CN110773133B - Preparation method of dye wastewater adsorbent and purification method of dye wastewater - Google Patents
Preparation method of dye wastewater adsorbent and purification method of dye wastewater Download PDFInfo
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
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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
- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
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- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
- B01J2220/4825—Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
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Abstract
The invention relates to the field of wastewater purification, in particular to a preparation method of a dye wastewater adsorbent and a purification method of dye wastewater, wherein the preparation method of the dye wastewater adsorbent comprises the following steps: (1) recovering waste corn straws in crops, drying, and removing leaves, outer-layer epidermis and stem nodes of the corn straws to obtain corn piths; (2) grinding and sieving the corn pith, mixing the corn pith with a sodium hydroxide aqueous solution, placing the mixture in an ultrasonic device for ultrasonic treatment, fully washing the corn pith to be neutral, and finally drying to obtain the alkalized corn pith; (3) uniformly mixing the alkalized corn pith with xylanase, fully reacting the alkalized corn pith with the xylanase, fully washing the corn pith after reaction to be neutral, and drying; (4) and (4) mixing the corn pith obtained in the step (3) with an L-malic acid aqueous solution, and uniformly stirring. The adsorbent prepared by the invention has excellent adsorption performance on dyes.
Description
Technical Field
The invention relates to the field of wastewater purification, in particular to a preparation method of a dye wastewater adsorbent and a purification method of dye wastewater.
Background
The wastewater treatment is to treat the wastewater by physical, chemical and biological methods, purify the wastewater and reduce pollution, so as to achieve the purposes of wastewater recovery and reutilization.
The printing and dyeing process often consumes large amounts of water and produces printing and dyeing industrial wastewater in production units that is rich in color, contains active agent dyes and chemical residues, and has high concentrations of COD (chemical oxygen demand) and BOD (biochemical oxygen demand). The main component of the dye in the printing and dyeing industrial wastewater is an aromatic heterocyclic compound, which has a color developing group and a polar group, so that the structure is more complex and stable, the dye is difficult to degrade, the environment is greatly polluted, and the normal operation of wastewater structures is greatly influenced, so that the dye-containing wastewater in the printing and dyeing industrial production must be properly treated.
Disclosure of Invention
In order to overcome the defects of the prior art, the first object of the invention is to provide a preparation method of a dye wastewater adsorbent, and the prepared adsorbent has excellent adsorption performance on dyes.
The second object of the present invention is to provide a purification method of dye wastewater, which is advantageous for improving the adsorption purification effect of dye wastewater adsorbent on dye.
The first purpose of the invention is solved by the following technical scheme:
the preparation method of the dye wastewater adsorbent comprises the following steps:
(1) recovering waste corn straws in crops, drying, and removing leaves, outer skin and stem nodes of the corn straws to obtain corn pith;
(2) grinding and sieving the corn pith, mixing the corn pith with a sodium hydroxide aqueous solution, placing the mixture in an ultrasonic device for ultrasonic treatment, fully washing the corn pith to be neutral, and finally drying to obtain the alkalized corn pith;
(3) uniformly mixing the alkalized corn pith with xylanase, fully reacting the alkalized corn pith with the xylanase, fully washing the corn pith after reaction to be neutral, and drying;
(4) mixing the corn pith obtained in the step (3) with an L-malic acid aqueous solution, and uniformly stirring;
(5) and (4) drying the corn pith in the step (4), then fully cleaning to be neutral, and finally drying to be constant weight to prepare the dye wastewater adsorbent.
Further, in the step (2), the concentration of the aqueous solution of sodium hydroxide is 0.1 to 1 mol/L.
Further, in the step (2), the adding ratio of the corn pith to the sodium hydroxide aqueous solution is 1 g: 40-50 mL.
Further, in the step (2), the power of the ultrasonic device is 60-240W, and the processing time is 15-60 min.
