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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

Active Publication Date: 2016-01-06
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this preparation method fails to fully expose the modification sites of lignin, and the modification efficiency is low, and only diamine compounds are used as modifiers, which have fewer binding sites for heavy metals.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation method of lignin modified heavy metal passivator, the operation steps are as follows:

[0024] In the first step, weigh 4.0 g of alkali lignin and add it to 200 mL of distilled water, stir for 0.5 hours, and adjust the pH value of the solution to 3.5 with hydrochloric acid.

[0025] The second step, add ferrous chloride and 1mL mass concentration successively and be 30% hydrogen peroxide, the dosage of ferrous chloride is according to m (Fe 2+ ):m(H 2 o 2 )=1︰4 added, reacted at 50°C for 1 hour and then stood still for 0.5 hour,

[0026] The third step is to adjust the pH value of the solution to 9.5 with NaOH solution, add 5g of diethylenetriamine, and then add 0.024mol formaldehyde according to the molar ratio of diethylenetriamine and formaldehyde as 1:0.5, stir evenly, and keep the solution at 80 °C for 1 hour,

[0027] In the fourth step, after the reaction is completed, add dropwise a hydrochloric acid solution with a mass concentration of 10% ...

Embodiment 2

[0030] The preparation method of lignin modified heavy metal passivator, the operation steps are as follows:

[0031] In the first step, weigh 10.0 g of alkali lignin and add it to 200 mL of distilled water, stir for 0.5 hours, and adjust the pH value of the solution to 3.5 with hydrochloric acid.

[0032] The second step, add ferrous chloride and 1mL mass concentration successively and be 30% hydrogen peroxide, the dosage of ferrous chloride is according to m (Fe 2+ ):m(H 2 o 2 )=1︰6 was added, reacted at 50°C for 1 hour and then stood still for 0.5 hours,

[0033] In the third step, adjust the pH value of the solution to 9.5 with NaOH solution, add 10g of diethylenetriamine, and then add 0.29mol of formaldehyde according to the molar ratio of diethylenetriamine and formaldehyde as 1:3, stir well, and keep the solution at 70°C reaction for 3 hours,

[0034] In the fourth step, after the reaction is completed, add dropwise a hydrochloric acid solution with a mass concentra...

Embodiment 3

[0037] The preparation method of lignin modified heavy metal passivator, the operation steps are as follows:

[0038] In the first step, weigh 20.0 g of alkali lignin and add it to 200 mL of distilled water, stir for 0.5 hours, and adjust the pH value of the solution to 3.5 with hydrochloric acid.

[0039] The second step, add ferrous chloride and 1mL mass concentration successively and be 30% hydrogen peroxide, the dosage of ferrous chloride is according to m (Fe 2+ ):m(H 2 o 2 )=1︰7 was added, reacted at 50°C for 1 hour and then stood still for 0.5 hours,

[0040] The third step is to adjust the pH value of the solution to 9.5 with NaOH solution, add 15g of diethylenetriamine, then add 0.29mol of formaldehyde according to the molar ratio of diethylenetriamine and formaldehyde as 1:2, stir well, and keep the solution at 50°C 4 hours of reaction,

[0041] In the fourth step, after the reaction is completed, add dropwise a hydrochloric acid solution with a mass concentratio...

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Abstract

The invention discloses a preparing method of a lignin-modified heavy metal passivator, which comprises the following steps: (1) dissolving a certain amount of lignin in water to prepare a solution and adjusting the solution to be acidic; (2)_sequentially adding ferrous chloride and hydrogen peroxide according to certain proportion, heating for reaction for a certain time and standing; (3) adjusting the solution to be alkali, then sequentially adding a certain amount of diethylenetriamine and formaldehyde, stirring uniformly, and heating for reaction for a certain time; (4) after the reaction, dropwise adding a HCL solution under the stirring state to separate out a product, standing and performing suction filtration to obtain the aminating modified lignin; (5) washing unreacted agents with water, and then drying and grinding the product to obtain the lignin-modified heavy metal passivator finished product. The method is simple in process, low in production cost, excellent in performance and wide in suitable range, and suitable for a passivation repair process of soil polluted by various heavy metal ions, and an adsorption and coagulation treatment process of waste water containing the heavy metal ions.

Description

technical field [0001] The invention relates to the technical field of soil heavy metal pollution passivation treatment, in particular to a preparation method for preparing a heavy metal passivator by amination modification of lignin. Background technique [0002] With the continuous development of mining, smelting, lead battery, leather, chemical and other industries, the "three wastes" containing heavy metals enter the soil environment through various channels, causing serious pollution to the soil. Heavy metal pollution has the characteristics of wide pollution range, long duration, concealment of pollution, and inability to be biodegraded. It not only causes great harm to the yield and quality of crops, but also continuously accumulates through the food chain, and eventually accumulates in the human body to cause harm. healthy. According to the National Soil Survey Bulletin issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014...

Claims

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Application Information

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IPC IPC(8): C09K17/32C08H7/00B01J20/24B01J20/30C02F1/28C02F101/20
Inventor 刘妮王双飞朱红祥覃程荣刘新亮
Owner GUANGXI UNIV
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