Modified polymer fiber balls, preparation method thereof and remediation method of Cd (II) contaminated soil

Abstract

The invention relates to the technical field of contaminated soil remediation, and provides a preparation method of modified polymer fiber balls, which comprises the following steps of: mixing polymer fibers with a grafting solution, and carrying out grafting modification to obtain modified polymer fibers; and cutting the modified polymer fibers to obtain modified polymer fiber balls. The grafting solution comprises the following components in percentage by mass: 55-65% of water, 10-20% of ethanol, 20-30% of acrylic acid, 0.1-0.5% of benzophenone, 1-3% of ammonium ferrous sulfate and 0.1-1% of concentrated sulfuric acid. When the prepared modified polymer fiber balls are used for repairing Cd (II) contaminated soil, weak acid extraction state cadmium in the soil can be selectively and effectively removed, the soil structure cannot be damaged, and the modified polymer fiber balls are efficient and safe. The prepared modified polymer fiber balls can be recycled, and are economical and feasible.

Description

technical field [0001] The invention relates to the technical field of remediation of contaminated soil, in particular to a composite material for remediating Cd(II) polluted soil, a preparation method thereof and a method for remediating Cd(II) polluted soil. Background technique [0002] According to reports, the land area polluted by heavy metals in China has reached 26 million hectares. Among these heavy metal pollutants, cadmium pollution is the most serious, and the cadmium content in cultivated land is still increasing at a rate of 0.004mg / kg per year. The problem of cadmium pollution in farmland has become particularly prominent and severe. Studies have shown that weakly acid-extracted cadmium is the main factor that cadmium-contaminated soil endangers human health or ecological security. Soil cadmium pollution is harmful and polluted widely because of the good water solubility of cadmium ions. Weak acid-extracted cadmium can migrate with the movement of water molec...

AI Technical Summary

Problems solved by technology

The leaching method works quickly and repairs thoroughly, but it will destroy the soil structure and cause the loss of soil nutrients. Generally, the repaired soil cannot be directly used for agricultural production; the energy consumption of electrochemical repair is large, the repair area is limited, and the soil properties will also change. changes, and the restoration effect will gradually weaken over time; the bioremediation method is simple to operate, green and environmentally friendly, and has no secondary pollution.

Therefore, except for plant extraction, which has been tested in a certain area of ​​farmland, the extraction method has not yet been applied on a large scale.