CN108328677B - Multifunctional environment-friendly composite material and preparation method and application thereof - Google Patents
Multifunctional environment-friendly composite material and preparation method and application thereof Download PDFInfo
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- CN108328677B CN108328677B CN201810191467.7A CN201810191467A CN108328677B CN 108328677 B CN108328677 B CN 108328677B CN 201810191467 A CN201810191467 A CN 201810191467A CN 108328677 B CN108328677 B CN 108328677B
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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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
Abstract
The invention discloses a multifunctional environment-friendly composite material and a preparation method and application thereof, wherein the composite material is mainly prepared by mixing modified activated carbon, a slow release agent and a complexing agent according to the mass ratio of 4-2:3-2:1, wherein the modified activated carbon is prepared by treating activated carbon with iron ions and strong acid according to the mass ratio of 0.2-1.0; the slow release agent is prepared by mixing calcium peroxide and 2-hydroxybenzyl aniline according to a mass ratio of 60-40: 1 to form a solid phase, and then the solid phase and the liquid phase biological flocculant are formed according to the solid-liquid mass ratio of 1: 15-20. The composite material has good treatment effect and high efficiency, and importantly, the material is eco-friendly, the composition of the material on one hand is environment-friendly and biodegradable, the pollution to the environment is reduced to a great extent, and on the other hand, the water body is comprehensively treated, so that the secondary pollution risk of the water quality is reduced.
Description
Technical Field
The invention belongs to the technical field of environment application materials, and particularly relates to a multifunctional environment-friendly composite material and a preparation method and application thereof.
Background
Urban water is an important storage reservoir and an important water circulation way of fresh water resources. In recent years, due to rapid development of economy and construction, a large amount of domestic sewage and even industrial wastewater are directly discharged into town water without treatment, the town water is seriously polluted, and the phenomenon of black and odorous water is more and more serious.
At present, the repair technology of black and odorous water is mainly artificial reoxygenation, calcium peroxide can generate a large amount of oxygen in the presence of water and has the advantages of simple operation, environmental friendliness, high oxygen release efficiency, low price and the like, and the calcium peroxide is dissolved in water and then is in a catalyst (Fe)2+、Fe3+Etc.) can react to generate OH and OH-under the existence condition, the strong oxidizing property of OH can promote the decomposition of organic pollutants which are difficult to degrade, simultaneously the oxygen release amount of calcium peroxide increases the dissolved oxygen of water,effectively controlling the eutrophication of the water body and the pollution of nitrogen, phosphorus and sulfur. Adding dissolved oxygen in water to reduce pH value, and adding catalyst (Fe)2+、Fe3+And the like) effectively promotes the effective remediation of the heavy metals in the water body and the bottom mud. Thus, calcium peroxide is associated with the catalyst (Fe)2+、Fe3+Etc.) is an effective way to treat black and odorous water bodies. However, calcium peroxide has strong oxidizing property and is easy to cause the pH value of a water body to greatly rise, so that the calcium peroxide has an inhibiting effect on microorganisms; in addition, calcium peroxide reacts very quickly when meeting water, and the too fast decomposition rate causes a great amount of instantaneous oxygen release, resulting in the problems of low oxygen utilization rate, short oxygen release duration, poor oxygen release effect and the like. At present, the sustained-release oxygen-releasing agent is mainly prepared by an embedding and fixing method and mainly comprises two forms: and (4) uniformly mixing embedding and capsule wrapping. Among them, the capsule type immobilization method is that since the object is enclosed in the embedding agent, the object is exposed to the environment and reacts rapidly once the embedding agent is dissolved. The immobilization mode of uniform mixing and embedding can control the release rate of the target object by selecting the concentration of the embedding agent and the filler, but increases the defects of engineering construction, medicine consumption, progress delay and the like to a certain extent. In order to improve the water treatment technology and improve the treatment effect of the black and odorous water body, a new multifunctional environment-friendly composite material is urgently needed to treat water pollution.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides a multifunctional environment-friendly composite material, which realizes the efficient removal of pollutants in water through the actions of adsorption, flocculation, oxidation, complexation and the like, effectively passivates heavy metals in bottom sediment, reduces the risk of secondary pollution of water quality, has higher treatment effect and efficiency than common materials, and is ecologically friendly.
