CN107570214B - Preparation method of paper-based bismuth ferrite composite material with multiphase adsorption catalysis function - Google Patents
Preparation method of paper-based bismuth ferrite composite material with multiphase adsorption catalysis function Download PDFInfo
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Abstract
The invention provides a preparation method of a paper-based bismuth ferrite composite material with a multiphase adsorption catalysis function. The method comprises the following steps: 1. preparing bismuth ferrite (BiFeO) by adopting a hydrothermal method or a sol-gel method3) A nanoparticle; 2. preparing a plant fiber suspension; 3. preparing bismuth ferrite (BiFeO) by adopting a hydrothermal method or a sol-gel method3) A paper-based composite. The invention takes the interweaved layer of the plant fiber as a carrier, and the nano bismuth ferrite particles are uniformly dispersed and loaded on the carrier, so that the agglomeration of the bismuth ferrite nano particles can be avoided, thereby ensuring the adsorption and catalytic activity; the invention utilizes the strong adsorption and catalytic performance of the catalyst to realize the high-efficiency degradation and mineralization of organic pollutants.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a preparation method of a paper-based bismuth ferrite composite material with a multiphase adsorption catalysis function.
Background
China is a country lacking in water resources, and water resources are polluted seriously, so that the water resources face a more severe situation. In the wastewater discharged by industrial enterprises, the existence of persistent organic pollutants has a great influence on the water environment, so that the advanced treatment of the organic pollutants in the industrial wastewater to achieve the standard discharge and even the reuse of the organic pollutants is an urgent task at present.
Conventional organic contaminant removal techniques include physical methods, microbial and enzymatic treatment techniques, and the like. The physical method mainly separates pollutants from water by means of filtration, adsorption and the like and transfers the pollutants to other media, and practically does not realize complete degradation and mineralization of organic pollutants in the environment. The biological treatment technology is mainly represented by microorganism and enzyme treatment technology, and the method is mainly suitable for effectively treating pollutants with low toxicity or concentration, has limited treatment effect on organic matters with high toxicity, has overlong treatment period, and has the problems of microorganism poisoning or enzyme inactivation even in the treatment process, so that the practical application of the method is limited.
With the continuous development of water treatment technology, people find that H can be effectively activated by using oxidant, electricity, light, catalyst and the like2O2And O2And the like, thereby generating a radical (mainly. OH) having a very strong activity in the reaction. Wherein the standard oxidation-reduction potential of OH is 2.8V, the catalyst has strong oxidation capacity, and when the catalyst acts with organic pollutants, the catalyst can oxidize and degrade refractory macromolecular organic matters into low-toxicity or non-toxic micromolecules through the actions of addition, substitution, electron transfer, bond breaking, ring opening and the like, and even directly decompose into CO2And H2And O, achieving the purpose of harmless treatment, namely the advanced oxidation technology. The advanced oxidation technology mainly comprises Fenton or Fenon-like oxidation technology (Masombon N, Ratanamaskul C, Lu MC, chemical oxidation of 2, 6-dimethyllanine in the Fenton process, environ Sci, Techno. 2009,43: 8269-8634; Feng J Y, Hu X J, Yue P L, Disoloration and catalysis of orange II using a photocatalytic oxidation of Fe: a synergistic oxidation of Environ Sci. Techno. 2004,38: 5773-5778), and photocatalytic oxidation technology (Linsebigger A, Lu G, Yates J. photocatalytic TiO. photocatalyst2surface, printers, and selected results, chem.Rev.1995,95: 735-; wang N, Chen Z F, Zhu L, et al. synthetic effects of clinical and fluoride ions on Photocatalytic degradation of phenol. J. Photochem. Photobiol. A. chem.2007,191:193-200.), ultrasonic radiation oxidation technique (Chrodysury P, Viraghavan T. Sonochemicaldegradation of chlorinated organic compounds, phenolic compounds and organic dyes-A review. Sci. Total environ.2009,407:2474-3/H2O2advanced oxidation process. Chemosphere 2010,78: 517-526), and the like. The Fenton oxidation method comprises a homogeneous Fenton reaction and a multiphase Fenton reaction, wherein a catalyst, an oxidant and pollutants are in the same phase in the homogeneous Fenton reaction, but precipitates are easy to generate in the reaction process, and more manpower and material resources are needed for processing the precipitates, so that the reaction has higher requirement on the pH value. The heterogeneous Fenton reaction has catalyst and other reactant not in the same phase, and this overcomes the demerits of homogeneous Fenton reaction, but research shows that this kind of reaction has catalytically activated H2O2The efficiency of (a) needs to be further improved. The photocatalytic technology mainly utilizes ultraviolet light or visible light to catalyze and generate photoproduction electrons and holes, utilizes the reduction or oxidation of the photoproduction electrons or the holes to degrade pollutants, but the problem of low efficiency still exists when a photocatalytic method is only adopted to treat more stable pollutants. The research of the ultrasonic radiation technology on the aspect of treating pollutants has been advanced to a certain extent, but additional equipment is needed for generating energy, the cost is high, and the utilization efficiency of the energy is not high. The application of ozone oxidation technology in the treatment of pollutants is also increasingly gaining attention, but the cost of ozone generation is high, and the problem of subsequent pollution of excess ozone is to be solved.
