Bamboo pulp cellulose separation membrane and preparation method thereof

Abstract

The invention discloses a preparation method of a bamboo pulp cellulose separation membrane, which comprises the following steps: placing phytic acid, bamboo pulp cellulose, urea and water in a reactor, reacting to obtain a mixture, and placing the mixture in a container for heat preservation; curing the mixture; repeatedly carrying out suction filtration and washing on the cured product with deionized water for multiple times until the pH value of a washing solution is neutral and the washing solution does not have yellow color; placing the washed bamboo pulp cellulose in a container according to a fixed mass ratio of the washed bamboo pulp cellulose to water, continuously stirring for a period of time, then assisting in vacuum filtration to obtain a filter cake, and further compacting and drying to obtain the bamboo pulp cellulose separation membrane. The method is simple to operate, low in cost and simple in reaction condition; the adopted basic material can be extracted from recycled agricultural and forestry wastes, so that the recycling of waste resources is realized; and the adopted base materials are all biomass materials, can be naturally degraded, and are environment-friendly. The removal rate of the phytic acid modified bamboo pulp cellulose on special metal ions in the waste liquid is obviously improved.

Description

Technical Field

[0001] The invention belongs to the technical field of separation membranes, and more specifically, relates to a bamboo pulp cellulose separation membrane and a preparation method thereof. Background Art

[0002] Conventional treatment technologies for heavy metal ions in radioactive waste liquid include adsorption, membrane separation, photocatalysis, electrochemical deposition, ion exchange, etc. Among them, membrane separation technology has attracted widespread attention for its advantages of being green, efficient, and energy-saving. Nowadays, the variety of filter membranes is increasing, and their performance is constantly improving. Filter membranes have been widely used in various water treatment projects at home and abroad. They have good separation effects, stable effluent quality, reliable operation, low energy consumption, and good economy. Traditional filter membranes mainly include polysulfone (SPS), polyethersulfone (PES), polyamide (PA), etc. Among them, the most widely used are PA and its composite materials. These materials are generally petroleum-based materials, which have the disadvantages of being difficult to degrade, non-renewable, and polluting the environment. Biomass materials can solve the above disadvantages.

[0003] Bamboo contains nearly half of cellulose, and bamboo is one of the fastest growing plants in the world and an important forest resource second only to wood. Cellulose is the most abundant biomass polymer in nature, with the advantages of wide sources, low price, green and renewable, biodegradable, and super hydrophilic. Phytic acid has six phosphate groups, which has a strong metal chelating ability and is widely used in the field of water treatment. At the same time, phytic acid is widely present in cereal seeds and most vegetable plants. The large amount of hydroxyl groups contained in cellulose provides the possibility of chemical modification using phytic acid. The present invention utilizes the phosphatidylesterification reaction between cellulose and phytic acid, fixes phytic acid on cellulose through covalent bonds, and prepares a phytic acid-modified cellulose separation membrane, which can intercept wastewater to separate and remove radioactive metal ions such as cesium, strontium, cobalt, etc. Summary of the invention

[0004] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages which will be described hereinafter.

[0005] In order to achieve these purposes and other advantages according to the present invention, a method for preparing a bamboo pulp cellulose separation membrane is provided, comprising the following steps:

[0006] Step 1, placing phytic acid, bamboo pulp cellulose, urea and water in a reactor, reacting under certain temperature conditions to obtain a mixture, and then placing the mixture in a container and keeping it warm for a period of time;

[0007] Step 2, curing the mixture in step 2 at a certain temperature;

[0008] Step 3: The solidified product is repeatedly filtered and washed with deionized water for multiple times until the pH of the washing liquid is neutral and not yellow;

[0009] Step 4: Place the washed bamboo pulp cellulose in step 3 in a container at a fixed mass ratio with water, continue stirring for a period of time, and then use vacuum filtration to assist in obtaining a filter cake, which is further compacted and dried to obtain a bamboo pulp cellulose separation membrane.

