature of 82.27°C at -15.48 mV and that thermal decomposition occurred at about 200°C. The TGA-differential gravimetric analysis thermogram showed that was 700°C. The DSC heat flow curve showed a melting temperature (Tm) of 254.52°C, Δ of 3.84 J^.g, area under the curve of 58.58 mJ and (onset) and (end set) temperatures of 246.60°C and 285.67°C, respectively. The peroxidase activity of the CNFs obeyed the Michaelis-Menten equation with a double-reciprocal curve and the calculated and kinetic parameters.

CONCLUSION

CNFs as peroxidase nanozymes are intrinsically strong and stable nanocatalysts under difficult thermal conditions. The peroxidase activity was demonstrated, making these CNFs candidates for analytical tools under extreme conditions.

摘要

目的

评估作为人工纳米级酶（纳米酶）的碳纳米纤维（CNF）的结构特征、热力学和动力学性质。

方法

采用化学气相沉积法合成CNF，并使用透射电子显微镜（TEM）、场发射扫描电子显微镜（FE-SEM）和能量色散X射线光谱（EDX）来提供有关CNF的形态、元素监测和杂质分析的信息。使用差示热分析（DTA）、差示扫描量热法（DSC）、热重分析（TGA）导数和TGA评估CNF的热特征。计算得到的热物理参数为熔点温度（）、失重最高温度（）和熔化焓（Δ）。通过紫外可见光谱法，采用4-氨基安替比林（4-AAP）-HO偶联比色系统测定催化活性。

结果

FE-SEM和TEM分析表明存在平行的石墨层以及原子取向和形态的均匀性。EDX光谱证实碳元素为主要信号，并且在化学气相沉积过程中存在部分Ti作为CNF的杂质。DTA热重曲线显示吸热过程在-15.48 mV时最高温度为82.27°C，热分解发生在约200°C。TGA-差示重量分析热重曲线显示为700°C。DSC热流曲线显示熔点温度（Tm）为254.52°C，Δ为3.84 J^.g，曲线下面积为58.58 mJ以及（起始）和（结束）温度分别为246.60°C和285.67°C。CNF的过氧化物酶活性符合米氏方程，具有双倒数曲线以及计算得到的和动力学参数。

结论

作为过氧化物酶纳米酶的CNF在困难的热条件下本质上是强大且稳定的纳米催化剂。已证明其过氧化物酶活性，使这些CNF成为极端条件下分析工具的候选者。

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