CN113457625A - Modified fly ash material for in-situ endogenous pollution control of water body, preparation method and application - Google Patents
Modified fly ash material for in-situ endogenous pollution control of water body, preparation method and application Download PDFInfo
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- CN113457625A CN113457625A CN202110696581.7A CN202110696581A CN113457625A CN 113457625 A CN113457625 A CN 113457625A CN 202110696581 A CN202110696581 A CN 202110696581A CN 113457625 A CN113457625 A CN 113457625A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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Abstract
The invention discloses a modified fly ash material for controlling in-situ endogenous pollution of a water body, a preparation method and application thereof, wherein the material comprises the following substances in percentage by mass: 35-70% of fly ash, 25-60% of montmorillonite, 0.1-2% of polymerizer, 0.1-2% of distilled water and 0.1-1% of modifier. The modified fly ash material is applied to water, has good long-acting property for inhibiting the release of total phosphorus of sediments, continuously reduces the concentration of the total phosphorus of overlying water by time, and is suitable for continuously treating the water polluted by endogenous phosphorus.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of solid wastes and water pollution control, and particularly relates to a modified fly ash material for in-situ endogenous pollution control of a water body, and a preparation method and application thereof.
Background
Endogenous pollution of water bodies has important influence on water quality deterioration, wherein release of endogenous phosphorus is an important reason for eutrophication of many water bodies. Common water body endogenous pollution treatment means comprise a biological method, a chemical method and a physical method; however, the effect of controlling the pollution of endogenous phosphorus by a single method is not ideal. The biological method has the advantages of low energy consumption and low cost, but the required period is longer, the effect is slow, the biomass is not easy to control, and the influence of environmental factors is larger. The chemical method has quick response and high phosphorus removal effect, but is easy to generate side effects and secondary pollution risks, and after long-time accumulation, the chemical method may cause harm to human health and has the risk of damaging the ecological environment; the physical method is simple and convenient, has high treatment efficiency, but has high implementation cost and is possibly influenced by high material price; in conclusion, under the comparative study of various methods, the method for controlling endogenous phosphorus at an interface in situ through the synergy of chemical adsorption and physical precipitation is a feasible method, and the premise is that a novel, cheap and efficient material can be prepared.
The fly ash has great pollution control potential due to unique physical characteristics and chemical characteristics and extremely low cost, and long-term research and development of the fly ash for pollution control make great progress along with continuous understanding and exploration of scientific researchers on the properties of the fly ash, and an important step is brought forward in the utilization of the fly ash.
Disclosure of Invention
In view of the above, the main object of the present invention is to provide a modified fly ash material for in-situ endogenous pollution control of water, and a preparation method and an application thereof.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the embodiment of the invention provides a modified fly ash material for controlling in-situ endogenous pollution of a water body, which comprises the following substances in percentage by mass: 35-70% of fly ash, 25-60% of montmorillonite, 0.1-2% of polymerizer, 0.1-2% of distilled water and 0.1-1% of modifier.
In the scheme, the polymerizing agent is sodium silicate, epoxy glue or polyurethane.
In the scheme, the modifier is an alkali modifier, specifically sodium hydroxide; or the modifier is an acid modifier, specifically hydrochloric acid or sulfuric acid; or the modifier is a lanthanum modifier, specifically lanthanum chloride, lanthanum carbonate or lanthanum oxide.
The embodiment of the invention also provides a preparation method of the modified fly ash material for controlling the in-situ endogenous pollution of the water body, which comprises the following steps:
step 1: modifying the fly ash to obtain modified fly ash;
step 2: 7/3, uniformly stirring the modified fly ash and montmorillonite, adding a polymerization agent for pugging treatment, and continuously stirring until the mixture is viscous to obtain a fly ash mixed sticky substance;
and step 3: mixing the fly ash with sticky substances to prepare a fly ash material green body;
and 4, step 4: and placing the raw fly ash material blank in a muffle furnace for calcining to obtain a finished modified fly ash pellet product.
In the above scheme, the step 1 specifically includes: grinding the fly ash and removing impurities; placing the fly ash into an acid solution with the concentration of 2mol/L, carrying out shake modification culture in a constant-temperature shake box at 25 ℃ at 200r/min, taking out the conical flask after 36h, standing for mud-water separation, washing supernatant to be neutral by using deionized water, and drying to obtain the acid modified fly ash.
