Complexing agent microcapsule for plant soil restoration and preparation method thereof

Abstract

The invention discloses a complexing agent microcapsule for plant soil restoration and a preparation method thereof. A core material of the microcapsule is a complexing agent; and a wall material of tThe invention discloses a complexing agent microcapsule for plant soil restoration and a preparation method thereof. A core material of the microcapsule is a complexing agent; and a wall material of the microcapsule is a biodegradable polymer capable of avoiding the secondary pollution caused by a non-degradable enveloping wall material when the microcapsule is applied to a root zone of a plant. The microcapsule is a biodegradable polymer capable of avoiding the secondary pollution caused by a non-degradable enveloping wall material when the microcapsule is applied to a root zone of a plant. The complexing agent microcapsule can increase the quantity of heavy metal accumulated by the plant, control the release of the complexing agent, and has an excellent slow release effect, thereby contrhe complexing agent microcapsule can increase the quantity of heavy metal accumulated by the plant, control the release of the complexing agent, and has an excellent slow release effect, thereby controlling the rapid solubilization of the heavy metal, reducing the toxicity of the heavy metal and the complexing agent on the plant, and simultaneously reducing the environmental risk caused by the appolling the rapid solubilization of the heavy metal, reducing the toxicity of the heavy metal and the complexing agent on the plant, and simultaneously reducing the environmental risk caused by the application of the complexing agent. The preparation method adopts a solution evaporation method, not only has simple operation and low cost of a reagent, but also controls the grain size of the microcaplication of the complexing agent. The preparation method adopts a solution evaporation method, not only has simple operation and low cost of a reagent, but also controls the grain size of the microcapsule within a nanometer range without increasing the temperature and using a flocculant bringing about phase separation. The method adopts micronization to process the core material in the preparationsule within a nanometer range without increasing the temperature and using a flocculant bringing about phase separation. The method adopts micronization to process the core material in the preparation process so as to reduce the sudden release of the complexing agent and simultaneously reduce the grain size of the microcapsule.process so as to reduce the sudden release of the complexing agent and simultaneously reduce the grain size of the microcapsule.

Description

technical field [0001] The invention belongs to the technical field of phytochelation-induced restoration of polluted soil, and in particular relates to a complexing agent microcapsule for phytoremediation of soil and a preparation method thereof. Background technique [0002] With the rapid development of industry and agriculture, the problem of environmental pollution is becoming more and more serious, and heavy metals are one of the main environmental pollutants. It has been reported that 1,400,000 sites of soil are polluted with heavy metals or organic matter in Western Europe alone. According to the national survey of sewage irrigation areas conducted by the Ministry of Agriculture of my country, among the 1.4 million hectares of sewage irrigation areas, the area of ​​land polluted by heavy metals accounts for 64.8% of the area of ​​sewage irrigation areas, of which 46.7% are lightly polluted and 9.7% are moderately polluted. , serious pollution accounted for 8.4%. [...

AI Technical Summary

Problems solved by technology

Recently, Shibata{M.Shibata, T.Konno, R.Akaike, Y.Xu, R.Shen and J.Ma, Phytoremediation of Pb contaminated soil with polymer-coated EDTA, Plant and Soil 290(2007), pp.201- 208} and others developed five kinds of olefin polymer coatings, and granulated EDTA with a granulator. This kind of coated EDTA has a good effect on the extraction of Pb from corn, but the coating material is a biodegradable material, which is easy to form secondary secondary pollution

However, microcapsules, as an important excellent slow-release control system, have not been used to encapsulate complexing agents for phytoremediation of heavy metal-contaminated soils.

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