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Environment-friendly and low-cost method for eluting pollutants on absorbent surface

A technology of pollutants and adsorbents, which is applied in the field of eluting heavy metal pollutants on the surface of metal oxide adsorbents, and can solve problems such as complex technical conditions, increased costs, and secondary pollution

Inactive Publication Date: 2009-09-23
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the pickling method has a high elution efficiency, the acid and eluent introduced by itself are corrosive; the ion exchange method is most commonly used to elute the cationic pollutants on the surface of the metal oxide adsorbent, but the eluent used The concentration is generally high, and must be in acidic conditions to have a certain elution efficiency, which not only increases the cost, but also causes secondary pollution; in addition, the method of catalytic oxidation regeneration is currently a relatively advanced method, although it has high efficiency , will not cause secondary pollution, etc., but the technical conditions required by this method are relatively complicated, and it is not suitable for use in rural areas

Method used

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  • Environment-friendly and low-cost method for eluting pollutants on absorbent surface
  • Environment-friendly and low-cost method for eluting pollutants on absorbent surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation of the adsorbent of embodiment 1 load heavy metal pollutants

[0017] Weigh 0.03g anatase TiO 2 , dissolved in 28.5ml of ultrapure water, stirred at 25°C for 2h, then added 1.5ml to a concentration of 1g·L -1 Zn solution, adjust the pH value of the adsorption system to keep it near 6.4, and balance for 12h. Centrifuge the above fully reacted mixed solution, pour off the supernatant, and the obtained solid part is the adsorbent required for the elution test.

Embodiment 2

[0018] The elution effect under the different ionic strengths of embodiment 2

[0019] With 30ml, the sodium chloride solution that mass fraction is respectively 0, 0.5‰, 5‰, is poured into the adsorbent solid surface that has loaded heavy metal Zn prepared in the example 1, makes it fully mix, under 25 ℃ of conditions, Shake for 2 hours, then centrifuge for 10 minutes, take the supernatant to pass through a 0.22 micron filter membrane, measure the Zn content in the supernatant, and calculate the elution efficiency. The experiment was repeated to obtain the efficiency of the secondary elution. The result is as figure 2 shown. Depend on figure 2 It can be seen that with the increase of the mass fraction of sodium chloride, the elution rate gradually increased from 15% to 40%.

Embodiment 3

[0020] The elution effect under the different temperature conditions of embodiment 3

[0021] According to the same operating conditions as in Example 2, the temperatures were respectively controlled at 4°C, 25°C, and 45°C, and the elution efficiencies were measured respectively. from figure 2 It can be seen that the elution efficiency is significantly higher at low temperature than at high temperature.

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Abstract

The invention provides a method for regenerating a metal oxide absorbent already absorbing pollutants. The principle is that a salt solution with the conditions corresponding to the rightmost pH edge is used for eluting the absorbent under the condition that pH is natural or slightly acidic, namely at the position with the maximal displacement, by using he characteristic that heavy metal pollutants displace at the pH changing edge absorbed on the metal oxide surface under the conditions of different ionic strengths and different temperatures, the acidity-basicity of the eluted solution is not changed obviously and the solution is harmless to environment. Taking the elution of heavy metal Zn absorbed on nanometre-sized TiO2 surface for example, cold salt water containing 0.5% of NaCl at 4 DEG C is used for eluting the absorbent with saturated surface absorption, the elution efficiency is more than 40%, and the pH of the eluted absorbent is about 6.4.

Description

technical field [0001] The invention relates to an environment-friendly, cheap and easy method for eluting heavy metal pollutants on the surface of a metal oxide adsorbent. The invention belongs to the technical field of water treatment. Background technique [0002] my country is a country short of water resources, and the per capita fresh water resources are only about 20% of the world's average level. Among the few fresh water resources, due to unreasonable use and water pollution in recent years, fresh water resources in many big cities have been severely strained, threatening people's health and national economic development. With the acceleration of urbanization and the rapid development of industry and agriculture, most cities in the country have serious water quality problems to varying degrees, such as a large amount of untreated urban garbage, polluted soil, industrial wastewater and domestic sewage, and Atmospheric sediments are continuously discharged into the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/34
Inventor 陈灏高爽周莹李垒
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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