In the above scheme, the step 1 specifically includes: respectively placing the fly ash into sodium hydroxide solution with the concentration of 2mol/L, performing shake modification culture in a constant-temperature shaking box at 25 ℃ and 200r/min, taking out the conical flask after 36h, standing for mud-water separation, washing supernatant to be neutral by using deionized water, and drying to obtain the alkali modified fly ash.
In the above scheme, the step 1 specifically includes: respectively weighing 10 g of prepared fly ash into a 250ml conical flask; adding deionized water into a conical flask, and dispersing fly ash powder by ultrasonic waves to obtain fly ash dispersion liquid; adding lanthanum chloride solid particles into the fly ash dispersion liquid, preparing a lanthanum chloride solution with the concentration of 1.5mol/L, putting a rotor into a magnetic stirrer, rotationally stirring at the rotating speed of 25 ℃ and 250r/min for 10 hours, sealing a conical flask by using a preservative film, transferring the conical flask into a water bath oscillation box, setting the oscillation strength of 180r at 25 ℃, oscillating for 24 hours, washing supernate to be neutral by using deionized water, and drying to obtain the lanthanum modified fly ash.
In the above scheme, the step 2 specifically comprises: the preparation method comprises the steps of placing lanthanum modified fly ash powder and montmorillonite into a grinder to be ground, then sieving the ground materials with a 200-mesh sieve to obtain raw materials with the same particle size, respectively weighing the lanthanum modified fly ash powder and the montmorillonite with the mass proportion of 7/3, adding deionized water to mix after stirring the materials till the materials are fully mixed, adding 1-3% of sodium silicate to fully mix till the materials are in a viscous state, and then adding polyester adhesive to prepare the viscous material.
In the above scheme, the step 3 specifically comprises: and (3) twisting the prepared fly ash mixed sticky matter into a long strip, preparing a cylindrical long strip with the diameter of 3-11mm according to the standard particle size, and performing compression molding on the pasty raw material by a pill making machine according to a pill making mold with the diameter of 3-11mm to prepare a fly ash material green body with the particle size of 3-11 mm.
An application of a modified fly ash material for controlling in-situ endogenous pollution of a water body is applied to control of endogenous phosphorus pollution of the water body.
Compared with the prior art, the modified fly ash material disclosed by the invention is applied to water, has good long-acting property for inhibiting the release of total phosphorus of sediments, continuously reduces the concentration of the total phosphorus of overlying water by time, and is suitable for continuously treating the water polluted by endogenous phosphorus.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, article, or apparatus that comprises the element.
The embodiment of the invention provides a modified fly ash material for controlling in-situ endogenous pollution of a water body, which comprises the following substances in percentage by mass: 35-70% of fly ash, 25-60% of montmorillonite, 0.1-2% of polymerizer, 0.1-2% of distilled water and 0.1-1% of modifier.
The polymerization agent is sodium silicate, epoxy glue or polyurethane.
The modifier is an alkali modifier, and specifically adopts sodium hydroxide.
The modifier is an acid modifier, and particularly hydrochloric acid or sulfuric acid.
The modifier is a lanthanum modifier, specifically lanthanum chloride, lanthanum carbonate or lanthanum oxide.
Example 1
The embodiment 1 of the invention provides a modified fly ash material for controlling in-situ endogenous pollution of a water body, which comprises the following substances in percentage by mass: 45% of fly ash, 25% of montmorillonite, 0.1% of sodium silicate, 0.1% of distilled water and 0.1% of sodium hydroxide.
Example 2
The embodiment 2 of the invention provides a modified fly ash material for controlling in-situ endogenous pollution of a water body, which comprises the following substances in percentage by mass: 70% of fly ash, 60% of montmorillonite, 0.1% of epoxy glue, 0.1% of distilled water and 0.1% of sodium hydroxide.
Example 3
The embodiment 3 of the invention provides a modified fly ash material for controlling in-situ endogenous pollution of a water body, which comprises the following substances in percentage by mass: 50% of fly ash, 50% of montmorillonite, 1% of polyurethane, 1% of distilled water and 1% of sodium hydroxide.
Example 4
The embodiment 4 of the invention provides a modified fly ash material for controlling in-situ endogenous pollution of a water body, which comprises the following substances in percentage by mass: 45% of fly ash, 25% of montmorillonite, 0.1% of sodium silicate, 0.1% of distilled water and 0.1% of hydrochloric acid.
Example 5
The embodiment 5 of the invention provides a modified fly ash material for controlling in-situ endogenous pollution of a water body, which comprises the following substances in percentage by mass: 70% of fly ash, 60% of montmorillonite, 0.1% of epoxy glue, 0.1% of distilled water and 0.1% of hydrochloric acid.
