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
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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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