Preparation method and application of modified zeolite permeable reactive wall filling carrying zero-valent iron powder

A technology of osmotic reaction wall and modified zeolite, which is applied in the field of preparation of osmotic reaction wall filler, can solve the problems of engineering application limitation, difficult repair effect, difficult reaction process control, etc., and achieve the effect of solving the loss of iron powder

Inactive Publication Date: 2014-05-07
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the loss of zero-valent iron under the above circumstances, it is difficult to achieve a good repair effect by using the modified clinoptilolite permeation reaction wall added with zero-v

Method used

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  • Preparation method and application of modified zeolite permeable reactive wall filling carrying zero-valent iron powder
  • Preparation method and application of modified zeolite permeable reactive wall filling carrying zero-valent iron powder
  • Preparation method and application of modified zeolite permeable reactive wall filling carrying zero-valent iron powder

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Experimental program
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Effect test

Embodiment 1

[0029] The present invention will be described in detail below through Embodiment 1 in conjunction with the accompanying drawings.

[0030] Clinoptilolite was purchased from Zhengzhou, Henan, with a bulk density of 1.6g / cm 3 . The detailed steps are as follows:

[0031] 1) The 1-2mm clinoptilolite screened out with a standard sieve was washed 5 times with distilled water, and dried at 105°C for later use.

[0032] 2) Take a sufficient amount of the dried clinoptilolite, immerse it in 18g / L CTAB-Br solution, and modify it in a constant temperature shaker at 25°C and 150r / min for 24h. Get 1-b figure.

[0033] 3) Wash the modified clinoptilolite with distilled water 5 times, and dry at 105°C for later use.

[0034] 4) Add 36g of 200 mesh iron powder into 30mL of 15g / L sodium alginate solution, and stir well to form a mixture of iron powder and sodium alginate solution.

[0035] 5) Take 90mL (144g) of the modified zeolite dried in step 3) and put it into the mixed solution fo...

Embodiment 2

[0041] The difference from Example 1 is that the dosage of iron powder and the dosage of modified zeolite are changed. The preparation and implementation process of other required materials are the same as in Example 1. According to the initial iron powder dosage is 20% of the total mass of the initial iron powder and modified zeolite, the volume ratio of modified zeolite to sodium alginate solution is 3.5:1. The modified clinoptilolite-loaded zero-valent iron powder filler with a fixed iron powder content of 14.1% was prepared.

Embodiment 3

[0043] The difference from Example 1 is that the dosage of iron powder and the dosage of modified zeolite are changed. The preparation and implementation process of other required materials are the same as in Example 1. According to the initial iron powder dosage is 5% of the total mass of the initial iron powder and modified zeolite, the volume ratio of modified zeolite to sodium alginate solution is 3.5:1. The modified clinoptilolite-loaded zero-valent iron powder filler with the fixed iron powder content of 1.0% was prepared.

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Abstract

The invention discloses a preparation method and the application of modified zeolite permeable reactive wall filling carrying zero-valent iron powder, and belongs to the field of underground water environment modification. The method comprises the following steps: soaking clinoptilolite in 16-20g/L of cetyl trimethyl ammonium bromide (CTAB) Br solution, and modifying the clinoptilolite for over 12h in a constant-temperature shaking table at normal temperature; washing the modified clinoptilolite for 5-6 times with distilled water, and drying the clinoptilolite for later use; adding iron powder into 10-30g/L of sodium alginate solution; performing full and uniform stirring to form a mixture of the iron powder and the sodium alginate solution; performing full stirring to uniformly disperse the mixture of the iron powder and the sodium alginate solution on the surface of the modified zeolite; pouring the mixture into 20-40g/L of CaCl2 solution, and soaking and maintaining the mixture for 24h with the CaCl2 solution; stirring and washing the mixture with hydrochloric acid, and then washing the mixture to be neutral with the distilled water. According to the preparation method, the problem of loss of the iron powder is effectively solved, and the removal rate of hexavalent chromium with modified zeolite filling carrying the iron powder is two times of the removal rate of the hexavalent chromium with the modified zeolite.

Description

Technical field: [0001] The invention belongs to the field of groundwater environment restoration, and in particular relates to a preparation method of an infiltration reaction wall filler capable of removing Cr(VI) and loading zero-valent iron powder with modified zeolite. Background technique: [0002] Chromium often exists in the form of hexavalent chromium and trivalent chromium in nature. Hexavalent chromium is a proven "three-cause" pollutant that can cause a series of health problems. It is widely used in steelmaking, electroplating, tanning, wood preservation and other production processes. The unreasonable disposal of wastes containing hexavalent chromium in these processes and the leakage of solutions containing hexavalent chromium will lead to contamination of groundwater. Serious pollution of hexavalent chromium. Therefore, it is urgent to remediate the groundwater polluted by hexavalent chromium. Contrary to hexavalent chromium, trivalent chromium is a basic ...

Claims

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Application Information

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IPC IPC(8): B01J19/30C02F1/28C02F1/70C02F101/22
Inventor 张永祥党宏钰杜珮雯
Owner BEIJING UNIV OF TECH
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