CN113174261A - Diatomite surface-loaded basic magnesium carbonate composite material and method for fixing soil lead - Google Patents
Diatomite surface-loaded basic magnesium carbonate composite material and method for fixing soil lead Download PDFInfo
- Publication number
- CN113174261A CN113174261A CN202110456498.2A CN202110456498A CN113174261A CN 113174261 A CN113174261 A CN 113174261A CN 202110456498 A CN202110456498 A CN 202110456498A CN 113174261 A CN113174261 A CN 113174261A
- Authority
- CN
- China
- Prior art keywords
- soil
- diatomite
- lead
- magnesium carbonate
- basic magnesium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- C09K17/04—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only applied in a physical form other than a solution or a grout, e.g. as granules or gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/71—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
- G01N21/73—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited using plasma burners or torches
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Health & Medical Sciences (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Plasma & Fusion (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A basic magnesium carbonate composite material loaded on the surface of diatomite and a method for fixing soil lead belong to the field of functional and environmental protection materials. The diatomite is used as a carrier, has certain water binding capacity, basic magnesium carbonate is modified on the surface of the diatomite, a spontaneous ion replacement route taking solubility difference as a driving force can be established, and metal cations in soil can be driven from a liquid phase to a solid phase of an adsorption material in a humid environment. Therefore, the basic magnesium carbonate-based diatomite composite material can realize the efficient synergy of the basic magnesium carbonate-based diatomite composite material and the basic magnesium carbonate-based diatomite composite material, and further provides a new idea for the development of an adsorption and fixation material for heavy metal lead ions in soil. In addition, the invention provides a reliable and rapid screening method for evaluating the soil heavy metal passivator, and the method has high practical application value.
Description
Technical Field
The invention relates to a method for fixed analysis of heavy metal lead ions in soil based on modified diatomite, in particular to a basic magnesium carbonate composite material loaded on the surface of diatomite, and discloses a method for rapidly evaluating the performance of a soil passivating agent, belonging to the field of functional and environmental protection materials.
Background
Soil is an important component of the ecosystem and is an irreplaceable material base for human survival and development. However, with the rapid development of urbanization and industrialization in modern society, the variety and the amount of agricultural chemicals are continuously increased, heavy metals enter the soil environment in large quantity, the quality of the cultivated soil environment is great, 1200 ten thousand tons of grains are polluted by the heavy metals in the soil every year in China, and the loss can reach 200 million yuan each year. According to the national soil pollution condition survey bulletin, the pollution phenomenon of heavy metals such as cadmium, arsenic, nickel, copper, lead and the like is not optimistic. Among them, with the wide application of lead in the fields of electroplating, metallurgy, etc., the lead pollution of soil is more and more serious. Pb is the only unnecessary trace element of human body, has considerable toxicity, accumulation and nondegradable property, can be accumulated in the environment for a long time, is enriched through a food chain layer, and finally harms human health, lead can seriously damage nerves, hematopoiesis, digestion, kidney, cardiovascular and endocrine systems, can cause blood diseases and encephalopathy, and can reduce the intelligence of children. Therefore, the remediation of lead contaminated soil is imminent.
At present, the technical principle of heavy metal contaminated soil remediation is mainly divided into two points, and firstly, the concentration of heavy metal reaches the safe release standard by reducing the total content of heavy metal in soil. And secondly, the mobility and the bioavailability of the heavy metal in the soil are reduced by changing the existing form of the heavy metal in the soil. Heavy metals are usually present in soil environments in four forms, the stability of which is usually in the order of residual > oxidizable > reducible > exchangeable. Wherein, the exchangeable state is easy to migrate, the biotoxicity is high, and the harm to the ecological environment is the greatest; the oxidizable state and the reducible state are relatively stable and can be released in the presence of certain acidity or redox to cause harm to the ecological environment; and the residue state can exist stably, is not easy to migrate and has minimum harm to the ecological environment. Therefore, how to transfer heavy metals from an unstable exchangeable state to a stable residue state has become a hot research focus in recent years. Among numerous remediation technologies, the in-situ chemical fixation technology for heavy metal contaminated soil has incomparable advantages and is widely applied, mainly depends on applying a passivating agent to the soil to control the biotoxicity, transformation and migration of heavy metals in the soil, and has the great advantages of simple operation, low cost, obvious performance and the like. However, the application of the conventional chemical passivator can change the physical and chemical properties of the soil, change the soil structure and further cause secondary pollution to the soil. Therefore, the passivating agent is the key for solving the soil pollution by applying an in-situ chemical fixing technology, and the problem that the passivating agent material which can effectively treat the lead pollution of the soil and is friendly to the soil environment is needed to be solved urgently is found. The natural mineral diatomite with rich sources and low price has a developed pore structure and a large number of active sites, and is beneficial to ion exchange; and the naturally derived diatomite has certain water retention and fertilizer retention, does not bring secondary pollution to the soil, and is beneficial to the restoration of the ecological function of the soil, so the diatomite has incomparable advantages in the remediation of the soil polluted by heavy metal lead.
