CN115155537B - FeOOH functionalized acrylic fiber and preparation method and application thereof - Google Patents

FeOOH functionalized acrylic fiber and preparation method and application thereof Download PDF

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CN115155537B
CN115155537B CN202210901091.0A CN202210901091A CN115155537B CN 115155537 B CN115155537 B CN 115155537B CN 202210901091 A CN202210901091 A CN 202210901091A CN 115155537 B CN115155537 B CN 115155537B
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feooh
pan
fiber
acrylic fiber
functionalized acrylic
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CN115155537A (en
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徐刚
周睿
徐武松
熊启中
徐博
罗来超
柴如山
魏俊岭
叶新新
张朝春
陈骏
束维正
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Anhui Agricultural University AHAU
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B01J20/26—Synthetic macromolecular compounds
    • B01J20/261—Synthetic macromolecular compounds obtained by reactions only involving carbon to carbon unsaturated bonds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28023—Fibres or filaments
    • 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
    • C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2101/30—Organic compounds
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    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract

The invention belongs to the technical field of wastewater treatment, and relates to FeOOH functionalized acrylic fiber and a preparation method and application thereof, wherein the preparation method comprises the following steps: 1) Synthetic aminated fiber PAN A F, performing the process; 2) FeOOH functionalized acrylic fiber PAN prepared by sol-gel method A F-FeOOH. The FeOOH functionalized acrylic fiber has the advantages of high adsorption efficiency, low treatment limit, good recycling, environmental friendliness, capability of simultaneously treating organic phosphorus and inorganic phosphorus and the like.

Description

FeOOH functionalized acrylic fiber and preparation method and application thereof
Technical Field
The invention belongs to the technical field of wastewater treatment, and relates to FeOOH functionalized acrylic fiber and a preparation method and application thereof.
Background
Phosphorus (P) is one of the indispensable elements on earth. It is not only present in the cells of the organism, maintains bone growth, but also participates in almost all physiological and chemical reactions. However, phosphorus emissions continue to increase with increasing industrial and agricultural activities. If the phosphorus concentration in the water is too high, eutrophication can be caused, algae and aquatic plants can grow excessively, the oxygen content in the water can be reduced, and the safety of human beings can be even threatened. Thus, the removal and recovery of phosphorus from water is critical to alleviating the environmental phosphorus crisis.
At present, the recycling of phosphorus in wastewater is mainly concentrated on inorganic phosphorus, and the research on recycling of organic phosphorus is less. Many studies have shown that Organic Phosphorus (OP) is also an important component of phosphorus in water, with livestock and poultry wastewater being an important source of OP, accounting for about 10-65% of total phosphorus. The Organic Phosphorus (OP) compound is widely applied to the fields of pesticides, scale inhibitors, corrosion inhibitors, laundry detergents, flame retardants, plasticizers and the like. Phosphonates (-C-PO (OH)) with one or more phosphate groups 2 ) Is a broad class of OP compounds that are commonly detected in water due to direct or indirect discharge of agricultural and industrial wastewater, which can lead to eutrophication of the water. Some OP compounds can cause mutagenicity, teratogenicity, carcinogenicity, and neurological disorders in humans by inhibiting acetylcholinesterase activity. In addition, the conversion of phosphonates in sunlight can produce aminomethylphosphonic acid (AMPA), which is more toxic and constitutes a significant risk to environmental safety. Therefore, the removal and recovery of organic phosphorus from water is an urgent issue. However, it is difficult to directly recover the organic phosphorus in the wastewater, and further research is necessary to effectively remove the organic phosphorus in the polluted water.
Advanced Oxidation Processes (AOP), e.g. O 3 Hydrogen peroxide (H) 2 O 2 ) And sulfate radical (SO 4-) oxidation, are considered as the most promising technology for degrading persistent organic pollutants due to the advantages of simple operation, low energy consumption and no secondary pollution. Wherein SO 4 -more favourable for degrading organic pollutants due to its higher selective oxidizing power, longer lifetime (30-40 mus) and wider pH adaptation range. However, SO is decomposed from Peroxodisulfate (PS) or Peroxomonosulfate (PMS) alone 4 The speed of the-' is very limited. Thus, many methods, including ultraviolet light, heat, alkali, and transitionMetals have been successfully used to activate persulfates to achieve complete degradation of organic contaminants. Among all the activation methods, transition metal activation is favored by researchers because of its advantages of simple operation, low cost, environmental friendliness, and reusability.