[0010] Preferably, in step one, the bamboo pulp cellulose includes but is not limited to one or more of moso bamboo cellulose, nan bamboo cellulose and taro bamboo cellulose.

[0011] Preferably, in the step 1, the phytic acid concentration is 70%.

[0012] Preferably, in step 1, the mass ratio of phytic acid, bamboo pulp cellulose, urea and water is 1-6:1:1-6:30-80.

[0013] Preferably, in the step 1, the reaction temperature is 60-100° C., the reaction time is 30-60 min, the insulation temperature is 50-80° C., and the insulation time is 10-24 h.

[0014] Preferably, in the step 2, the curing temperature is 110-190° C., and the curing time is 15-60 min.

[0015] Preferably, in step three, the number of suction filtration and washing is more than 5 times.

[0016] Preferably, in step 4, the mass ratio of the bamboo pulp cellulose to deionized water is 1:100.

[0017] Preferably, in the step 4, the continuous stirring time should not exceed 2 hours.

[0018] A bamboo pulp cellulose separation membrane is prepared by the above-mentioned bamboo pulp cellulose separation membrane preparation method.

[0019] In order to improve the specific surface area, porosity and metal ion interception rate of the bamboo pulp cellulose separation membrane, after obtaining the mixture in step 1, add modified flaky alumina and polyethylene glycol-400 to the mixture, ultrasonic oscillate for 1 to 3 hours, the ultrasonic frequency is 40 to 60 kHz, and then stand for 6 to 12 hours and keep warm at 50 to 80°C for 10 to 24 hours; wherein the mass ratio of bamboo pulp cellulose, flaky alumina and polyethylene glycol-400 is 1:0.1 to 0.3:0.02 to 0.1; wherein the modified flaky alumina The preparation method is as follows: weigh flaky aluminum oxide with a particle size distribution of 5 to 20 μm and disperse it in anhydrous ethanol to obtain a flaky aluminum oxide suspension, wherein the mass ratio of flaky aluminum oxide to anhydrous ethanol is 10 to 50 g: 250 to 500 mL; add γ-aminopropyltriethoxysilane accounting for 2% to 5% of the mass of the flaky aluminum oxide, ultrasonically vibrate at a frequency of 60 to 80 kHz for 3 to 5 hours, then heat to 60 to 90° C., keep warm for 30 to 60 minutes, filter, wash and dry to obtain the modified aluminum oxide coated with the coupling agent.

[0020] After the bamboo pulp cellulose separation membrane is obtained in step 4, the bamboo pulp cellulose separation membrane is subjected to low-temperature plasma modification treatment. The specific method includes: placing the bamboo pulp cellulose separation membrane in a vacuum chamber, and drawing the vacuum chamber to a vacuum degree of 1.5×10 -2 Pa or less, introduce argon into the vacuum chamber, the argon flow rate is controlled at 20-120sccm, the electrodes are externally connected to 600-1800V alternating current, the pulse frequency is set to 12-24kHz, and after discharging to generate plasma for 10-20min, the discharge is stopped; nitrogen with a flow rate ratio of 18-30sccm and 6-12sccm of CF4 are introduced into the vacuum chamber, and then the discharge voltage is set to 1200-1800V, the pulse frequency is 15-32kHz, and after discharging for 5-20min, the low-temperature plasma-treated bamboo pulp cellulose separation membrane is taken out after cooling.

[0021] The present invention has at least the following beneficial effects:

[0022] 1. The present invention provides a bamboo pulp cellulose separation membrane and a preparation method thereof. The raw materials phytic acid and bamboo pulp cellulose used in the separation membrane are both from nature, are naturally non-toxic, renewable, and biodegradable, and are expected to replace petroleum-based separation membranes such as PA.

[0023] 2. The bamboo pulp cellulose separation membrane prepared by the present invention can effectively separate radioactive metal ions in wastewater, and the raw materials can be extracted in large quantities from agricultural and forestry wastes, thus realizing the secondary utilization of waste resources.

