CN115869922A - Preparation method and application of sodium alginate-embedded bamboo charcoal-green algae active cell gel bead adsorption material - Google Patents

Preparation method and application of sodium alginate-embedded bamboo charcoal-green algae active cell gel bead adsorption material Download PDF

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CN115869922A
CN115869922A CN202211641927.4A CN202211641927A CN115869922A CN 115869922 A CN115869922 A CN 115869922A CN 202211641927 A CN202211641927 A CN 202211641927A CN 115869922 A CN115869922 A CN 115869922A
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sodium alginate
green algae
bamboo charcoal
active cell
algae
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吴晓歌
王雨婷
王娟娟
曹逸凡
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Yangzhou University
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Yangzhou University
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/30Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37Wastewater or sewage treatment systems using renewable energies using solar energy

Abstract

The invention discloses a preparation method and application of a sodium alginate-embedded bamboo charcoal-green algae active cell gel bead adsorption material. Then the mixture is aged after standing for a period of time, and is fished out and repeatedly washed with deionized water for several times for use. The bamboo charcoal-green algae active cell gel pellet embedded by sodium alginate provided by the invention has the advantages of simple preparation process, low cost, stable structure, high mechanical strength, low energy consumption, good treatment effect, wide application range and the like, and has higher research value and application advantages.