Example 6
The embodiment 6 of the invention provides a modified fly ash material for controlling in-situ endogenous pollution of a water body, which comprises the following substances in percentage by mass: 50% of fly ash, 50% of montmorillonite, 1% of polyurethane, 1% of distilled water and 0.1% of hydrochloric acid.
Example 7
Embodiment 7 of the invention provides a modified fly ash material for in-situ endogenous pollution control of a water body, which comprises the following substances in percentage by mass: 45% of fly ash, 25% of montmorillonite, 0.1% of sodium silicate, 0.1% of distilled water and 0.1% of sulfuric acid.
Example 8
The embodiment 8 of the invention provides a modified fly ash material for controlling in-situ endogenous pollution of a water body, which comprises the following substances in percentage by mass: 70% of fly ash, 60% of montmorillonite, 0.1% of epoxy glue, 0.1% of distilled water and 0.1% of sulfuric acid.
Example 9
Embodiment 9 of the present invention provides a modified fly ash material for in-situ endogenous pollution control of a water body, which comprises the following components by mass: 50% of fly ash, 50% of montmorillonite, 1% of polyurethane, 1% of distilled water and 1% of sulfuric acid.
Example 10
The embodiment 10 of the invention provides a modified fly ash material for in-situ endogenous pollution control of a water body, which comprises the following substances in percentage by mass: 45% of fly ash, 25% of montmorillonite, 0.1% of sodium silicate, 0.1% of distilled water and 1% of lanthanum chloride.
Example 11
The embodiment 11 of the invention provides a modified fly ash material for in-situ endogenous pollution control of a water body, which comprises the following substances in percentage by mass: 70% of fly ash, 60% of montmorillonite, 0.1% of epoxy glue, 0.1% of distilled water and 0.1% of lanthanum chloride.
Example 12
The embodiment 12 of the invention provides a modified fly ash material for in-situ endogenous pollution control of a water body, which comprises the following substances in percentage by mass: 50% of fly ash, 50% of montmorillonite, 1% of polyurethane, 1% of distilled water and 1% of lanthanum chloride.
Example 13
The embodiment 13 of the invention provides a modified fly ash material for in-situ endogenous pollution control of a water body, which comprises the following substances in percentage by mass: 45% of fly ash, 25% of montmorillonite, 0.1% of sodium silicate, 0.1% of distilled water and 0.1% of lanthanum carbonate.
Example 14
The embodiment 14 of the invention provides a modified fly ash material for in-situ endogenous pollution control of a water body, which comprises the following substances in percentage by mass: 70% of fly ash, 60% of montmorillonite, 0.1% of epoxy glue, 0.1% of distilled water and 0.1% of lanthanum carbonate.
Example 15
The embodiment 15 of the invention provides a modified fly ash material for in-situ endogenous pollution control of a water body, which comprises the following substances in percentage by mass: 70% of fly ash, 60% of montmorillonite, 0.1% of polyurethane, 0.1% of distilled water and 0.1% of lanthanum carbonate.
Example 16
The embodiment 16 of the invention provides a modified fly ash material for in-situ endogenous pollution control of a water body, which comprises the following substances in percentage by mass: 45% of fly ash, 25% of montmorillonite, 0.1% of sodium silicate, 0.1% of distilled water and 0.1% of lanthanum oxide.
Example 17
The embodiment 17 of the invention provides a modified fly ash material for controlling in-situ endogenous pollution of a water body, which comprises the following substances in percentage by mass: 70% of fly ash, 60% of montmorillonite, 0.1% of epoxy glue, 0.1% of distilled water and 0.1% of lanthanum oxide.
Example 18
The embodiment 18 of the invention provides a modified fly ash material for in-situ endogenous pollution control of a water body, which comprises the following substances in percentage by mass: 50% of fly ash, 50% of montmorillonite, 1% of polyurethane, 1% of distilled water and 1% of lanthanum oxide.
The embodiment of the invention also provides a preparation method of the modified fly ash material for controlling the in-situ endogenous pollution of the water body, which adopts the modified fly ash material as described in any one of the embodiments 1-3, and the preparation method comprises the following steps:
step 1: modifying the fly ash to obtain alkali modified fly ash;
specifically, the fly ash is respectively placed in sodium hydroxide solution with the concentration of 2mol/L, shake modified culture is carried out in a constant-temperature shaking box at the temperature of 25 ℃ and at the speed of 200r/min, a conical flask is taken out after 36 hours, standing is carried out for mud-water separation, supernatant liquid is washed to be neutral by deionized water, and the alkali modified fly ash is obtained after drying.
