Adsorption plate used for soil heavy metal cadmium adsorption and preparation method and application thereof

Abstract

The invention provides an adsorption plate used for soil heavy metal cadmium adsorption and a preparation method thereof; rice straw and / or rice husk are / is modified by phosphoric acid, and then mixed with sodium alginate to prepare a homogenate, the homogenate is added into a hollow cylindrical mold with an inner cavity, the cylindrical mold comprises a bottom surface and a side face tube which is in sealed connection with the edge of the bottom surface, a plurality of mutually parallel pillars are uniformly arranged on the bottom inner surface of the inner cavity of the mold in the direction of being perpendicular to the base plane of the mold, and the mold filled with the homogenate is frozen for shaping at the temperature of-20 DEG C, and then is demoulded to prepare a sodium alginate-rice straw and rice husk particle porous adsorption plate. The invention also provides application of the porous adsorption plate prepared by the method in adsorption and fixing of heavy metal cadmium in soil. The method has the advantages of simple operation and low cost, does not cause secondary pollution, and can be widely applied to repair of heavy metal cadmium polluted soil.

Description

technical field [0001] The invention relates to an adsorption plate used for adsorption of heavy metal cadmium in soil, a preparation method and application thereof, and belongs to the technical field of pollution ecological restoration. Background technique [0002] With the rapid development of society and economy, human beings are increasingly exploiting the resources in the environment, and the accompanying environmental pollution problems are also becoming more and more serious. Among them, soil heavy metal pollution is an important aspect of environmental pollution. At present, the cultivated land area polluted by heavy metals in my country accounts for about one-fifth of the total cultivated land area. Soil heavy metal pollution has the characteristics of concealment, long-term and irreversibility. It can enter the body through the food chain soil-plant-(animal)-human, causing serious harm to human health and life. Therefore, the treatment of heavy metal pollution i...

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Problems solved by technology

A large number of rice husks are not easy to be decomposed by bacteria because of their hard surface and high silicon content, and they are discarded to cause environmental pollution; rice straw can be prepared by oxygen-limited cracking method to improve soil fertility and increase soil carbon sink. The utilization range of straw and rice husk is relatively narrow. In recent years, the use of agricultural waste to remediate and remediate heavy metals in soil has been widely studied, but there are few studies on the use of rice straw and rice husk as adsorbents.

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