[0024] 3. Phytic acid contains a large number of phosphate groups. Under the action of urea, some of the phosphate groups react with the hydroxyl groups in bamboo pulp cellulose to form a phosphate ester. They are firmly combined with the hydroxyl groups in bamboo pulp cellulose through covalent bonds. The separation membrane is prepared by physical means. Due to the strong chelating effect of the phosphate groups, the metal ions will be retained on the separation membrane when the waste liquid passes through the bamboo pulp cellulose separation membrane, thereby achieving the purpose of purifying water quality.

[0025] The present invention increases the specific surface area and porosity of the bamboo pulp cellulose separation membrane by adding flaky aluminum oxide coated with a coupling agent γ-aminopropyltriethoxysilane into the mixture, and further enhances the interception capacity of the bamboo pulp cellulose separation membrane for heavy metal ions and improves the adsorption capacity of the bamboo pulp cellulose separation membrane for heavy metal ions after surface modification of the bamboo pulp cellulose separation membrane by low-temperature plasma.

[0026] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. DETAILED DESCRIPTION

[0027] The present invention is described in further detail below so that those skilled in the art can implement it according to the description.

[0028] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0029] Example 1

[0030] This embodiment provides a method for preparing a bamboo pulp cellulose separation membrane, which specifically comprises the following steps:

[0031] Step 1, placing 12 g of 70% phytic acid solution, 4 g of bamboo pulp cellulose, 12 g of urea, and 200 mL of deionized water in a reactor, stirring at 80° C. for 45 minutes, and then placing the resulting mixture in a culture dish and keeping it warm at 70° C. for 12 hours;

[0032] Step 2: Place the culture dish containing the mixture in an oven at 110°C for 30 minutes;

[0033] Step 3: The solidified product is repeatedly filtered and washed with deionized water for more than 5 times until the pH of the washing liquid is neutral and not yellow;

[0034] Step 4: Completely dry the washed bamboo pulp cellulose, then take 1g of bamboo pulp cellulose and disperse it in 100mL of deionized water and stir it for 2h, then use vacuum filtration to assist in obtaining a filter cake, and further compact and dry it to obtain a bamboo pulp cellulose separation membrane.

[0035] Example 2

[0036] This embodiment provides a method for preparing a bamboo pulp cellulose separation membrane, which specifically comprises the following steps:

[0037] Step 1, placing 12 g of 70% phytic acid solution, 4 g of bamboo pulp cellulose, 12 g of urea, and 200 mL of deionized water in a reactor, stirring at 80° C. for 45 minutes, and then placing the resulting mixture in a culture dish and keeping it warm at 70° C. for 12 hours;

[0038] Step 2: Place the culture dish containing the mixture in a 120°C oven for curing for 30 minutes;

[0039] Step 3: The solidified product is repeatedly filtered and washed with deionized water for more than 5 times until the pH of the washing liquid is neutral and not yellow;

[0040] Step 4: Completely dry the washed bamboo pulp cellulose, then take 1g of bamboo pulp cellulose and disperse it in 100mL of deionized water and stir it for 2h, then use vacuum filtration to assist in obtaining a filter cake, and further compact and dry it to obtain a bamboo pulp cellulose separation membrane.

[0041] Example 3

[0042] This embodiment provides a method for preparing a bamboo pulp cellulose separation membrane, which specifically comprises the following steps:

[0043] Step 1, placing 12 g of 70% phytic acid solution, 4 g of bamboo pulp cellulose, 12 g of urea, and 200 mL of deionized water in a reactor, stirring at 80° C. for 45 minutes, and then placing the resulting mixture in a culture dish and keeping it warm at 70° C. for 12 hours;

[0044] Step 2: Place the culture dish containing the culture in a 130°C oven for curing for 30 minutes;

[0045] Step 3: The solidified product is repeatedly filtered and washed with deionized water for more than 5 times until the pH of the washing liquid is neutral and not yellow;

[0046] Step 4: Completely dry the washed bamboo pulp cellulose, then take 1g of bamboo pulp cellulose and disperse it in 100mL of deionized water and stir it for 2h, then use vacuum filtration to assist in obtaining a filter cake, and further compact and dry it to obtain a bamboo pulp cellulose separation membrane.

