Saline-alkali soil lead and cadmium heavy metal ion remover and preparation method thereof

Abstract

The invention discloses a saline-alkali soil lead and cadmium heavy metal ion remover and a preparation method thereof. The remover comprises the following raw material components in parts by weight:25 to 35 parts of mineral source humus ultrafine powder; 20 to 35 parts of mesoporous silica; 25-30 parts of shale, 10-15 parts of citric acid, and 4-8 parts of cyanobacteria liquid; the citric acid in the soil desalting agent can improve the alkaline environment of soil; the mesoporous silica is matched with mineral source humus ultrafine powder, so various heavy metal ions can be strongly adsorbed in a short time, and the landform of saline-alkali soil is improved; the cyanobacteria can effectively treat the heavy metal ions in the soil for a long time, and the heavy metal ions in the soil are continuously and efficiently removed through the matching effect of the mesoporous silica and the cyanobacteria.

Description

technical field [0001] The invention relates to the technical field of saline-alkali soil improvement, in particular to a saline-alkali soil lead and cadmium heavy metal ion remover and a preparation method thereof. Background technique [0002] Coastal saline-alkali land is mainly formed due to the impact of seawater, soil transpiration, land reclamation projects, deforestation, and salt production from surrounding lakes. Its characteristics are mainly reflected in factors such as high soil salinity, high groundwater level, and low natural desalination rate of soil. Freshwater resources are scarce, hydrology has diurnal and seasonal changes, vegetation species diversity and quantity are poor, native tree species and saline-alkali-resistant tree species grow slowly, and cannot quickly form forests. In terms of climate, the ecological environment is easily affected by typhoons, sea tides, salt dust, and salt spray. [0003] For heavy metal-contaminated soil, the commonly us...

AI Technical Summary

Problems solved by technology

Alkaline substances (such as limestone, fly ash) can passivate the heavy metal pollutants in the soil to a certain extent in the short term by increasing the soil pH and transforming heavy metals into hydroxides or carbonates. The effect is unstable, and when the soil environment changes (such as acid rain, high temperature, fertilization), the passivated heavy metals are easily released into the soil again

Adsorption and exchange materials (zeolite, sepiolite) have small particles, large specific surface, strong adsorption capacity and ion exchange capacity, and fix heavy metal ions on the surface by adsorption or ion exchange, thereby reducing the mobility of heavy metals; heavy metals Reactive substances (soluble phosphate, NaS) react with heavy metal ions to form slightly soluble or insoluble compounds by introducing groups that can react with heavy metal ions, thereby reducing the mobility of metals. However, most of the currently used carriers are harmful to soil. Larger disturbances can easily cause problems such as soil compaction and grain production reduction

[0004] The application number CN201610270070.8 discloses a soil passivation restoration agent with nano-silica as the carrier and its preparation method. The silica is the same as the original composition of the soil, has high surface activity, and is easy to graft reactive functional groups. Using silica as a carrier, nanomaterials can strengthen a variety of interface reactions due to their large specific surface area and microinterface characteristics, which can reduce the disturbance of passivators to soil, but nanoparticles have high chemical reactivity. Nanoparticles lost in the process of preparation, application and storage enter the human body, destroy the protein, cell membrane and DNA in the human body, and pose a serious threat to human health; and the soil restoration agent is used for the removal of heavy metal ions in saline-alkali soil because The saline-alkali compaction of the soil is relatively serious, and the effect of removing heavy metal ions is greatly reduced

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