A kind of carboxymethyl-polyaminated chitosan decolorizing agent and its preparation method and application
A technology of polyaminated chitosan and carboxymethyl, which is applied in the field of sewage treatment of environmental governance, can solve the problems of poor dye adsorption performance, weak isoanion chelation performance, and poor dye removal effect, and achieve superior Effects of adsorption performance, improvement of solubility performance, enhancement of decolorization performance
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Embodiment 1
[0035] A kind of preparation method of carboxymethyl-polyaminated chitosan decolorizer, carries out as follows successively:
[0036] 1) Weigh 5 g of pulverized chitin and suspend in 100 mL of isopropanol to swell at room temperature for 2 h. Slowly add 30 mL of sodium hydroxide solution with a concentration of 8 mol / L dropwise into the above mixture, stir evenly, and freeze overnight in a refrigerator at -10°C. Weigh 10g of chloroacetic acid, dissolve it in 10mL of isopropanol by heating in a water bath, and slowly add it dropwise while stirring with a magnetic stirrer. After the dropwise addition, keep warm in a water bath at 50°C. Pour out the supernatant, add about 30 mL of water to dissolve, filter with suction, precipitate the filtrate with 3 times the amount of absolute ethanol, wash with 95% ethanol solution, and dry in vacuum to obtain O-carboxymethyl chitin.
[0037] 2) Put the obtained O-carboxymethyl chitin into a 50% sodium hydroxide solution, stir evenly, react ...
Embodiment 2
[0040] A kind of preparation method of carboxymethyl-polyaminated chitosan decolorizer, carries out as follows successively:
[0041] 1) Weigh 8 g of pulverized chitin suspended in 100 mL of isopropanol and swell at room temperature for 2 h. Slowly add 60 mL of sodium hydroxide solution with a concentration of 8 mol / L dropwise into the above mixture, stir evenly, and freeze overnight in a refrigerator at -10°C. Weigh 10g of chloroacetic acid, dissolve it in 10mL of isopropanol by heating in a water bath, and slowly add it dropwise while stirring with a magnetic stirrer. After the dropwise addition, keep warm in a water bath at 50°C. Pour out the supernatant, add about 30 mL of water to dissolve, filter with suction, precipitate the filtrate with 3 times the amount of absolute ethanol, wash with 95% ethanol solution, and dry in vacuum to obtain O-carboxymethyl chitin.
[0042] 2) Put the obtained O-carboxymethyl chitin into a 50% sodium hydroxide solution, stir evenly, react at ...
Embodiment 3
[0045] A kind of preparation method of carboxymethyl-polyaminated chitosan decolorizer, carries out as follows successively:
[0046] 1) Weigh 10 g of crushed chitin and suspend in 100 mL of isopropanol to swell at room temperature for 2 h. Slowly add 60 mL of sodium hydroxide solution with a concentration of 8 mol / L dropwise into the above mixture, stir evenly, and freeze overnight in a refrigerator at -10°C. Weigh 15g of chloroacetic acid, dissolve it in 10mL of isopropanol by heating in a water bath, and slowly add it dropwise while stirring with a magnetic stirrer. After the dropwise addition, keep warm in a water bath at 50°C. Pour out the supernatant, add about 30 mL of water to dissolve, filter with suction, precipitate the filtrate with 3 times the amount of absolute ethanol, wash with 95% ethanol solution, and dry in vacuum to obtain O-carboxymethyl chitin.
[0047] 2) Put the obtained O-carboxymethyl chitin into a 50% sodium hydroxide solution, stir evenly, react at...
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