Diatomaceous earth is generally a non-metallic mineral formed from silicate remains of diatoms after death of unicellular algae. The storage amount of diatomite in China is the second place in the world, and is mainly distributed in places such as Jilin Changbai, inner Mongolia red peak, Guangdong Xuweng, Yunnan Tengchong and the like. The chemical component of the diatomite is amorphous SiO2And also contains a small amount of Al2O3、Fe2O3、CaO、MgO、Na2O、K2O、P2O5And a small amount of organic matter. SiO in high-purity diatomite2The content of (A) is up to more than 85%, and the silicon-oxygen tetrahedron are mutually bridged to form a network structure. Due to the uncertainty of the number of silicon atoms, coordination defects and oxygen bridge defects exist in the network. The kieselguhr has a large number of natural microporous structures, can provide a large number of active sites for pollutant adsorption, and meanwhile, silicon hydroxyl on the surface of the kieselguhr is dehydrogenated in a humid environment to enable the surface of the kieselguhr to be electronegative, so that the kieselguhr has natural structural advantages for cation adsorption.
However, the natural diatomite has the defects of small porosity, low specific surface area and the like, so that the adsorption capacity of the diatomite is small, and therefore modification or modification treatment needs to be performed on the defects, so that the fixing effect on the heavy metal lead ions in the soil is improved. The basic magnesium carbonate is rich in active hydroxyl groups on the surface, is easy to combine with heavy metal ions, and has high adsorption activity and ion exchange capacity. The diatomite is used as a carrier, has certain water binding capacity, basic magnesium carbonate is modified on the surface of the diatomite, a spontaneous ion replacement route taking solubility difference as a driving force can be established, and metal cations in soil can be driven from a liquid phase to a solid phase of an adsorption material in a humid environment. Therefore, efficient synergy of the diatomite and the diatomite can be realized after the surface functionalization, and a new idea is provided for development of an adsorption and fixation material for heavy metal lead ions in soil.
Disclosure of Invention
The invention aims to provide a method for immobilizing and analyzing heavy metal lead in soil based on basic magnesium carbonate modified diatomite, and particularly relates to a method for mixing a basic magnesium carbonate loaded diatomite base material with soil polluted by heavy metal lead to obtain soil with immobilized heavy metal lead, providing a reliable and rapid screening method for evaluation of a soil heavy metal passivator, and having high practical application value. The internationally recognized BCR continuous leaching method is adopted to analyze the change of the form of heavy metal lead in the soil before and after the passivator is added, so as to reflect the fixing effect of the passivator on the lead in the soil.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of a diatomite surface-loaded basic magnesium carbonate composite material comprises the following steps:
(1) weighing 6g of diatomite and 3.5g of NaOH in a 500ml big beaker, adding 300ml of deionized water, ultrasonically stirring for 5min, then putting the mixture into a water bath kettle, and heating for 2h at 90 ℃; after the sample is cooled to room temperature, carrying out suction filtration, washing with deionized water and absolute ethyl alcohol for three times respectively, filtering, and drying at 60 ℃ for 4h to obtain NaOH-treated diatomite;
(2) taking 0.2-0.4g of NaOH-treated diatomite, adding 0.01-0.02mol of magnesium chloride hexahydrate and 0.03-0.06mol of urea into a polytetrafluoroethylene lining, adding 10ml of deionized water, mixing and stirring for 30min, transferring into a reaction kettle, carrying out hydrothermal reaction at 150 ℃ for 4h, naturally cooling to room temperature, washing with deionized water and absolute ethyl alcohol for three times respectively, filtering, and drying at 60 ℃ for 4h to obtain the basic magnesium carbonate composite material.