With the continuous development of advanced oxidation technology, the development of photo-Fenton catalytic technology is receiving increasing attention. The technology combines the photocatalytic reaction and the chemical catalytic reaction, greatly improves the reaction efficiency by utilizing the advantages of the photocatalytic reaction and the chemical catalytic reaction, and has the advantages of mild condition, strong oxidation capacity and wide application range, so that the method for treating the refractory toxic organic pollutants becomes a hot spot of domestic and foreign research. The key to the success of the catalytic system in removing organic pollutants is the selection of a catalyst having photocatalytic and heterogeneous fenton catalytic properties. The perovskite type nano bismuth ferrite has the characteristics of good chemical stability, strong Fenton-like catalytic capability, certain photocatalytic capability, safety, no toxicity and the like, and in addition, the substance also has certain magnetism, so that the substance is convenient to recycle, and the application of the substance in the aspect of catalytic degradation of organic pollutants is increasingly concerned by people. However, researchers still find many problems in the use process of bismuth ferrite, and bismuth ferrite is in a nanometer size, so that the bismuth ferrite is easy to agglomerate in the use process, the particle size is increased, the catalytic efficiency and the degradation effect are reduced, and the adsorption capacity of the bismuth ferrite is further improved. Therefore, people use carriers such as graphene to prepare the composite bismuth ferrite catalyst, and a certain effect improvement effect is achieved. However, the prior art has the problems of high carrier cost and unsatisfactory effect. Therefore, the problem to be solved is to select a carrier which is low in cost and can obviously improve the adsorption and catalytic performances of the bismuth ferrite composite catalyst to prepare a high-efficiency multifunctional material with higher adsorption and visible light-fenton-like catalytic performances.
The invention content is as follows:
the invention aims to provide a preparation method of a paper-based bismuth ferrite composite material with a multiphase adsorption catalysis function.
The design idea of the invention is as follows: firstly, a hydrothermal method or a sol-gel method is adopted to prepare the perovskite bismuth ferrite of the high-activity heterogeneous Fenton-like catalyst with visible light catalytic performance, and the nano-particle size of the perovskite bismuth ferrite enables the perovskite bismuth ferrite to have higher specific surface area and adsorption performance due to the capability of reacting with H2O2Sufficient contact results in higher catalytic activity. On the basis, the bismuth ferrite paper-based composite material is compounded with plant fibers by adopting a rapid kaiser forming method, so that the bismuth ferrite paper-based composite material is prepared. In the process, Polyethyleneimine (PEI) is used as a retention aid to improve the binding effect between the bismuth ferrite catalyst and the plant fiber; the polyethyleneimine is used as a wet strength agent to improve the strength of the composite material in a water body, so that the bismuth ferrite can stably exist in the composite material (as shown in figure 1).