The corn pith can be fully pretreated by adopting the ultrasonic power, the adsorption performance of the adsorbent to the dye is more favorably improved, when the power is less than 60W, the influence of the adsorbent to the adsorption performance of the dye is not obvious because the corn pith is incompletely pretreated, and when the power is more than 240W, the internal structure of the corn pith is damaged, and the adsorption performance of the adsorbent to the dye is also influenced. Preferably, the power of the ultrasonic device is 120W.
Further, in step (3), the ratio between the alkalized corn pith and the xylanase is 1 g: 50-200U.
The xylanase with the content is added to remove hemicellulose in the corn pith, so that the cellulose content is improved, the subsequent reaction of straw cellulose and L-malic acid is facilitated, the modification effect of the L-malic acid on the corn pith is improved, and the adsorption performance of the adsorbent on the dye is further improved.
Further, in the step (3), the reaction temperature of the alkalized corn pith and the xylanase is 40-60 ℃, and the reaction time is 4-10 h.
According to the invention, the reaction temperature of the alkalized corn pith and the xylanase is controlled within the range, so that the reaction activity of the xylanase is favorably improved, the alkalized corn pith and the xylanase are fully reacted, the hemicellulose content in the corn pith is fully removed, and the adsorption performance of an adsorbent on dye is favorably improved. And when the temperature is too high, the xylanase is easy to inactivate, when the temperature is too low, the xylanase reaction activity is too low, and the reaction of the xylanase and alkalized corn pith is not facilitated by too high or too low temperature. Preferably, the reaction temperature of the alkalized corn pith and xylanase is 45 ℃.
Further, in the step (4), the concentration of the L-malic acid aqueous solution is 0.5-2.0 mol/L.
By adding the L-malic acid aqueous solution with the concentration, the carboxyl in the L-malic acid aqueous solution and the straw hydroxyl are subjected to esterification reaction, and the carboxyl in the reaction is increased to improve the adsorption effect of the adsorbent on the dye.
Further, in the step (4), the ratio of the alkalized corn pith to the L-malic acid aqueous solution is 1 g: 40-50 mL.
When the addition amount of the L-malic acid aqueous solution is too low, the amount of carboxyl provided by the L-malic acid aqueous solution is less, so that the hydroxyl in the straw fiber is incompletely reacted, the adsorption effect of the adsorbent on the dye is influenced, and when the addition amount of the L-malic acid is too much, resource waste is caused.
Further, in the step (4), the stirring rate is 200-300r/min, and the stirring time is 30-60 min.
Further, in the step (5), the drying temperature is 100-.
The second purpose of the invention is solved by the following technical scheme:
the dye waste water purifying process includes the following steps: adjusting the pH value of the dye wastewater to 6-9, adding the dye wastewater adsorbent prepared by the preparation method of any one of claims 1-9 into the dye wastewater, and finally stirring uniformly and reacting for 2-3 h.
The beneficial effects of the invention are:
the preparation method of the dye wastewater adsorbent has the advantages that the corn pith is selected as a raw material, the L-malic acid solution is used for modifying the corn pith, the conditions of each preparation step are strictly controlled, so that the prepared dye wastewater adsorbent has an excellent adsorption effect on the dye, the adsorption amount of the prepared dye wastewater adsorbent on the methylene blue solution can reach 422.13mg/g, the corn pith is modified by the preparation method, the adsorption amount of the modified corn pith on the methylene blue is more than 7.5 times of that of the unmodified corn pith on the methylene blue, and the excellent adsorption effect enables the dye wastewater adsorbent prepared by the preparation method to be applied to industrial wastewater purification.
