Novel material for repairing heavy metal Cr-Pb-Cd contaminated soil as well as preparation method and using method of novel material

Abstract

The invention discloses a novel material S-CrPbCd for repairing heavy metal Cr-Pb-Cd contaminated soil as well as a preparation method and a using method of the novel material S-CrPbCd. The material comprises 5-15 percent of modified carbon nano tube, 10-60 percent of modified clay mineral and 20-60 percent of quicklime. The S-CrPbCd can efficiently adsorb Pb, Cd and Cr in the soil, and does not obviously change the soil property and cultivability. The S-CrPbCd enables the residue amount of Pb, Cd and Cr in sensitive crops to be reduced to 75-90 percent within 1-2 months, and meanwhile, the material has the characteristics of low cost, simple preparation process, no secondary pollution, quick action and easiness in large-area popularization.

Description

technical field [0001] The invention belongs to the field of environmental treatment and relates to the treatment of heavy metal pollution, in particular to a new material for repairing heavy metal Cr-Pb-Cd polluted soil and its preparation method and use method. Background technique [0002] Over the years, the discharge of three industrial wastes, municipal solid waste, sludge, and the unreasonable use of heavy metal-containing pesticides and fertilizers have polluted the soil. Among them, heavy metal pollution has become one of the most serious environmental problems. In environmental pollution research, heavy metals mostly refer to chemical elements with significant biological toxicity such as Hg, Cd, Pb, Cr, and metalloid As. Soil heavy metal pollution can affect the yield and quality of crops, and can endanger human health through the food chain. [0003] Elemental chromium (Cr) is a stable metal widely used in making stainless steel, auto parts, tools, tapes and vide...

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Problems solved by technology

[0011] Most of the existing restoration materials used for the treatment of heavy metal-contaminated soil have the following defects: (1) The restoration materials themselves contain a variety of heavy metals with sufficient concentration to cause pollution, which is easy to cause secondary pollution; (2) The raw materials of restoration agents such as cement and other materials It will cause soil compaction and affect the planting function of the soil; (3) the restoration agent needs to use metal chelating agents which are organic pollutants, and the heavy metals will be released again after the chelating agent is degraded; (4) the raw materials of restoration agents are various, The preparation process is complicated and the cost is high

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