Composite material for heavy metal-organic matter repair and preparation method and application of composite material
A composite material and organic matter technology, applied in the field of soil remediation, can solve the problems of reducing specific surface area and remediation ability, affecting soil microbial activity, and short passivation cycle, so as to avoid rapid oxidation, repeatedly passivate heavy metals, and reduce biological toxicity. Effect
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[0022] A method for preparing a composite material for heavy metal-organic repair provided by an embodiment of the present invention comprises the following steps:
[0023] S1, preparation of intermediate materials
[0024] The intermediate material is formed by loading the functional material on the loading medium; wherein, the functional material includes elemental sulfur-modified zero-valent iron material. The inventors found that the zero-valent iron material repaired by elemental sulfur can significantly activate the biological effect of microorganisms and improve the repair effect. Preferably, the functional material includes elemental sulfur and elemental silicon modified zero-valent iron materials, and the use of elemental sulfur and elemental silicon for repair is beneficial to further prevent rapid oxidation of zero-valent iron and can increase the passivation effect on heavy metals.
[0025] Preferably, the supporting medium is biochar (BC). The use of BC@FeSSi fu...
Embodiment 1
[0045] The present embodiment provides a kind of preparation method for the composite material of heavy metal-organic matter restoration, and it comprises the following steps:
[0046] First, 2.3g g biochar and 4.90g FeCl 3 Add it into a Erlenmeyer flask filled with 150 mL of deionized water and shake it evenly for 10 h, transfer it to a 2 L round-bottomed three-necked flask, and blow nitrogen into it for 30 min to completely exclude oxygen to obtain the first mixture.
[0047] Secondly, weigh 7.6g of NaBH 4 , 1.5g Na 2 S 2 o 4 and 0.2 mL of silica gel (wt=30%) were mixed with 250 mL of deionized water under nitrogen protection and magnetic stirring to obtain the second mixture. The second mixture was added dropwise to the first mixture at a rate of 4mL / min. After the dropwise addition, the reaction was continued for 20 minutes, and the black particulate matter obtained by vacuum filtration was BC@FeSSi, which was immediately transferred to a vacuum drying oven , dried at...
Embodiment 2
[0050] The present embodiment provides a kind of preparation method for the composite material of heavy metal-organic matter restoration, and it comprises the following steps:
[0051] First, 2.3 g g biochar and 4.90 g FeCl 3 Add it into a Erlenmeyer flask filled with 150 mL of deionized water and shake it evenly for 14 hours, then transfer it to a 2 L round-bottomed three-neck flask, and blow nitrogen into it for 30 minutes to completely exclude oxygen to obtain the first mixture.
[0052] Secondly, weigh 7.6g of NaBH 4 , 1.5g Na 2 S 2 o 4 and 0.2 mL of silica gel (wt=30%) were mixed with 250 mL of deionized water under nitrogen protection and magnetic stirring to obtain the second mixture. The second mixture was added dropwise to the first mixture at a rate of 6 mL / min. After the dropwise addition, the reaction was continued for 40 minutes. The black particulate matter obtained by vacuum filtration was BC@FeSSi, which was immediately transferred to a vacuum drying oven ...
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