The technical scheme is as follows: in order to achieve the purpose, the multifunctional environment-friendly composite material is mainly prepared by mixing modified activated carbon (GC), a slow release agent (GO) and a complexing agent according to a mass ratio of (4-2): 3-2):1, wherein the modified activated carbon is prepared from iron ions and activated carbon treated by strong acid according to a mass ratio of 0.2-1.0; the sustained release agent is prepared by mixing calcium peroxide and 2-hydroxybenzyl aniline according to a mass ratio of (60-40): 1 to form a solid phase, and then the solid phase and the liquid phase biological flocculant are formed according to the solid-liquid mass ratio of 1 (15-20).
Wherein the strong acid is hydrochloric acid, nitric acid or sulfuric acid, the concentration of the acid is 1mol/L, and the ratio of the activated carbon to the acid is 1:10-15 g/mL.
The iron ions exist in the forms of ferrous sulfate, ferric chloride or ferric nitrate, and the mass ratio of iron to activated carbon is 0.2-1.0.
The complexing agent is a biodegradable complexing agent EDDS.
The liquid-phase biological flocculant is a biological flocculant aqueous solution with the mass concentration of 0.01-1%. The liquid phase biological flocculant is a special high molecular metabolite which is produced by microorganisms and can lead solid suspended particles which are not easy to degrade in liquid to be coagulated and precipitated, the non-ionic biological flocculant takes cane sugar as raw material, and the organic high molecular polymer is finally formed by enzymatic synthesis and fractional purification under the catalysis of microbial extracellular enzyme extracted by bioengineering,
the preparation method of the multifunctional environment-friendly composite material comprises the following steps:
(1) active carbon pretreatment: taking the activated carbon, washing the activated carbon by deionized water, ultrasonically cleaning the activated carbon, repeatedly changing water, boiling the activated carbon until the water is clean, and drying the activated carbon until the weight of the activated carbon is constant to obtain pretreated activated carbon which is stored in a sealed manner for later use;
(2) modification of activated carbon: taking the pretreated activated carbon in the step (1), adding a strong acid solution, soaking for 1-2h, filtering, washing with deionized water to be neutral, and drying at 70-80 ℃ to constant weight;
(3) adding iron ion solution into the activated carbon after acid treatment, soaking for 1-2h, filtering, washing with deionized water until no iron ion exists in the filtrate, drying to constant weight to obtain modified activated carbon, and sealing for storage;
(4) preparing calcium peroxide and 2-hydroxybenzyl aniline into powder, mixing and stirring uniformly at normal temperature in proportion to obtain a solid phase component, and embedding a liquid phase biological flocculant in proportion on the solid phase through a solid-liquid two-phase spraying device to form a slow release agent;
(5) and extruding the modified active carbon, the slow release agent and the complexing agent into particles by a mold according to a certain proportion, and drying in vacuum to constant weight to obtain the composite material.
Wherein, the ultrasonic cleaning in the step (1) is carried out for 20-30min, and the drying temperature is 105-110 ℃.
In the step (2), 1g of activated carbon is usually adopted to correspond to 10mL of acid, the acid concentration is 1mol/L, and the types of the acid can be hydrochloric acid, nitric acid and sulfuric acid; the concentration of iron ions is 1mol/L,
the mass ratio of the iron ions to the activated carbon after acid treatment in the step (3) is 0.2-1.0, and the type of the iron solution can be ferrous sulfate, ferric chloride, ferric nitrate and the like. The soaking time in the step (3) is 1-2h, and the drying temperature is 55-60 ℃.
Wherein, the temperature of the vacuum drying in the step (5) is not more than 40 ℃, and the size of the mould can be dh ═ 20 × 5 mm.