The diatomite surface-loaded basic magnesium carbonate composite material obtained by the method is used for passivating and fixing lead in soil, and the addition amount is 1-10%.
The invention also discloses an analysis characterization (evaluation) method for the immobilization of lead ions in soil by using the obtained diatomite surface loaded basic magnesium carbonate composite material, which comprises the following steps:
(1) simulating and culturing lead-polluted soil; naturally drying the collected soil, removing impurities such as plant roots, stones and the like in the soil sample, sieving with a 10-mesh sieve, and selecting a lead nitrate solution [ Pb (NO) with analytical purity) commonly used in laboratories as an exogenous heavy metal pollution liquid3)2]Adding the sample into a soil sample to be tested, preparing Pb heavy metal polluted soil, uniformly stirring, stably aging for 3 months under natural conditions, and waiting for standby application;
(2) uniformly mixing the passivator and the contaminated soil, and analyzing the morphological change of lead in the soil by adopting a BCR continuous leaching method; the lead forms include: residual state, oxidizable state, reducible state, exchangeable state.
Taking lead-containing soil subjected to simulated culture, respectively adding untreated original diatomite and basic magnesium carbonate-based diatomite passivators (0-10 wt%) according to a certain mass fraction (passivator/soil), adding deionized water with the mass percentage of 20% into the mixed soil, fully mixing and stirring, extracting lead ions under various forms according to a BCR method after fixing for a period of time, and determining the lead concentration by adopting an inductively coupled plasma atomic emission spectrometry (ICP) so as to analyze the existence forms of lead in the soil before and after the passivators are added.
The invention provides a method for fixing and analyzing heavy metal lead in soil based on basic magnesium carbonate modified diatomite, and the method evaluates the fixing effect of a soil heavy metal passivator and has important practical value.
The invention has the beneficial effects that: the method can effectively fix the heavy metal lead in the soil by utilizing the surface functionalization of the diatomite, has simple operation and low cost, and has excellent effect on treating the heavy metal lead in the soil.
Drawings
FIG. 1 is a scanning electron micrograph of (A) raw diatomaceous earth without any treatment and (B-C) basic magnesium carbonate-based diatomaceous earth.
FIG. 2 shows an XRD diffraction pattern of a basic magnesium carbonate loaded diatomite composite material on the surface layer.
FIG. 3 shows the change of lead form in soil before and after adding two passivators, namely raw diatomite and basic magnesium carbonate-based diatomite, which are not treated: the exogenous Pb concentration corresponding to the first graph was 500mg kg-1(ii) a The second graph corresponds to an exogenous Pb concentration of 1500mg kg-1。
Detailed Description
The present invention will be further illustrated with reference to the following examples, but the present invention is not limited to the following examples.
The preparation method of the diatomite surface-supported basic magnesium carbonate composite material used in the following examples comprises the following steps:
(1) weighing 6g of diatomite and 3.5g of NaOH in a 500ml big beaker, adding 300ml of deionized water, ultrasonically stirring for 5min, then putting the mixture into a water bath kettle, and heating for 2h at 90 ℃; after the sample is cooled to room temperature, carrying out suction filtration, washing with deionized water and absolute ethyl alcohol for three times respectively, filtering, and drying at 60 ℃ for 4h to obtain NaOH-treated diatomite;
(2) taking 0.2g of NaOH-treated diatomite, adding 0.01mol of magnesium chloride hexahydrate and 0.03mol of urea into a polytetrafluoroethylene lining, adding 10ml of deionized water, mixing and stirring for 30min, transferring into a reaction kettle, carrying out hydrothermal reaction at 150 ℃ for 4 hours, naturally cooling to room temperature, washing with deionized water and absolute ethyl alcohol for three times respectively, filtering, and drying at 60 ℃ for 4 hours to obtain the basic magnesium carbonate composite material.
Example 1:
(1) weighing 1.00kg of original soil sample which is sieved by a 10-mesh sieve into a plastic barrel, adding lead nitrate in a solution form, and preparing the exogenous lead with the concentration of 500mg kg-1After being uniformly stirred, the polluted soil is kept stand and aged for 90 days, and water is supplemented in the stabilizing process.
(2) Accurately weighing a plurality of parts of exogenous lead with the concentration of 500 mg-kg-1And (3) respectively adding two passivators with the mass ratio of 1% into 5.00g of the soil sample in a 50mL centrifuge tube, setting three passivators in each group in parallel, uniformly mixing, and standing and aging for 30 d.