In order to achieve the purpose, the technical scheme of the invention is as follows:
a preparation method of a paper-based bismuth ferrite composite material with a multiphase adsorption catalysis function comprises the following steps:
1. preparing bismuth ferrite (BiFeO) by adopting a hydrothermal method or a sol-gel method3) Nano-particles:
A. preparing bismuth ferrite (BiFeO) by hydrothermal method3) Nano-particles:
bismuth ferrite (BiFeO)3) Preparing nano particles: weighing 30-50mL of distilled water, placing the distilled water in a container, adding 10-15mL of nitric acid solution with the mass fraction of 68% for dilution, weighing 0.005-0.006mol of bismuth nitrate and 0.005-0.006mol of ferric nitrate, pouring the mixture into the diluted nitric acid solution, stirring and dissolving to obtain a mixed solution, weighing 33-40g of potassium hydroxide, adding water for dissolving, transferring the mixed solution into a 50mL volumetric flask for constant volume, adding the prepared potassium hydroxide solution into the mixed solution, continuously stirring to generate brown precipitate in the solution, filtering the solution by using a conical funnel to obtain brown precipitate, washing the brown precipitate for 5-8 times by using distilled water, adding the precipitate into 40-45mL of potassium hydroxide solution, uniformly stirring, pouring the obtained suspension into a 50mL stainless steel reaction kettle, placing the stainless steel reaction kettle in a muffle furnace for reaction at 200 ℃ for 10-12 hours, naturally cooling to room temperature, taking out, filtering the obtained solution, washing with distilled water for 4-6 times, and drying in an oven at 70-80 deg.C for 4-6 hr to obtain bismuth ferrite (BiFeO)3) Preparing a nano particle finished product;
B. preparing bismuth ferrite (BiFeO) by adopting sol-gel method3) Nano-particles:
dissolving 0.005-0.006mol of ferric nitrate and 0.005-0.006mol of bismuth nitrate in 20-30mL of ethylene glycol monomethyl ether, adding 20-25 mu L of 0.1mol/L nitric acid solution, adding 0.008-0.01mol of citric acid and 10-15mL of ethylene glycol, stirring the mixture at 60-70 ℃ for 1-2 hours to form sol, heating the sol at 100-120 ℃ for 5-6 hours to form brown gel, placing the brown gel on an electric furnace, heating at 100-120 ℃ for 30-40 minutes, then calcining at 500-600 ℃ in a muffle furnace for 2-3 hours, cooling to room temperature, and then cooling the bismuth ferrite (BiFeO)3) Grinding the product for later use;
2. preparing a plant fiber suspension: weighing 300-400g of needle-leaved wood pulp board, soaking in 8-10L of water for 30-40 minutes, shredding into small pulp sheets of 3cm multiplied by 3cm, adding 10-12L of water into a pulp groove of a groove type pulping machine, starting the pulping machine, slowly adding the small pulp sheets for pulping, stopping pulping when the pulping degree reaches 40-60 DEG SR, taking out pulp, squeezing out water, placing in a sealed bag to balance the water, and finally measuring the water content of paper pulp;
3. preparing bismuth ferrite (BiFeO) by adopting a hydrothermal method or a sol-gel method3) Paper-based composite material:
adding 2-6g of paper pulp of the oven dry pulp into deionized water, stirring to obtain a dispersion liquid, then adding 0-6g of bismuth ferrite into the dispersion liquid, stirring to obtain a well-dispersed dispersion liquid, copying the obtained dispersion liquid by adopting a rapid Kaiser method, and drying to obtain the bismuth ferrite paper-based composite material.
The method prepares bismuth ferrite (BiFeO) by a hydrothermal method or a sol-gel method3) When the nano-particles are used, Bi (NO) is used3)3And Fe (NO)3)3Is used as a raw material.
The pulp suspension in the method is prepared by a mechanical beating method.
The bismuth ferrite paper-based composite material in the method is prepared by adopting a rapid kaiser forming method.
According to the method, when the composite material is prepared by using a rapid kaiser forming method, PEI is used as a retention aid, and PAE is used as a wet strength agent, so that bismuth ferrite stably exists in the composite material.
Compared with the prior art, the invention has the following positive effects:
1. the invention takes the interweaving layer of the plant fiber as a carrier, and the nano bismuth ferrite particles are uniformly dispersed and loaded on the carrier, so that the agglomeration of the bismuth ferrite nano particles can be avoided, and the adsorption and catalytic activity are ensured;
2. the plant fiber used in the invention belongs to a porous material, has super strong adsorption performance, and can generate good catalytic degradation effect inevitably due to strong adsorption;
3. the plant fiber used in the invention has a structure more than micron, the size of the interweaving layer is larger, and the plant fiber and bismuth ferrite nano particles can form a micro-nano two-dimensional structure, so that the material has good adsorption and catalysis effects, and the catalytic material is convenient to recover and recycle;
4. the PEI and the PAE which are used as the retention aid and the wet strength agent are respectively used, so that the composite effect of the bismuth ferrite and the plant fiber is ensured, and meanwhile, the material has enough wet strength, can stably exist in a water body and is convenient to use again;
5. the invention utilizes the strong adsorption and catalytic performance of the catalyst to realize the high-efficiency degradation and mineralization of organic pollutants.