The multifunctional environment-friendly composite material disclosed by the invention is applied to the preparation of black and odorous water.
The multifunctional environment-friendly composite material is prepared by mixing iron modified activated carbon, a slow-release oxygen agent and EDDS, and is used in black and odorous polluted water. The combined action of adsorption, flocculation, oxidation, complexation and the like is utilized to realize the high-efficiency removal of pollutants and the effective passivation of heavy metals, thereby achieving the effect of synchronously improving the water quality and the sludge quality in the black and odorous water body. The slow-release oxygen agent prepared from the iron modified activated carbon and the calcium peroxide can form a Fenton-like system in a water body, so that on one hand, the Fenton effect is realized, and the efficient degradation of pollutants is realized; on one hand, the self weight of the activated carbon can be utilized to realize the suspension settlement of the material, so that the water pollution can be fully contacted, and meanwhile, the adsorption of the activated carbon, the flocculation of the biological flocculant and the like can also realize the partial removal of pollutants in water. In order to prevent iron ions in the system from hydrolyzing and precipitating to influence the utilization rate of the iron ions, a biodegradable complexing agent EDDS is added to realize the complexing of the iron ions, and meanwhile, the heavy metal can be effectively complexed to reduce the biotoxicity and the effective utilization of the heavy metal. The eco-friendly material is prepared from a plurality of materials by different processes, the mutual combined action of the materials is brought into play to the maximum benefit, and meanwhile, the process is flexibly used, so that the utilization rate of the materials is maximized.
Compared with the common Fenton system, the invention adopts solid calcium peroxide to replace hydrogen peroxide, and simultaneously adds a trace amount of chemical intermediate 2-hydroxybenzyl aniline to prevent the problems of low oxygen utilization rate, short oxygen release duration, poor oxygen release effect and the like caused by instant large amount of oxygen release due to the over-fast decomposition rate of the calcium peroxide, can slow down the oxygen release rate and improve the effective utilization rate of oxygen, can further improve the utilization rate of the calcium peroxide by being combined with the coating of a bioflocculant, and can buffer the pH value of the system by being combined with EDDS, thereby reducing the generation of inhibition effect on microorganisms, expanding the Fenton-like reaction conditions and utilizing the further popularization and application of materials.
Compared with the common sewage treatment material, the composite material disclosed by the invention is an eco-friendly material, the treatment effect and efficiency are higher than those of the common material, and the important thing is that the material is eco-friendly, on one hand, the environment-friendly material and the biodegradable material are formed by the material, so that the pollution to the environment is greatly reduced, on the other hand, the water body is comprehensively treated, the risk of secondary pollution of water quality is reduced, and meanwhile, the ecological dredging resource utilization of subsequent bottom mud is facilitated.
All reagents of the present invention are commercially available, wherein activated carbon is purchased from Nanjing Tengchun Biotech development, Inc.; the biological flocculant is purchased from Hengbang biological environmental protection Co.Ltd of Nanjing; EDDS was purchased from bio-coul bioengineering, ltd, anhui.
Has the advantages that: compared with the prior art, the invention has the following effects:
1. compared with the effect of the slow release agent prepared by the traditional embedding method for water treatment, the multifunctional environment-friendly composite material prepared by the invention has the advantages that the oxygen release amount and the slow release time are both larger than those of the traditional sewage treatment agent, composite material or slow release agent and the like, and meanwhile, the composite material subjected to compression molding is more favorable for delaying the release of oxygen, improving the utilization rate of calcium peroxide, slowing down the great change of pH and being favorable for the implementation of ecological activities of a water body.
