CN110205132A - A kind of preparation method and application of PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material - Google Patents
A kind of preparation method and application of PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material Download PDFInfo
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- CN110205132A CN110205132A CN201910450862.7A CN201910450862A CN110205132A CN 110205132 A CN110205132 A CN 110205132A CN 201910450862 A CN201910450862 A CN 201910450862A CN 110205132 A CN110205132 A CN 110205132A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/08—Aluminium compounds, e.g. aluminium hydroxide
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Abstract
The present invention provides a kind of preparation methods of PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material, the method is as follows: (1) weighs vermiculite and montmorillonite, be added and KMnO is housed4In the conical flask of solution；(2) MnSO is added into bottle4Solution when atropurpureus pulverulent solids to be generated, is placed in gelation on shaking table；(3) obtained gelatinized mixture is aged at room temperature；It after ageing, is impregnated repeatedly using ethanol solution and distilled water, until soak pH value is in neutrality；(4) vermiculite-montmorillonite mixture is dried, obtains MnO2PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material.The present invention also provides a kind of applications of above-mentioned PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material.Present invention preparation is simple and convenient to operate, and the composite material being prepared is applied in the reparation of spoil Subsided Reclamation Region cadmium pollution soil, soil pH value can not only be improved, effectively removes the cadmium metal in soil, realizes the reparation to soil, moreover it is possible to promote the increasing both production and income of plant.
Description
Technical field
The present invention relates to technical field of soil remediation more particularly to a kind of preparations of PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material
Method and its application in the reparation of spoil Subsided Reclamation Region cadmium pollution soil.
Background technique
Accessory products of the spoil as coal resources, contain a large amount of harmful substances, wherein heavy metal cadmium is allusion quotation in spoil
One of environmental contaminants of type.Since the migration of cadmium in the environment is poor, the residence time is long, degradation difficulty is big, to environment and
Organism causes great damage.In this regard, soil in-situ passivation recovery technique is low in cost with its, easy to operate, reparation effect
Fruit is good, is suitble to the features such as large-area applications and is increasingly becoming the important means for administering soil heavy metal cadmium.
Currently, common Cd passivator has alkaline matter, phosphate, clay mineral, biological carbon and organic fertilizer etc..Its
In, clay mineral is a kind of rich reserves, environmentally protective natural material, has good absorption property.Studies have shown that vermiculite
There is preferable passivation effect to soil heavy metal cadmium with montmorillonite.
MnO2It is a kind of important manganese series oxides, there is high oxidation effect, biggish specific surface area and immobilization position
Point can reduce the leaching, migration and conversion of heavy metal, can also improve the physicochemical property of soil.In recent years, many researchs are straight
It connects and utilizes MnO2Or by MnO2It is supported on other materials surface, to increase its specific surface area and generate more polyhydroxy, or is generated more
The mode of more exchangeable ions, in this, as adsorbent, to adsorb heavy metal ion and pollutant.However, so far, about
Utilize MnO2Modified vermiculite-montmorillonite composite material is seldom come the specific research for carrying out cadmium pollution soil reparation.
Accordingly, it is badly in need of at present a kind of using MnO2It modified PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material preparation method and answers
With.
Summary of the invention
It is a kind of using MnO technical problem to be solved by the present invention lies in providing2Modified PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite Composite
The preparation method and application of material.
The present invention solves above-mentioned technical problem using following technical scheme:
A kind of preparation method of PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material, comprises the following specific steps that:
(1) vermiculite and the montmorillonite for weighing 18-22g respectively, are added to equipped with 90-110mL, 2.8-3.2mol/LKMnO4
In the conical flask of solution；
(2) the 2.8-3.2mol/L MnSO of 140-160mL is added into conical flask4Solution is purple black to generate in conical flask
When the pulverulent solids of color, conical flask is placed in 22-28 DEG C, gelation 1.8-2.2h on the shaking table of 110-130r/min；
(3) gelation vermiculite-montmorillonite mixture obtained in step (2) is taken out from conical flask, and at room temperature
Ageing；After being aged 22-26h, the vermiculite-montmorillonite mixture is impregnated using ethanol solution and distilled water repeatedly, until impregnating
Liquid pH value is in neutrality；
(4) vermiculite-montmorillonite mixture that step (3) obtains is put into 65-75 DEG C of drying box and is dried to get mesh
MnO needed for mark2PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material.
