Adsorption plate for cadmium in soil and application of adsorption plate

Abstract

The invention provides an adsorption plate for cadmium in soil, and a preparation method and application of the adsorption plate. Sodium alginate-corncob mixing gel solutions with different concentrations are configured by using sodium alginate and modified corncob, and are respectively added into an inner-layer circular inner cavity, an intermediate-layer annular inner cavity and an outer-layer annular inner cavity in an annular cylindrical mold according to the descending sequence of the concentration of the corncob; a plurality of pillars parallel to a center shaft are uniformly arranged in the direction, perpendicular to the bottom plane of the mold, of the inner surfaces of the bottom surfaces of the three inner cavities or the inner surface of a top cover of the mold; after the mold is filled, the top cover of the mold covers the mold, and the mold is cooled and sized, and then is released to obtain a sodium alginate-corncob annular porous adsorption plate. The invention further provides the application of the adsorption plate prepared by using the method to adsorption of cadmium in soil. The method is quickly effective, easy and convenient to operate, low in treatment cost and free from secondary pollution; the adsorption plate has an obvious adsorption fixing effect on cadmium of different concentration in soil; a novel technical method is provided for remediation of the soil polluted by cadmium.

Description

technical field [0001] The invention relates to a soil heavy metal cadmium adsorption plate and an application thereof, and specifically belongs to the technical field of pollution ecological restoration. Background technique [0002] The heavy metal cadmium is one of the most toxic heavy metal elements, and has good water solubility, which is easy to cause serious pollution to the water body and soil environment. Cadmium can enter the human body through air, water and food, and accumulate in the human body. The heavy metal cadmium mainly accumulates in the kidneys, which seriously damages the function of the urinary system; cadmium can also replace the calcium in the bone, making the bone loose and joint pain. One of the "eight major public hazards" events that occurred in Japan in the last century, the culprit of the bone pain disease is the heavy metal cadmium. [0003] As an important part of environmental elements, soil carries about 90% of pollutants in the environme...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the deficiencies of the prior art, and propose a soil heavy metal cadmium adsorption plate and its method for soil heavy metal cadmium resistance control. And it is easy to cause secondary pollution. It has the characteristics of high efficiency and environmental protection, low repair cost, long-lasting treatment effect, and can be applied to the repair of different types of cadmium-contaminated soil.

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