[0047] Example 4

[0048] This embodiment provides a method for preparing a bamboo pulp cellulose separation membrane, which specifically comprises the following steps:

[0049] Step 1, placing 12 g of 70% phytic acid solution, 4 g of bamboo pulp cellulose, 12 g of urea, and 200 mL of deionized water in a reactor, stirring at 80° C. for 45 minutes, and then placing the resulting mixture in a culture dish and keeping it warm at 70° C. for 12 hours;

[0050] Step 2: Place the culture dish containing the mixture in a 140°C oven for curing for 30 minutes;

[0051] Step 3: The solidified product is repeatedly filtered and washed with deionized water for more than 5 times until the pH of the washing liquid is neutral and not yellow;

[0052] Step 4: Completely dry the washed bamboo pulp cellulose, then take 1g of bamboo pulp cellulose and disperse it in 100mL of deionized water and stir it for 2h, then use vacuum filtration to assist in obtaining a filter cake, and further compact and dry it to obtain a bamboo pulp cellulose separation membrane.

[0053] Example 5

[0054] This embodiment provides a method for preparing a bamboo pulp cellulose separation membrane, which specifically comprises the following steps:

[0055] Step 1, placing 12 g of 70% phytic acid solution, 4 g of bamboo pulp cellulose, 12 g of urea, and 200 mL of deionized water in a reactor, stirring at 80° C. for 45 minutes, and then placing the resulting mixture in a culture dish and keeping it warm at 70° C. for 12 hours;

[0056] Step 2: Place the culture dish containing the mixture in a 150°C oven for curing for 30 minutes;

[0057] Step 3: The solidified product is repeatedly filtered and washed with deionized water for more than 5 times until the pH of the washing liquid is neutral and not yellow;

[0058] Step 4: Completely dry the washed bamboo pulp cellulose, then take 1g of bamboo pulp cellulose and disperse it in 100mL of deionized water and stir it for 2h, then use vacuum filtration to assist in obtaining a filter cake, and further compact and dry it to obtain a bamboo pulp cellulose separation membrane.

[0059] Example 6

[0060] This embodiment provides a method for preparing a bamboo pulp cellulose separation membrane, which specifically comprises the following steps:

[0061] Step 1, placing 12 g of 70% phytic acid solution, 4 g of bamboo pulp cellulose, 12 g of urea, and 200 mL of deionized water in a reactor, stirring at 80° C. for 45 minutes, and then placing the resulting mixture in a culture dish and keeping it warm at 70° C. for 12 hours;

[0062] Step 2: Place the culture dish containing the mixture in a 160°C oven for curing for 30 minutes;

[0063] Step 3: The solidified product is repeatedly filtered and washed with deionized water for more than 5 times until the pH of the washing liquid is neutral and not yellow;

[0064] Step 4: Completely dry the washed bamboo pulp cellulose, then take 1g of bamboo pulp cellulose and disperse it in 100mL of deionized water and stir it for 2h, then use vacuum filtration to assist in obtaining a filter cake, and further compact and dry it to obtain a bamboo pulp cellulose separation membrane.

