Preparing method of lignin-modified heavy metal passivator
A heavy metal passivator and lignin technology, which is applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of low lignin modification efficiency and few heavy metal binding sites, etc. Achieve stable properties, strong heavy metal adsorption, and reduce pollution
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[0022] Example 1
[0023] The preparation method of lignin modified heavy metal passivator, the operation steps are as follows:
[0024] In the first step, weigh 4.0g of alkali lignin into 200mL of distilled water, stir for 0.5 hours, adjust the pH of the solution to 3.5 with hydrochloric acid,
[0025] The second step is to add ferrous chloride and 1 mL of hydrogen peroxide with a mass concentration of 30% in sequence. The dosage of ferrous chloride is according to m(Fe 2+ ):m(H 2 O 2 )=1:4, react at 50°C for 1 hour and then stand for 0.5 hour,
[0026] In the third step, adjust the pH value of the solution to 9.5 with NaOH solution, add 5 g of diethylene triamine, and add 0.024 mol of formaldehyde according to the molar ratio of diethylene triamine to formaldehyde of 1:0.5, stir evenly, and keep the solution at 80 React at ℃ for 1 hour,
[0027] In the fourth step, after the completion of the reaction, add dropwise a hydrochloric acid solution with a mass concentration of 10% under s...
Example Embodiment
[0029] Example 2
[0030] The preparation method of lignin modified heavy metal passivator, the operation steps are as follows:
[0031] In the first step, weigh 10.0g alkali lignin into 200mL distilled water, stir for 0.5 hours, adjust the pH of the solution to 3.5 with hydrochloric acid,
[0032] The second step is to add ferrous chloride and 1 mL of hydrogen peroxide with a mass concentration of 30% in sequence. The dosage of ferrous chloride is according to m(Fe 2+ ):m(H 2 O 2 )=1:6 add, react at 50°C for 1 hour and then stand for 0.5 hour,
[0033] In the third step, adjust the pH value of the solution to 9.5 with NaOH solution, add 10 g of diethylene triamine, and add 0.29 mol of formaldehyde according to the molar ratio of diethylene triamine to formaldehyde of 1:3, stir evenly, and keep the solution at 70°C React for 3 hours,
[0034] In the fourth step, after the reaction, under stirring, add dropwise a hydrochloric acid solution with a mass concentration of 10% to adjust the ...
Example Embodiment
[0036] Example 3
[0037] The preparation method of lignin modified heavy metal passivator, the operation steps are as follows:
[0038] In the first step, weigh 20.0g of alkali lignin into 200mL of distilled water, stir for 0.5 hours, adjust the pH of the solution to 3.5 with hydrochloric acid,
[0039] The second step is to add ferrous chloride and 1 mL of hydrogen peroxide with a mass concentration of 30% in sequence. The dosage of ferrous chloride is according to m(Fe 2+ ):m(H 2 O 2 )=1:7 added, reacted at 50°C for 1 hour and then stood for 0.5 hour,
[0040] In the third step, adjust the pH value of the solution to 9.5 with NaOH solution, add 15 g of diethylene triamine, and add 0.29 mol of formaldehyde according to the molar ratio of diethylene triamine to formaldehyde of 1:2, stir well, and keep the solution at 50°C React for 4 hours,
[0041] In the fourth step, after the reaction, add dropwise hydrochloric acid solution with a mass concentration of 10% under stirring to adjust...
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