A kind of foam carbon immobilization passivator and its preparation method and application

Abstract

The invention discloses a foam carbon holding passivator, which is prepared from the following raw materials in parts by weight: 100 parts of resin, 1-10 parts of curing agent, 1-10 parts of foaming agent, 1-10 parts of surfactant, 1-15 parts of salt modifier; the above raw materials are prepared, mixed, autoclaved and foamed, and carbonized to finally obtain a foam carbon holding passivator; the specific surface area of ​​the obtained foam carbon holding passivator is 300~500m 2 / g, the micropore diameter is 1.9~2.5nm, and the cell diameter is 200~500μm; the preparation process of this material is simple, the cost is low, and the performance is stable; through comparison with wood activated carbon, coal activated carbon, walnut shell biochar and ordinary foam carbon It can be found that the foam carbon immobilization passivator of the present invention can convert lead and cadmium in the soil into a residue state and effectively reduce the precipitation of lead and cadmium.

Description

technical field

[0001] The invention relates to a foamed carbon material with high-efficiency fixation / stabilization effects on soil heavy metals lead and cadmium, and specifically belongs to the technical application field of foamed carbon materials. Background technique

[0002] After heavy metals such as lead and cadmium enter the soil, under the action of bioaccumulation and amplification effects, soluble lead and cadmium will eventually enter the human body and cause serious harm to people's health. Lead and cadmium entering the soil exist in various forms, such as exchangeable state, acid extractable state, oxidizable state, reducible state, residue state, etc. Among them, except for the residue state, other forms of lead and cadmium exist in specific environments. It may enter the biosphere and cause environmental pollution. Therefore, it is an important measure to effectively reduce lead and cadmium heavy metal pollution by immobilizing and passivating lead and cadmi...

Examples

Embodiment 1

[0031] Embodiment 1: this foamed charcoal holding deactivator comprises the raw material of following weight portion: 40 parts of thermosetting phenolic resins, 60 parts of walnut shell-phenol liquefaction product resins, H 3 PO 4 10 parts, 3 parts of n-hexane, 7 parts of surfactant AEO-9, salt modifier KH 2 PO 4 8 parts, wherein the weight average molecular weight of the thermosetting phenolic resin is 15000, the viscosity is 1000mPa s, and the solid content is 54%, and the weight average molecular weight of the walnut shell-phenol liquefaction product resin is 428000, the viscosity is 280mPa s, and the solid content is 41.5%;

[0032] The preparation method of above-mentioned foamed carbon holding passivator is as follows:

[0033] (1) The weighed thermosetting phenolic resin, walnut shell-phenol liquefaction product resin, n-hexane, surfactant AEO-9, KH 2 PO 4 Add to the beaker in turn, stir and mix at 1100r / min for 2min with the help of a high-speed mixer, then add H ...

Embodiment 2

[0036] Embodiment 2: This foamed charcoal holding passivator comprises the following raw materials in parts by weight: 40 parts of urea-formaldehyde resin, 40 parts of sunflower stalk-phenol liquefaction product resin, 20 parts of ingot maple seed shell-phenol liquefaction product resin, 9 parts of oxalic acid, normal 3 parts of heptane, 8 parts of surfactant SPAN-40, salt modifier ZnCl 2 8 parts, wherein the weight average molecular weight of the urea-formaldehyde resin is 8154, the viscosity is 1100mPa·s, and the solid content is 54%, the weight average molecular weight of the sunflower straw-phenol liquefaction product resin is 249000, the viscosity is 400mPa·s, and the solid content is 45.7%; The weight average molecular weight of the phenol liquefaction product resin is 210000, the viscosity is 562mPa·s, and the solid content is 46.2%;

[0037] The preparation method of above-mentioned foamed carbon holding passivator is as follows:

[0038] (1) Put the weighed urea-form...