[0065] Example 7

[0066] This embodiment provides a method for preparing a bamboo pulp cellulose separation membrane, which specifically comprises the following steps:

[0067] Step 1, placing 12 g of 70% phytic acid solution, 4 g of bamboo pulp cellulose, 12 g of urea, and 200 mL of deionized water in a reactor, stirring at 80° C. for 45 minutes, and then placing the resulting mixture in a culture dish and keeping it warm at 70° C. for 12 hours;

[0068] Step 2: Place the culture dish containing the mixture in an oven at 170°C for 30 minutes;

[0069] Step 3: The solidified product is repeatedly filtered and washed with deionized water for more than 5 times until the pH of the washing liquid is neutral and not yellow;

[0070] Step 4: Completely dry the washed bamboo pulp cellulose, then take 1g of bamboo pulp cellulose and disperse it in 100mL of deionized water and stir it for 2h, then use vacuum filtration to assist in obtaining a filter cake, and further compact and dry it to obtain a bamboo pulp cellulose separation membrane.

[0071] Example 8

[0072] This embodiment provides a method for preparing a bamboo pulp cellulose separation membrane, which specifically comprises the following steps:

[0073] Step 1, placing 12 g of 70% phytic acid solution, 4 g of bamboo pulp cellulose, 12 g of urea, and 200 mL of deionized water in a reactor, stirring at 80° C. for 45 minutes, and then placing the resulting mixture in a culture dish and keeping it warm at 70° C. for 12 hours;

[0074] Step 2: Place the culture dish containing the mixture in an oven at 180°C for 30 minutes;

[0075] Step 3: The solidified product is repeatedly filtered and washed with deionized water for more than 5 times until the pH of the washing liquid is neutral and not yellow;

[0076] Step 4: Completely dry the washed bamboo pulp cellulose, then take 1g of bamboo pulp cellulose and disperse it in 100mL of deionized water and stir it for 2h, then use vacuum filtration to assist in obtaining a filter cake, and further compact and dry it to obtain a bamboo pulp cellulose separation membrane.

[0077] Example 9

[0078] This embodiment provides a bamboo pulp cellulose separation membrane and a preparation method thereof, which specifically comprises the following steps:

[0079] Step 1, placing 12 g of 70% phytic acid solution, 4 g of bamboo pulp cellulose, 12 g of urea, and 200 mL of deionized water in a reactor, stirring at 80° C. for 45 minutes, and then placing the resulting mixture in a culture dish and keeping it warm at 70° C. for 12 hours;

[0080] Step 2: Place the culture dish containing the mixture in an oven at 190°C for 30 minutes;

[0081] Step 3: The solidified product is repeatedly filtered and washed with deionized water for more than 5 times until the pH of the washing liquid is neutral and not yellow;

[0082] Step 4: Completely dry the washed bamboo pulp cellulose, then take 1g of bamboo pulp cellulose and disperse it in 100mL of deionized water and stir it for 2h, then use vacuum filtration to assist in obtaining a filter cake, and further compact and dry it to obtain a bamboo pulp cellulose separation membrane.

[0083] Example 10

[0084] The present embodiment provides a bamboo pulp cellulose separation membrane and a preparation method thereof, which is different from Example 3 in that, after obtaining the mixture in step one, 0.8 g of modified flaky alumina and 0.4 g of polyethylene glycol-400 are added to the mixture, ultrasonically oscillated for 1 hour at a frequency of 40 kHz, and kept at 70°C for 12 hours after standing for 6 hours; wherein, the preparation method of the modified flaky alumina is as follows: 10 g of flaky alumina with a particle size distribution of 5 to 20 μm is weighed and dispersed in 250 mL of anhydrous ethanol to obtain a flaky alumina suspension; 0.5 g of γ-aminopropyltriethoxysilane is added, ultrasonically oscillated at a frequency of 60 kHz for 3 hours, then heated to 80°C, kept warm for 30 minutes, filtered, washed, and dried to obtain the modified alumina coated with a coupling agent.

[0085] The process parameters of step 2 to step 4 are the same as those in Example 1.

