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Method for adsorptively removing sulfate ions in water by using composite material with laminated structure

A sulfate ion and composite material technology, applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of special reaction devices required for operation, high cost of modifying reagents, complex preparation process, etc. , to achieve the effect of low cost, little pollution and good settlement performance

Active Publication Date: 2015-12-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many deficiencies in these adsorbents. According to domestic and foreign scholars' research on natural ore and domestic production waste adsorbents such as montmorillonite, goethite, fly ash, etc., although the cost is low, the treatment effect is poor.
The effect of these two types of adsorbents can be improved after modification, but there are problems of complicated modification methods and high cost of modification reagents.
Most of the new artificially synthesized adsorbents have excellent effects, but in terms of material price, preparation method, and process operation, there are defects in high raw material cost, complicated preparation process, and special reaction equipment required for operation.

Method used

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  • Method for adsorptively removing sulfate ions in water by using composite material with laminated structure
  • Method for adsorptively removing sulfate ions in water by using composite material with laminated structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of L-glutamate zinc aluminum hydrotalcite / nitrate zinc aluminum hydrotalcite composite material: weigh 26.73gZn(NO 3 ) 2 ·6H 2 O, 11.25gAl(NO 3 ) 3 9H 2 O is completely dissolved in 120ml of water, and the content of metal ions in the solution is 1mol / L; 4.41g of L-glutamic acid is dissolved in 300ml of water to obtain a 100mmol / L glutamic acid solution; 40g of NaOH is dissolved in 1L of water, A 1mol / L NaOH solution was obtained. in N 2 protection, under the condition of 60℃ water bath, Zn(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 The mixed solution of O was gradually added dropwise to the glutamic acid solution, stirred during the dropwise addition, and the pH value was controlled to be 8 during the reaction process with 1mol / L NaOH solution. After the dropwise addition was completed, it was left to age for 4 hours. Wash 3 times with boiled deionized water and filter. The obtained precipitate was dried at 60° C. for 24 hours, and groun...

Embodiment 2

[0027] Structural characterization of L-glutamate zinc-aluminum hydrotalcite / nitrate zinc-aluminum hydrotalcite composites.

[0028] (1) Crystal form: X-ray powder instrument, the model is D8ADVANCE of Bruker Company in Germany, the experimental conditions are copper target, incident ray wavelength 0.15418 nm, Ni filter, tube pressure 40KV, tube flow 40mA, scan step size 0.02 degrees, scan speed 0.1 second / step, scanning range 2° to 70°, the result is as follows figure 1 As shown, the baseline of the X-ray diffraction pattern of the material of the present invention is stable, and there are strong diffraction peaks at 2θ of 6.8°, 13.5°, 20.5°, 34°, and 60°, showing that L-glutamate zinc aluminum hydrotalcite and nitric acid The characteristic diffraction peaks of zinc-aluminum hydrotalcite show that the L-glutamate zinc-aluminum hydrotalcite / nitrate zinc-aluminum hydrotalcite composite has a single crystal phase and a complete crystal structure.

[0029] (2) Qualitative analy...

Embodiment 3

[0031] L-glutamic acid zinc aluminum hydrotalcite / nitrate zinc aluminum hydrotalcite composite material adsorption to remove sulfate ion adsorption experiment in water, after the reaction solution was diluted 5 times, sulfate ion was determined by ICS-90 produced by Diane Company concentration.

[0032] (1) Determination of adsorption capacity under different adsorbent contents: at a temperature of 25°C and an oscillation rate of 180rpm, a shake flask experiment was carried out, and 0.16g, 0.14g, 0.12g, 0.10g, 0.08g of newly prepared L - The zinc-aluminum glutamate hydrotalcite / nitrate zinc-aluminum hydrotalcite composite material was added to 100ml of an aqueous solution with an initial sulfate ion concentration of 125mg / L, and the reaction time was 55min. The results are shown in Table 1. The experimental results show that the solid-liquid ratio is 1.4g / L, the adsorption effect is the best, and the adsorption capacity reaches 279.74mmol / g. The results of this implementation...

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Abstract

The invention discloses a method for adsorptively removing sulfate ions in water by using a composite material with a laminated structure. An L-zinc aluminum glutamate hydrotalcite / zinc aluminum nitrate hydrotalcite composite material is prepared by using a co-precipitation method to adsorptively treat the sulfate ions in the water. An experiment shows that absorption of the sulfate ions in the water by using the material has the characteristics of short absorption time, high adsorption capacity, high applicability and recyclability. In addition, the composite material in the method has the advantages of low cost, no pollution and easy separation, and has wide development and application prospects.

Description

field of invention [0001] The invention belongs to the technical field of material synthesis and water treatment, and in particular relates to a method for adsorbing and removing sulfate ions in water by a layered composite material. Background technique [0002] Sulfate wastewater widely exists in food production, pharmaceutical manufacturing, paper making, mining and other industries. If the sulfate-containing wastewater is directly discharged into the water body without treatment, the water quality will decline and the ecological balance will be destroyed; the generated sulfide and H 2 S is highly toxic and endangers the health of aquatic animals, plants and humans. At present, the methods for treating sulfate radical wastewater mainly include chemical precipitation, adsorption, ion exchange, membrane separation, freezing and other physical and chemical methods and biological methods. The chemical precipitation methods are mainly barium method and calcium method, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/58
Inventor 马邕文顾怡冰万金泉王艳
Owner SOUTH CHINA UNIV OF TECH
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