Method for removing hexavalent chromium from water by using polyaniline-modified palygouskite

A technology for modifying attapulgite and attapulgite, which is applied in the field of water pollution treatment, can solve the problems of poor adsorption efficiency, low adsorption rate, small adsorption capacity of adsorbents, etc., and achieves low cost, fast adsorption rate and simple operation. Effect

Inactive Publication Date: 2012-02-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method for utilizing polyaniline-modified attapulgite to remove hexavalent chromium in water, which can overcome the small adsorption capacity and low adsorption rate of the existing adsorption methods. And the shortcomings of ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First prepare polyaniline modified attapulgite, comprising the following steps:

[0024] In the first step, under the condition of an ice-water bath, dissolve 2.17g of aniline and 0.36g of p-phenylenediamine in 60mL of hydrochloric acid solution with a concentration of 1mol / L, then add 5.0g of attapulgite, stir evenly, and the attapulgite Before adding the soil, first mix attapulgite and water at a mass ratio of 1:10, and ultrasonically disperse for 10 minutes;

[0025] The second step, the ammonium persulfate of 1.63g is dissolved in the hydrochloric acid solution that 16mL concentration is 1mol / L;

[0026] In the third step, the solutions obtained in the first two steps were mixed and polymerized for 1 hour, and left standing at room temperature for 14 hours, and then filtered, washed, and dried to obtain polyaniline-modified attapulgite composite particles.

[0027] The prepared polyaniline-modified attapulgite was used as an adsorbent to treat water polluted by hex...

Embodiment 2

[0030] Firstly, polyaniline-modified attapulgite was prepared, and the preparation process was consistent with that of Example 1.

[0031] The prepared polyaniline-modified attapulgite was used as an adsorbent to treat water polluted by hexavalent chromium with an initial concentration of 5 mg / L.

[0032] Put the polluted water containing hexavalent chromium in an airtight container, add the adsorbent according to the mass ratio of adsorbent: polluted water = 1:2000, adjust the pH of the polluted water to 5.7±0.2, oscillate at a constant temperature of 25°C, and absorb The time is 24h. After 24 hours, the adsorption amount of hexavalent chromium was measured to be 9.48mg / g, and the removal rate was 97.2%. The removal rate of hexavalent chromium refers to the ratio of the concentration of adsorbed hexavalent chromium to the initial concentration.

Embodiment 3

[0034] Firstly, polyaniline-modified attapulgite was prepared, and the preparation process was consistent with that of Example 1.

[0035] The prepared polyaniline-modified attapulgite was used as an adsorbent to treat water polluted by hexavalent chromium with an initial concentration of 10 mg / L.

[0036] Put the polluted water containing hexavalent chromium in an airtight container, add the adsorbent according to the mass ratio of adsorbent: polluted water = 1:2000, adjust the pH of the polluted water to 5.7±0.2, oscillate at a constant temperature of 25°C, and absorb The time is 24h. After 24 hours, the adsorption amount of hexavalent chromium was measured to be 13.26 mg / g, and the removal rate was 61.7%. The removal rate of hexavalent chromium refers to the ratio of the concentration of adsorbed hexavalent chromium to the initial concentration.

[0037] It can be seen that in the lower concentration range, the removal rate of polyaniline-modified attapulgite to hexavalen...

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Abstract

The invention discloses a method for removing hexavalent chromium from water by using polyaniline-modified palygouskite. The method comprises the following steps of: dissolving aniline and p-phenylenediamine in a 1 mol/L hydrochloric acid solution under the condition of ice water bath, adding palygouskite, and uniformly stirring; then dissolving ammonium persulfate in another 1 mol/L hydrochloric acid solution; and performing polymerization reaction on solutions obtained in the previous steps, standing at room temperature, filtering, washing, drying to obtain polyaniline-modified palygouskite composite particles, and mixing the obtained polyaniline-modified palygouskite composite particles and water from which hexavalent chromium is to be removed in a mass ratio of 1:(800-5,000) to effectively remove hexavalent chromium from wastewater of which hexavalent chromium initial concentration is 2.5 to 35mg/L. The method overcomes defects of low adsorption capacity, rate and efficiency of adsorbent in the conventional adsorption method; and by the method, pollution and damage of hexavalent chromium to water are effectively controlled.

Description

technical field [0001] The invention belongs to the field of water pollution treatment and relates to the removal of hexavalent chromium in water, in particular to a method for removing hexavalent chromium in water by using polyaniline modified attapulgite. Background technique [0002] Chromium is a silvery-white, hard metal. It mainly appears in three forms of metallic chromium, trivalent chromium and hexavalent chromium. All chromium compounds are toxic, of which hexavalent chromium is the most toxic. Metal processing, electroplating, and tanning industries, the waste water and waste gas discharged from these industries are the main sources of pollution in the environment and the main source of hexavalent chromium. Hexavalent chromium is easily absorbed by the human body. It can invade the human body through digestion, respiratory tract, skin and mucous membranes. It has carcinogenic effects in the human body and can cause other health problems, such as inhalation of hi...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/22
Inventor 王家宏韩晓晶马宏瑞毕丽娟
Owner SHAANXI UNIV OF SCI & TECH
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