According to the wastewater purification method, the dye wastewater adsorbent prepared by the preparation method is adopted, and the pH value and the purification time length during use are strictly controlled, so that the purification effect of the wastewater purification method is greatly improved, when the adsorption and purification time length is 2 hours, the adsorption amount of the dye wastewater adsorbent to the dye is more than 299mg/g when the pH value of the wastewater is controlled to be 6-8, and when the pH value is unchanged, the adsorption amount of the dye wastewater adsorbent to the dye can reach more than 300mg/g when the wastewater is treated by the dye wastewater adsorbent for 40 min.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a bar graph of the adsorption of methylene blue before and after modification of corn leaves and corn cobs according to the invention;
FIG. 2 is a graph showing the adsorption amount of methylene blue at different concentrations by the dye wastewater adsorbent of the present invention;
FIG. 3 is a graph showing the adsorption amount of the dye wastewater adsorbent of the present invention to methylene blue solutions of different pH;
FIG. 4 is a graph showing the adsorption amount of methylene blue, which is a dye wastewater adsorbent of the present invention, at different adsorption times;
FIG. 5 is a graph showing the quasi-second order kinetic curve of the adsorption of methylene blue by the dye wastewater adsorbent of the present invention, the degree of fitting R 2 Is 0.9995, which shows that the adsorption of methylene blue on the core of the malic acid modified corn is mainly dominant in chemical adsorption, and a chelation reaction and an ion exchange effect between the adsorbent and an adsorbed substance are designed.
Detailed Description
The present invention will be further described with reference to the following examples for facilitating understanding of those skilled in the art, and the description of the embodiments is not intended to limit the present invention.
Example 1
A preparation method of a dye wastewater adsorbent comprises the following steps:
(1) recovering waste corn straws in crops, drying the corn straws at 55 ℃, removing leaves, outer-layer epidermis and stem nodes of the corn straws to obtain corn cobs, wherein the obtained corn cobs do not contain other impurities;
(2) firstly, grinding and sieving a corn pith, then mixing the corn pith with a sodium hydroxide aqueous solution with the concentration of 0.5mol/L, and then placing the mixture in an ultrasonic device for ultrasonic treatment, wherein the mixing ratio of the corn pith to the sodium hydroxide aqueous solution is 1 g: 45mL, wherein the power of the ultrasonic device is 120W, and the processing time is 37 min;
then fully washing the corn pith for 1.5h to be neutral, and finally drying at the temperature of 55 ℃ to obtain the alkalized corn pith;
(3) mixing the alkalized corn pith and xylanase according to the proportion of 1 g: uniformly mixing 125U in a mixing ratio, controlling the reaction temperature to be 45 ℃, reacting for 7 hours to ensure that the alkalized corn pith fully reacts with xylanase, fully washing the corn pith after reaction to be neutral, and drying;
(4) mixing the corn pith obtained in the step (3) with an L-malic acid aqueous solution with the concentration of 1.2mol/L, wherein the mixing ratio of the alkalized corn pith to the L-malic acid aqueous solution is 1 g: 45mL, and stirring uniformly, wherein the stirring speed is 250r/min, and the stirring time is 45 min;
(5) and (5) drying the corn pith obtained in the step (4) at 120 ℃ for 2.5h, then fully cleaning to be neutral, and finally drying to be constant weight to obtain the dye wastewater adsorbent.
Example 2
A preparation method of a dye wastewater adsorbent comprises the following steps:
(1) recovering waste corn straws in crops, drying the corn straws at 50 ℃, removing leaves, outer-layer epidermis and stem nodes of the corn straws to obtain corn cobs, wherein the obtained corn cobs do not contain other impurities;
(2) firstly, grinding and sieving a corn pith, then mixing the corn pith with a sodium hydroxide aqueous solution with the concentration of 0.1mol/L, and then placing the mixture in an ultrasonic device for ultrasonic treatment, wherein the mixing ratio of the corn pith to the sodium hydroxide aqueous solution is 1 g: 40mL, wherein the power of the ultrasonic device is 60W, and the processing time is 15 min;
fully washing the corn pith for 1h to be neutral, and finally drying at 50 ℃ to obtain the alkalized corn pith;
(3) mixing the alkalized corn pith and xylanase according to the proportion of 1 g: uniformly mixing 50U of the mixture according to a mixing ratio, controlling the reaction temperature to be 40 ℃, reacting for 4 hours to ensure that the alkalized corn pith fully reacts with the xylanase, and then fully washing the corn pith after reaction to be neutral and drying;
(4) mixing the corn pith obtained in the step (3) with an L-malic acid aqueous solution with the concentration of 0.5mol/L, wherein the mixing ratio of the alkalized corn pith to the L-malic acid aqueous solution is 1 g: 40mL, and stirring uniformly, wherein the stirring speed is 200r/min, and the stirring time is 30 min;
(5) and (4) drying the corn pith in the step (4) for 1h at the temperature of 100 ℃, then fully cleaning to be neutral, and finally drying to be constant weight to prepare the dye wastewater adsorbent.