As one of preferred embodiment of the invention, weighed vermiculite and montmorillonite are specially by removing in the step (1)
100 miscellaneous mesh vermiculites and montmorillonite.
As one of preferred embodiment of the invention, leech is impregnated using ethanol solution and distilled water repeatedly in the step (3)
Stone-montmorillonite mixture method particularly includes: first the vermiculite after ageing-montmorillonite mixture is poured into ethanol solution,
Distilled water is added according still further to the ratio of 1:1, stirs evenly；55-65min is stood after stirring 8-12min, then by soak and impurity
Pour out, continuously add ethanol solution and distilled water, in triplicate more than；Finally, rinsing vermiculite-Meng Tuo again with distilled water
Earth mixtures, until solution ph is in neutrality.
As one of preferred embodiment of the invention, MnO is obtained in the step (4)2PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material
Afterwards, it is sealed in hermetic bag with spare.
A kind of answering in the cadmium pollution soil reparation of spoil Subsided Reclamation Region using above-mentioned PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material
With.
The present invention compared with prior art the advantages of be: the present invention utilize MnO2Vermiculite, montmorillonite are modified to make
PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material is obtained, preparation method is simple and convenient to operate；The composite material is applied to spoil Subsided Reclamation Region
Cadmium pollution soil can not only improve soil pH value in repairing, and effectively remove the cadmium metal in soil, realize the reparation to soil,
The increasing both production and income of plant on soil can also further be promoted.
Detailed description of the invention
Fig. 1 be in embodiment 4 different PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material additive amounts to the influence diagram of soil pH value；
Fig. 2 is that different PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material additive amounts become form cadmium content each in soil in embodiment 4
The influence diagram of change；
Fig. 3 be in embodiment 4 different PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material additive amounts to green vegetables stem and leaf part cadmium content
Influence diagram；
Fig. 4 be in embodiment 4 different PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material additive amounts to green vegetables root system part cadmium content
Influence diagram.
Specific embodiment
It elaborates below to the embodiment of the present invention, the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to following implementation
Example.
Embodiment 1
A kind of preparation method of PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material of the present embodiment, comprises the following specific steps that:
(1) 100 mesh vermiculites and montmorillonite of the 18g by removal of impurities are weighed respectively, are added to equipped with 90mL 2.8mol/L
KMnO4In the conical flask of solution.
(2) the 2.8mol/L MnSO of 140mL is added into conical flask4Solution, to generate the powder of atropurpureus in conical flask
When shape solid, conical flask is placed in 22 DEG C, gelation 1.8h on the shaking table of 110r/min.
(3) gelation vermiculite-montmorillonite mixture obtained in step (2) is taken out from conical flask, and at room temperature
Ageing；After being aged 22h, vermiculite-montmorillonite mixture is poured into ethanol solution, distillation is added according still further to the ratio of 1:1
Water stirs evenly；55min is stood after stirring 8min, then soak and impurity are poured out, continuously add ethanol solution and is steamed
Distilled water, in triplicate more than；Finally, vermiculite-montmorillonite mixture is rinsed again with distilled water, until solution ph is in neutrality.
(4) vermiculite-montmorillonite mixture that step (3) obtains is put into 65 DEG C of drying boxes and is dried to get target
Required MnO2PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material, is sealed in hermetic bag, spare.
Embodiment 2
A kind of preparation method of PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material of the present embodiment, comprises the following specific steps that:
(1) 100 mesh vermiculites and montmorillonite of the 22g by removal of impurities are weighed respectively, are added to equipped with 110mL 3.2mol/L
KMnO4In the conical flask of solution.
(2) the 3.2mol/L MnSO of 160mL is added into conical flask4Solution, to generate the powder of atropurpureus in conical flask
When shape solid, conical flask is placed in 28 DEG C, gelation 2.2h on the shaking table of 130r/min.
(3) gelation vermiculite-montmorillonite mixture obtained in step (2) is taken out from conical flask, and at room temperature
Ageing；After being aged 26h, vermiculite-montmorillonite mixture is poured into ethanol solution, distillation is added according still further to the ratio of 1:1
Water stirs evenly；Stand 65min after stirring 12min, then soak and impurity poured out, continuously add ethanol solution and
Distilled water, in triplicate more than；Finally, vermiculite-montmorillonite mixture is rinsed again with distilled water, in solution ph is in
Property.
