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Method for preparing chelating agents for treating heavy metal in wastewater

A technology for treating wastewater and chelating agents, applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve problems such as imperfection and secondary pollution, achieve effective environmental protection, simple operation, adsorption good effect

Active Publication Date: 2016-12-07
广州富生源环保工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are many methods for the treatment of heavy metal wastewater, but they all have relative imperfections, and many of them will cause secondary pollution. In recent years, polymer chelating agents have been used more and more in the treatment of heavy metal wastewater, and they have low cost The advantage of good effect, the present invention develops a new chelating agent for the treatment of heavy metal wastewater for the deficiencies in the prior art

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  • Method for preparing chelating agents for treating heavy metal in wastewater

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Embodiment 1

[0019] A preparation method of a chelating agent for treating heavy metals in waste water, comprising the following steps:

[0020] (1) The lotus root slag obtained after extracting starch from lotus root is synthesized to obtain lotus root cellulose, which is a natural polymer chelating agent. After chemical modification, the adsorption of heavy metal ions in wastewater is enhanced. Ionized water, adjusted to a solution with a concentration of 0.15g / ml, adding 1g of N,N'-methylenebisacrylamide and γ-aminopropyltriethoxysilane to the solution for every 100ml of solution Add it into the solution, stir and react at 60°C for 2 hours to obtain modified cellulose;

[0021] (2) Add ethylenediamine and triethylenetetramine to the modified cellulose, and react to obtain aminated cellulose. The mass ratio of the addition ratio to the original cellulose is: 0.2:0.07:1, and react at 50°C for 3 hours to obtain Aminated cellulose;

[0022] (3) Add ethylene glycol, sodium hydroxide and ca...

Embodiment 2

[0025] A preparation method of a chelating agent for treating heavy metals in waste water, comprising the following steps:

[0026] (1) The lotus root slag obtained after extracting starch from lotus root is synthesized to obtain lotus root cellulose, which is a natural polymer chelating agent. After chemical modification, the adsorption of heavy metal ions in wastewater is enhanced. Ionized water, adjusted to a solution with a concentration of 0.15g / ml, adding 3g of N,N'-methylenebisacrylamide and γ-aminopropyltriethoxysilane to the solution for every 100ml of the solution Add it into the solution, stir and react at 75°C for 2.5 hours to obtain modified cellulose;

[0027] (2) Add ethylenediamine and triethylenetetramine to the modified cellulose, and react to obtain aminated cellulose. The mass ratio of the added ratio to the original cellulose is: 0.5:0.335:1, react at 60°C for 3.5h, obtain aminated cellulose;

[0028] (3) Add ethylene glycol, sodium hydroxide and carbon ...

Embodiment 3

[0031] A preparation method of a chelating agent for treating heavy metals in waste water, comprising the following steps:

[0032] (1) The lotus root slag obtained after extracting starch from lotus root is synthesized to obtain lotus root cellulose, which is a natural polymer chelating agent. After chemical modification, the adsorption of heavy metal ions in wastewater is enhanced. Ionized water, adjusted to a solution with a concentration of 0.15g / ml, adding 5g of N,N'-methylenebisacrylamide and γ-aminopropyltriethoxysilane to the solution for every 100ml of solution Add it into the solution, stir and react at 90°C for 3 hours to obtain modified cellulose;

[0033](2) Add ethylenediamine and triethylenetetramine to the modified cellulose, and react to obtain aminated cellulose. The mass ratio of the addition ratio to the original cellulose is 0.8:0.6:1, and react for 4 hours at 70°C to obtain Aminated cellulose;

[0034] (3) Add ethylene glycol, sodium hydroxide and carbo...

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Abstract

The invention discloses a method for preparing chelating agents for treating heavy metal in wastewater, and belongs to the field of technologies for treating wastewater. The method includes operation steps of (1), extracting starch in lotus roots, then synthesizing obtained lotus root residues to obtain lotus root celluloses, adding deionized water into the lotus root celluloses, regulating the deionized water and the lotus root celluloses to obtain solution with the concentration of 0.15 g / ml, adding 1-5 g of N, N'-methylene bisacrylamide and 1-5 g of gamma-aminopropyl triethoxysilane into every 100 ml of the solution and carrying out reaction to obtain modified celluloses; (2), adding ethylenediamine and triethylenetetramine into the modified celluloses and carrying out reaction to obtain aminated celluloses; (3), adding ethylidene glycol, sodium hydroxide and carbon disulfide into the aminated celluloses and carrying out reaction to obtain the cellulose chelating agents. The method has the advantages that natural polymeric chelating agents are subjected to modification treatment, and accordingly heavy metal ions in the wastewater can be trapped by the chelating agents; the treated heavy metal can be recycled, accordingly, secondary pollution can be prevented, and the method is an effective method for treating the wastewater.

Description

technical field [0001] The invention belongs to the technical field of removing impurities from industrial wastewater, and in particular relates to a preparation method of a chelating agent for treating heavy metals in wastewater. Background technique [0002] Heavy metal wastewater refers to wastewater containing heavy metals discharged from industrial production processes such as mining and metallurgy, machinery manufacturing, chemical industry, electronics, and instrumentation. Heavy metal (such as cadmium, nickel, mercury, zinc, etc.) wastewater is one of the most serious environmental pollution and one of the most harmful industrial wastewater to humans, and its water quality and quantity are related to the production process. Heavy metals in wastewater generally cannot be decomposed and destroyed, but can only transfer their existing positions and change their physical and chemical forms. For example, after chemical precipitation treatment, heavy metals in wastewater a...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J2220/4825C02F1/286C02F2101/20
Inventor 胡大苇
Owner 广州富生源环保工程有限公司