Near-infrared low-temperature desorption type intelligent adsorption material and preparation method and application thereof
An adsorption material and near-infrared technology, applied in separation methods, chemical instruments and methods, textiles and papermaking, etc., can solve the problems of high regeneration energy consumption, poor regeneration ability of membrane materials, and serious equipment corrosion, etc., and achieve in-situ low temperature Effects of regeneration and structural stabilization
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Embodiment 1
[0028] S1. Preparation of carboxylated cellulose nanofibers: Take 4g of dry bagasse pulp fibers in an Erlenmeyer flask, add 200mL of potassium hydrogen phthalate buffer solution (0.05M, pH=3), and then add 2.0g of high iodine After wrapping with tin foil, stir at 30°C for 4.5 hours, and finally add 10 mL of ethylene glycol to terminate the reaction, filter and wash the product, and dry to obtain dialdehyde fibers. Add 180mL of sodium phosphate buffer solution (0.05M, pH=6.8) to 2g of dialdehyde fibers, and stir the suspension in a sealed flask at 500rmp and 55°C, then add 0.030g of TEMPO, then add 1.69M, 1.183mL sodium hypochlorite solution, finally add 2.1307g sodium chlorite, oxidize for 17h, add 5mL ethanol to quench, wash and dry to obtain carboxylated cellulose nanofibers.
[0029] S2. Preparation of polyethyleneimine responsive to stepwise dual-temperature stimuli: 1.5 g of polyethyleneimine was dissolved in 10 mL of water, and 0.9 g of N-isopropylacrylamide was dissolve...
Embodiment 2
[0035] S1. Preparation of carboxylated cellulose nanofibers: Take 4g of absolute dry bagasse pulp fiber in an Erlenmeyer flask, add 200mL of potassium hydrogen phthalate buffer (0.05M, pH=3), then add 2.4g of high iodine After wrapping with tin foil, stir at 35°C for 4 hours, and finally add 10 mL of ethylene glycol to terminate the reaction, filter and wash the product, and dry to obtain dialdehyde fibers. Add 180mL of sodium phosphate buffer solution (0.05M, pH=6.8) to 2g of dialdehyde fibers, and stir the suspension in a sealed flask at 500rmp and 60°C, then add 0.032g of TEMPO, add 1.69M, 1.183mL sodium hypochlorite solution, then add 2.1307g sodium chlorite, oxidize for 16h, add 5mL ethanol to quench, wash and dry to obtain carboxylated cellulose nanofibers.
[0036] S2. Preparation of polyethyleneimine responsive to stepwise dual-temperature stimuli: 2.0 g of polyethyleneimine was dissolved in 10 mL of water, and 1.8 g of N-isopropylacrylamide was dissolved in 30 mL of w...
Embodiment 3
[0042] S1. Preparation of carboxylated cellulose nanofibers: Take 4g of dry bagasse pulp fibers in an Erlenmeyer flask, add 200mL of potassium hydrogen phthalate buffer solution (0.05M, pH=3), and then add 3.0g of high iodine After wrapping with tin foil, stir at 40°C for 3.5 hours, and finally add 10 mL of ethylene glycol to terminate the reaction, filter and wash the product, and dry to obtain dialdehyde fibers. Add 180mL of sodium phosphate buffer solution (0.05M, pH=6.8) to 2g of dialdehyde fibers, and stir the suspension in a sealed flask at 500rmp and 65°C, then add 0.035g of TEMPO, add 1.69M, 1.183mL sodium hypochlorite solution, then add 2.1307g sodium chlorite, oxidize for 15h, add 5mL ethanol to quench, wash and dry to obtain carboxylated cellulose nanofibers.
[0043]S2. Preparation of polyethyleneimine responsive to stepwise dual-temperature stimuli: 2.5 g of polyethyleneimine was dissolved in 10 mL of water, and 2.7 g of N-isopropylacrylamide was dissolved in 30 m...
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