Comprises Fe 0 、FeS、Fe 2 O 3 And FeOOH, are potential catalysts for PS activation due to their high efficiency and low cost. The latest member of the iron family FeOOH is relatively stable and inexpensive and has been widely used for environmental remediation due to its ability to adsorb and degrade contaminants. Currently, research on FeOOH catalyst activated persulfate to degrade organic matters in water has been advanced significantly, but many problems remain to be solved. For example, silica gel, carbon materials, MOFs and other FeOOH loaded materials have made good research progress in degrading organic contaminants. However, these materials often suffer from the disadvantages of low fixation efficiency, difficult recovery, complex preparation, high cost, etc., which limits their application. Selection of a suitable support is a prerequisite for improved catalytic activity and stability. Therefore, a new carrier material is developed, a supported FeOOH catalyst with specific recognition of PS and OP is constructed, the efficiency and mechanism of activating PS to promote degradation are explored, and the method has important research significance and practical value.
Among all potential FeOOH carriers, textile fibers are of great interest because of their high stability, large specific surface area, ease of recycling, chemical modification and ease of interfacial control. Polyacrylonitrile fiber is used as a very mature synthetic fiber and is widely applied to textiles, buildings and people's daily life. Furthermore, PANF is rich in cyanide and ester groups, which can be easily converted into other functional groups. However, there are few reports of degradation and OP recovery of acrylic fibers using FeOOH loaded fibers. Therefore, it is theoretically possible to use polyacrylonitrile fibers as a carrier to support FeOOH to activate PS to degrade OP, which is of great significance.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides FeOOH functionalized acrylic fiber, a preparation method and application thereof, wherein the FeOOH functionalized acrylic fiber has the advantages of high adsorption efficiency, low treatment limit, good recycling, environmental friendliness, capability of simultaneously treating organic phosphorus and inorganic phosphorus in wastewater and the like.
In order to achieve the above object, the present invention provides the following technical solutions:
the preparation method of the FeOOH functionalized acrylic fiber is characterized by comprising the following steps of:
1) Synthetic aminated fiber PAN A F：
1.1 Uniformly mixing the dried polyacrylonitrile fiber, the polyethyleneimine and the deionized water in a reaction kettle, and then reacting for 6 hours at the reaction temperature of 140 ℃;
1.2 After the reaction is finished and cooled to room temperature, taking out the reactant, and repeatedly washing the reactant with deionized water at 70-80 ℃ until the pH value is neutral;
1.3 Placing the washed reactant in a baking oven at 60 ℃ for drying to obtain aminated fiber PAN A F；
2) FeOOH functionalized acrylic fiber PAN prepared by sol-gel method A F-FeOOH：
2.1 Preparation of Fe (OH) 3 Colloidal solution: drying Fe (NO) 3 ) 3 ·9H 2 O is dissolved in deionized water to form a mixed solution, then the mixed solution is dropped into boiling deionized water and stirred uniformly, and Fe (OH) is obtained after cooling to room temperature 3 A colloidal solution;
2.2 Taking dry aminated fiber PAN A F placing Fe (OH) 3 In the colloid solution, and fully stirring for 1 hour at room temperature;
2.3 Taking out the reactant after stirring, and drying the reactant in an oven at 105 ℃ for 6 hours to obtain FeOOH functionalized acrylic fiber PAN A F-FeOOH。
Preferably, in the step 1.1), the ratio of the polyacrylonitrile fiber, the polyethyleneimine and the deionized water is 1g:5g:20mL.
Preferably, in the step 2.1), the Fe (NO) 3 ) 3 ·9H 2 The ratio of O, deionized water and boiling deionized water was 4.04g:10mL:40mL。
Preferably, in said step 2.2), 100mg of said dried aminated fibers PAN are taken A F is put into Fe (OH) prepared in the step 2.1) 3 In a colloidal solution.
In addition, the invention also provides FeOOH functionalized acrylic fiber which is characterized by being prepared by adopting the preparation method.
The invention also provides a method for degrading organic phosphorus in wastewater by adopting the FeOOH functionalized acrylic fiber, which is characterized in that the FeOOH functionalized acrylic fiber is used for degrading the organic phosphorus in the wastewater.
Preferably, the concentration of phenylphosphonic acid is 5mg L -1 And the concentration of persulfate is 0.5mmolL -1 20mg of the FeOOH functionalized acrylic fiber was added to 50mL of wastewater to degrade the phenylphosphonic acid in the wastewater.
Preferably, the pH of the wastewater is adjusted to 5 prior to degradation.
The invention also provides a method for adsorbing inorganic phosphorus in wastewater by adopting the FeOOH functionalized acrylic fiber, which is characterized in that the FeOOH functionalized acrylic fiber is used for adsorbing inorganic phosphorus in the wastewater.
Preferably, the pH of the wastewater is adjusted to 7 prior to adsorption.