(3) After the passivated soil is aged under the conditions, the BCR continuous leaching experiment is respectively used for measuring the lead morphological distribution in the soil, and then ICP is used for measuring the lead concentration.
Example 2:
(1) weighing 1.00kg of original soil sample which is sieved by a 10-mesh sieve into a plastic barrel, adding lead nitrate in a solution form, and preparing the exogenous lead with the concentration of 500mg kg-1After being uniformly stirred, the polluted soil is kept stand and aged for 90 days, and water is supplemented in the stabilizing process.
(2) Accurately weighing a plurality of parts of exogenous lead with the concentration of 500 mg-kg-15.00g of the soil sample is put into a 50mL centrifuge tube, two passivators with the mass ratio of 5% are respectively added, three passivators are arranged in each group in parallel, and the soil sample is evenly mixed and then stands and is aged for 30 days.
(3) After the passivated soil is aged under the conditions, the BCR continuous leaching experiment is respectively used for measuring the lead morphological distribution in the soil, and then ICP is used for measuring the lead concentration.
Example 3:
(1) weighing 1.00kg of original soil sample which is sieved by a 10-mesh sieve into a plastic barrel, adding lead nitrate in a solution form, and preparing the exogenous lead with the concentration of 500mg kg-1After being uniformly stirred, the polluted soil is kept stand and aged for 90 days, and water is supplemented in the stabilizing process.
(2) Accurately weighing a plurality of parts of exogenous lead with the concentration of 500 mg-kg-1And (3) respectively adding two passivators with the mass ratio of 10% into 5.00g of the soil sample in a 50mL centrifuge tube, setting three passivators in each group in parallel, uniformly mixing, and standing and aging for 30 d.
(3) After the passivated soil is aged under the conditions, the BCR continuous leaching experiment is respectively used for measuring the lead morphological distribution in the soil, and then ICP is used for measuring the lead concentration.
Example 4:
(1) weighing 1.00kg of original soil sample which is sieved by a 10-mesh sieve, putting the original soil sample into a plastic barrel, adding lead nitrate in a solution form, and preparing external lead with the concentration of 1500mg kg-1After being uniformly stirred, the polluted soil is kept stand and aged for 90 days, and water is supplemented in the stabilizing process.
(2) Accurately weighing a plurality of parts of exogenous lead with the concentration of 1500 mg-kg which is aged at the early stage-1And (3) respectively adding two passivators with the mass ratio of 1% into 5.00g of the soil sample in a 50mL centrifuge tube, setting three passivators in each group in parallel, uniformly mixing, and standing and aging for 30 d.
(3) After the passivated soil is aged under the conditions, the BCR continuous leaching experiment is respectively used for measuring the lead morphological distribution in the soil, and then ICP is used for measuring the lead concentration.
Example 5:
(1) weighing 1.00kg of original soil sample which is sieved by a 10-mesh sieve, putting the original soil sample into a plastic barrel, adding lead nitrate in a solution form, and preparing external lead with the concentration of 1500mg kg-1After being uniformly stirred, the polluted soil is kept stand and aged for 90 days, and water is supplemented in the stabilizing process.
(2) Accurately weighing a plurality of parts of exogenous lead with the concentration of 1500 mg-kg which is aged at the early stage-1Respectively adding 5.00g of soil sample into a 50mL centrifuge tube, respectively adding two passivators with the mass ratio of 5%, setting three passivators in each group in parallel, uniformly mixing, standing and ageingAnd (5) converting for 30 d.
(3) After the passivated soil is aged under the conditions, the BCR continuous leaching experiment is respectively used for measuring the lead morphological distribution in the soil, and then ICP is used for measuring the lead concentration.
Example 6:
(1) weighing 1.00kg of original soil sample which is sieved by a 10-mesh sieve, putting the original soil sample into a plastic barrel, adding lead nitrate in a solution form, and preparing external lead with the concentration of 1500mg kg-1After being uniformly stirred, the polluted soil is kept stand and aged for 90 days, and water is supplemented in the stabilizing process.
(2) Accurately weighing a plurality of parts of exogenous lead with the concentration of 1500 mg-kg which is aged at the early stage-1And (3) respectively adding two passivators with the mass ratio of 10% into 5.00g of the soil sample in a 50mL centrifuge tube, setting three passivators in each group in parallel, uniformly mixing, and standing and aging for 30 d.