(4) vermiculite-montmorillonite mixture that step (3) obtains is put into 75 DEG C of drying boxes and is dried to get target
Required MnO2PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material, is sealed in hermetic bag, spare.
Embodiment 3
A kind of preparation method of PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material of the present embodiment, comprises the following specific steps that:
(1) 100 mesh vermiculites and montmorillonite of the 20g by removal of impurities are weighed respectively, are added to equipped with 100mL 3mol/L
KMnO4In the conical flask of solution.
(2) the 3mol/L MnSO of 150mL is added into conical flask4Solution, to generate the powdered of atropurpureus in conical flask
When solid, conical flask is placed in 25 DEG C, gelation 2h on the shaking table of 120r/min.
(3) gelation vermiculite-montmorillonite mixture obtained in step (2) is taken out from conical flask, and at room temperature
Ageing；After ageing for 24 hours, vermiculite-montmorillonite mixture is poured into ethanol solution, distillation is added according still further to the ratio of 1:1
Water stirs evenly；Stand 60min after stirring 10min, then soak and impurity poured out, continuously add ethanol solution and
Distilled water, in triplicate more than；Finally, vermiculite-montmorillonite mixture is rinsed again with distilled water, in solution ph is in
Property.
(4) vermiculite-montmorillonite mixture that step (3) obtains is put into 70 DEG C of drying boxes and is dried to get target
Required MnO2PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material, is sealed in hermetic bag, spare.
Embodiment 4
PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material is in the cadmium pollution of spoil Subsided Reclamation Region in a kind of above-described embodiment 1-3 of this implementation
Application effect in soil remediation.
To inquire into PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite to the repairing effect of cadmium pollution soil, the present embodiment uses indoor pot experiment
Mode, with Huai Nanxin Zhuan Zi spoil Subsided Reclamation Region cadmium pollution soil plant green vegetables, study different administration amount (2.5gkg-1, 5g
kg-1, 15gkg-1, 25gkg-1, 35gkg-1) PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite to soil pH value, soil Cd species distribution, green
The influence of dish upgrowth situation and each position cadmium content of green vegetables.Specific test is as follows:
One, test material
1, test soil: with multi-point sampling method Huainan City, Anhui Province, diligent spoil Subsided Reclamation Region, the new village (116 ° of 51 ' N, 32 °
38 ' E) surface layer (0~20cm) soil of farmland acquisition nearby；Soil after mixing, is placed sombre ventilation through natural air drying, is taken
Partial mill 100 mesh of sieving, and its part physicochemical property is measured, remainder is sieved 20 mesh as potted plant experiment.The soil
Basic physical and chemical are as follows: pH value 6.87, total phosphorus 0.438gkg-1, total nitrogen 5.284gkg-1, organic matter 33.31gkg-1, it is total
Cd 0.43mg·kg-1。
2, for studying object: being green vegetables (Brassica chinensis L) for studying object, kind is " SUZHOUQING(sic) ", seed purchase
From Shandong Province Linqu County great Hua seedling research institute, germination percentage 85%.
3, for trying passivator: the PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material being prepared in above-described embodiment 1-3.
Two, process is tested
1, pot experiment:
Take 3.0kg to be put into clean flowerpot (50cm × 30cm × 30cm) in the soil after above-mentioned 20 mesh of mistake, and to its
Middle PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material (2.5gkg that Different adding amount is added-1, 5gkg-1, 15gkg-1, 25g
kg-1, 35gkg-1), will not add modifying agent is blank control group CK, and experiment sets 6 groups altogether.Entire experiment carries out indoors, protects
The moisture state of 70% maxmun field capacity is held, while applying urea 0.45g, potassium dihydrogen phosphate 0.45g, potassium sulfate 0.09g
Make base fertilizer, plowed soils mixes well itself and soil, and balance sowed green vegetables after 60 days.
Water consumpation management and fertilizer management are consistent with normally producing, and carry out weeding, watering in due course.During test,
It is poured using tap water, in order to avoid bring new pollution sources into.The above-mentioned each processing group of experiment is arranged 3 repetitions and tests, final result
Take the average value of 3 measurements.