Drawings
FIG. 1 is a schematic diagram of the synthesis of a bismuth ferrite paper-based composite material;
FIG. 2 is an external macro topography diagram of the bismuth ferrite paper-based composite material;
FIG. 3 is a graph showing the change in the amount of Congo red adsorbed by bismuth ferrite paper-based composites (prepared by hydrothermal method) with different bismuth ferrite contents (adsorption conditions: pH 5, temperature: 25 ℃);
FIG. 4 shows the degradation kinetics of Congo red by bismuth ferrite paper-based composite materials (prepared by hydrothermal method) with different bismuth ferrite contents (BiFeO)3The mass content of (A): (1)0, (2) 10%, (3) 20%, (4) 30%, (5) 40%, (6) 50%, pH 5, temperature: 25 ℃);
FIG. 5 is a graph showing the change in the amount of adsorption of Congo red by bismuth ferrite paper-based composite materials (prepared by a sol-gel method) having different bismuth ferrite contents (adsorption conditions: pH 5, temperature: 25 ℃);
FIG. 6 shows the degradation kinetics of Congo red by bismuth ferrite paper-based composite materials (prepared by sol-gel method) with different bismuth ferrite contents (BiFeO)3The mass content of (A): (1) 10%, (2) 20%, (3) 30%, (4) 40%, (5) 50%, pH 5, temperature: at 25 deg.C).
Detailed Description
The technical solution of the present invention will be further clearly and completely described below with reference to the accompanying drawings and examples.
The specific implementation process for preparing the bismuth ferrite paper-based composite material by using the technical scheme of the invention is divided into nano bismuth ferrite (BiFeO)3) The preparation of the plant fiber suspension and the preparation of the bismuth ferrite paper-based composite material are carried out according to three main stepsThe adsorption and degradation effects of the prepared material on organic pollutants correspondingly adjust the preparation process.
The first embodiment is as follows:
preparing bismuth ferrite (BiFeO) by hydrothermal method3) Paper-based composite material
1. Preparing bismuth ferrite (BiFeO) by hydrothermal method3) Nanoparticles
Firstly, weighing 30-50mL of distilled water, placing the distilled water in a container, and adding 10-15mL of nitric acid (mass fraction 68%) for dilution; then 0.005-0.006mol of bismuth nitrate and 0.005-0.006mol of ferric nitrate are weighed and poured into the diluted nitric acid to be stirred and dissolved to prepare mixed liquid; then weighing 33-40g of potassium hydroxide by using a container, adding water to dissolve the potassium hydroxide, and transferring the potassium hydroxide into a 50mL volumetric flask to fix the volume; adding the prepared potassium hydroxide (KOH) solution into the mixed solution, and continuously stirring to generate brown precipitates; filtering the solution with a cone funnel to obtain brown precipitate, and washing with distilled water for 5-8 times; then adding the precipitate into 40-45mL of potassium hydroxide (KOH) solution and uniformly stirring; pouring the obtained suspension into a 50mL stainless steel reaction kettle, placing the stainless steel reaction kettle in a muffle furnace for reaction at 200 ℃ for 10-12 hours, and taking out the suspension after naturally cooling to room temperature; filtering the obtained solution, washing with distilled water for 4-6 times, and drying in an oven at 70-80 deg.C for 4-6 hr to obtain bismuth ferrite (BiFeO)3) And (5) finishing the nano particles.
2. Preparation of plant fiber suspensions
Firstly, weighing 300-400g of softwood pulp board, soaking the softwood pulp board in 8-10L of water for 30-40min, and shredding the softwood pulp board into small pulp pieces of 3cm multiplied by 3 cm; then adding 10-12L of water into a pulp tank of the tank type pulping machine, starting the pulping machine, and slowly adding the pulp for pulping; stopping pulping when the pulping degree reaches 40-60 DEG SR, taking out pulp, squeezing water, placing in a sealed bag to balance water, and finally measuring the water content of paper pulp.
3. Preparing bismuth ferrite (BiFeO) by hydrothermal method3) Paper-based composite material
And (3) adding 2-6g of pulp of the oven-dried pulp into deionized water, and stirring to obtain a dispersion liquid of the oven-dried pulp. Then 0-6g of bismuth ferrite is added into the dispersion liquid and stirred to obtain well-dispersed dispersion liquid, then the obtained dispersion liquid is subjected to sheet making by adopting a rapid Kaiser forming method, and the bismuth ferrite paper-based composite material (the external appearance of which is shown in figure 2) is obtained by drying.
