Intrinsic catalase-mimicking MOFzyme for sensitive detection of hydrogen peroxide and ferric ions

被引:73
作者
Abdelhamid, Hani Nasser [1 ]
Sharmoukh, Walid [2 ]
机构
[1] Assiut Univ, Dept Chem, Adv Multifunct Mat Lab, Fac Sci, Assiut 71516, Egypt
[2] Natl Res Ctr, Dept Inorgan Chem, Tahrir St, Giza 12622, Egypt
关键词
Metal-organic frameworks; MOFzyme; Hydrogen peroxide; Metal sensing; Fluorescence; Nanozyme; Biocatalysis; METAL-ORGANIC FRAMEWORKS; FLUORESCENT-PROBE; H2O2; NANOPARTICLES; ENZYME; SENSOR; PAPER; MOF; HYDROLYSIS; REMOVAL;
D O I
10.1016/j.microc.2020.105873
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Lanthanide metal-organic frameworks (Ln-MOFs) exhibit outstanding properties, including high chemical and thermal stability, as well as their promising enzyme-mimic activity (MOFzyme). A new cerium MOFs (Ce-MOF) was synthesized via a solvothermal method using organic linker 4,4',4 '' -nitrilotribenzoic acid (H3NTB). The crystallinity of the prepared material was confirmed using X-ray diffraction (XRD). The coordination between Ce and H3NTB was approved using Fourier transforms infrared (FT-IR). The chemical and oxidation state of Ce-MOF was characterized using X-ray photoelectron spectroscopy (XPS). The analysis of XPS data suggested the presence of two oxidation states of cerium, i.e., Ce(III) and Ce(IV). According to the imaging using a scanning electron microscope (SEM) and transmission electron microscope (TEM), Ce-MOF exhibits hexagonal rods' morphology. Ce-MOF offered thermal stability up to 350 degrees C. It showed a fluorescence emission signal at wavelength 550 nm with a Stock's shift of 200 nm. Ce-MOF's application as a probe for sensing hydrogen peroxide (H2O2) and ferric ions (Fe3+) was reported. Ce-MOF exhibited peroxidase MOFzyme activity. Thus, it offered a turn-on emission upon interaction with different concentrations of H2O2. It detects Fe3+ ions with a limit of detection (LOD) and a linear range of 0.016 mu M and 0.016-0.133 mu M, respectively. The study also investigated the mechanisms of sensing for H2O2 and Fe3+ ions. The changes in the emission signals were due to the intrinsic catalase activity of Ce-MOF. Ce-MOF offered MOFzyme properties providing a promising feature for biocatalysis and biosensing applications.
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页数:9
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