Chitosan chelated resin for removing lead in bastnaesite waste liquid, and its preparation method
A technology of chelating resin and bastnaesite, which is applied in the field of chelating resin and its preparation, can solve the problems of secondary pollution of crosslinking agent, reduce the adsorption capacity of heavy metals, etc., and achieve the effect of avoiding the use of organic solvents and simple operation
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preparation Embodiment 1
[0034] (1) Disperse 10g of chitosan in a mixed solvent of deionized water / isopropanol with a volume ratio of 1:4, add 13.5g of solid sodium hydroxide, and alkalize and swell in a water bath at 50°C for 1 hour;
[0035] (2) Dissolve 15g of chloroacetic acid in 20ml of isopropanol and add it to the solution obtained in step (1). After reacting for 4 hours, add 200ml of 70% absolute ethanol to stop the reaction, filter out the solid, and use 70% anhydrous The solid was washed with water and ethanol, and vacuum-dried at room temperature to obtain carboxymethylated chitosan sodium salt;
[0036] (3) Take sodium ethoxide solution and equimolar methyl trioctyl ammonium chloride solution, react for 4 hours, centrifuge out sodium chloride precipitate, add an equal volume of deionized water to the filtrate for hydrolysis, and obtain methyl trioctyl Quaternary ammonium alkali solution;
[0037] (4) Take 5g of carboxymethylated chitosan sodium salt obtained in step (2), dissolve it in de...
preparation Embodiment 2
[0040] (1) Disperse 10g of chitosan in a mixed solvent of deionized water / isopropanol with a volume ratio of 1:4, add 13.5g of solid sodium hydroxide, and alkalize and swell in a water bath at 30°C for 6 hours;
[0041] (2) Dissolve 15g of chloroacetic acid in 10ml of isopropanol and add it to the solution obtained in step (1). After reacting for 2 hours, add 300ml of 60% absolute ethanol to stop the reaction, filter out the solid, and use 70% of The solid was washed with absolute ethanol, and vacuum-dried at room temperature to obtain carboxymethylated chitosan sodium salt;
[0042] (3) Take sodium ethoxide solution and equimolar methyl trioctyl ammonium bromide solution, react for 12 hours, centrifuge out sodium chloride precipitate, add an equal volume of deionized water to the filtrate for hydrolysis, and obtain methyl trioctyl ammonium bromide Quaternary ammonium alkali solution;
[0043] (4) Take 5 g of the carboxymethylated chitosan sodium salt obtained in step (2), di...
preparation Embodiment 3
[0045] (1) Disperse 10g of chitosan in a mixed solvent of deionized water / isopropanol with a volume ratio of 1:4, add 13.5g of solid sodium hydroxide, and alkalize and swell in a water bath at 60°C for 1 hour;
[0046](2) Dissolve 15g of chloroacetic acid in 50ml of isopropanol, add it to the solution obtained in step (1), and react for 10 hours, add 100ml of 80% absolute ethanol to stop the reaction, filter out the solid, and use 70% of The solid was washed with absolute ethanol, and vacuum-dried at room temperature to obtain carboxymethylated chitosan sodium salt;
[0047] (3) Take sodium ethoxide solution and equimolar benzyltrimethylammonium chloride solution, react for 2 hours, centrifuge out sodium chloride precipitate, add an equal volume of deionized water to the filtrate for hydrolysis, and obtain benzyltrimethylammonium chloride Quaternary ammonium alkali solution;
[0048] (4) Take 5g of carboxymethylated chitosan sodium salt obtained in step (2), dissolve it in de...
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