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Composite mercury removal material, and preparation method and application thereof

A reaction and mixed salt technology, applied in the field of composite mercury removal materials and its preparation, can solve problems such as unstable mercury removal efficiency, unsatisfactory repeated adsorption performance, and limited adsorption capacity

Active Publication Date: 2021-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the technical problem to be solved by the present invention is to provide a composite mercury removal material to solve the problems of unstable mercury removal efficiency, limited adsorption capacity and unsatisfactory repeated adsorption performance after regeneration in mercury adsorption materials in the prior art;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] The preparation method of the composite mercury removal material described in this embodiment comprises the following steps:

[0077] (1) Preparation of hydrotalcite

[0078] Prepare 2L Mg(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 Mixed magnesium-iron salt solution of O, control Mg in the solution 2+ The concentration is 0.6mol / L, Fe 3+ The concentration is 0.15mol / L;

[0079] Prepare 2LNaOH and Na 2 CO 3 The mixed alkali solution, control the Na in the solution 2 CO 3 The concentration of NaOH is 0.3mol / L, and the concentration of NaOH is 1.5mol / L;

[0080] After adding 4L of deionized water into the 10L reactor, add the mixed magnesium-iron salt solution and the mixed alkali solution dropwise into the reactor at a rate of 400ml / h, while vigorously stirring to control the pH value of the mixed stirring solution in the reactor 9; after the titration, the slurry was stirred at 60°C and aged for 12 hours; after aging, the formed hydrotalcite was filtered, washed ...

Embodiment 2

[0098] The preparation method of the composite mercury removal material described in this embodiment comprises the following steps:

[0099] (1) Preparation of hydrotalcite

[0100] Prepare 2L Mg(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 Mixed magnesium-iron salt solution of O, control Mg in the solution 2+ The concentration is 0.8mol / L, Fe 3+ The concentration is 0.2mol / L;

[0101] Prepare 2L NaOH and NaOH 2 CO 3 The mixed alkali solution, control the Na in the solution 2 CO 3 The concentration of NaOH is 0.4mol / L, and the concentration of NaOH is 2.0mol / L;

[0102] After adding 4L of deionized water into the 10L reactor, add the mixed magnesium-iron salt solution and the mixed alkali solution dropwise into the reactor at a rate of 600ml / h, while vigorously stirring to control the pH value of the mixed stirring solution in the reactor After the titration, the slurry was kept at 60°C for 12 hours and aged for 12 hours; after aging, the formed hydrotalcite was filtered...

Embodiment 3

[0120] The preparation method of the adsorbent material applied to waste water mercury removal described in this embodiment comprises the following steps:

[0121] (1) Preparation of hydrotalcite

[0122] Prepare 2L Mg(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 Mixed magnesium-iron salt solution of O, control Mg in the solution 2+ The concentration is 0.7mol / L, Fe 3+ The concentration is 0.18mol / L;

[0123] Prepare 2LNaOH and Na 2 CO 3 The mixed alkali solution, control the Na in the solution 2 CO 3 The concentration of NaOH is 0.35mol / L, and the concentration of NaOH is 1.8mol / L;

[0124] After adding 5L of deionized water into the 10L reactor, add the mixed magnesium-iron salt solution and the mixed alkali solution dropwise into the reactor at a rate of 500ml / h, while vigorously stirring to control the pH value of the mixed stirring solution in the reactor 9.5; after the titration, the slurry was kept at 60°C and stirred for 12 hours; after aging, the formed hydrotal...

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Abstract

The invention belongs to the technical field of sewage treatment materials, and particularly relates to a composite mercury removal material, and a preparation method and application thereof. According to the preparation method of the composite mercury removal material, hydrotalcite with an adjustable and controllable interlayer structure and polypyrrole modified montmorillonite are prepared as raw materials, and the hydrotalcite is subjected to delamination separation through N, N-dimethylformamide, so that a dispersed lamellar structure is formed; the montmorillonite is subjected to acidification, sodium modification and ferric trichloride intercalation treatment, and the intercalated montmorillonite is modified by polypyrrole, so that three-dimensional multi-layer steric hindrance is formed, and the exchange capacity in the modification process is improved; and a polyhydroxy layered structure composite material with a spatial domain effect is further formed by utilizing a mode of carrying out composite intercalation on hydrotalcite and montmorillonite, and then sulfydryl modification is carried out by utilizing the specific polyhydroxy layered structure of the material, so as to prepare the modified adsorption material which can be applied to adsorbing Hg<2+> in mercury-containing wastewater. The adsorption efficiency and the adsorption capacity are relatively good.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment materials, and in particular relates to a composite mercury removal material and its preparation method and application. Background technique [0002] Mercury, commonly known as mercury, has attracted widespread attention due to its characteristics of being highly toxic, bioaccumulative, volatile, easy to migrate and transform, and difficult to biodegrade. Mercury can accumulate in organisms and is easily absorbed by the skin, respiratory tract and digestive tract. Listed as a global pollutant. Currently, China's discharge standards for mercury-containing wastewater require that the concentration of mercury in the effluent is not higher than 5 μg / L. Therefore, how to effectively remove mercury contained in wastewater is a difficult problem in the field of sewage and wastewater treatment. Traditional mercury treatment processes in the prior art include chemical precipitation, activated c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/20
CPCB01J20/041B01J20/12B01J20/262B01J20/22C02F1/281C02F1/285B01J2220/46B01J2220/4812B01J2220/4806C02F2101/20Y02P10/20
Inventor 李波刘婷婷潘咸峰黄斌袁辉志
Owner CHINA PETROLEUM & CHEM CORP
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