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Adsorbent for removing chromate ions from water, and preparation method thereof

A chromate and water removal technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, water pollutants, etc., can solve the problem of low chromate ion removal efficiency, etc., and achieve high dechromate efficiency and optimization. Removal efficiency, less dosage effect

Inactive Publication Date: 2019-04-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One of the technical problems to be solved by the present invention is to provide a new adsorbent for removing chromate ions in water in order to overcome the problem of low removal efficiency of chromate ions in the industrial wastewater solution existing in the prior art

Method used

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  • Adsorbent for removing chromate ions from water, and preparation method thereof
  • Adsorbent for removing chromate ions from water, and preparation method thereof
  • Adsorbent for removing chromate ions from water, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Dissolve cobalt nitrate, zinc nitrate and ferric nitrate in deionized water at a molar ratio of 4:2:2, stir at room temperature until clear, and record it as solution A; dissolve sodium hydroxide in deionized water, stir at room temperature until clear , recorded as solution B; quickly drop solution B into solution A, stop when the pH value of the solution reaches 9.0, continue to stir for 2 hours, pour the solution into a crystallization kettle and treat it with hydrothermal treatment at 110°C for 5 hours, filter, wash, and dry at 110 ℃ drying for 10h to obtain the adsorbent product A.

[0035] Add 10 g of adsorbent A to 1 L of aqueous solution containing 500 mg of chromate ions at 20° C., stir for 20 minutes and then detect the content of chromate ions in the water. The results are listed in Table 1.

Embodiment 2

[0037]Dissolve cobalt nitrate, zinc nitrate and ferric nitrate in deionized water at a molar ratio of 2:4:2, stir at room temperature until clear, and record it as solution A; dissolve sodium hydroxide in deionized water, stir at room temperature until clear , recorded as solution B; quickly drop solution B into solution A, stop when the pH value of the solution reaches 9.0, continue to stir for 2 hours, pour the solution into a crystallization kettle and treat it with hydrothermal treatment at 110°C for 5 hours, filter, wash, and dry at 110 ℃ drying for 10h to obtain the adsorbent product B.

[0038] Add 10 g of adsorbent B to 1 L of aqueous solution containing 500 mg of chromate ions at 20° C., stir for 20 minutes and then detect the content of chromate ions in the water. The results are listed in Table 1.

Embodiment 3

[0040] Dissolve cobalt nitrate, zinc nitrate and ferric nitrate in deionized water at a molar ratio of 3:3:2, stir at room temperature until clear, and record it as solution A; dissolve sodium hydroxide in deionized water, stir at room temperature until clear , recorded as solution B; quickly drop solution B into solution A, stop when the pH value of the solution reaches 9.0, continue to stir for 2 hours, pour the solution into a crystallization kettle and treat it with hydrothermal treatment at 110°C for 5 hours, filter, wash, and dry at 110 C and dried for 10 hours to obtain the adsorbent product C.

[0041] Add 10 g of Adsorbent C to 1 L of aqueous solution containing 500 mg of chromate ions at 20°C, stir for 20 minutes and then detect the content of chromate ions in the water. The results are listed in Table 1.

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Abstract

The invention relates to an adsorbent for removing chromate ions from water, and a preparation method thereof. In the prior art, the removal efficiency of the chromate ions in the industrial wastewater solution is not high. A purpose of the present invention is mainly to solve the problem in the prior art. According to the technical scheme, a metal complex CoxZn6-xFe2(OH)18.4H2O as an adsorbent isprepared by combining co-precipitation and hydrothermal treatment, and x is 2-5. With the technical scheme, the problem in the prior art is well solved. According to the present invention, the adsorbent prepared by the method can efficiently remove chromate ions from water, and can be used in the field of environmental protection.

Description

technical field [0001] The invention relates to an adsorbent for removing chromate ions in water and a preparation method thereof. Background technique [0002] Chromium is a harmful pollutant, and it mainly exists in two forms of +3 valence and +6 valence in the natural environment. Hexavalent chromium is more toxic and reactive than trivalent chromium. In chromium-containing wastewater, chromium is usually expressed as CrO 4 2- and Cr 2 o 7 2- Other anionic forms exist. Chromium entering the environment not only pollutes soil, surface and groundwater, but also can endanger human health through the food chain. At present, the technologies used to treat sewage containing chromate ions mainly include: reduction precipitation method, ion exchange method, evaporation recovery method and adsorption method. The development of efficient and cheap adsorbents by various environmental protection agencies to remove pollutants in water bodies through adsorption has become a res...

Claims

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Application Information

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IPC IPC(8): B01J20/06B01J20/28B01J20/30C02F1/28C02F101/22
CPCB01J20/06B01J20/28033C02F1/281C02F2101/22
Inventor 李旭光孔德金陈燕邹薇
Owner CHINA PETROLEUM & CHEM CORP
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