A kind of preparation method of amidoxime-hydroxylamine oxime cellulose/nanometer silver/chitosan composite airgel
A technology of composite aerogel and cellulose, which is applied in the field of preparation of amidoxime-hydroxyamidoxime cellulose/nano silver/chitosan composite aerogel, can solve the problem of insufficient loading fastness of nanoparticles, toxic and harmful substances, The preparation process is cumbersome and other problems, and the gel process is simple and efficient, the mechanical strength is high, and the aerogel purity is high.
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Embodiment 1
[0032] Get 5g chitosan and join concentration and be in the acetic acid solution of 2wt%, stir until fully dissolving, obtain the chitosan solution that concentration is 1wt%; Pass into nitrogen, be the sodium periodate solution of 0.3mol / L with 20mL concentration Add it into the chitosan solution, oxidize at 45° C. in the dark for 5 hours, add ethylene glycol solution to terminate the reaction, and obtain dialdehyde chitosan after freeze-drying. Dissolve it in deionized water to prepare a dialdehyde chitosan solution with a concentration of 3.5 wt%.
[0033] Prepare amidoxime-hydroxylamine oxime microcrystalline cellulose according to the following steps:
[0034] S1 put 5g microcrystalline cellulose in 200mL concentration of 1.25wt% NaOH solution, boil for 80min; then place 120mL concentration of 20wt% NaOH solution according to the same bath ratio, stir at room temperature for 45min; filter, wash, drying to obtain alkalized microcrystalline cellulose;
[0035] S2 Take 2g ...
Embodiment 2
[0040] Get 2g chitosan and join in the acetic acid solution that concentration is 2wt%, stir until completely dissolving, obtain the chitosan solution that concentration is 2wt%; Pass into nitrogen, the sodium periodate solution that 30mL concentration is 0.1mol / L Add chitosan solution, oxidize at 35° C. in the dark for 4 hours, add ethanol solution to terminate the reaction, and obtain dialdehyde chitosan after vacuum drying. Dissolve it in deionized water to prepare a dialdehyde chitosan solution with a concentration of 2 wt%.
[0041] Prepare amidoxime-hydroxylamine oxime nano-cellulose according to the following steps:
[0042] S1 Put 4g nanocellulose in 120mL NaOH solution with a concentration of 3wt%, boil for 60min; then place it in 200mL NaOH solution with a concentration of 15wt% according to the same bath ratio, stir at room temperature for 60min; filter, wash with water, and dry , to obtain alkalized nanocellulose;
[0043] S2 Take 2.5g of alkalized nanocellulose ...
Embodiment 3
[0048] Get 3g chitosan and join in the acetic acid solution that concentration is 2wt%, stir until completely dissolving, obtain the chitosan solution that concentration is 3wt%; Pass into nitrogen, be the sodium periodate solution of 0.7mol / L with 10mL concentration Add chitosan solution, oxidize in the dark at 60°C for 8 hours, add a certain amount of glycerol solution to terminate the reaction, and freeze-dry to obtain dialdehyde chitosan; dissolve it in deionized water to make a concentration of 2.5 wt% dialdehyde chitosan solution.
[0049] Prepare amidoxime-hydroxylamine oxime microcrystalline cellulose according to the following steps:
[0050] S1 Put 3g microcrystalline cellulose in 100mL NaOH solution with a concentration of 2wt%, boil for 120min; then put it in 150mL NaOH solution with a concentration of 10wt% according to the same bath ratio, stir at room temperature for 120min; filter, wash with water, and dry , to obtain alkalized microcrystalline cellulose;
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