(3) After the passivated soil is aged under the conditions, the BCR continuous leaching experiment is respectively used for measuring the lead morphological distribution in the soil, and then ICP is used for measuring the lead concentration.
Example 7:
(1) the above preferred materials (optimal lead concentration, optimal mass ratio) are mixed uniformly, left for aging for longer days, 60 days and 90 days
(2) After the passivated soil is aged under the conditions, the BCR continuous leaching experiment is respectively used for measuring the lead morphological distribution in the soil, and then ICP is used for measuring the lead concentration.
As can be seen from the first graph in fig. 3, in the control group, i.e. without any application of passivating agent, the Pb distribution is at its highest in the exchangeable state, followed in turn by the residue state, the reducible state, the oxidizable state. Therefore, the Pb concentration at the external source is 500 mg/kg-1The exchangeable-state lead which causes the most serious environmental pollution is the largest in the polluted soil. By introducing exogenous Pb at a concentration of 500 mg-kg-1The original diatomite is applied to the polluted soil, the amplitude of Pb form change is small, and the percentage content of exchangeable Pb with large biological toxic action is reduced from 73.46% to 61.86% along with the increase of the application amount of the original diatomite from 1% to 10%, so that the original diatomite is used as a passivator for the lead-polluted soil,can improve Pb-polluted soil, but the effect is not obvious. The composite passivator of the synthesized basic magnesium carbonate-based diatomite is applied to Pb-polluted soil, the exchangeable state of Pb can be obviously reduced, when 10% of the composite passivator is added, the exchangeable state Pb can be reduced from 75.27% to 37.45%, meanwhile, the most stable residue state is greatly increased, and the change trend is more obvious along with the increase of the application amount of the composite material. Exchangeable Pb which has great harm to organisms is converted into a residue state which cannot be absorbed by organisms, so that the basic magnesium carbonate-based diatomite composite material has obvious repairing effect as a passivating agent for repairing Pb-polluted soil.
The exogenous Pb concentration is 1500mg kg-1Respectively applying two passivators with different mass ratios to the polluted soil, wherein the change trend of the lead content of each form is 500mg kg-1The contaminated soil was substantially uniform. The original diatomite applied as the passivator has small influence on the Pb form in the soil, weak adsorption capacity and poor effect as the soil passivator. While the basic magnesium carbonate-based diatomite composite was applied to a high concentration of Pb-contaminated (1500 mg. kg)-1) In the soil, the transformation of Pb from an unstable form to a stable form in the soil can be promoted, and the degree of transformation is increased along with the increase of the application amount of the composite material, which is consistent with the conclusion, and the basic magnesium carbonate-based diatomite composite material can be directly used as a passivator for improving the Pb-polluted soil.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A preparation method of a diatomite surface-loaded basic magnesium carbonate composite material comprises the following steps:
(1) weighing 6g of diatomite and 3.5g of NaOH in a 500ml big beaker, adding 300ml of deionized water, ultrasonically stirring for 5min, then putting the mixture into a water bath kettle, and heating for 2h at 90 ℃; after the sample is cooled to room temperature, carrying out suction filtration, washing with deionized water and absolute ethyl alcohol for three times respectively, filtering, and drying at 60 ℃ for 4h to obtain NaOH-treated diatomite;
(2) taking 0.2-0.4g of NaOH-treated diatomite, then adding 0.01-0.02mol of magnesium chloride hexahydrate and 0.03-0.06mol of urea into a polytetrafluoroethylene lining, adding 10ml of deionized water, mixing and stirring for 30min, transferring into a reaction kettle, carrying out hydrothermal reaction for 4h at 150 ℃, naturally cooling to room temperature, washing with deionized water and absolute ethyl alcohol for three times respectively, filtering, and drying for 4h at 60 ℃ to obtain the basic magnesium carbonate composite material.
2. The diatomite surface-loaded basic magnesium carbonate composite material obtained by the method according to claim 1.
3. The application of the diatomite surface-loaded basic magnesium carbonate composite material obtained by the method according to claim 1 is used for passivating and fixing lead in soil, and the addition amount is 1% -10%.
