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Method for removing glyphosate in water body by using montmorillonite

A technology of glyphosate and montmorillonite, which is applied in the field of water pollution treatment, can solve the problems of slow treatment rate and external energy, and achieve the effects of rapid reaction, low cost and high adsorption efficiency

Inactive Publication Date: 2012-07-18
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have technical limitations such as the need for additional energy and slow processing rates.

Method used

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  • Method for removing glyphosate in water body by using montmorillonite
  • Method for removing glyphosate in water body by using montmorillonite
  • Method for removing glyphosate in water body by using montmorillonite

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Experimental program
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Effect test

Embodiment 1

[0028] The montmorillonite is purchased from Inner Mongolia. It is a calcium-based montmorillonite with a purity of 95%, a cation exchange capacity (CEC) of 115-139mmo1 / 100g, and a grinding particle size of ≤100 mesh. Dosing at a dose of 2 g / L into an aqueous solution containing 350 mg / L glyphosate and pH 2.95, adding FeCl 3 ·6H 2 O to 0.6 g / L, shake at 100 r / min at 25°C for 2 hours. The results showed that the removal rate of glyphosate in this state was 96.67%. Under the same conditions, the initial pH of the solution was adjusted with 0.1 mol / L HCl and NaOH so that the initial pH was 2, 4, 6, 8, 10, 12, respectively, and the corresponding removal rates were 95.76%, 97.32%, 98.05%, 98.05% %, 96.29%, 3.51%.

[0029] It can be seen that within the initial pH of 2~10, the pH basically has little effect on the removal rate of glyphosate in water, but if the initial pH reaches 12, this method will almost lose its effect on glyphosate, and the removal rate will drop sharply to ...

Embodiment 2

[0031] The montmorillonite was purchased in Inner Mongolia. It is a calcium-based montmorillonite with a purity of 95%, a CEC of 115-139mmo1 / 100g, and a grinding particle size of ≤100 mesh. Dosing at a dose of 2 g / L into an aqueous solution containing 350 mg / L glyphosate, pH 2.95 (natural pH), adding FeCl 3 ·6H 2 O to 0.6 g / L, shake at 100 r / min at 25°C for 5 minutes. The results showed that the removal rate of glyphosate in this state was 92.51%. Under the same conditions, the oscillation time was changed to 10, 20, 40, 60, 90, and 120 min, and the corresponding removal rates were 92.62%, 91.96%, 92.60%, 95.72%, 98.02%, and 97.24%, respectively.

[0032] It can be seen that the reaction reaches equilibrium within 5 minutes, which is very fast and easy to apply in actual wastewater engineering.

Embodiment 3

[0034] The montmorillonite was purchased in Inner Mongolia. It is a calcium-based montmorillonite with a purity of 95%, a CEC of 115-139mmo1 / 100g, and a grinding particle size of ≤100 mesh. Dosing at a dose of 2 g / L into an aqueous solution containing 350 mg / L glyphosate and pH 2.95, adding FeCl 3 ·6H 2 From 0 to 0.6 g / L, shake at 100 r / min at 25°C for 2 hours. The results showed that the removal rate of glyphosate in this state was 96.67%. Under the same conditions, the added FeCl 3 ·6H 2 The O content was adjusted to 0.05, 0.10, 0.16, 0.20, 0.40, 1.30, and 2 g / L, and the corresponding removal rates were 12.26%, 14.74%, 22.82%, 43.78%, 74.28%, 95.94%, and 95.47%, respectively.

[0035] It can be seen that FeCl 3 ·6H 2 The amount of O added is a controlling factor, FeCl 3 ·6H 2 The amount of O added has a linear relationship with the removal amount of glyphosate, which is determined by the removal mechanism, and FeCl can be adjusted in the application 3 ·6H 2 The amo...

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Abstract

The invention discloses a method for removing glyphosate in water body by using montmorillonite. The method comprises the following steps: grinding and drying montmorillonite, then adding glyphosate wastewater and a ferric salt, mixing evenly, performing solid-liquid separation at the reaction end point when the pH value is 2-4 and finishing the treatment, wherein the dosage of montmorillonite is2-10g / L and the dosage of the ferric salt is 0.3-1g / L. The method disclosed by the invention uses cheap raw material-montmorillonite and ferric chloride and can quickly realize the treatment of the glyphosate wastewater.

Description

[0001] technical field [0002] The invention belongs to the water pollution treatment technology in the field of environmental protection, and in particular relates to a method for removing glyphosate pollution in water by using montmorillonite combined with ferric iron. [0003] Background technique [0004] Glyphosate is the main active ingredient in the herbicide Roundup developed by Monsanto. Due to its high-efficiency, broad-spectrum and low-toxicity characteristics, the product quickly became the number one herbicide in sales after it was put into use in 1974. In recent years, due to the expansion of genetically modified crops, as well as the agricultural recovery and modernization of developing countries, the market demand has grown rapidly. In 1994, the global consumption of glyphosate technical was 42,500 tons, and in the following three years, it increased by about 20% every year. When Monsanto's glyphosate patent expired in 2001, Chinese companies developed ra...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/28
Inventor 任重刘云董元华孙含元
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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