Step 2: 7/3, mixing the alkali modified fly ash and montmorillonite, uniformly stirring, adding sodium silicate, epoxy glue or polyurethane for pugging, and continuously stirring to a viscous state to obtain a fly ash mixed sticky substance;
specifically, the alkali modified fly ash powder and montmorillonite are placed in a grinder to be ground and then sieved by a 200-mesh sieve to obtain raw materials with the same particle size, the lanthanum modified fly ash powder and the montmorillonite with the mass proportion of 7/3 are respectively weighed, deionized water is added to be mixed after the lanthanum modified fly ash powder and the montmorillonite are fully mixed after stirring, 1-3% of sodium silicate is added to be fully mixed until the mixture is in a viscous state, and then polyester adhesive is added to prepare the viscous aggregate.
And step 3: mixing the fly ash with sticky substances to prepare a fly ash material green body;
specifically, the prepared fly ash mixed sticky matter is kneaded into a long strip, a cylindrical long strip with the diameter of 3-11mm is prepared according to the standard particle size, and the pasty raw material is pressed and molded by a pill making machine according to a pill making mold with the diameter of 3-11mm to prepare a fly ash material green body with the particle size of 3-11 mm.
And 4, step 4: and placing the raw fly ash material blank in a muffle furnace for calcining to obtain a finished modified fly ash pellet product.
Specifically, the raw coal ash material blank is placed in a constant-temperature drying oven to be subjected to shaping pretreatment for 4 hours at 85 ℃, after the coal ash pellets have a stable shape, the coal ash pellets are placed in a muffle furnace, a temperature curve is set to preheat for 1 hour at 250 ℃, the temperature is raised to 900 ℃ and 1000 ℃, then the mixture is calcined for 4 hours, and after the calcination is finished, the pellets are taken out to obtain a modified coal ash pellet finished product.
The embodiment of the invention also provides a preparation method of the modified fly ash material for controlling the in-situ endogenous pollution of the water body, which adopts the modified fly ash material as described in any one of the embodiments 4 to 9, and the preparation method comprises the following steps:
step 1: modifying the fly ash to obtain acid modified fly ash;
specifically, the fly ash is ground and then subjected to impurity removal; placing the fly ash into an acid solution with the concentration of 2mol/L, carrying out shake modification culture in a constant-temperature shake box at 25 ℃ at 200r/min, taking out the conical flask after 36h, standing for mud-water separation, washing supernatant to be neutral by using deionized water, and drying to obtain the acid modified fly ash.
Step 2: 7/3, uniformly stirring the acid modified fly ash and montmorillonite, adding sodium silicate, epoxy glue or polyurethane for pugging, and continuously stirring until the mixture is viscous to obtain a fly ash mixed sticky substance;
specifically, the modified fly ash powder and montmorillonite are placed in a grinder to be ground and then sieved by a 200-mesh sieve to obtain raw materials with the same particle size, the lanthanum modified fly ash powder and the montmorillonite with the mass proportion of 7/3 are respectively weighed, deionized water is added to be mixed after the lanthanum modified fly ash powder and the montmorillonite are fully mixed, 1-3% of sodium silicate is added to be fully mixed to be in a viscous state, and then polyester adhesive is added to prepare the viscous aggregate.
And step 3: mixing the fly ash with sticky substances to prepare a fly ash material green body;
specifically, the prepared fly ash mixed sticky matter is kneaded into a long strip, a cylindrical long strip with the diameter of 3mm is prepared according to the standard particle size, and the pasty raw material is pressed and molded by a pelleting machine according to a pelleting die with the diameter of 3mm to prepare a fly ash material green body with the particle size of 3-9 mm.
And 4, step 4: and placing the raw fly ash material blank in a muffle furnace for calcining to obtain a finished modified fly ash pellet product.
Specifically, the raw coal ash material blank is placed in a constant-temperature drying oven to be subjected to shaping pretreatment for 4 hours at 85 ℃, after the coal ash pellets have a stable shape, the coal ash pellets are placed in a muffle furnace, a temperature curve is set to preheat for 1 hour at 250 ℃, the temperature is raised to 900 ℃ and 1000 ℃, then the mixture is calcined for 4 hours, and after the calcination is finished, the pellets are taken out to obtain a modified coal ash pellet finished product.