2, sample acquisition and analysis:
Plant sample: when green vegetables 90d maturation harvests, every group of selection healthy plant of the same size 10 plants of measurements plant heights, stem
Leaf and root system part fresh weight.The green vegetables sample distilled water of acquisition, which is cleaned, to be dried, and finish 40min in 105 DEG C of baking ovens, at 80 DEG C
Lower drying to constant weight, and part of stem leaf and root system position are separated, and makes it through 100 mesh nylon mesh through agate mortar grinding.Vegetables
Each position total metals of plant are cleared up using nitric acid-perchloric acid, heavy metal Cd content 7500ICP-MS (inspection in all samples
Survey limit 0.06ppb, Agilent company of the U.S.) measurement.
Pedotheque: after green vegetables harvest, the pedotheque that every group acquires uniformly is air-dried, grinding makes it through 100 mesh Buddhist nuns
Dragon sieve, quartering rear portion subpackage bag are spare.The analysis of heavy metal-polluted soil occurrence patterns is carried out using five step extraction method of Tessier, is pressed
It is exchangeable species, carbonate state, Fe-Mn oxide, organic, residual form that difference, which extracts divided stages,.The measurement of soil pH value is adopted
The electrode method for being 1:2.5 with Tu Shui ratio.
3, data processing:
Data are analyzed using Origin 8.0, significance test of difference (p < 0.05) is carried out using 20.0 software of SPSS,
Different lowercase letter indication differences are significant in this research chart.
Three, results and discussion
1, influence of the PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite to soil pH value:
Soil pH value not only influences effective form of heavy metal in soil cadmium, has an effect on the absorption and utilization of plant.With
The increase of soil pH value, the negative electrical charge of hydrous oxide, organic matter and clay mineral increases in soil, can be to the adsorption capacity of Cd
Enhancing, while reducing the concentration of available state Cd, and soil pH value increases can occurrence patterns to the heavy metal in soil and migration
Conversion has a major impact.Therefore, a kind of important way that soil pH value is also remediating heavy metal cadmium pollution is increased.
Fig. 1 is different PERFORMANCE OF MODIFIED VERMICULITEs-montmorillonite composite material (2.5gkg-1, 5gkg-1, 15gkg-1, 25gkg-1, 35gkg-1) additive amount is to the influence curve figure of soil pH value.As shown in Figure 1, control group soil pH value is lower, applies blunt
PH has different degrees of raising after agent, and as PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite additive amount increases, soil pH value increases accordingly.
This is also one of the reason of passivator reduces plant content of beary metal.Wherein, 35gkg is applied-1PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite soil
Earth pH value is bigger than the pH value of other amount of application groups, is 7.66,0.79 pH unit is increased compared with blank control group.Addition changes
The reason of property vermiculite-montmorillonite composite material increases soil pH value may be due to MnO2By vermiculite-it is imvite modified after, make
It contains the soluble states base cation such as a large amount of Na, K, Ca, Mg, these base cations enter after soil that improve its alkali full
And degree, base cation can be swapped with soil hydrogen ion to react, so that it is horizontal to reduce soil hydrogen ion；In addition, PERFORMANCE OF MODIFIED VERMICULITE-
Alkaline matter contained by montmorillonite composite material, which enters after soil to discharge, can also be such that soil pH value increases.The study found that soil
In the lower situation of pH value, the H in soil+There are adsorption site competitive relation, H on clay mineral between heavy metal ion+It is dense
Degree is higher, bigger to the inhibiting effect of clay mineral absorption heavy metal effect；And with the raising of soil pH value, H in soil+It is right
The competitiveness that soil exchanges site can be due to OH-Increase and weaken, enhancing clay mineral is to the adsorption capacity of heavy metal.
2, the influence that PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite changes form cadmium content each in soil:
Influence of the PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material of Different adding amount to each form (passivation 150d) of cadmium in soil
As shown in Figure 2.Exchangeable species Cd activity is big, plays decisive action to the absorption of plant Cd, content decline to be illustrated to repair
Effect is better；Residual form Cd belongs to strong bound, and activity is minimum, is not easy to be absorbed by plants, content increase to be illustrated to repair
Effect is better.
