Preparation and application of a heavy metal cadmium contaminated soil remediation material
A technology for cadmium-contaminated soil and remediation materials, applied in the restoration of contaminated soil, soil conditioning materials, applications, etc., can solve the problems of affecting soil fertility, easy aggregation, and reduced in-situ repair effect of nano-ferrous phosphate. Achieve the effects of recycling, firm adsorption, and significant social and economic benefits
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[0034] A preparation method for heavy metal cadmium contaminated soil remediation material, comprising the following steps:
[0035] 1) dissolving the cellulose ether in water, removing oxygen to obtain a cellulose ether solution;
[0036] 2) Add biochar particles in anaerobic state and stir evenly;
[0037] 3) Add ferrous salt solution under anaerobic state, and stir evenly;
[0038] 4) Add sodium phosphate solution dropwise while stirring in anaerobic state, and stir thoroughly after the dropwise addition to obtain a cellulose ether-stabilized loaded nano-ferrous phosphate suspension, which is a heavy metal cadmium-contaminated soil remediation material.
[0039] Preferably, a kind of preparation method of heavy metal cadmium contaminated soil remediation material comprises the following steps:
[0040] 1) dissolving carboxymethyl cellulose in water, and performing deoxygenation treatment to obtain a cellulose ether solution;
[0041] 2) Add biochar particles in anaerobic...
Embodiment 1
[0064] Preparation of biochar:
[0065] 1) Drying: Cut the collected Chinese medicine dregs into pieces and dry them at 105°C.
[0066] 2) Pyrolysis: Put the weighed traditional Chinese medicine dregs into a crucible and place them in a muffle furnace. Under nitrogen, heat up to 600°C at a heating rate of 20°C / min, carbonize at a constant temperature for 2 hours, and then cool to room temperature , take it out, grind it, pass through a 24-120 mesh sieve, and keep it sealed. figure 1 SEM image of the prepared biochar.
[0067] Depend on figure 1 It can be seen that biochar has a rich pore structure.
Embodiment 2
[0069] Preparation of Nano Ferrous Phosphate Suspension:
[0070] 1) Dissolve 0.1307g of ferrous sulfate heptahydrate in 25mL of deoxygenated water to prepare ferrous sulfate solution;
[0071] 2) Dissolve 0.1178g of sodium phosphate dodecahydrate in 25mL of deoxygenated water to obtain a sodium phosphate solution;
[0072] 3) Under anaerobic conditions, add the sodium phosphate solution dropwise to the ferrous sulfate solution while stirring to obtain a nano-ferrous phosphate suspension.
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