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Microspheres for adsorbing heavy-metal cadmium in soil

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: 2014-12-24
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 microspheres for adsorbing heavy-metal cadmium in soil. The microspheres are prepared by the following steps: firstly dissolving powder of sodium alginate and sodium polyacrylate in deionized water, dropwise adding the mixed solution of the sodium alginate and the sodium polyacrylate into a calcium chloride solution by using an injector, and forming water-insoluble microspheres with the sodium alginate and the sodium polyacrylate by cross-linking fixation of Ca<2+> and the sodium alginate. The microspheres prepared are regularly-spherical and are about 100mu m in particle size. The microspheres disclosed by the invention have the advantages that the heavy-metal element (cadmium) in the soil can be effectively adsorbed and fixed, and the adsorbing amount for the heavy-metal cadmium in the soil is 8.7mg / g. The microspheres can be widely applied in restoration of the soil polluted by the heavy-metal cadmium.

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 Applications(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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