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Application of roasted product of magnesia-alumina hydrotalcite in adsorption treatment of naphthol green B

A roasting product, adsorption treatment technology, applied in the preparation of organic compounds, nitro/nitroso dyes, organic chemistry, etc., can solve the problems of low treatment efficiency and secondary pollution of naphthol green B, and achieve fast adsorption rate , easy recycling, high adsorption capacity

Active Publication Date: 2009-03-11
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings of low treatment efficiency of naphthol green B in the current technology and easy to cause secondary pollution, the invention provides the application of magnesium aluminum binary hydrotalcite in the adsorption treatment of naphthol green B in water

Method used

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  • Application of roasted product of magnesia-alumina hydrotalcite in adsorption treatment of naphthol green B
  • Application of roasted product of magnesia-alumina hydrotalcite in adsorption treatment of naphthol green B
  • Application of roasted product of magnesia-alumina hydrotalcite in adsorption treatment of naphthol green B

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Experimental program
Comparison scheme
Effect test

Embodiment 1～8

[0032]Prepare 8 parts of naphthol green B concentration and be the 100ml waste water of 200mg / L, take by weighing 8 parts of 100mg magnesium aluminum hydrotalcite roasting product, add respectively to be treated in the waste water that contains naphthol green B concentration and be 200mg / L, with 0.01mol / L NaOH and 0.01mol / L HCl control the pH to 10, the temperature is 45°C, and the stirring time is 20, 40, 60, 80, 100, 120, 140, and 160 min, respectively. After stirring, centrifuge, get the supernatant to measure the solution concentration after adsorption, the material changes with time to the adsorption amount of naphthol green B, see figure 1 .

[0033] Conclusion: In 100ml of naphthol green B wastewater solution with a concentration of 200mg / L, 100mg of magnesium aluminum hydrotalcite roasting product was added, and the adsorption equilibrium was reached after 100min at pH 10 and temperature 45°C.

Embodiment 9～13

[0035] Prepare 5 parts of naphthol green B concentration and be the 100ml waste water of 200mg / L, take by weighing 5 parts of 100mg magnesium aluminum hydrotalcite roasting product, add respectively in the concentration to be treated in the naphthol green B waste water of 100mg / L, control temperature is At 45°C, adjust the pH to 4, 6, 8, 10, and 12 with 0.01mol / L NaOH and 0.01mol / L HCl, respectively, and stir for 120 minutes. After stirring, centrifuge, and take the supernatant to measure the adsorption solution concentration. The variation of the adsorption amount of naphthol green B by the material with pH is shown in figure 2 .

[0036] Conclusion: Add 100 mg of magnesium aluminum hydrotalcite roasting product to 100 ml of naphthol green B wastewater solution with a concentration of 200 mg / L, and the temperature is 45 ° C. Adsorption is performed under different pH conditions. When pH = 10, the adsorption capacity is the largest. It can reach 194mg / g.

Embodiment 14～19

[0038] Prepare six parts of wastewater 100ml with a concentration of naphthol green B of 200mg / L, weigh six parts of 100mg magnesium aluminum hydrotalcite roasting products, and add them respectively to the wastewater of naphthol green B with a concentration of 100mg / L to be treated, with 0.01mol / L NaOH and 0.01mol / L HCl control the pH=10, and the temperature is 25, 35, 45, 55, 65, 75°C respectively. After stirring, the stirring time is 120min, centrifuged, and the supernatant is taken to measure the solution concentration after adsorption, and the adsorption amount of naphthol green B obtained by the material varies with temperature, see image 3 .

[0039] Conclusion: Add 100 mg of magnesium aluminum hydrotalcite roasting product to 100 ml of naphthol green B wastewater solution with a concentration of 200 mg / L, pH = 10, and adsorb at different temperatures. When the temperature is 45 ° C, the adsorption capacity is the largest, which can reach 194mg / g.

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Abstract

The invention provides application of binary magnesium-aluminum hydrotalcite in absorption treatment of naphthol green B in a water body. A roasted product obtained by roasting the binary magnesium-aluminum hydrotalcite for 4 to 7 hours at a temperature of between 400 and 600 DEG C is used for adsorbing the naphthol green B in the water body, a general formula of the binary magnesium-aluminum hydrotalcite is [Mg<2+>(1-x)Al<3+>x(OH)2](CO2<2->)x / 2.mH2O, wherein in the formula, x is the ratio of the amount of Al<3+> to Mg<2+>+Al<3+> and is more than 0.2 and less than 0.4, and m is the number of crystallization water. The application has the advantages that the roasted product of the binary magnesium-aluminum hydrotalcite is used for adsorbing the naphthol green B in wastewater solution, has high adsorption capacity and quick adsorption rate; and a material after the adsorption is easy to recover and reutilize.

Description

(1) Technical field [0001] The invention relates to the application of the calcined product of magnesium-aluminum binary hydrotalcite in adsorption treatment of naphthol green B. (2) Background technology [0002] The dyestuff industry is an industry that produces a lot of sewage in the chemical industry, and the wastewater discharged during production and use has always been a problem that is difficult to effectively solve. Dye wastewater has the characteristics of high COD, high chroma, complex organic components, stable chemical properties, and low degree of microbial degradation. The flocculation and biological oxidation methods often cannot achieve satisfactory results. Naphthol Green B, as a commonly used organic dye, is mostly used for dyeing wool and some chemical fiber fabrics. Naphthol Green B has good water solubility, and the naphthalene ring in the molecule is a relatively stable group, which is not easy to be oxidized and degraded. Therefore, naphthol green B...

Claims

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Application Information

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IPC IPC(8): C07C309/47C07C303/44B01J20/04C09B67/54C09B51/00
Inventor 倪哲明张峰毛江洪
Owner ZHEJIANG UNIV OF TECH
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