2. The multifunctional environment-friendly composite material prepared by the invention is used for water treatment aiming at the characteristics of various pollution of black and odorous water bodies, the removal effect of pollutants is greatly improved by combining the modified activated carbon, the slow release agent and the complexing agent, particularly the removal of nitrogen, phosphorus and heavy metals and the like, a good water quality restoration effect is achieved, and the effect is generally higher than that of common water treatment agents in the market; the environment-friendly calcium peroxide is used while adding a trace amount of chemical intermediate 2-hydroxybenzyl aniline, and then is embedded by biodegradable biopolymer such as bioflocculant, and is simultaneously used by modified activated carbon rich in iron ions, so that the environment treatment effect is achieved, and more importantly, the harm to the environment is relieved.
3. The preparation method of the multifunctional environment-friendly composite material is simple and convenient, a solid-liquid two-phase spraying device is selected for preparation, the embedding and uniformly mixing effects of the sustained-release agent are ensured, the advantages of saving medicines and the like exist, and the combination of the modified activated carbon, the sustained-release agent and the complexing agent can be widely applied to industrial production.
Detailed Description
The present invention is further illustrated by the following examples.
Example 1
(1) Active carbon pretreatment: washing 20g of activated carbon with deionized water, ultrasonically cleaning for 30min, boiling with an electric furnace, repeatedly changing water and boiling until the water is completely removed, then placing into an oven, drying at 110 ℃ to constant weight to obtain pretreated activated carbon, and storing in a sealed bag for later use;
(2) modification of activated carbon: taking the pretreated activated carbon with the mass fraction of 80% in the step (1), adding 160mL of 1mol/L hydrochloric acid, soaking for 1h, filtering, washing with deionized water to be neutral, and drying at 80 ℃ to constant weight to obtain the activated carbon after acid treatment;
(3) taking 80% of the activated carbon subjected to acid treatment in the step (2), adding 1mol/L ferric chloride solution with the mass ratio of iron ions to the activated carbon subjected to acid treatment being 0.5, soaking for 1h, filtering, washing with deionized water until filtrate has no iron ions, drying at 60 ℃ to constant weight to obtain modified activated carbon, and storing in a vacuum sealing bag for later use;
(4) preparing calcium peroxide and 2-hydroxybenzyl aniline into powder, mixing and stirring uniformly at normal temperature according to the mass ratio of 50:1 to obtain a solid phase component, and embedding the solid phase into a slow release agent by a biological flocculant aqueous solution with the liquid phase component of 0.01% (m/m) according to the solid-liquid mass ratio of 1:15 through a solid-liquid two-phase spraying device (patent No. 201320694656.9);
(5) filling the modified activated carbon, the sustained-release agent and the complexing agent into a mold according to the mass ratio of 2:2:1, extruding the modified activated carbon, the sustained-release agent and the complexing agent into particles by the mold, and drying the particles in vacuum at 40 ℃ until the weight is constant to obtain the composite material.
Example 2
(1) Active carbon pretreatment: washing 20g of activated carbon with deionized water, ultrasonically cleaning for 20min, boiling with an electric furnace, repeatedly changing water and boiling until the water is completely removed, then placing into an oven, drying at 105 ℃ to constant weight to obtain pretreated activated carbon, and storing in a sealed bag for later use;
(2) modification of activated carbon: taking the pretreated activated carbon with the mass fraction of 90% in the step (1), adding 180mL of 1mol/L sulfuric acid, soaking for 2h, filtering, washing with deionized water to be neutral, and drying at 70 ℃ to constant weight to obtain the activated carbon after acid treatment;
(3) taking 80% of the activated carbon subjected to acid treatment in the step (2), adding 1mol/L ferric chloride solution with the mass ratio of iron ions to the activated carbon subjected to acid treatment being 1.0, soaking for 2h, filtering, washing with deionized water until filtrate has no iron ions, drying at 55 ℃ to constant weight to obtain modified activated carbon, and storing in a vacuum sealing bag for later use;
(4) preparing calcium peroxide and 2-hydroxybenzyl aniline into powder, uniformly mixing and stirring the powder at normal temperature according to the mass ratio of 60:1 to obtain a solid phase component, and embedding the solid phase into a slow release agent by a biological flocculant aqueous solution with the liquid phase component of 0.01% (m/m) according to the solid-liquid mass ratio of 1:20 through a solid-liquid two-phase spraying device (patent No. 201320694656.9);
(5) filling the modified activated carbon, the sustained-release agent and the complexing agent into a mold according to the mass ratio of 4:3:1, extruding the modified activated carbon, the sustained-release agent and the complexing agent into particles by the mold, and drying the particles in vacuum at 40 ℃ until the weight is constant to obtain the composite material.