4. Evaluation of adsorption of bismuth ferrite (hydrothermal method) paper-based composite material on organic pollutants (Congo red):
the Congo red is taken as an adsorption object, the adsorption effect of the bismuth ferrite paper-based composite material on the Congo red is researched, and the preparation process of the bismuth ferrite paper-based composite material is correspondingly adjusted according to the adsorption effect (the specific adsorption condition is shown in figure 3).
5. The degradation evaluation of the bismuth ferrite (hydrothermal method) paper-based composite material on organic pollutants (Congo red) is as follows:
the Congo red is used as a degradation object, the degradation effect of the bismuth ferrite (hydrothermal method) paper-based composite material on the Congo red is researched, and the preparation process of the bismuth ferrite (hydrothermal method) paper-based composite material is correspondingly adjusted according to the degradation effect (the specific degradation condition is shown in figure 4).
Example two:
preparing bismuth ferrite (BiFeO) by adopting sol-gel method3) Paper-based composite material
1. Preparing bismuth ferrite (BiFeO) by adopting sol-gel method3) Nanoparticles
First 0.005 to 0.006mol of ferric nitrate and 0.005 to 0.006mol of bismuth nitrate are dissolved in 20 to 30mL of ethylene glycol monomethyl ether, then 20 to 25. mu.L of a 0.1mol/L nitric acid solution is added, followed by 0.008 to 0.01mol of citric acid and 10 to 15mL of ethylene glycol, and the resulting mixture is stirred at 60 to 70 ℃ for 1 to 2 hours to form a sol. Heating the sol at the temperature of 100-120 ℃ for 5-6h to form brown gel, then placing the brown gel on an electric furnace, heating at the temperature of 100-120 ℃ for 30-40min, calcining at the temperature of 500-600 ℃ in a muffle furnace for 2-3 h, and cooling to room temperature, and grinding the obtained product for later use.
2. Preparation of plant fiber suspensions
Firstly, weighing 300-400g of softwood pulp board, soaking the softwood pulp board in 8-10L of water for 30-40min, and shredding the softwood pulp board into small pulp pieces of 3cm multiplied by 3 cm; then adding 10-12L of water into a pulp tank of the tank type pulping machine, starting the pulping machine, and slowly adding the small pulp sheets for pulping; stopping pulping when the pulping degree reaches 40-60 DEG SR, taking out pulp, squeezing water, placing in a sealed bag to balance water, and finally measuring the water content of paper pulp.
3. Preparing bismuth ferrite (BiFeO) by adopting sol-gel method3) Paper-based composite material
And (3) adding 2-6g of pulp of the oven-dried pulp into deionized water, and stirring to obtain a dispersion liquid of the oven-dried pulp. And then adding 0-6g of bismuth ferrite into the dispersion liquid, stirring to obtain well-dispersed dispersion liquid, then carrying out sheet making on the obtained dispersion liquid by adopting a rapid Kaiser forming method, and drying to obtain the bismuth ferrite paper-based composite material.
4. Evaluation of adsorption of bismuth ferrite (sol-gel method) paper-based composite material on organic pollutants (Congo red):
the Congo red is taken as an adsorption object, the adsorption effect of the bismuth ferrite paper-based composite material on the Congo red is researched, and the preparation process of the bismuth ferrite paper-based composite material is correspondingly adjusted according to the adsorption effect (the specific adsorption condition is shown in figure 5).
5. The degradation evaluation of bismuth ferrite (sol-gel method) paper-based composite material on organic pollutants (Congo red) is as follows:
the Congo red is used as a degradation object, the degradation effect of the bismuth ferrite (hydrothermal method) paper-based composite material on the Congo red is researched, and the preparation process of the bismuth ferrite (hydrothermal method) paper-based composite material is correspondingly adjusted according to the degradation effect (the specific degradation condition is shown in figure 6).
Results of example testing
1. The bismuth ferrite paper-based composite material prepared by a hydrothermal method has the best adsorption performance when the content of bismuth ferrite is 50%, and the adsorption capacity of the bismuth ferrite paper-based composite material to Congo red is 274.73 mg/g; the composite material has the best catalytic performance when the content of bismuth ferrite is 50%, and the degradation rate of the composite material to Congo red after adsorption equilibrium is about 84% (after 15 hours of reaction).
2. The bismuth ferrite paper-based composite material prepared by adopting the sol-gel method has the best adsorption performance when the content of bismuth ferrite is 50 percent, and the adsorption quantity of the bismuth ferrite paper-based composite material to Congo red is 270.71.73 mg/g; the composite material has the best catalytic performance when the content of bismuth ferrite is 50%, and the degradation rate of the composite material to Congo red after adsorption equilibrium is about 81% (after 15 hours of reaction).
