Ninhydrin functionalized chitosan adsorbent as well as preparation method and application thereof
A technology of ninhydrin hydrate and chitosan, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve the problems of reducing adsorption capacity, and achieve easy separation, low cost and high performance Effect
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Embodiment 1
[0022] The ninhydrin functionalized chitosan adsorbent has a structural formula of:
[0023] .
[0024] The preparation method of this ninhydrin functionalized chitosan adsorbent, its concrete steps are as follows:
[0025] Step 1. Dissolve 3.22g of chitosan in 100mL of 2wt% glacial acetic acid and stir until the solution becomes clear, dissolve 1.78g of ninhydrin in 50mL of absolute ethanol, pour the ninhydrin solution into chitosan In the solution, the mixed solution was stirred at 50°C for 18 hours; the ratio of chitosan, ninhydrin, glacial acetic acid and absolute ethanol was 3.22:1.78:100:50g:g:mL:mL;
[0026] Step 2. Add 1 mL of glutaraldehyde solution dropwise to the solution obtained in step 1 as a cross-linking agent. After stirring for 18 hours, add 0.1 mol / L NaOH solution dropwise until the pH of the solution reaches 12. Filter the resulting precipitate and wash until neutral. After drying in a vacuum oven, the solid was ground into a fine powder to obtain a nin...
Embodiment 2
[0030] The ninhydrin functionalized chitosan adsorbent has a structural formula of:
[0031] .
[0032] The preparation method of this ninhydrin functionalized chitosan adsorbent, its concrete steps are as follows:
[0033] Step 1. Dissolve 3.22g of chitosan in 150mL of 2% glacial acetic acid and stir until the solution becomes clear, dissolve 1.78g of ninhydrin in 70mL of absolute ethanol, pour the ninhydrin solution into chitosan In the solution, the mixed solution was stirred at 70°C for 24 hours; the ratio of chitosan, ninhydrin, glacial acetic acid and absolute ethanol was 3.22:1.78:150:70 g:g:mL:mL;
[0034] Step 2. Add 3 mL of glutaraldehyde solution dropwise to the solution obtained in step 1 as a cross-linking agent. After stirring for 24 hours, add 0.1 mol / L NaOH solution dropwise until the pH of the solution reaches 12, filter the resulting precipitate and wash to neutrality. After drying in a vacuum oven, the solid was ground into a fine powder to obtain a ninh...
Embodiment 3
[0038] The ninhydrin functionalized chitosan adsorbent has a structural formula of:
[0039] .
[0040] The preparation method of this ninhydrin functionalized chitosan adsorbent, its concrete steps are as follows:
[0041] Step 1. Dissolve 3.22g of chitosan in 125mL of 2% glacial acetic acid and stir until the solution becomes clear, dissolve 1.78g of ninhydrin in 60mL of absolute ethanol, pour the ninhydrin solution into chitosan In the solution, the mixed solution was stirred at 60°C for 21 hours; the ratio of chitosan, ninhydrin, glacial acetic acid and absolute ethanol was 3.22:1.78:125:60g:g:mL:mL;
[0042] Step 2. Add 2 mL of glutaraldehyde solution dropwise to the solution obtained in step 1 as a cross-linking agent. After stirring for 21 hours, add 0.1 mol / L NaOH solution dropwise until the pH of the solution reaches 12. Filter the precipitate and wash to neutrality. After drying in a vacuum oven, the solid was ground into a fine powder to obtain a ninhydrin funct...
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