Preparation and application of a dendritic mesoporous silica/iridium dioxide composite nanometer enzyme
A technology of mesoporous silica and iridium dioxide, applied in organic compound/hydride/coordination complex catalysts, chemical instruments and methods, chemical/physical processes, etc. Problems such as poor particle stability and increased economic costs can achieve the effect of improving thermal stability, considerable application prospects, and good catalytic thermal stability
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Embodiment 1
[0042] The embodiment of the present invention provides a preparation method of dendritic mesoporous silica / iridium dioxide composite nanozyme, comprising the following steps:
[0043] (1) Place an iridium metal target with a purity of 99.99wt% on the bottom of the glass tube, add 3 mL of redistilled ethanol, and then focus a pulsed laser with an energy of 85 mJ, a wavelength of 532 nm, and a focal length of 77 nm on the glass tube immersed in redistilled ethanol The iridium metal target was ablated for 20 minutes to obtain an ethanol dispersion of ultra-small iridium dioxide;
[0044] (2) Dissolve 380 mg of CTAB and 168 mg of sodium salicylate in 25 mL of deionized water containing 95 μL of triethylamine and stir for 1 h, add TEOS to the above mixing system, stir for 1.5 h, and then add 25 mL of absolute ethanol to terminate React, centrifuge for 10 minutes to obtain the product, and wash with ethanol and water 3 times and methanol / hydrochloric acid mixed solution reflux 16h ...
Embodiment 2
[0048] Mix 10 μL of 50 mM TMB solution and 10 μL of 250 mM HO 2 o 2 The solution was added to 970 μL acetic acid-sodium acetate buffer solution, and incubated at 25°C for 5 minutes, and then, a dendritic mesoporous silica / iridium dioxide composite nanozyme dispersion containing 236.2 μg / mL iridium dioxide was added thereto To start the reaction, add only the dendritic mesoporous silica carrier and the substrates TMB and H 2 o 2 , substrate TMB and H 2 o 2 With the substrate TMB as a control, its absorption spectrum was measured in the range of 300-900 nm after reacting at 25° C. for 10 minutes.
[0049] image 3 It is a color photograph and a comparison chart of visible absorption spectrum of dendritic mesoporous silica / iridium dioxide composite nanozyme catalyzed TMB oxidation and control experiment, from image 3 It can be seen that the dendritic mesoporous silica support alone cannot catalyze the color development of TMB, and TMB itself is difficult to be detected by ...
Embodiment 3
[0051] 10 μL 50 mM OPD, ABTS, DAB, DOPA solution and 10 μL 250 mM H 2 o 2 The solution was added to 970 μL acetic acid-sodium acetate buffer solution, and incubated at 25° C. for 5 min, and then, a dendritic mesoporous silica / iridium dioxide composite nanozyme dispersion containing 236.2 μg / mL iridium dioxide was added thereto to To start the reaction, take only 10 μL of 50 mMOPD, ABTS, DAB and DOPA solution in 990 μL of acetic acid-sodium acetate buffer solution as a control, react at 25 °C for 10 min, and measure the absorption spectra in different wavelength ranges.
[0052] Figure 4-7 The color rendering diagram and visible absorption spectrum comparison diagram of the dendritic mesoporous silica / iridium dioxide composite nanozyme catalyzed oxidation of OPD, ABTS, DAB and DOPA and the blank test respectively; it can be seen from the figure that the dendritic mesoporous Silica / iridium dioxide composite nanozyme with catalytic H 2 o 2 Oxidation of OPD showed yellow, oxi...
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