Description

Preparation method and application of bamboo charcoal-green algae active cell gel bead adsorption material embedded by sodium alginate
Technical Field
The invention relates to a preparation method and application of a sodium alginate-embedded bamboo charcoal-green algae active cell gel bead adsorption material, belonging to the technical field of water treatment.
Background
Rapid industrial development has led to a demand for wastewater treatment. As an important industrial raw material, organic dyes are widely used in the paper, textile and plastic industries. Some organic dyes are toxic and difficult to degrade, can be discharged into the natural environment along with industrial wastewater, cause serious water pollution, and threaten the health of aquatic organisms and human beings.
There have been studies on the removal of dyes from wastewater by several physical, chemical and biological methods. The most common methods include ion exchange, adsorption, membrane separation and photodegradation. Currently, adsorption is considered to be one of the most effective methods for removing dyes from aqueous solutions. This method is of great interest because it is efficient, economical, simple and does not produce secondary pollution. The selection of an adsorption material with appropriate properties is important for the precise regulation of the adsorption behavior.
Along with the aggravation of the eutrophication degree of the water body, a large amount of algae are grown, the water body quality is seriously influenced, the development and research of the algae application technology are promoted, the algae have larger specific surface area, the cell wall surface functional groups of the algae are rich, such as amino, hydroxyl, carboxyl and the like, and some pollutants in the wastewater can be removed by being bonded with the functional groups or through electric adsorption.
The biomass charcoal is a porous carbon-rich solid material prepared by utilizing waste biomass materials to perform thermochemical conversion in an anoxic or anaerobic environment. Because of strong adsorption force, the preparation material has wide sources, low production cost, environmental protection and the like, more and more attention is paid.
Disclosure of Invention
The invention aims to solve the problems and provides a preparation method and application of a sodium alginate-embedded bamboo charcoal-green algae active cell gel bead adsorption material.
The purpose of the invention is realized as follows: a preparation method of a sodium alginate-embedded bamboo charcoal-green algae active cell gel bead adsorption material is characterized by comprising the following steps:
(1) Centrifuging green algae solution, pouring out supernatant to collect algae cells, adding BG11 culture medium (common fresh water blue algae and green algae culture medium) and cleaning once, standing the cleaned algae solution for 15-20 min to stabilize the algae cells in the culture medium;
(2) Counting the algae cells in the washed algae liquid by using an optical microscope, and controlling the concentration of the algae cells;
(3) Taking 30ml of the alga solution containing the green alga cells in the step (2), adding 0.6g of sodium alginate powder, and uniformly stirring by using a stirrer to ensure that the alga cells are uniformly distributed in the sodium alginate gel;
(4) Adding 15mg of bamboo charcoal powder into the sodium alginate gel solution containing green algae in the step (3), and uniformly stirring by using a stirrer again to ensure that the bamboo charcoal powder is uniformly distributed in the sodium alginate gel containing green algae cells;
(5) Preparing a calcium chloride solution by using deionized water;
(6) Slowly dripping the mixed solution prepared in the step (4) into the calcium chloride solution in the step (5) by using an injection to form small round spherical balls;
(7) Adding NaOH into the solution obtained in the step (5), carrying out ultrasonic treatment for 10min, and standing for 30-60 min for aging;
(8) And filtering the cured gel pellets by using a net bag, and washing for 2-3 times by using deionized water to remove free iron ions on the surface of the gel pellets.
In the step (2), the algae cell data in the green algae solution is 1 × 10 6 Each/ml.
In the step (3), the concentration of the sodium alginate solution is 2w/v%.
In the step (5), the concentration of the calcium chloride solution is 4w/v%.
In the step (5), the injection is 2.5 ml.
In the step (6), the diameter of the small ball is 2-3mm.
In the step (1), the BG11 culture medium is a culture medium of freshwater cyanobacteria and green algae.
A sodium alginate-embedded bamboo charcoal-green algae active cell gel bead adsorption material is applied to dye wastewater containing cations.
The method is advanced and scientific, and through the invention, the invention aims to provide the bamboo charcoal-green algae gel bead adsorption material embedded by the sodium alginate on the one hand, and the preparation method and the application of the bead on the other hand. The bamboo charcoal-green algae gel bead embedded by the sodium alginate is prepared by crosslinking sodium alginate, green algae, bamboo charcoal, deionized water and calcium chloride, wherein the sodium alginate and the bamboo charcoal are used as embedding agents, and the calcium chloride is used as a crosslinking agent.
The bamboo charcoal-green algae gel bead adsorption material embedded by sodium alginate provided by the invention can be used for utilizing green algae which originally affects the water quality and fully exerting the adsorption of the green algae to organic polluted liquid. And the green algae can be repeatedly used after being embedded, so that the influence of hydraulic migration on green algae is reduced. The bamboo charcoal can increase the adsorption performance and mechanical strength of the pellet. In addition, the bamboo charcoal-green algae gel bead adsorption material embedded by sodium alginate prepared by the invention does not need to add pore-forming agent, does not need to be roasted at high temperature, has the advantages of simple and convenient preparation method, low energy consumption, good treatment effect, wide application range, low cost and the like, and has higher research value and unique application advantage.
Compared with the prior art, the invention has the beneficial effects that:
1. the raw materials of calcium chloride, green alga and sodium alginate in the invention have wide sources, and the preparation method is simple, economic and rapid.
2. The bamboo charcoal-green algae active cell composite gel bead adsorption material embedded by sodium alginate provided by the invention can be used for utilizing green algae which originally affects the water quality and fully exerting the adsorption of the green algae on organic polluted liquid. And the green algae can be repeatedly used after being embedded, so that the influence of hydraulic migration on green algae is reduced.
3. The bamboo charcoal-green algae active cell composite gel bead adsorption material embedded by sodium alginate, prepared by the method, does not need to add a pore-forming agent and high-temperature roasting, is simple and convenient in preparation method, has the advantages of low energy consumption, good treatment effect, wide application range, low cost and the like, and has higher research value and unique application advantage.
