Preparation method and product of high-efficiency leaching and adsorbing material for Cd contaminated soil and wastes

Abstract

The invention provides a preparation method of a high-efficiency leaching and adsorbing material for Cd contaminated soil and wastes and also discloses the high-efficiency leaching and adsorbing material prepared by the preparation method. The material has quicker and higher adsorption capacity for heavy metal Cd; besides, the material is low in price and easily-obtained and facilitates wide application of a leaching remediation method for heavy metal contaminated soil; meanwhile, sulfydryl (-HS) in sulfhydryl modified attapulgite clay serving as an adsorbing material can generate a stronger complexing action with heavy metal ions, and heavy metal is not easy to dissolute, so that the sulfhydryl modified attapulgite clay has important significance on repeated leaching and adsorbing; in addition, a pH value, obtained by measuring, of the sulfhydryl modified attapulgite clay is neutral and is relatively-stable, so the sulfhydryl modified attapulgite clay has no influence on leacheate or soil and better facilitates quick and efficient leaching.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a preparation method and product of an efficient leaching adsorption material for Cd-contaminated soil and waste. Background technique [0002] With the development of economy and the increase of population, environmental pollution has become a major problem that threatens the ecological balance and human health, especially the pollution of heavy metal Cd. At present, there are many remediation methods for soil heavy metal pollutants, generally including physical remediation, chemical remediation and biological remediation, but most remediation methods cannot achieve ideal results. [0003] Although the soil heavy metal chemical remediation method can achieve the purpose of temporary remediation, it cannot remove the heavy metals in the soil, and the chemical materials used are likely to cause soil compaction and other changes in physical and chemica...

AI Technical Summary

Problems solved by technology

At present, there are many remediation methods for soil heavy metal pollutants, generally including physical remediation, chemical remediation and biological remediation, but most remediation methods cannot achieve ideal results

[0003] Although the soil heavy metal chemical remediation method can achieve the purpose of temporary remediation, it cannot remove the heavy metals in the soil, and the chemical materials used are likely to cause soil compaction and other changes in physical and chemical properties; while the soil heavy metal bioremediation method is mainly for planting high enrichment Plants, this method has a long repair period and cannot achieve the purpose of rapid restoration, thus affecting the use of land; soil heavy metal physical restoration methods include leaching, guest soil, soil replacement and other methods. From the perspective of economy and efficiency, the leaching method For a more ideal repair method

However, the commonly used soil leaching adsorption materials have disadvantages such as high price, low adsorption capacity, and single adsorption of heavy metals, resulting in low soil leaching efficiency and high leaching repair costs.

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