Example 3
A preparation method of a dye wastewater adsorbent comprises the following steps:
(1) recovering waste corn straws in crops, drying the corn straws at the temperature of 60 ℃, removing leaves, outer-layer epidermis and stem nodes of the corn straws to obtain corn cobs, wherein the obtained corn cobs do not contain other impurities;
(2) firstly, grinding and sieving a corn pith, then mixing the corn pith with a sodium hydroxide aqueous solution with the concentration of 1mol/L, and then placing the mixture in an ultrasonic device for ultrasonic treatment, wherein the mixing ratio of the corn pith to the sodium hydroxide aqueous solution is 1 g: 50mL, wherein the power of the ultrasonic device is 240W, and the processing time is 60 min;
fully washing the corn pith for 2 hours to be neutral, and finally drying at 60 ℃ to obtain the alkalized corn pith;
(3) mixing the alkalized corn pith and xylanase according to the proportion of 1 g: uniformly mixing 200U of the components in a mixing ratio, controlling the reaction temperature to be 60 ℃, reacting for 10 hours to ensure that the alkalized corn pith fully reacts with xylanase, fully washing the corn pith after reaction to be neutral, and drying;
(4) mixing the corn pith obtained in the step (3) with an L-malic acid aqueous solution with the concentration of 2.0mol/L, wherein the mixing ratio of the alkalized corn pith to the L-malic acid aqueous solution is 1 g: 50mL, and stirring uniformly, wherein the stirring speed is 300r/min, and the stirring time is 60 min;
(5) and (5) drying the corn pith obtained in the step (4) at 140 ℃ for 4h, then fully cleaning to be neutral, and finally drying to be constant weight to obtain the dye wastewater adsorbent.
Example 4
A dye wastewater purification method comprises the following steps: firstly, the pH value of the dye wastewater is adjusted to be 8, then the dye wastewater adsorbent prepared by the preparation method of example 1 is added into the dye wastewater, and finally, the mixture is uniformly stirred and reacted for 2 hours.
Example 5
A purification method of dye wastewater, the purification step of which is different from that of example 4 in that the pH of the dye wastewater of example 5 is adjusted to 7.
Example 6
A purification method of dye wastewater, the purification step of which is different from that of example 4, in that the pH of the dye wastewater of example 6 is adjusted to 6.
Example 7
A purification method of dye wastewater is disclosed, wherein the purification step is different from that of example 4 in that the reaction time of example 7 is 2.5 hours.
Example 8
A purification method of dye wastewater is disclosed, wherein the purification step is different from that of example 4 in that the reaction time of example 6 is 3 hours.
Comparative example 1
A preparation method of a dye wastewater adsorbent is different from that of example 1 in that corn leaves are used in the comparative example 1 to replace corn cobs in the example 1.
Performance testing
The test method comprises the following steps:
1.1 Standard Curve plotting
Preparing a methylene blue standard stock solution: weighing 1.0000g of methylene blue, dissolving in pure water, and metering to 1000mL (1000 mg/L);
respectively putting 1.00mL, 2.00mL, 3.00mL, 4.00mL and 5.00mL of methylene blue standard stock solution into a 100mL volumetric flask, and performing constant volume to obtain solutions with the concentrations of 1.00mg/L, 2.00mg/L, 3.00mg/L, 4.00mg/L and 5.00 mg/L;
the absorbance of the methylene blue solution of different concentrations is measured at 665nm by an ultraviolet spectrophotometer with pure water as a reference, and a concentration-absorbance curve is drawn (the degree of fitting R2 is required to be more than 0.9990).
