Biomass intelligent fiber-based amphoteric multifunctional adsorbing material and preparation method and application thereof
A biomass fiber and adsorption material technology, applied in the field of biomass smart fiber-based amphoteric multifunctional adsorption material and its preparation, can solve the problems of low regeneration temperature, poor removal effect, and difficulty in simultaneous removal of anion and cation heavy metal ions, etc. problem, to achieve the effect of promoting the adsorption rate
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Embodiment 1
[0029] S1. Preparation of carboxylated biomass fibers: Add 180mL of sodium phosphate buffer solution (0.05M, pH=6.8) to 2g of bagasse pulp fibers, and stir the suspension in a sealed flask at 500rmp and 55°C, Then add 0.025g 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 biomass fiber.
[0030] 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 dissolved in 30 mL of water. Under the condition of 55° C. and magnetic stirring, 10 mL of polyethyleneimine aqueous solution was added dropwise into 30 mL of N-isopropylacrylamide aqueous solution, and after 22 hours of reaction, it was quenched with liquid nitrogen. All the obtained solutions were dialyzed in water with MWCO500D dialysis bag for 22 hours, and then freeze-dri...
Embodiment 2
[0035] S1. Preparation of carboxylated biomass fibers: Add 180mL of sodium phosphate buffer solution (0.05M, pH=6.8) to 2g of bagasse pulp fibers, and stir the suspension in a sealed flask at 500rmp and 60°C, then Add 0.026g TEMPO, then add 1.69M, 1.183mL sodium hypochlorite solution, finally add 2.1307g sodium chlorite, oxidize for 16h, add 5mL ethanol to quench, wash and dry to obtain carboxylated biomass fiber.
[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 water. Under the condition of 60° C. and magnetic stirring, 10 mL of polyethyleneimine aqueous solution was added dropwise to 30 mL of N-isopropylacrylamide aqueous solution, and after 24 hours of reaction, it was quenched with liquid nitrogen. All obtained solutions were dialyzed in water with MWCO500D dialysis bag for 24 hours, and then freeze-dried to ...
Embodiment 3
[0041] S1. Preparation of carboxylated biomass fibers: Add 180mL of sodium phosphate buffer solution (0.05M, pH=6.8) to 2g of bagasse pulp fibers, and stir the suspension in a sealed flask at 500rmp and 65°C, then Add 0.028g TEMPO, then add 1.69M, 1.183mL sodium hypochlorite solution, finally add 2.1307g sodium chlorite, oxidize for 15h, add 5mL ethanol to quench, wash and dry to obtain carboxylated biomass fiber.
[0042] 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 mL of water. Under the condition of 65° C. and magnetic stirring, 10 mL of polyethyleneimine aqueous solution was added dropwise to 30 mL of N-isopropylacrylamide aqueous solution, and after 26 hours of reaction, it was quenched with liquid nitrogen. All the obtained solutions were dialyzed in water with MWCO500D dialysis bag for 26 hours, and then freeze-dried...
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