A kind of cellulose nano-silver composite material and its preparation method and application
A composite material and cellulose technology, applied in the field of preparation of nano-silver composite materials, can solve the problem of no cellulose modification, and achieve the effects of high dispersibility and bonding, good application prospects and large surface area
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[0038] In order to obtain a material that can efficiently support nano-silver, thereby improving the effect of nano-silver, the present invention provides a preparation method of acid anhydride esterified modified cellulose, comprising the steps:
[0039] S1, ethylenediaminetetraacetic acid and acetic anhydride are carried out synthesis reaction in pyridine, obtain ethylenediaminetetraacetic acid anhydride;
[0040] Wherein, the initial ratio of the ethylenediaminetetraacetic acid, the acetic anhydride and the pyridine can be: 5g: 7~10g: 8~15ml; it should be noted that the acetic anhydride is liquid, and its quality can be passed through Weighing to obtain; the reaction temperature of the synthesis reaction can be 65 ℃-70 ℃, and the reaction time can be 12-24 h.
[0041] In addition, after the synthesis reaction, the solid substance obtained by the synthesis reaction can also be sequentially washed with acetic anhydride and petroleum ether, and then vacuum-dried, so as to obta...
Embodiment 1
[0060] Preparation of a cellulose nanosilver composite material
[0061] 1. Add 10 g of ethylenediaminetetraacetic acid (EDTA) and 14 g of acetic anhydride to 16 ml of pyridine, then heat at a reaction temperature of 65 °C and stir for 24 h. The solid substance obtained after the reaction was separated by suction filtration, washed three times with acetic anhydride and petroleum ether, and the product was vacuum dried at 60 °C for 24 h to obtain ethylenediaminetetraacetic anhydride (EDTAD).
[0062] 2. In a 100 ml volumetric flask, add 20 ml of N,N-dimethylformamide (DMF), 0.5 g of cellulose (CNC), and 3.5 g of ethylenediaminetetraacetic anhydride (EDTAD) prepared in step 1. , the mixed system was heated and refluxed in an oil bath at 60 °C for 24 h; then the solid product was separated by centrifugation, washed with ethanol and pure water, added with pure water, shaken and mixed evenly, poured into a dialysis bag for dialysis for 72 h, and freeze-dried. The acid anhydride es...
Embodiment 2
[0068] Catalytic Experiment of Cellulose Nanosilver Composites
[0069]Using the CNC-EDTA@AgNPs composite material prepared in Example 1 as the catalyst, 4-nitrophenol as the model compound, and sodium borohydride as the reducing agent; the reaction process was detected by UV-Vis spectrophotometry, and the CNC-EDTA was investigated. Catalytic performance of @AgNPs composites.
[0070] Specific operation: Add 1.5 ml of 0.24 mM 4-nitrophenol and 1.5 ml of 76 mM sodium borohydride mixed solution into the UV test tube, and then add 200 μL of CNC-EDTA@AgNPs dispersion liquid (silver in the dispersion liquid) to the UV test tube 2.0 μg / ml), the solution was mixed for 5 s and then monitored by UV-Vis spectrophotometry with a scanning range of 250-500 nm and a cycle time of 1 min.
[0071] It should be known that when 4-nitrophenol is exposed to sodium borohydride solution, the solution appears yellow-green and has a strong absorption peak at 400 nm. As the catalytic reduction react...
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