1.2 adsorption experiment of dye wastewater adsorbent
a. Preparing a methylene blue standard use solution: taking 100mL of methylene blue standard stock solution into a volumetric flask, fixing the volume to 1000mL, and preparing a methylene blue standard use solution with the concentration of 100 mg/L;
b. weighing 0.0100g of dye wastewater adsorbent, adding into a 50mL polyethylene centrifuge tube, adding 40mL of methylene blue standard use solution, placing into a shaking table, and adsorbing at 25 ℃ at 150r/min for 2 hours;
c. taking 0.50ml of the adsorbed solution, adding the solution into a 10ml colorimetric tube, adding water to the scale 10, shaking up, measuring the absorbance at 665nm, and calculating the corresponding concentration from a standard curve;
the adsorption amount is calculated by the following formula:
in the formula: qe-adsorption amount of dye wastewater adsorbent (mg/g);
c1-concentration of solution before adsorption (mg/L);
c2-concentration of solution after adsorption (mg/L);
n is dilution multiple;
v-volume of solution added (ml);
m-weight of Material (g)
Test 1:
the dye wastewater adsorbents obtained by the preparation methods of examples 1 to 3 and comparative example 1 were selected, respectively, and the adsorption amounts of the dye wastewater adsorbents of examples 1 to 3 and comparative example 1 to the methylene blue solution were tested by the above test method, and unmodified corn leaves and corn cobs were selected and the adsorption amounts of the unmodified corn leaves and corn cobs to the methylene blue solution were tested by the above test method. Wherein, the adsorption amounts of the dye wastewater adsorbents of examples 1 to 3 were measured to exceed 300mg/g, which is greater than that of the adsorbent of comparative example 1, and the pH of the methylene blue solution was 9.
The test results of example 1, comparative example 1, unmodified corn leaf and unmodified corn core were recorded in groups a, B, C and D in table 1, respectively.
TABLE 1 adsorption of methylene blue before and after modification of maize leaves and maize pith
| Group of | A | B | C | D |
| Amount of adsorption (mg/g) | 338.00 | 83.44 | 80.64 | 53.41 |
As can be seen from table 1, the corn leaves and the corn pith are modified by the preparation method of the present invention, on one hand, the modified corn leaves have a better methylene blue adsorption effect compared to the unmodified corn leaves, and the modified corn pith has a greatly improved methylene blue adsorption effect compared to the unmodified corn pith, which indicates that the preparation method of the present invention can improve the adsorption performance of the adsorbent to the dye wastewater; on the other hand, compared with unmodified corn leaves, the modified corn leaves have a smaller effect of improving the adsorption effect of methylene blue, the adsorption amount of the modified corn pith is 338mg/g, which is 6 times of that of the unmodified corn pith, the improvement effect is obvious, and the adsorption effect of the unmodified corn pith is poorer than that of the unmodified corn leaves, so that the preparation method and the corn pith are combined to play a role in synergy.
Test 2:
0.0100g of the dye wastewater adsorbent prepared by the preparation method of example 1 was weighed, and the adsorption amount of the dye wastewater adsorbent to methylene blue of different concentrations at 25 ℃ for 2 hours was measured, and the adsorption amount is shown in table 2.
Table 2 adsorption amount of methylene blue of different concentrations by the dye wastewater adsorbent of example 1
| Initial concentration of methylene blue (mg/L) | 25 | 50 | 100 | 150 | 200 | 300 | 500 |
| Adsorption Capacity (mg/g) | 89.79 | 180.35 | 338.52 | 382.60 | 401.00 | 422.13 | 396.93 |
As can be seen from Table 2, the dye wastewater adsorbent prepared by the preparation method of the invention has good adsorption effect in both low-concentration and high-concentration methylene blue solutions, the adsorption capacity of the adsorbent is increased along with the increase of the initial concentration, and the adsorption amount in the solution with the concentration of 200mg/L or more reaches 400mg/g or more. The dye wastewater adsorbent prepared by the preparation method disclosed by the invention is good in adsorption effect, has a wider application range, and has a promoting effect on treatment of dye wastewater by using the biomass adsorbent. The material has good prospect for treating dye wastewater in the future, and has the characteristics of economy, high efficiency, wide application range and the like, thereby having important significance for environmental protection.