Compared with the prior art, the FeOOH functionalized acrylic fiber and the preparation method and application thereof have one or more of the following beneficial technical effects:
1. which significantly improves the phosphate removal rate.
2. The adsorption selectivity of the catalyst to phosphate is good, and the catalyst is not influenced by other coexisting anions.
3. The method can be recycled and has high recycling property.
4. The pH value of the water-soluble phosphate remover is high, phosphate can be removed at room temperature, and the water-soluble phosphate remover is very simple and convenient to use.
5. The method can degrade the organic phosphorus in the wastewater, and effectively solves the problem that the organic phosphorus in the wastewater is difficult to recycle.
Drawings
FIG. 1 is a schematic illustration of the process for making FeOOH functionalized acrylic fiber of the present invention.
Figure 2a shows the effect of FeOOH functionalized acrylic fiber usage on organophosphorus degradation.
Figure 2b shows the effect of persulfate concentration on organophosphorus degradation.
Fig. 3 shows the effect of pH on organophosphorus degradation.
Figure 4 shows the effect of reaction time and temperature on organophosphorus degradation.
Fig. 5 shows the effect of coexisting ions on organophosphorus degradation.
Figure 6 shows the cyclic performance of FeOOH functionalized acrylic fiber to degrade organic phosphorus.
Fig. 7 shows the effect of pH on inorganic phosphorus adsorption.
Fig. 8 shows the effect of reaction time and temperature on inorganic phosphorus adsorption.
Fig. 9 shows the effect of initial phosphate concentration on inorganic phosphorus adsorption.
Fig. 10 shows the effect of coexisting ions on inorganic phosphorus adsorption.
Fig. 11 shows the phosphate solution penetration curve in a continuous flow experiment.
Fig. 12 shows the cycle performance of FeOOH functionalized acrylic fiber to adsorb inorganic phosphorus.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings, which are not to be construed as limiting the scope of the invention.
The invention relates to FeOOH functionalized acrylic fiber and a preparation method and application thereof, and the FeOOH functionalized acrylic fiber has the advantages of high adsorption efficiency, low treatment limit, good recycling, environment friendliness, capability of simultaneously treating organic phosphorus and inorganic phosphorus in wastewater and the like.
Fig. 1 shows a schematic diagram of the process for preparing FeOOH functionalized acrylic fiber of the present invention. As shown in fig. 1, the FeOOH functionalized acrylic fiber of the present invention is synthesized by a two-step method, and the specific preparation method thereof comprises the following steps:
1. synthesis of aminated PANs A F。
Dried polyacrylonitrile fiber (PANF, 1.0 g) and polyethylenimine (PEI, 5.0 g) were dissolved in a reaction kettle containing 20mL of deionized water, and then reacted at 140℃for 6 hours. After the reaction, the fibers were removed with forceps and repeatedly washed with deionized water (70-80 ℃) several times until the pH was neutral. The washed fibers were dried overnight in an oven at 60 ℃ to obtain aminated PAN A F. Wherein aminated PANs synthesized using such conditions A F increased in weight by about 38% (relative to PANF).
2. FeOOH functionalized acrylic fiber PAN prepared by sol-gel method A F-FeOOH。
First, fe (OH) is prepared 3 Colloidal solution: 4.04g of dry Fe (NO) 3 ) 3 ·9H 2 O was dissolved in 10mL of deionized water, and then dropped into 40mL of boiling deionized water using a dropping funnel with vigorous stirring. After cooling at room temperature, fe (OH) is obtained 3 Colloidal solution.
Then weigh the dried 100mg aminated PAN A F and placing the Fe (OH) obtained above 3 In the colloidal solution and stirred well at room temperature for 1 hour. Finally, filtering the fiber and placing the fiber in an oven at 105 ℃ for 6 hours at high temperature to obtain FeOOH functionalized acrylic fiber PAN A F-FeOOH。
The FeOOH functionalized acrylic fiber prepared by the preparation method is verified in various ways such as experiments.
The specific experimental mode adopted by the invention is firstly described as follows:
1. and (3) an organophosphorus degradation experiment.
Batch degradation experiments of phenylphosphonic acid (PPOA) were performed in 100mL glass bottles at a temperature of 25 ℃. Specifically, will contain 5mg L -1 PPOA and 0.5mmolL -1 The initial pH of the 50mL mixed solution of Persulfate (PS) was adjusted to the desired value by 0.1. 0.1M H 2 SO 4 And 0.1M NaOH conditioning. Subsequently, 30mg of dry PAN was weighed out A F-FeOOH is placed in the mixed solution and stirred. And sampling at regular intervalsImmediately after 1mL of sample solution, filtration was performed using a 0.22 μm syringe. To stop the reaction, the filtrate was immediately mixed with 1mL of methanol for quenching and the concentration of the remaining PPOA solution was determined. At the same time, the initial pH value (3-9) and the coexisting anions (Cl) were also studied - 、NO 3 - 、HCO 3 - And CO 3 2- ) Influence parameters on the PPOA removal. Furthermore, PAN was evaluated by five cycles A The F-FeOOH catalyzes the stability and usefulness of the organophosphorus degradation process.