Embodiment 3

[0041] Embodiment 3: This foamed carbon holding passivator includes the following raw materials in parts by weight: 30 parts of phenol-formaldehyde-urea co-condensation resin, 70 parts of walnut shell-phenol liquefaction product resin, 10 parts of HCl, 3 parts of acetone, surfactant Tween 40 8 parts, salt modifier Na 2 C 2 o 4 8 parts, wherein the weight-average molecular weight of phenol-formaldehyde-urea polycondensation resin is 15000, the viscosity is 1558mPa·s, and the solid content is 57.9%, and the weight-average molecular weight of walnut shell-phenol liquefaction product resin is 330000, 466mPa·s, and the solid content is 50.3%;

[0042] The preparation method of above-mentioned foamed carbon holding passivator is as follows:

[0043] (1) The weighed phenol-formaldehyde-urea co-condensation resin, walnut shell-phenol liquefaction product resin, acetone, Tween 40, Na 2 C 2 o 4 Add it to a small beaker in turn, mix it at 1200r / min for 2.5 minutes with the help of a...

technical field

[0001] The invention relates to a foamed carbon material with high-efficiency fixation / stabilization effects on soil heavy metals lead and cadmium, and specifically belongs to the technical application field of foamed carbon materials. Background technique

[0002] After heavy metals such as lead and cadmium enter the soil, under the action of bioaccumulation and amplification effects, soluble lead and cadmium will eventually enter the human body and cause serious harm to people's health. Lead and cadmium entering the soil exist in various forms, such as exchangeable state, acid extractable state, oxidizable state, reducible state, residue state, etc. Among them, except for the residue state, other forms of lead and cadmium exist in specific environments. It may enter the biosphere and cause environmental pollution. Therefore, it is an important measure to effectively reduce lead and cadmium heavy metal pollution by immobilizing and passivating lead and cadmi...

Examples

Embodiment 1

[0031] Embodiment 1: this foamed charcoal holding deactivator comprises the raw material of following weight portion: 40 parts of thermosetting phenolic resins, 60 parts of walnut shell-phenol liquefaction product resins, H 3 PO 4 10 parts, 3 parts of n-hexane, 7 parts of surfactant AEO-9, salt modifier KH 2 PO 4 8 parts, wherein the weight average molecular weight of the thermosetting phenolic resin is 15000, the viscosity is 1000mPa s, and the solid content is 54%, and the weight average molecular weight of the walnut shell-phenol liquefaction product resin is 428000, the viscosity is 280mPa s, and the solid content is 41.5%;

[0032] The preparation method of above-mentioned foamed carbon holding passivator is as follows:

[0033] (1) The weighed thermosetting phenolic resin, walnut shell-phenol liquefaction product resin, n-hexane, surfactant AEO-9, KH 2 PO 4 Add to the beaker in turn, stir and mix at 1100r / min for 2min with the help of a high-speed mixer, then add H ...

Embodiment 2

[0036] Embodiment 2: This foamed charcoal holding passivator comprises the following raw materials in parts by weight: 40 parts of urea-formaldehyde resin, 40 parts of sunflower stalk-phenol liquefaction product resin, 20 parts of ingot maple seed shell-phenol liquefaction product resin, 9 parts of oxalic acid, normal 3 parts of heptane, 8 parts of surfactant SPAN-40, salt modifier ZnCl 2 8 parts, wherein the weight average molecular weight of the urea-formaldehyde resin is 8154, the viscosity is 1100mPa·s, and the solid content is 54%, the weight average molecular weight of the sunflower straw-phenol liquefaction product resin is 249000, the viscosity is 400mPa·s, and the solid content is 45.7%; The weight average molecular weight of the phenol liquefaction product resin is 210000, the viscosity is 562mPa·s, and the solid content is 46.2%;

[0037] The preparation method of above-mentioned foamed carbon holding passivator is as follows:

[0038] (1) Put the weighed urea-form...

Embodiment 3

[0041] Embodiment 3: This foamed carbon holding passivator includes the following raw materials in parts by weight: 30 parts of phenol-formaldehyde-urea co-condensation resin, 70 parts of walnut shell-phenol liquefaction product resin, 10 parts of HCl, 3 parts of acetone, surfactant Tween 40 8 parts, salt modifier Na 2 C 2 o 4 8 parts, wherein the weight-average molecular weight of phenol-formaldehyde-urea polycondensation resin is 15000, the viscosity is 1558mPa·s, and the solid content is 57.9%, and the weight-average molecular weight of walnut shell-phenol liquefaction product resin is 330000, 466mPa·s, and the solid content is 50.3%;

[0042] The preparation method of above-mentioned foamed carbon holding passivator is as follows:

[0043] (1) The weighed phenol-formaldehyde-urea co-condensation resin, walnut shell-phenol liquefaction product resin, acetone, Tween 40, Na 2 C 2 o 4 Add it to a small beaker in turn, mix it at 1200r / min for 2.5 minutes with the help of a...

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