The embodiment of the invention also provides a preparation method of the modified fly ash material for controlling the in-situ endogenous pollution of the water body, which adopts the modified fly ash material as described in any one of the embodiments 10 to 18, and the preparation method comprises the following steps:
step 1: modifying the fly ash to obtain lanthanum modified fly ash;
specifically, respectively weighing 10 g of prepared fly ash and 10 g of original fly ash in a 250ml conical flask; adding deionized water into a conical flask, and dispersing fly ash powder by ultrasonic waves to obtain fly ash dispersion liquid; adding lanthanum chloride solid particles into the fly ash dispersion liquid, preparing a lanthanum chloride solution with the concentration of 1.5mol/L, putting a rotor into a magnetic stirrer, rotationally stirring at the rotating speed of 25 ℃ and 250r/min for 10 hours, sealing a conical flask by using a preservative film, transferring the conical flask into a water bath oscillation box, setting the oscillation strength of 180r at 25 ℃, oscillating for 24 hours, washing supernate to be neutral by using deionized water, and drying to obtain the lanthanum modified fly ash.
Step 2: 7/3, uniformly stirring, adding sodium silicate, epoxy glue or polyurethane for pugging treatment, and continuously stirring to a viscous state to obtain a fly ash mixed sticky substance;
specifically, the alkali modified fly ash powder and montmorillonite are placed in a grinder to be ground and then sieved by a 200-mesh sieve to obtain raw materials with the same particle size, the lanthanum modified fly ash powder and the montmorillonite with the mass proportion of 7/3 are respectively weighed, deionized water is added to be mixed after the lanthanum modified fly ash powder and the montmorillonite are fully mixed after stirring, 1-3% of sodium silicate is added to be fully mixed until the mixture is in a viscous state, and then polyester adhesive is added to prepare the viscous aggregate.
And step 3: mixing the fly ash with sticky substances to prepare a fly ash material green body;
specifically, the prepared fly ash mixed sticky matter is kneaded into a long strip, a cylindrical long strip with the diameter of 3-11mm is prepared according to the standard particle size, and the pasty raw material is pressed and molded by a pill making machine according to a pill making mold with the diameter of 3-11mm to prepare a fly ash material green body with the particle size of 3-11 mm.
And 4, step 4: and placing the raw fly ash material blank in a muffle furnace for calcining to obtain a finished modified fly ash pellet product.
Specifically, the raw coal ash material blank is placed in a constant-temperature drying oven to be subjected to shaping pretreatment for 4 hours at 85 ℃, after the coal ash pellets have a stable shape, the coal ash pellets are placed in a muffle furnace, a temperature curve is set to preheat for 1 hour at 250 ℃, the temperature is raised to 900 ℃ and 1000 ℃, then the mixture is calcined for 4 hours, and after the calcination is finished, the pellets are taken out to obtain a modified coal ash pellet finished product.
The modified fly ash material prepared by the embodiment is applied to control of endogenous phosphorus pollution in water.
Preparing 5mg/L phosphoric acid solution, respectively carrying out adsorption experiments on lanthanum modified fly ash and montmorillonite with different proportions by using fly ash pellets with different temperatures and different particle sizes and prepared under different roasting times at the addition of 2g/L, wherein the adsorption efficiency of the phosphate in an experimental water body is shown in the table below, and through orthogonal experiments, the optimal synthesis conditions are that the fly ash/montmorillonite is 7:3, the roasting temperature is 900 ℃, the roasting time is 4h and the particle size is less than 3 mm.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. The modified fly ash material for controlling in-situ endogenous pollution of a water body is characterized by comprising the following substances in percentage by mass: 35-70% of fly ash, 25-60% of montmorillonite, 0.1-2% of polymerizer, 0.1-2% of distilled water and 0.1-1% of modifier.
2. The modified fly ash pellet material for in-situ endogenous pollution control of a water body of claim 1, wherein the polymerizer is sodium silicate, epoxy glue or polyurethane.
3. The modified fly ash pellet material for in-situ endogenous pollution control of water bodies as claimed in claim 1 or 2, wherein the modifier is an alkali modifier, in particular sodium hydroxide; or the modifier is an acid modifier, specifically hydrochloric acid or sulfuric acid; or the modifier is a lanthanum modifier, specifically lanthanum chloride, lanthanum carbonate or lanthanum oxide.