Example 3
(1) Active carbon pretreatment: washing 20g of activated carbon with deionized water, ultrasonically cleaning for 30min, boiling with an electric furnace, repeatedly changing water and boiling until the water is completely removed, then placing into an oven, drying at 110 ℃ to constant weight to obtain pretreated activated carbon, and storing in a sealed bag for later use;
(2) modification of activated carbon: taking the pretreated activated carbon with the mass fraction of 85% in the step (1), adding 170mL of 1mol/L hydrochloric acid, soaking for 2h, filtering, washing with deionized water to be neutral, and drying at 80 ℃ to constant weight to obtain acid-treated activated carbon; ,
(3) taking 85% of activated carbon subjected to acid treatment in the step (2), adding 1mol/L ferric chloride solution with the mass ratio of iron ions to the activated carbon subjected to acid treatment being 0.2, soaking for 2h, filtering, washing with deionized water until filtrate has no iron ions, drying at 55 ℃ to constant weight to obtain modified activated carbon, and storing in a vacuum sealing bag for later use;
(4) preparing calcium peroxide and 2-hydroxybenzyl aniline into powder, uniformly mixing and stirring the powder at normal temperature according to the mass ratio of 40:1 to obtain a solid phase component, and embedding the solid phase into a slow release agent by a biological flocculant aqueous solution with the liquid phase component being 1% (m/m) according to the solid-liquid mass ratio of 1:18 through a solid-liquid two-phase spraying device (patent No. 201320694656.9);
(5) filling the modified activated carbon, the sustained-release agent and the complexing agent into a mold according to the mass ratio of 2:2:1, extruding the modified activated carbon, the sustained-release agent and the complexing agent into particles by the mold, and drying the particles in vacuum at 35 ℃ until the weight is constant to obtain the composite material.
Example 4
The composites prepared in examples 1 and 2 were mixed as described in 2: the water content of the raw sewage is respectively added into a certain polluted black and odorous water body with the water content of 80 percent at a ratio of 1g/L, the content of each pollution source in the raw sewage is shown in tables 1 and 2, and the measured result of the reaction time of 7d is as follows:
wherein, the comparative example 1 is a commercial material, in particular a fenton reagent of a combination of ferrous iron and hydrogen peroxide; the procedure and amount of the reaction for treating wastewater were the same as in examples 1 and 2.
Comparative example 2 the same starting material and preparation as in example 1 was used, except that 2-hydroxybenzylaniline was not added in step (4); the procedure and amount of the reaction for treating wastewater were the same as in examples 1 and 2.
Comparative example 3 the same feedstock and preparation as in example 1, except that no liquid phase bioflocculant was added in step (4); the procedure and amount of the reaction for treating wastewater were the same as in examples 1 and 2.
Comparative example 4 the same starting material and preparation as in example 2, except that no 2-hydroxybenzylaniline was added in step (4); the procedure and amount of the reaction for treating wastewater were the same as in examples 1 and 2.
Comparative example 5 the same raw material and preparation method as in example 2, except that no liquid phase bioflocculant was added in step (4); the procedure and amount of the reaction for treating wastewater were the same as in examples 1 and 2.
Table 1 comparison of experimental results of black and odorous water pretreatment of composite material prepared in example 1 with comparative material
Table 2 comparison of experimental results of black and odorous water pretreatment of composite material prepared in example 2 with comparative material
The results in tables 1 and 2 show that the environment-friendly composite material has better treatment effect on water quality than comparative examples 1-3, and compared with the comparative examples, the environment-friendly composite material has the advantages that various pollution indexes in the water quality are obviously reduced, heavy metals in water are migrated and stabilized in bottom mud, and secondary pollution of the water quality is reduced.