[0086] After the bamboo pulp cellulose separation membrane is obtained in step 4, the bamboo pulp cellulose separation membrane is subjected to low-temperature plasma modification treatment. The specific method includes: placing the bamboo pulp cellulose separation membrane in a vacuum chamber, and drawing the vacuum chamber to a vacuum degree of 1.5×10 -2Below Pa, argon gas is introduced into the vacuum chamber, the argon flow rate is controlled at 30sccm, the electrode is connected to 800V AC, the pulse frequency is set to 20kHz, and after discharging to generate plasma for 20 minutes, the discharge is stopped; nitrogen with a flow rate ratio of 18sccm and 6sccm of CF4 are introduced into the vacuum chamber, and then the discharge voltage is set to 1200V, the pulse frequency is 30kHz, after discharging for 10 minutes, it is cooled and taken out to obtain the bamboo pulp cellulose separation membrane treated with low-temperature plasma.

[0087] Embodiment 11

[0088] The present embodiment provides a bamboo pulp cellulose separation membrane and a preparation method thereof, which is different from Example 3 in that, after obtaining the mixture in step one, 1.2 g of modified flaky alumina and 0.4 g of polyethylene glycol-400 are added to the mixture, ultrasonically oscillated for 3 h at a frequency of 60 kHz, and kept warm at 70°C for 12 h after standing for 12 h; wherein, the preparation method of the modified flaky alumina is as follows: 20 g of flaky alumina with a particle size distribution of 5 to 20 μm is weighed and dispersed in 500 mL of anhydrous ethanol to obtain a flaky alumina suspension; 0.5 g of γ-aminopropyltriethoxysilane is added, ultrasonically oscillated at a frequency of 80 kHz for 5 h, then heated to 90°C, kept warm for 60 min, filtered, washed, and dried to obtain the modified alumina coated with a coupling agent.

[0089] The process parameters of step 2 to step 4 are the same as those in Example 1.

[0090] After the bamboo pulp cellulose separation membrane is obtained in step 4, the bamboo pulp cellulose separation membrane is subjected to low-temperature plasma modification treatment. The specific method includes: placing the bamboo pulp cellulose separation membrane in a vacuum chamber, and drawing the vacuum chamber to a vacuum degree of 1.5×10 -2 Below Pa, argon gas is introduced into the vacuum chamber, the argon flow rate is controlled at 40sccm, the electrode is connected to 1800V AC, the pulse frequency is set to 24kHz, and after discharging to generate plasma for 20 minutes, the discharge is stopped; nitrogen with a flow rate ratio of 30sccm and 12sccm of CF4 are introduced into the vacuum chamber, and then the discharge voltage is set to 1800V, the pulse frequency is 32kHz, after discharging for 5 minutes, it is cooled and taken out to obtain the bamboo pulp cellulose separation membrane treated with low-temperature plasma.

[0091] Comparative Example 1

[0092] This comparative example provides a bamboo pulp cellulose separation membrane and a preparation method thereof. Compared with Example 3, the bamboo pulp cellulose separation membrane obtained in step four is subjected to low-temperature plasma modification treatment, and the process parameters of the low-temperature plasma modification treatment method and the remaining steps are the same as those in Example 3.

[0093] Comparative Example 2

[0094] This comparative example provides a bamboo pulp cellulose separation membrane and a preparation method thereof. Compared with Example 10, the bamboo pulp cellulose separation membrane obtained in step 4 is not subjected to low-temperature plasma modification treatment, and the process parameters of the remaining steps are the same as those of Example 10.

[0095] The bamboo pulp cellulose separation membranes prepared in Examples 1 to 11 and Comparative Examples 1-2 were tested for specific surface area, porosity, radiation resistance (50 kGy) and interception of radioactive metal ions (cesium, strontium, cobalt) in wastewater. The experimental method for interception of radioactive metal ions (cesium, strontium, cobalt) in wastewater by bamboo pulp cellulose separation membranes is as follows:

[0096] The test was conducted using cobalt chloride hexahydrate, cesium chloride, and strontium nitrate solutions to simulate radioactive wastewater (hereinafter referred to as cobalt ion wastewater). The retention rate was evaluated using a dead-end flow method with an effective membrane diameter of 3.8 cm.

