Method of preparing modified hydrotalcite for removing trace mercury and cadmium ion in water

A technology for modifying water and removing water, which is applied in water/sewage treatment, chemical instruments and methods, and adsorption water/sewage treatment. The effect of high adsorption capacity and good mechanical strength

Inactive Publication Date: 2007-09-12
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have some shortcomings. Water washing can remove sediment and dust very well, but the removal effect on heavy metals is limited; the preparation processes such as ultrasonic wave, membrane separation, and macroporous adsorpti

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] Under the stirring condition of 60n / min, add salt solution (23.60g magnesium nitrate hexahydrate, 17.20 g aluminum nitrate nonahydrate, slowly added to 720ml distilled water under stirring) and aspartic acid solution (concentration 0.027g / ml, 90ml), dropwise for 1h, and keep the solution alkaline. After shaking in a water bath at a temperature of 65° C. for 1 hour, it was aged at a temperature of 25° C. for 24 hours to form a stable skeleton structure. After the aging is complete, wash until the chloride ion content in the water is less than 10 mg / L, heat and dry the solid at 110°C for 18 hours, and cool down naturally to obtain a mercury and cadmium adsorbent with an average pore size of 0.1mm. When this adsorbent is used to treat raw water with a mercury ion content of 0.01mg / L and a cadmium ion content of mg / L, the premise of ensuring that the mercury ion content of the effluent is lower than 0.001mg / L and the cadmium ion content is lower than 0.005mg / L Below, the a...

example 2

[0028] Under the stirring condition of 50n / min, add salt solution (11.80g magnesium nitrate hexahydrate, 8.60 g aluminum nitrate nonahydrate, slowly added to 360ml distilled water under stirring) and glutamic acid solution (concentration 0.0086g / ml, 200ml), dropwise for 1h, and keep the solution alkaline. After shaking in a water bath at a temperature of 70° C. for 1.5 hours, it was aged at a temperature of 25° C. for 20 hours to form a stable skeleton structure. After the aging is complete, wash until the chloride ion content in the water is less than 10 mg / L, freeze-dry the solid at -67°C for 14 hours, and cool down naturally to obtain an adsorbent for removing mercury and cadmium with an average pore size of 0.1mm. When this adsorbent is used to treat raw water with a mercury ion content of 0.01mg / L and a cadmium ion content of mg / L, the premise of ensuring that the mercury ion content of the effluent is lower than 0.001mg / L and the cadmium ion content is lower than 0.005mg...

example 3

[0030] Under the stirring condition of 65n / min, add salt solution (23.60g magnesium nitrate hexahydrate, 17.20 g aluminum nitrate nonahydrate, slowly added to 720ml distilled water under stirring) and aspartic acid solution (concentration 0.027g / ml, 90ml), dropwise for 1h, and keep the solution alkaline. After shaking in a water bath at a temperature of 60° C. for 1 hour, it was aged at a temperature of 25° C. for 24 hours to form a stable skeleton structure. After the aging is complete, wash until the chloride ion content in the water is less than 10mg / L, heat and dry the solid at 110°C for 18 hours, and cool down naturally to obtain a mercury and cadmium adsorbent with an average pore size of 0.1mm. This adsorbent is used to treat breviscapine extract with a cadmium content of 0.22mg / kg, and the cadmium content after adsorption is lower than 0.12mg / kg; this adsorbent is used to treat tea polyphenol extracts with a cadmium content of 0.18mg / kg , the cadmium content after ads...

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Abstract

This invention discloses a method for preparing modified water-talcum for eliminating minim Hg and Cd ions, which takes amino acid as the main modified source to modify water-talcum and utilizes water-phase deposition thermal crystallization method to prepare it and realize optimization on structure by controlling the way of drying. Advantages: apart from having good mechanical strength and uniform grains, the Hg and Cd sorbent can adsorb marks, minim Hg and Cd ions in water and plant extracted materials quickly at large volume.

Description

technical field [0001] The invention relates to a preparation method of an adsorbent used for removing traces, trace amounts of mercury and cadmium in water systems and plant extracts, and belongs to the field of new materials. Background technique [0002] The method of decontamination of drinking water is gradually developed and perfected by human beings in response to the constant changes of water pollution. Waste and wastewater from metal processing and smelting, thermal power generation, coal mines, electric appliance battery production, and electronic products are the main sources of heavy metal pollution such as mercury, cadmium, chromium, and lead. These heavy metals directly seep into groundwater through rainwater washing or undergo biological and chemical reactions Cause secondary pollution to groundwater. At present, there are various methods to deal with water containing heavy metals such as mercury and cadmium, but they can be generally classified into physical...

Claims

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Application Information

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IPC IPC(8): C02F1/62C02F1/28
Inventor 那平杨曙锋张帆曾云恒朱阳明毕慧超韩晞
Owner TIANJIN UNIV
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