4. The analytical characterization method of the diatomite surface-loaded basic magnesium carbonate composite material obtained by the method according to claim 1 for lead ion fixation in soil comprises the following steps:
(1) simulating and culturing lead-polluted soil; naturally drying the collected soil, removing impurities such as plant roots, stones and the like in the soil sample, sieving with a 10-mesh sieve, and selecting a lead nitrate solution [ Pb (NO) with analytical purity) commonly used in laboratories as an exogenous heavy metal pollution liquid3)2]Adding the sample into a soil sample to be tested, preparing Pb heavy metal polluted soil, uniformly stirring, stably aging for 3 months under natural conditions, and waiting for standby application;
(2) uniformly mixing the passivator and the contaminated soil, and analyzing the morphological change of lead in the soil by adopting a BCR continuous leaching method; the lead forms include: residual state, oxidizable state, reducible state, exchangeable state.
Taking lead-containing soil subjected to simulated culture, respectively adding untreated original diatomite and basic magnesium carbonate-based diatomite passivators (0-10 wt%) according to a certain mass fraction (passivator/soil), adding deionized water with the mass percentage of 20% into the mixed soil, fully mixing and stirring, extracting lead ions under various forms according to a BCR method after fixing for a period of time, and determining the lead concentration by adopting an inductively coupled plasma atomic emission spectrometry (ICP) so as to analyze the existence forms of lead in the soil before and after the passivators are added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110456498.2A CN113174261B (en) | 2021-04-26 | 2021-04-26 | Diatomite surface-loaded basic magnesium carbonate composite material and method for fixing soil lead |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110456498.2A CN113174261B (en) | 2021-04-26 | 2021-04-26 | Diatomite surface-loaded basic magnesium carbonate composite material and method for fixing soil lead |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113174261A true CN113174261A (en) | 2021-07-27 |
| CN113174261B CN113174261B (en) | 2021-12-24 |
Family
ID=76926518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110456498.2A Active CN113174261B (en) | 2021-04-26 | 2021-04-26 | Diatomite surface-loaded basic magnesium carbonate composite material and method for fixing soil lead |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113174261B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114522662A (en) * | 2022-03-31 | 2022-05-24 | 安徽建筑大学 | Modified honeycomb stone adsorption material, preparation method thereof and application thereof in adsorption of heavy metal ions |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4308065A (en) * | 1977-09-30 | 1981-12-29 | Walls Mycelo Jose | Lightweight porous aggregate comprising alkali metal borosilicoaluminate and process for the preparation thereof |
| CN1864851A (en) * | 2006-04-13 | 2006-11-22 | 浙江三鼎科技有限公司 | Method for preparing modified composite absorption agent of diatomite |
| CN101549279A (en) * | 2009-05-15 | 2009-10-07 | 北京工业大学 | Method for improving specific surface area of diatomite |
| CN107469765A (en) * | 2017-08-25 | 2017-12-15 | 北京工业大学 | A kind of preparation method of diatomite/ferrous acid magnesium base composite material |
| CN107987835A (en) * | 2017-12-12 | 2018-05-04 | 云南农业大学 | A kind of heavy-metal contaminated soil composite passivant and its preparation method and application |
| CN110156054A (en) * | 2019-07-05 | 2019-08-23 | 山东理工大学 | A kind of preparation method of rhombohedron anhydrous magnesium carbonate |
| CN111592887A (en) * | 2020-04-08 | 2020-08-28 | 福建龙净环保股份有限公司 | Composite heavy metal stabilizing agent composition for heavy metal lead and cadmium polluted acid soil and preparation method thereof |
| CN111704142A (en) * | 2020-06-18 | 2020-09-25 | 北京工业大学 | Method for preparing sodium ferric silicate from diatomite for photo-reduction of Cr (VI) |
-
2021
- 2021-04-26 CN CN202110456498.2A patent/CN113174261B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4308065A (en) * | 1977-09-30 | 1981-12-29 | Walls Mycelo Jose | Lightweight porous aggregate comprising alkali metal borosilicoaluminate and process for the preparation thereof |
| CN1864851A (en) * | 2006-04-13 | 2006-11-22 | 浙江三鼎科技有限公司 | Method for preparing modified composite absorption agent of diatomite |
| CN101549279A (en) * | 2009-05-15 | 2009-10-07 | 北京工业大学 | Method for improving specific surface area of diatomite |