[0097] For the interception rate evaluation, the initial concentration of 40 mg / L ion waste liquid was filtered, and the waste liquid volume was fixed at 150 mL. The membrane was placed on a sand core filtration device and filtered completely by gravity. After collecting the filtrate, the concentration of cesium, strontium, and cobalt ions was tested using flame atomic absorption spectroscopy (AAS). The interception rate was calculated using the following formula:

[0098]

[0099] Where R is the retention rate, C p is the ion concentration after interception, C f is the ion concentration of the simulated wastewater before interception.

[0100] Results The test results are shown in the following table:

[0101]

[0102] The test results of the above examples show that the bamboo pulp cellulose separation membrane prepared by the present invention has a suitable specific surface area, porosity and radiation resistance, and can effectively intercept radioactive cesium, strontium and cobalt in waste liquid.

[0103] At the same time, compared with Examples 1 to 9 and Comparative Examples 1 to 2, the bamboo pulp cellulose separation membranes prepared in Examples 10 and 11 have larger specific surface areas and porosities, and are more sensitive to metal ions Cs + , Sr 2+ 、Co 2+ The interception rate has also been significantly improved.

[0104] The number of devices and processing scales described here are used to simplify the description of the present invention. Applications, modifications and variations of the present invention will be obvious to those skilled in the art.

[0105] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the examples shown and described herein.

Claims

1. A method for preparing a bamboo pulp cellulose separation membrane, characterized in that: The following steps are involved: Step 1, placing phytic acid, bamboo pulp cellulose, urea and water in a reactor, reacting under certain temperature conditions to obtain a mixture, and then placing the mixture in a container and keeping it warm for a period of time; Step 2, curing the mixture in step 2 at a certain temperature; Step 3: The solidified product is repeatedly filtered and washed with deionized water for multiple times until the pH of the washing liquid is neutral and not yellow; Step 4: Place the washed bamboo pulp cellulose in step 3 in a container at a fixed mass ratio with water, continue stirring for a period of time, and then use vacuum filtration to assist in obtaining a filter cake, which is further compacted and dried to obtain a bamboo pulp cellulose separation membrane.

2. The method for preparing the bamboo pulp cellulose separation membrane according to claim 1, characterized in that: In the step 1, the bamboo pulp cellulose includes but is not limited to one or more of moso bamboo cellulose, nan bamboo cellulose, and taro bamboo cellulose.

3. The method for preparing the bamboo pulp cellulose separation membrane according to claim 1, characterized in that: In the step 1, the phytic acid concentration is 70%.

4. The method for preparing the bamboo pulp cellulose separation membrane according to claim 1, characterized in that: In the step 1, the mass ratio of phytic acid, bamboo pulp cellulose, urea and water is 1-6:1:1-6:30-80.

5. The method for preparing the bamboo pulp cellulose separation membrane according to claim 1, characterized in that: In the step 1, the reaction temperature is 60-100° C., the reaction time is 30-60 min, the insulation temperature is 50-80° C., and the insulation time is 10-24 h.

6. The method for preparing the bamboo pulp cellulose separation membrane according to claim 1, characterized in that: In the step 2, the curing temperature is 110 to 190° C., and the curing time is 15 to 60 minutes.

7. The method for preparing the bamboo pulp cellulose separation membrane according to claim 1, characterized in that: In the step 3, the filtration and washing times are more than 5 times.

8. The method for preparing the bamboo pulp cellulose separation membrane according to claim 1, characterized in that: In the step 4, the mass ratio of the bamboo pulp cellulose to deionized water is 1:

100.

9. The method for preparing the bamboo pulp cellulose separation membrane according to claim 1, characterized in that: In the step 4, the continuous stirring time should not exceed 2 hours.

10. A bamboo pulp cellulose separation membrane, characterized in that: The bamboo pulp cellulose separation membrane is prepared by the preparation method of the bamboo pulp cellulose separation membrane according to any one of claims 1 to 9.

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