0.0100g of the dye wastewater adsorbent prepared by the preparation method of example 1 was weighed, and the adsorption amount thereof to 100mg/L methylene blue for 2 hours at 25 ℃ at pH values of 2, 3, 4, 5, 6, 7 and 8 was measured, as shown in Table 3.
TABLE 3 adsorption Effect of dye wastewater adsorbents on methylene blue solutions of different pH
| |
2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Adsorption Capacity (mg/g) | 13.36 | 81.25 | 245.41 | 293.55 | 299.47 | 304.72 | 305.17 |
As can be seen from table 3, the influence of pH on the purification performance of the dye wastewater adsorbent of the present invention is significant, and particularly, the pH is in the range of 2 to 5, and the purification effect of the dye wastewater adsorbent of the present invention on dye wastewater is affected due to too low pH, and the purification performance of the dye wastewater adsorbent is worse as the pH is lowered, and the adsorption amount of the dye wastewater adsorbent of the present invention on methylene blue is only 13.36mg/g at a pH of 2. This indicates that the adsorption of methylene blue by malic acid modified corn cobs is inhibited when more H + is present in the solution. The main reasons are that H + occupies adsorption sites on the surface of the corn pith, and the adsorption of methylene blue by the corn pith is prevented, and the H + is excessively accumulated on the surface of the corn pith, so that the surface of the corn pith is positively charged and forms electrostatic repulsion with methylene blue cations. In order to keep a good adsorption capacity of the malic acid modified corn pith on methylene blue, when the dye wastewater adsorbent is used under a low pH value condition, the pH value of a wastewater solution needs to be properly adjusted.
Test 4:
0.0100g of the dye wastewater adsorbent prepared by the preparation method of example 1 was weighed and measured for adsorption amount of 100mg/L methylene blue at 25 ℃ for different time periods, wherein the pH of the methylene blue solution was 9 and the adsorption amount is shown in Table 4.
TABLE 4 influence of adsorption time on adsorption effect of dye wastewater adsorbent
| Time (min) | Adsorption Capacity (mg/g) |
| 5 | 189.6 |
| 10 | 233.6 |
| 15 | 257.97 |
| 20 | 267.17 |
| 30 | 287.01 |
| 40 | 309.73 |
| 60 | 318.93 |
| 90 | 327.33 |
| 120 | 338.52 |
| 150 | 339.04 |
| 180 | 342.07 |
As can be seen from Table 4, the adsorption effect of the malic acid modified corn pith on methylene blue is very obvious, the adsorption amount is up to 180mg/g in 5min, the adsorption amount can reach more than 300mg/g in 40min, and the adsorption amount reaches 340mg/g in 180 min. The adsorption capacity rises linearly in 5-40min, the adsorption rate of the material to methylene blue is slowed down after 40min, the saturation state is gradually reached, and the adsorption capacity curve is gradually gentle in 120 min. Therefore, 120min can be selected as the adsorption time in the adsorption process. The absorption curve of the malic acid modified corn pith to methylene blue at different times shows that the material is a green biological absorbent which has high efficiency, good effect, low energy consumption, and is very economical and environment-friendly.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The preparation method of the dye wastewater adsorbent is characterized by comprising the following steps: the method comprises the following steps:
(1) recovering waste corn straws in crops, drying, and removing leaves, outer-layer epidermis and stem nodes of the corn straws to obtain corn piths;
(2) grinding and sieving the corn pith, mixing the corn pith with a sodium hydroxide aqueous solution, placing the mixture in an ultrasonic device for ultrasonic treatment, fully washing the corn pith to be neutral, and finally drying to obtain the alkalized corn pith;
the power of the ultrasonic device is 60-240W, and the processing time is 15-60 min;
(3) uniformly mixing the alkalized corn pith and xylanase to ensure that the alkalized corn pith and the xylanase fully react, and then fully washing the reacted corn pith to be neutral and drying;
(4) mixing the corn pith obtained in the step (3) with an L-malic acid aqueous solution, and uniformly stirring;
the stirring speed is 200-300r/min, and the stirring time is 30-60 min;
(5) and (4) drying the corn pith in the step (4), then fully cleaning to be neutral, and finally drying to be constant weight to prepare the dye wastewater adsorbent.