4. The bamboo charcoal-green algae coagulation active cell composite micelle adsorbing material embedded by sodium alginate has the advantages of strong adsorption capacity, good removal rate and high adsorption capacity.
5. The bamboo charcoal-green algae active cell composite gel bead adsorption material embedded by sodium alginate has high mechanical strength, can bear high hydraulic load and has high reutilization.
Drawings
FIG. 1 shows the adsorption material of composite gel beads of bamboo charcoal-green algae activated cells embedded with sodium alginate, prepared in real-time example 1 of the present invention.
FIG. 2 is a performance diagram of removing organic pollutants of Malachite Green (MG) by using the efficient adsorption beads prepared by the invention.
FIG. 3 is a performance diagram of the high-efficiency adsorption pellets prepared by the invention for removing Crystal Violet (CV) organic pollutants.
FIG. 4 is a graph of the recycling performance of the high-efficiency adsorption beads prepared by the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples and the accompanying drawings.
The experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents, unless otherwise specified, are commercially available.
Example 1
The specific steps for preparing the bamboo charcoal-green algae active cell composite gel bead adsorption material embedded with sodium alginate in the embodiment are as follows:
(1) Centrifuging the green algae solution, pouring out the supernatant to collect algae cells, adding BG11 (common culture medium of freshwater blue algae and green algae) and cleaning for one time, and standing the cleaned algae solution for 15-20 minutes to stabilize the algae cells in the culture medium.
(2) Counting the algae cells in the washed algae solution by an optical microscope, and controlling the concentration of the algae cells to be 1 × 10 6 One per ml.
(3) 0.6g of sodium alginate powder is weighed into 30mlThe concentration of the algae cells in the step (2) is 1 multiplied by 10 6 In solution per ml (the concentration of the sodium alginate gel solution is 2 w/v%). Stirring with a stirrer for several minutes to uniformly distribute the algae cells in the sodium alginate gel.
(4) Adding 15mg of bamboo charcoal powder into the sodium alginate gel solution containing green algae cells in the step (3). Stirring with a stirrer to uniformly distribute the bamboo charcoal powder in the sodium alginate gel containing green algae cells.
(5) 4g of calcium chloride was added to 100ml of deionized water to prepare a calcium chloride solution.
(6) And (3) slowly dripping the mixed solution prepared in the step (4) into the calcium chloride solution in the step (5) by using an injection with the specification of 2.5ml to form small spheres, wherein the diameter of each small sphere is generally 2-3mm.
(7) And (4) adding NaOH into the solution obtained in the step (5), carrying out ultrasonic treatment for 10min, and standing for 30-60 min for aging.
(8) And filtering the cured gel pellets by using a net bag, and washing the gel pellets for 2-3 times by using deionized water to remove free iron ions on the surfaces of the gel pellets.
The topography is shown in figure 1.
Example 2
The concrete steps for preparing the gel bead only containing sodium alginate in the embodiment are as follows:
(1) 0.6g of sodium alginate is weighed and added into 30ml of deionized water to be stirred to form a sodium alginate gel solution.
(2) 4g of anhydrous calcium chloride is weighed and added into 100ml of deionized water to prepare a calcium chloride solution.
(3) And (3) slowly dripping the sodium alginate gel prepared in the step (1) into the calcium chloride solution in the step (2) by using an injection with the specification of 2.5ml to form small round spheres. The diameter of the pellets is typically 2-3mm.
(4) And (5) standing the pellets in the calcium chloride solution in the step (5) for 30-60 min for aging.
(5) And filtering the cured gel pellets by using a net bag, and washing for 2-3 times by using deionized water to remove free iron ions on the surface of the gel pellets.
Example 3
Evaluation of organic contaminant removing performance of the gel pellets prepared in the above example 1 and example 2.
And preparing Malachite Green (MG) solution with the initial concentration of 50MG/L to simulate organic polluted liquid wastewater, respectively adding the gel beads prepared in the examples 1 and 2, and performing an adsorption experiment for 2 hours by using a magnetic stirrer under the condition that the solid-liquid ratio is 3.
Example 4
Evaluation of organic contaminant removing performance of the gel pellets prepared in the above example 1 and example 2.
Preparing a Crystal Violet (CV) solution with the initial concentration of 25mg/L to simulate organic polluted liquid wastewater, respectively adding the gel beads prepared in the examples 1 and 2, and carrying out an adsorption experiment for 3h by using a magnetic stirrer under the condition that the solid-liquid ratio is 3.
And (4) calculating the removal rate of the organic polluted liquid and the adsorption quantity of the gel beads after the experiment is finished.
Example 5
Evaluation of performance of recycling organic contaminants from the gel beads prepared in example 1 above.
Preparing crystal violet (MG) solution with initial concentration of 50MG/L to simulate organic polluted liquid wastewater, adding the gel beads prepared in example 1, and carrying out adsorption experiment for 100min by using a magnetic stirrer under the condition that the solid-to-liquid ratio is 3.
And (4) calculating the removal rate of the organic polluted liquid and the adsorption quantity of the gel beads after the experiment is finished.
The removal rate calculation formula is as follows:
Figure SMS_1
in the formula (1)
Figure SMS_2
Removal (%); c 0 ,C e Initial concentration of MG before treatment and concentration of MG after treatment (MG/L).
Adsorption capacity calculation formula
Figure SMS_3
Q in formula (2) e -adsorption capacity, mg/g; c 0 ,C e -initial concentration before MG treatment and concentration after treatment (MG/L);
v — volume of contaminated liquid, L; m is the embedding amount of green algae and bamboo charcoal, g.
The results of the experiments with adsorbed MG are shown in fig. 2, where a represents the adsorption curve of the gel beads prepared in example 1 and B represents the adsorption curve of the sodium alginate gel beads prepared in example 2. As can be seen from fig. 2: (1) the effect of the gel pellets embedding the green algae and the bamboo charcoal is better; (2) In the best formula, the removal rate of the organic dye reaches 79.27 percent in 3 hours, and the adsorption capacity reaches 226.83mg/g.
The adsorption CV test results are shown in FIG. 3, in which C represents the adsorption curve of the gel pellet prepared in example 1 and D represents the adsorption curve of the sodium alginate gel pellet prepared in example 2. As can be seen in fig. 3: (1) the effect of the gel pellets embedding the green algae and the bamboo charcoal is better; (2) In the best formula, the removal rate of the organic dye reaches 93.6 percent after 3 hours, and the adsorption capacity reaches 75.28mg/g.
The properties of the prepared gel pellets for cyclic adsorption are shown in fig. 4. It can be seen that the material prepared according to the invention still has a high adsorption efficiency after 5 cycles.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (8)