4. A method for preparing a modified fly ash material for in situ endogenous pollution control of a water body as claimed in any one of claims 1 to 3, which comprises:
step 1: modifying the fly ash to obtain modified fly ash;
step 2: 7/3, uniformly stirring the modified fly ash and montmorillonite, adding a polymerization agent for pugging treatment, and continuously stirring until the mixture is viscous to obtain a fly ash mixed sticky substance;
and step 3: mixing the fly ash with sticky substances to prepare a fly ash material green body;
and 4, step 4: and placing the raw fly ash material blank in a muffle furnace for calcining to obtain a finished modified fly ash pellet product.
5. The method for preparing the modified fly ash material for in-situ endogenous pollution control of the water body according to claim 4, wherein the step 1 specifically comprises the following steps: grinding the fly ash and removing impurities; placing the fly ash into an acid solution with the concentration of 2mol/L, carrying out shake modification culture in a constant-temperature shake box at 25 ℃ at 200r/min, taking out the conical flask after 36h, standing for mud-water separation, washing supernatant to be neutral by using deionized water, and drying to obtain the acid modified fly ash.
6. The method for preparing the modified fly ash material for in-situ endogenous pollution control of the water body according to claim 4, wherein the step 1 specifically comprises the following steps: respectively placing the fly ash into sodium hydroxide solution with the concentration of 2mol/L, performing shake modification culture in a constant-temperature shaking box at 25 ℃ and 200r/min, taking out the conical flask after 36h, standing for mud-water separation, washing supernatant to be neutral by using deionized water, and drying to obtain the alkali modified fly ash.
7. The method for preparing the modified fly ash material for in-situ endogenous pollution control of the water body according to claim 4, wherein the step 1 specifically comprises the following steps: respectively weighing 10 g of prepared fly ash into a 250ml conical flask; adding deionized water into a conical flask, and dispersing fly ash powder by ultrasonic waves to obtain fly ash dispersion liquid; adding lanthanum chloride solid particles into the fly ash dispersion liquid, preparing a lanthanum chloride solution with the concentration of 1.5mol/L, putting a rotor into a magnetic stirrer, rotationally stirring at the rotating speed of 25 ℃ and 250r/min for 10 hours, sealing a conical flask by using a preservative film, transferring the conical flask into a water bath oscillation box, setting the oscillation strength of 180r at 25 ℃, oscillating for 24 hours, washing supernate to be neutral by using deionized water, and drying to obtain the lanthanum modified fly ash.
8. The method for preparing the modified fly ash material for in-situ endogenous pollution control of the water body according to any one of claims 4 to 7, wherein the step 2 is specifically as follows: the preparation method comprises the steps of placing lanthanum modified fly ash powder and montmorillonite into a grinder to be ground, then sieving the ground materials with a 200-mesh sieve to obtain raw materials with the same particle size, respectively weighing the lanthanum modified fly ash powder and the montmorillonite with the mass proportion of 7/3, adding deionized water to mix after stirring the materials till the materials are fully mixed, adding 1-3% of sodium silicate to fully mix till the materials are in a viscous state, and then adding polyester adhesive to prepare the viscous material.
9. The method for preparing the modified fly ash material for in-situ endogenous pollution control of the water body according to claim 8, wherein the step 3 is specifically as follows: and (3) twisting the prepared fly ash mixed sticky matter into a long strip, preparing a cylindrical long strip with the diameter of 3-11mm according to the standard particle size, and performing compression molding on the pasty raw material by a pill making machine according to a pill making mold with the diameter of 3-11mm to prepare a fly ash material green body with the particle size of 3-11 mm.
10. The use of the modified fly ash material for in-situ endogenous pollution control of a water body according to any one of claims 1 to 3, in the control of endogenous phosphorus pollution of a water body.
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| CN101890335A (en) * | 2010-07-20 | 2010-11-24 | 中国科学院水生生物研究所 | Adsorbent for removing earthy and musty odor from water and preparation method |
| CN111097373A (en) * | 2018-10-25 | 2020-05-05 | 中国科学院生态环境研究中心 | Porous adsorption material, oxygen-carrying and adsorption composite functional material and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101890335A (en) * | 2010-07-20 | 2010-11-24 | 中国科学院水生生物研究所 | Adsorbent for removing earthy and musty odor from water and preparation method |
| CN111097373A (en) * | 2018-10-25 | 2020-05-05 | 中国科学院生态环境研究中心 | Porous adsorption material, oxygen-carrying and adsorption composite functional material and application thereof |
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