2. The method for preparing the adsorbent for dye wastewater according to claim 1, characterized in that: in the step (2), the concentration of the sodium hydroxide aqueous solution is 0.1-1 mol/L.
3. The method for preparing the adsorbent for dye wastewater according to claim 1, wherein: in the step (2), the adding ratio of the corn pith to the sodium hydroxide aqueous solution is 1 g: 40-50 mL.
4. The method for preparing the adsorbent for dye wastewater according to claim 1, characterized in that: in the step (3), the ratio of the alkalized corn pith to the xylanase is 1 g: 50-200U.
5. The method for preparing the adsorbent for dye wastewater according to claim 1, characterized in that: in the step (3), the reaction temperature of the alkalized corn pith and the xylanase is 40-60 ℃, and the reaction time is 4-10 h.
6. The method for preparing the adsorbent for dye wastewater according to claim 1, wherein: in the step (4), the concentration of the L-malic acid aqueous solution is 0.5-2.0 mol/L.
7. The method for preparing the adsorbent for dye wastewater according to claim 1, characterized in that: in the step (4), the ratio of the corn pith to the L-malic acid aqueous solution is 1 g: 40-50 mL.
8. The dye wastewater purification method is characterized by comprising the following steps: the method comprises the following steps: adjusting the pH value of the dye wastewater to 6-9, adding the dye wastewater adsorbent prepared by the preparation method of any one of claims 1-7 into the dye wastewater, and finally stirring uniformly and reacting for 2-3 h.
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| CN105854822A (en) * | 2016-04-21 | 2016-08-17 | 华南理工大学 | Method for preparing Cu<2+> adsorbent from corn stalk enzymolysis residue and application of Cu<2+> adsorbent |
| CN107398255A (en) * | 2017-06-12 | 2017-11-28 | 华中科技大学文华学院 | A kind of method that waste water is handled using modified corn core |
| CN107439911A (en) * | 2017-08-03 | 2017-12-08 | 黑龙江省科学院大庆分院 | Improve the method that sprouted unpolished rice quality removes rice bran taste |
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2019
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105854822A (en) * | 2016-04-21 | 2016-08-17 | 华南理工大学 | Method for preparing Cu<2+> adsorbent from corn stalk enzymolysis residue and application of Cu<2+> adsorbent |
| CN107398255A (en) * | 2017-06-12 | 2017-11-28 | 华中科技大学文华学院 | A kind of method that waste water is handled using modified corn core |
| CN107439911A (en) * | 2017-08-03 | 2017-12-08 | 黑龙江省科学院大庆分院 | Improve the method that sprouted unpolished rice quality removes rice bran taste |
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| "Carboxylic acid functionalized sesame straw: A sustainable cost-effective bioadsorbent with superior dye adsorption capacity";Feng Yanfang et al.;《Bioresource Technology》;20170421;第238卷;第675-683页 * |
| "三种改性玉米秸秆对水中亚甲基蓝吸附性能的研究";慈金娜;《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅰ辑》;20170215(第02期);B027-1796 * |
| "改性玉米秸秆对铜离子的吸附性能";刘晓东等;《大连工业大学学报》;20180315;第37卷(第2期);第100-104页 * |
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