| CN107469765A (en) * | 2017-08-25 | 2017-12-15 | 北京工业大学 | A kind of preparation method of diatomite/ferrous acid magnesium base composite material |
| CN107987835A (en) * | 2017-12-12 | 2018-05-04 | 云南农业大学 | A kind of heavy-metal contaminated soil composite passivant and its preparation method and application |
| CN110156054A (en) * | 2019-07-05 | 2019-08-23 | 山东理工大学 | A kind of preparation method of rhombohedron anhydrous magnesium carbonate |
| CN111592887A (en) * | 2020-04-08 | 2020-08-28 | 福建龙净环保股份有限公司 | Composite heavy metal stabilizing agent composition for heavy metal lead and cadmium polluted acid soil and preparation method thereof |
| CN111704142A (en) * | 2020-06-18 | 2020-09-25 | 北京工业大学 | Method for preparing sodium ferric silicate from diatomite for photo-reduction of Cr (VI) |
Non-Patent Citations (3)
| Title |
|---|
| YUCHENG DU等: "Mg3Si4O10(OH)2 and MgFe2O4 in situ grown on diatomite: Highly efficient adsorbents for the removal of Cr(VI)", 《MICROPOROUS AND MESOPOROUS MATERIALS》 * |
| 孙领民等: "低品位硅藻土液相转化合成方钠石重金属吸附剂", 《化学研究》 * |
| 陈留刚等: "机械活化不同前驱体混合物合成镁橄榄石", 《第六届国际耐火材料会议》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114522662A (en) * | 2022-03-31 | 2022-05-24 | 安徽建筑大学 | Modified honeycomb stone adsorption material, preparation method thereof and application thereof in adsorption of heavy metal ions |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113174261B (en) | 2021-12-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Wen et al. | Comparative sorption kinetic studies of ammonium onto zeolite | |
| Long et al. | Packed bed column studies on lead (II) removal from industrial wastewater by modified Agaricus bisporus | |
| Pathak et al. | Experimental and kinetic studies for phycoremediation and dye removal by Chlorella pyrenoidosa from textile wastewater | |
| Chu et al. | Biosorption of heavy metals and dyes from industrial effluents by microalgae | |
| Mallick et al. | Removal of inorganic ions from wastewaters by immobilized microalgae | |
| CN102527347B (en) | Magnetic chitosan/cationic surface active agent modified zeolite adsorbent and preparation method and application thereof | |
| CN110756166A (en) | Corncob-loaded magnesium-modified adsorption material and preparation method and application thereof | |
| CN110396488B (en) | Mixed bacterial system for degrading polycyclic aromatic hydrocarbon pollutants and application method | |
| CN103623782A (en) | Preparation method for composite magnetic adsorption material and method for removing heavy metal ions in waste water | |
| CN109092873B (en) | Method for repairing arsenic-polluted soil by using plant-microorganism combination | |
| CN104117529B (en) | A kind of in-situ remediation method containing heavy metal acid ground | |
| Amaya et al. | Microbial biomass in batch and continuous system | |
| CN113174261B (en) | Diatomite surface-loaded basic magnesium carbonate composite material and method for fixing soil lead | |
| CN108707598B (en) | Method for enhancing denitrification of denitrifying bacteria by taking filamentous fungi as carrier | |
| CN112427450A (en) | Preparation and application of thermal modified phosphorite flotation tailing material for repairing heavy metal polluted water body and soil | |
| CN111672465A (en) | Preparation method and application of ferroferric oxide-manganese dioxide/mulberry stem biochar composite material | |
| CN110241111B (en) | Method for enhancing bacterial chromium reduction capacity by modified activated carbon immobilized cells | |
| CN114832778A (en) | Shaddock peel biochar for adsorbing arsenic as well as preparation method and application thereof | |
| CN111014280A (en) | Method for repairing cadmium-polluted soil by using bacteria-montmorillonite compound | |
| CN113019323B (en) | Ultrasonic activated biochar and preparation method and application thereof | |
| CN107362776B (en) | Sulfobetaine and inorganic salt composite modified clay, preparation method and application thereof | |
| CN105567575A (en) | New Purpureocillium sp strain F1 and application thereof | |
| CN112898987A (en) | Magnetic composite material for removing heavy metals in soil and preparation and application thereof | |
| CN112774625A (en) | Zirconium oxide doped magnetic high-surface active carbon composite material, preparation method and application | |
| He et al. | Preparation of different activated sludge immobilized carriers and their organic wastewater treatment performance by microbial community |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |