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A soil heavy metal cadmium adsorption microsphere

A technology for adsorbing microspheres and heavy metals, which is applied to the recovery of alkali metal compounds, contaminated soil, and alkali metal oxides/hydroxides. It can solve the problems of irreversibility, easy accumulation, and heavy metals that cannot be degraded by microorganisms. The effect of high efficiency, simple manufacturing process, good research value and application prospect

Active Publication Date: 2016-08-10
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) Irreversibility, heavy metals entering the soil cannot be degraded by microorganisms and are easy to accumulate
The application of sodium polyacrylate in remediation of heavy metal contaminated soil has not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1 A method for preparing soil heavy metal cadmium adsorption microspheres, including the following steps:

[0016] (1) Dissolve sodium alginate and sodium polyacrylate powder in deionized water under 20-50℃ water bath conditions to prepare a sodium alginate-sodium polyacrylate mixed solution. The quality of sodium alginate and sodium polyacrylate in the solution The percentages are 2% and 8% respectively, and deionized water accounts for 90% of the mass of the solution. Transfer the mixed solution to the syringe connected to the syringe pump;

[0017] (2) Dissolve calcium chloride in deionized water to prepare a calcium chloride solution, the mass fraction of calcium chloride in the calcium chloride solution is 3.5%;

[0018] (3) Drop the sodium alginate-sodium polyacrylate mixed solution into the prepared calcium chloride solution through a syringe;

[0019] (4) The prepared microspheres are separated from the calcium chloride solution by filtration, washed with de...

Embodiment 2

[0020] Embodiment 2 A preparation method and application of soil heavy metal cadmium adsorption microspheres, including the following steps:

[0021] (1) Dissolve sodium alginate and sodium polyacrylate powder in deionized water under 20-50℃ water bath conditions to prepare a sodium alginate-sodium polyacrylate mixed solution. The quality of sodium alginate and sodium polyacrylate in the solution The percentages are 2% and 8% respectively, and deionized water accounts for 90% of the mass of the solution. Transfer the mixed solution to the syringe connected to the syringe pump;

[0022] (2) Dissolve calcium chloride in deionized water to prepare a calcium chloride solution, the mass fraction of calcium chloride in the calcium chloride solution is 3.5%;

[0023] (3) Drop the sodium alginate-sodium polyacrylate mixed solution into the prepared calcium chloride solution through a syringe;

[0024] (4) The prepared microspheres are separated from the calcium chloride solution by filtratio...

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Abstract

The invention discloses a soil heavy metal cadmium adsorption microsphere. Firstly, sodium alginate and sodium polyacrylate powder are dissolved in deionized water, and then the mixed solution of sodium alginate and sodium polyacrylate is added dropwise into calcium chloride solution through a syringe. Ca 2+ Cross-linked and fixed with sodium alginate to form water-insoluble calcium alginate-sodium polyacrylate microspheres. The prepared microspheres are regular spherical in shape and have a particle diameter of about 100 μm. The microsphere can effectively adsorb and fix the heavy metal element cadmium in the soil, and the adsorption amount of the heavy metal cadmium in the soil reaches 8.7 mg / g. The soil heavy metal cadmium adsorption microsphere can be widely used in remediation of cadmium heavy metal polluted soil.

Description

Technical field [0001] The invention relates to a soil heavy metal cadmium adsorption microsphere, which belongs to the technical field of pollution ecological restoration. Background technique [0002] Soil heavy metal pollution has become an environmental and social issue of general concern at home and abroad. Soil heavy metal pollution has the following characteristics: (1) Concealment, that is, soil heavy metal pollution does not show harm to the environment within a certain period of time. When its content exceeds the soil capacity or soil environmental conditions change, heavy metals will suddenly activate, causing Serious ecological hazards are called "chemical time bombs". (2) Irreversibility, heavy metals entering the soil cannot be degraded by microorganisms and are easy to accumulate. (3) Concomitant and comprehensive. In the ecological environment, multiple heavy metal pollution often occurs at the same time, resulting in consistent pollution. In addition, heavy me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30B09C1/00
Inventor 周根娣张杭君董鸣李文兵贾秀英
Owner HANGZHOU NORMAL UNIVERSITY
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