As shown in Figure 2, add PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite after, in soil exchangeable species, carbonate combine state Cd ratio under
Drop, the range of decrease is respectively 46.06% (35gkg-1) 27.95% (25g7.9 of >-1) 22.46% (5g2.4 of >-1) > 20.06%
(15g0.0-1) 16.08% (2.5g6.0 of >-1) and 30.80% (35gkg-1) 23.32% (25g3.3 of >-1) > 19.09
(5g9.0-1) 18.24% (15g8.2 of >-1) 4.71% (2.5g.71 of >-1)；Residual form ratio increases, and amplification is successively are as follows:
65.40% (35gkg-1) 47.42% (25g7.4 of >-1) 31.85% (5g1.8 of >-1) 29.56% (15g9.5 of >-1) >
24.15% (2.5g4.1-1).And the iron and manganese oxides reference state, organically combine state content of Cd then change less in soil, this can
It can be since passivator causes soil pH value to increase, so that the relatively active form such as exchangeable species and carbonate combine state passes through
The effects of coordination, precipitating, is converted into residual form and is fixed；It is also likely to be since passivator has certain hole, specific surface
Product converts exchangeable species and carbonate combine state absorption to residual form and is fixed up.
3, influence of the PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite to green vegetables upgrowth situation:
Table 1 shows the influence that PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite grows green vegetables.Each processing green vegetables can germinate, 10d of emerging
Afterwards, the tender seedling of part green vegetables of control treatment is withered, turn yellow, butt rot is until dead, this may be the activity due to heavy metal
It is too high to cause.Green vegetables pass through the growth of 90d, and the biomass of control treatment is minimum, and the green vegetables upgrowth situation of other groups is with VER-
The difference of Mt additive amount and have differences.
As known from Table 1, compared with the control group, 2.5,5,15,25,35gkg are being added-1It is green after PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite
The cauline leaf fresh weight of dish has increased separately 12.77%, 37.19%, 50.39%, 68.72%, 83.93%；Root system fresh weight increases respectively
Add 13.16%, 28.07%, 41.23%, 59.65%, 78.07%；Plant height has increased separately 15.97%, 28.34%,
51.87%, 70.76%, 73.24%.Wherein 35gkg-1The plant growth effect of processing group is best, cauline leaf fresh weight, root system
Fresh weight, plant height are respectively 21.17g, 2.03g, 23.11cm, are 1.84 times, 1.78 times and 1.73 times of blank control group, improvement
Effect has reached extremely significant level (p < 0.05).As can be seen from Table 1, after adding PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite green vegetables stem
Leaf, root system, plant height biomass be in increase trend, this may be because PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite can with chesson, absorb water protect
Cadmium has been effectively relieved to the toxicity of green vegetables in fertilizer, to promote the growth of green vegetables.
The upgrowth situation of green vegetables under the different PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite additive amounts of table 1
Note: with column data, difference reaches 5% level of signifiance between the expression processing of different letters
4, influence of the PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite to position cadmium content each in green vegetables body:
Different types of plant absorbs the Mechanism of Physiological and Biochemical of heavy metal due to the difference of architectural characteristic and physiological property
It is different, therefore there were significant differences for its accumulation.It is generally acknowledged that the absorption and accumulation sequence to cadmium is followed successively by leaf vegetables ﹥ root tuber from big to small
Class ﹥ fruit class.And there is also differences in the distribution of plant different parts for cadmium content, the cumulative distribution sequence of most plants is root
﹥ stem ﹥ leaf ﹥ fruit.Since cadmium is mainly migrated by the accumulation in plant edible portion to human body, thus controls heavy metal cadmium and exist
The migration at the edible position of plant is to administer the important method of Cadmium Pollution in Soils.
After adding different amounts of PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite in potting soil, green vegetables stem and leaf part cadmium content changes such as Fig. 3 institute
Show, the variation of green vegetables root system part cadmium content is as shown in Figure 4.According to Fig. 3, Fig. 4, it can be seen that PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite addition
The content of heavy metal cadmium in green vegetables cauline leaf and root system can be effectively reduced.Compared with blank control group, addition 2.5,5,15,25,
35g·kg-1Afterwards, green vegetables stem and leaf part cadmium content reduces 20.75%, 32.08%, 28.30%, 39.62% respectively,
45.28%；Green vegetables root system part cadmium content reduces 11.28%, 19.55%, 31.58%, 27.07%, 40.60% respectively.
