A method for absorbing heavy metal ions in water by cellulose ester film
A technology of cellulose ester membrane and heavy metal ions, which is applied in the fields of adsorbing water/sewage treatment, chemical instruments and methods, water pollutants, etc. Effects of elastic modulus, good thermal stability, high tensile strength and elongation at break
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[0027] The preparation method of the cellulose ester film is as follows: esterifying microcrystalline cellulose and citric anhydride to obtain cellulose ester, introducing glutamic acid into the side chain of cellulose ester through amide reaction to crosslink the cellulose ester to obtain Glutamic acid cross-linked cellulose ester, the dispersion liquid of glutamic acid cross-linked cellulose ester is placed in a mold and freeze-dried to obtain a glutamic acid cross-linked cellulose ester film.
[0028] Preferably, the mass ratio of microcrystalline cellulose to citric anhydride is 2:0.9˜1.1.
[0029] Preferably, the mass ratio of microcrystalline cellulose to glutamic acid is 2:0.1-0.5.
[0030] Preferably, the step of preparing cellulose ester film is:
[0031] (1) Prepare the microcrystalline cellulose into a cellulose solution, add dropwise a citric anhydride solution to the cellulose solution, and heat to 65±2°C for reaction to obtain a cellulose ester solution;
[003...
Embodiment 1
[0043] (1) 2 g of dry microcrystalline cellulose (MCC) and 25 mL of dimethylacetamide (DMAc) were mixed in a flask and heated at 130 °C for 30 min, then 2 g of lithium chloride (LiCl) was added to the mixture and Continue heating for 10 minutes. Subsequently, the above mixture was stirred at room temperature for 12 h to obtain a cellulose solution (MCC solution for short). Then, 1 g of citric anhydride (CAD) dissolved in 6 mL of DMAc was added dropwise to the above MCC solution under stirring. The final mixture was stirred at room temperature for 30 min, and then reacted at 65° C. for 24 h to obtain a cellulose ester solution (MCC ester solution for short).
[0044] (2) 0.2g 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide (EDC), 0.1g N-hydroxysuccinimide (NHS) and 0.1g of glutamic acid ( L-GA) was dispersed in 5 mL DMAc for 2 h. Finally, the dispersion was added to the cellulose ester solution and stirred at room temperature for 24 hours to obtain a crosslinking solution.
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Embodiment 2
[0047] This embodiment is the same as Example 1, except that: in step (2), it is 0.2 g of glutamic acid, and the glutamic acid cross-linked cellulose ester film finally prepared is denoted as MCC-CAD-10%GA .
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