Meanwhile, the comparison of the data in tables 1 and 2 shows that the composite material of the invention can cause a large amount of oxygen release due to no addition of 2-hydroxybenzyl aniline, which results in low oxygen utilization rate, short oxygen release duration and poor oxygen release effect; the pH value is greatly increased without adding the biological flocculant, so that the biological flocculant has an inhibiting effect on microorganisms, and the addition of the biological high molecular polymer has a great improvement effect on the treatment effect.
Claims (7)
1. The multifunctional environment-friendly composite material is characterized by mainly comprising modified activated carbon, a slow release agent and a complexing agent in a mass ratio of (4-2): (3-2):1, the modified activated carbon is prepared by mixing ferric ions and acid, the acid is hydrochloric acid, nitric acid or sulfuric acid, the concentration of the acid is 1mol/L, the ratio of the activated carbon to the acid is 1:10-15g/mL, the ferric ions exist in the forms of ferrous sulfate, ferric chloride or ferric nitrate, and the mass ratio of the ferric ions to the activated carbon is 0.2-1.0; the sustained release agent is prepared by mixing calcium peroxide and 2-hydroxybenzyl aniline according to a mass ratio of (60-40): 1 to form a solid phase, and then mixing the solid phase with a liquid phase biological flocculant according to a solid-liquid mass ratio of 1: (15-20), wherein the complexing agent is a biodegradable complexing agent EDDS.
2. The multifunctional environment-friendly composite material according to claim 1, wherein the liquid-phase bioflocculant is an aqueous bioflocculant solution having a mass concentration of 0.01-1%.
3. A method for preparing the multifunctional environment-friendly composite material as claimed in claim 1, characterized by comprising the steps of:
(1) active carbon pretreatment: taking the activated carbon, washing the activated carbon by deionized water, ultrasonically cleaning the activated carbon, repeatedly changing water, boiling the activated carbon until the water is clean, and drying the activated carbon until the weight of the activated carbon is constant to obtain pretreated activated carbon which is stored in a sealed manner for later use;
(2) modification of activated carbon: taking the pretreated activated carbon in the step (1), adding a strong acid solution, soaking for 1-2h, filtering, washing with deionized water to be neutral, and drying at 70-80 ℃ to constant weight to obtain acid-treated activated carbon;
(3) adding iron ion solution into the activated carbon after acid treatment, soaking for 1-2h, filtering, washing with deionized water until no iron ion exists in the filtrate, drying to constant weight to obtain modified activated carbon, and sealing for storage;
(4) preparing calcium peroxide and 2-hydroxybenzyl aniline into powder, mixing and stirring uniformly at normal temperature in proportion to obtain a solid phase component, and embedding a liquid phase biological flocculant in proportion on the solid phase through a solid-liquid two-phase spraying device to form a slow release agent;
(5) and extruding the modified active carbon, the slow release agent and the complexing agent into particles by a mold according to a certain proportion, and drying in vacuum to constant weight to obtain the composite material.
4. The method as claimed in claim 3, wherein the ultrasonic cleaning in step (1) is performed for 20-30min at a drying temperature of 105-110 ℃.
5. The method according to claim 3, wherein the drying temperature in the step (3) is 55 to 60 ℃.
6. The method according to claim 3, wherein the temperature of the vacuum drying in the step (4) is not more than 40 ℃.
7. The application of the multifunctional environment-friendly composite material as claimed in claim 1 in comprehensive treatment of black and odorous water.
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| CN110615518B (en) * | 2019-05-07 | 2022-05-24 | 中冶华天工程技术有限公司 | Fenton reaction ferrous iron slow release granule |
| CN111943251B (en) * | 2020-08-20 | 2021-07-02 | 苏州维格纳信息科技有限公司 | Method for preparing cuprous oxide by using waste copper-tungsten alloy as raw material |
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