All of the features disclosed in this specification, or all of the methods, steps and amounts disclosed, may be combined in any combination, except combinations where mutually exclusive features and/or steps, amounts are mutually exclusive. Any feature disclosed in this specification (including any accompanying claims and abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The above description is only a non-limiting embodiment of the invention, and many embodiments can be derived, and those skilled in the art can make several modifications and improvements without departing from the inventive concept and without making creative efforts, which all belong to the protection scope of the present invention.
Claims (2)
1. A preparation method of a paper-based bismuth ferrite composite material with a multiphase adsorption catalysis function is characterized by comprising the following steps: the method comprises the following steps:
(1) preparing bismuth ferrite nano particles by a hydrothermal method or a sol-gel method:
A. preparing bismuth ferrite nanoparticles by a hydrothermal method:
preparing bismuth ferrite nanoparticles: weighing 30-50mL of distilled water, placing the distilled water in a container, adding 10-15mL of nitric acid solution with the mass fraction of 68% for dilution, weighing 0.005-0.006mol of bismuth nitrate and 0.005-0.006mol of ferric nitrate, pouring the solution into the diluted nitric acid solution, stirring and dissolving to obtain mixed solution, weighing 33-40g of potassium hydroxide, adding water for dissolving, transferring the mixed solution into a 50mL volumetric flask for constant volume, adding the prepared potassium hydroxide solution into the mixed solution, continuously stirring to generate brown precipitate in the solution, filtering the solution by using a conical funnel to obtain brown precipitate, washing the brown precipitate for 5-8 times by using distilled water, adding the precipitate into 40-45mL of potassium hydroxide solution, uniformly stirring, pouring the obtained suspension into a 50mL of stainless steel reaction kettle, placing the stainless steel reaction kettle in a muffle furnace for reaction at 200 ℃ for 10-12 hours, naturally cooling to room temperature, taking out, carrying out suction filtration on the obtained solution, washing with distilled water for 4-6 times, and drying in an oven at 70-80 ℃ for 4-6 hours to obtain a finished product of bismuth ferrite nano particles;
B. preparing bismuth ferrite nano particles by adopting a sol-gel method:
dissolving 0.005-0.006mol of ferric nitrate and 0.005-0.006mol of bismuth nitrate in 20-30mL of ethylene glycol monomethyl ether, and adding 20-25 mol of bismuth nitrateμAdding 0.008-0.01mol of citric acid and 10-15mL of ethylene glycol into L0.1 mol/L nitric acid solution, stirring the formed mixture at 60-70 ℃ for 1-2 hours to form sol, heating the obtained sol at 100-120 ℃ for 5-6 hours to form brown gel, placing the brown gel on an electric furnace, heating at 100-120 ℃ for 30-40 minutes, then calcining at 500-600 ℃ in a muffle furnace for 2-3 hours, cooling to room temperature, and grinding the obtained bismuth ferrite product for later use;
(2) preparing a plant fiber suspension: weighing 300-400g needle-leaved wood pulp board, soaking in 8-10L water for 30-40min, shredding into small pulp sheets of 3cm × 3cm, adding 10-12L water into the pulp groove of the groove type pulping machine, starting the pulping machine, slowly adding the small pulp sheets for pulping until the pulping degree reaches 40-60oStopping pulping when SR is performed, taking out the pulp, squeezing water, placing the pulp in a sealed bag to balance water, and finally measuring the water content of the paper pulp;
(3) preparing the bismuth ferrite paper-based composite material:
and (3) adding 2-6g of the paper pulp obtained in the step (2) into deionized water, stirring to obtain a dispersion liquid, adding 6g of bismuth ferrite into the dispersion liquid, stirring to obtain a well-dispersed dispersion liquid, copying the obtained dispersion liquid by adopting a rapid Kaiser method, and drying to obtain the bismuth ferrite paper-based composite material.
2. The preparation method of the paper-based bismuth ferrite composite material with the heterogeneous adsorption catalysis function according to claim 1, characterized by comprising the following steps: when the composite material is prepared by using the rapid kaiser forming method, PEI is used as a retention aid, and PAE is used as a wet strength agent, so that bismuth ferrite stably exists in the composite material.
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| CN104772149A (en) * | 2015-04-07 | 2015-07-15 | 大连理工大学 | Bi2O3/BiFeO3/TiO2 nano-flower photocatalytic material and preparation method thereof |
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