1. A preparation method of a bamboo charcoal-green algae active cell gel bead adsorption material embedded by sodium alginate is characterized by comprising the following steps:
(1) Centrifuging the green algae solution, pouring out supernatant to collect algae cells, adding BG11 culture medium to clean, and standing the cleaned algae solution for 15-20 minutes to stabilize the algae cells in the culture medium;
(2) Counting the algae cells in the washed algae liquid by using an optical microscope, and controlling the concentration of the algae cells;
(3) Taking 30ml of the alga solution containing the green alga cells in the step (2), adding 0.6g of sodium alginate powder, and uniformly stirring by using a stirrer to ensure that the alga cells are uniformly distributed in the sodium alginate gel;
(4) Adding 15mg of bamboo charcoal powder into the sodium alginate gel solution containing green algae in the step (3), and uniformly stirring by using a stirrer again to ensure that the bamboo charcoal powder is uniformly distributed in the sodium alginate gel containing green algae cells;
(5) Preparing a calcium chloride solution by using deionized water;
(6) Slowly dripping the mixed solution prepared in the step (4) into the calcium chloride solution in the step (5) by using an injection to form small round spherical balls;
(7) Adding NaOH into the solution obtained in the step (5), carrying out ultrasonic treatment for 10min, and standing for 30-60 min for aging;
(8) And filtering the cured gel pellets by using a net bag, and washing for 2-3 times by using deionized water to remove free iron ions on the surface of the gel pellets.
2. The preparation method of the sodium alginate-embedded bamboo charcoal-green algae active cell gel bead adsorption material according to claim 1, wherein in the step (2), the concentration of the algae cells in the green algae solution is controlled to be 1 x 10 6 One per ml.
3. The preparation method of the sodium alginate-embedded bamboo charcoal-green algae active cell gel bead adsorption material according to claim 1, wherein in the step (3), the concentration of the sodium alginate solution is 2w/v%.
4. The preparation method of the sodium alginate-embedded bamboo charcoal-green algae active cell gel bead adsorption material according to claim 1, wherein in the step (5), the concentration of the calcium chloride solution is 4w/v%.
5. The preparation method of the sodium alginate-embedded bamboo charcoal-green algae active cell gel bead adsorption material according to claim 1, wherein in the step (5), the injection is 2.5ml in specification.
6. The preparation method of the sodium alginate-embedded bamboo charcoal-green algae active cell gel bead adsorption material according to claim 1, wherein in the step (6), the diameter of the bead is 2-3mm.
7. The preparation method of the sodium alginate-embedded bamboo charcoal-green algae active cell gel bead adsorption material according to claim 1, wherein in the step (1), the BG11 culture medium is a culture medium of freshwater blue-green algae and green algae.
8. The application of the bamboo charcoal-green algae active cell gel bead adsorption material embedded by sodium alginate as claimed in any one of claims 1-7 in dye wastewater containing cations.
CN202211641927.4A 2022-12-20 2022-12-20 Preparation method and application of sodium alginate-embedded bamboo charcoal-green algae active cell gel bead adsorption material Pending CN115869922A (en)

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CN106732477A (en) * 2016-11-29 2017-05-31 陕西盛迈石油有限公司 The preparation method of sodium alginate and cellulose aquagel ball
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