Each additive amount of PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite is preferable to the repairing effect of heavy metal Cd, and minimum is 2.5gkg-1, and stem and leaf part reduces
0.011mg/kg, root system part reduce 0.015mg/kg；Highest is 35gkg-1, stem and leaf part reduces 0.024mg/
Kg, root system part reduce 0.054mg/kg.The dominant mechanism that addition PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite can reduce cadmium content in green vegetables can
It can be that there is typical 2: 1 type layer structure, layer since vermiculite and montmorillonite are all a kind of natural phyllosilicate inorganic matters
Between domain there is preferable adsorption capacity to heavy metal ion, this special structure determines that vermiculite and montmorillonite have soil
Preferable moisture retention and cation exchange capacity (CEC), therefore can be used to adsorb fixed heavy metal, reduce the possibility being absorbed by plants
Property.And modified vermiculite-montmorillonite has stronger adsorption capacity, has adsorbed part cadmium ion in soil, has reduced easily quilt
The concentration of cadmium ions that plant root absorbs.
Four, conclusion
1, addition PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite improves soil pH value, and makes Cadmium in Soil by handing over plant availability is big
Change state, carbonate combine state is converted to the small residual form of plant availability.Compared with the control group, 35g5 and make-1Modification leech
Stone-montmorillonite makes soil exchangeable species and carbonate combine state cadmium content reduces by 46.06% and 30.80% respectively, and residual form
Cadmium content then increases 65.40%, and PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite is significant to waste filling area cadmium pollution soil repairing effect.
2, addition PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite can significantly improve green vegetables plant height, leaves and stems and root system portion biomass, reduce green vegetables
Each section heavy metal cadmium content, repairing effect increase with its additive amount and are increased.35g5 effect-1PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite processing
Compared with the control group, stem and leaf part and root system portion cadmium content reduce 45.28%, 40.60% to group respectively.This result of study is cash
The passivation reparation of stone filling area cadmium pollution soil provides new method, has certain reference value.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (5)
1. a kind of preparation method of PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material, which is characterized in that comprise the following specific steps that:
(1) vermiculite and the montmorillonite for weighing 18-22g respectively, are added to equipped with 90-110mL, 2.8-3.2mol/L KMnO4Solution
Conical flask in；
(2) the 2.8-3.2mol/L MnSO of 140-160mL is added into conical flask4Solution, to generate atropurpureus in conical flask
When pulverulent solids, conical flask is placed in 22-28 DEG C, gelation 1.8-2.2h on the shaking table of 110-130r/min；
(3) gelation vermiculite-montmorillonite mixture obtained in step (2) is taken out from conical flask, and is aged at room temperature；
After being aged 22-26h, the vermiculite-montmorillonite mixture is impregnated using ethanol solution and distilled water repeatedly, until soak pH value
It is in neutrality；
(4) vermiculite-montmorillonite mixture that step (3) obtains is put into 65-75 DEG C of drying box and is dried to get target institute
The MnO needed2PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material.
2. the preparation method of PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material according to claim 1, which is characterized in that the step
Suddenly weighed vermiculite and montmorillonite are specially to pass through 100 mesh vermiculites and the montmorillonite of removal of impurities in (1).
3. the preparation method of PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material according to claim 1, which is characterized in that the step
Suddenly vermiculite-montmorillonite mixture is impregnated using ethanol solution and distilled water repeatedly in (3) method particularly includes: first will be after ageing
Vermiculite-montmorillonite mixture pours into ethanol solution, and distilled water is added according still further to the ratio of 1:1, stirs evenly；Stir 8-
55-65min is stood after 12min, then soak and impurity are poured out, continuously adds ethanol solution and distilled water, repeats three
More than secondary；Finally, vermiculite-montmorillonite mixture is rinsed again with distilled water, until solution ph is in neutrality.
4. the preparation method of PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material according to claim 1, which is characterized in that the step
Suddenly MnO is obtained in (4)2After PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material, it is sealed in hermetic bag with spare.
5. a kind of PERFORMANCE OF MODIFIED VERMICULITE-montmorillonite composite material obtained using the preparation method as described in claim 1-4 is any is in cash
Application in the reparation of stone Subsided Reclamation Region cadmium pollution soil.
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