2. And (3) inorganic phosphorus adsorption experiments.
Batch adsorption experiments of inorganic salts were performed in 20mL glass bottles. KH is carried out 2 PO 4 The initial pH of the solution was adjusted to the desired value by adjusting the pH to 0.1. 0.1M H 2 SO 4 And 0.1M NaOH conditioning. Then 10mg of dry PAN was weighed out A F-FeOOH was stirred in the above solution until the adsorption equilibrium was reached, and the residual phosphate concentration was measured. Meanwhile, various influencing parameters such as initial pH value (3-9), different time (0-120 min), different temperature, different phosphate concentration, anion coexistence and the like are also studied. Finally, PAN was evaluated by continuous flow and cyclic experiments A Stability and practicality of F-FeOOH.
The extent of influence of various influencing factors during a specific experiment is described in detail below.
1. Organophosphorus degradation experiment
The method is characterized in that phenylphosphonic acid is used as a representative, the method is not limited to the organic phosphorus, other organic phosphorus can be subjected to an organic phosphorus degradation experiment to analyze the influence degree of various influence factors, and thus the optimal preparation condition and degradation condition can be obtained.
1. FeOOH functionalized acrylic fiber PAN A The amount of F-FeOOH and the concentration of Persulfates (PS) affect the degradation of the organic phosphorus.
Under the given reaction conditions described above, the effect of the amount of fiber on the degradation of the organic phosphorus was investigated. As shown in fig. 2a, when the amount of the fiber is less than 10mg, the degradation rate increases as the amount of the fiber increases, and when the amount of the fiber is 20mg, the degradation rate reaches 90% or more, and thus 20mg of the fiber is the optimum amount.
In addition, the effect of persulfate concentration on organophosphorus degradation was investigated. As shown in FIG. 2b, the concentration of persulfate is in the range of 0.1 to 0.5mmol L -1 The best degradation effect is achieved, and the preferred amount of the catalyst is 0.5mmol L in the invention -1 。
2. The pH of the reaction system is affected.
The effect of initial pH (3-9) on PPOA removal was studied and the results are shown in FIG. 3. As can be seen from FIG. 3, the catalytic effect is best at pH 5.
3. The effect of reaction time and temperature.
Study on FeOOH functionalized acrylic fiber PAN at different temperatures A The degradation kinetics of F-FeOOH on organophosphorus PPOA is shown in FIG. 4. As can be seen from FIG. 4, the higher the reaction temperature of the system is, the faster the degradation rate is, and the degradation efficiency is more than 90% at room temperature for 1.5 hours. Therefore, the FeOOH functionalized acrylic fiber PAN of the invention A F-FeOOH can be used for efficiently removing organic phosphorus at room temperature.
4. Coexisting ion effects.
Co-existing anions (Cl) - 、NO 3 - 、HCO 3 - And CO 3 2- ) The effect on PPOA removal is shown in figure 5. As can be seen from FIG. 5, common NO 3 - 、HCO 3 - And CO 3 2- The plasma effect is negligible, whereas Cl - Is relatively large if Cl - The content is higher, the degradation efficiency is affected, and the degradation can still reach more than 30 percent.
5. Circulation capacity
After the degradation reaction is finished, taking out the FeOOH functionalized acrylic fiber by using tweezers, flushing the FeOOH functionalized acrylic fiber by using ethanol and deionized water, and filtering the FeOOH functionalized acrylic fiber cleanly by suction, and directly using the FeOOH functionalized acrylic fiber for another degradation. The result of this cycle is shown in FIG. 6. As can be seen from fig. 6, the degradation of the organic phosphorus by the first 3 times of fibers is not reduced, and after 5 times of circulation, the catalytic capacity of the fibers is reduced to 80%, and the overall circulation capacity is better.
2. Inorganic phosphorus adsorption experiment
By KH 2 PO 4 Is representative, not limited to this inorganic phosphorus, other inorganicPhosphorus can also be subjected to an adsorption experiment of inorganic phosphorus to analyze the influence degree of various influence factors, thereby obtaining optimal preparation conditions and adsorption conditions.
1. The pH of the reaction system is affected.
In practical wastewater, the pH application range of the adsorbent is also an important aspect due to the complex components. Thus, at an initial pH of 3-9, PAN was measured A The adsorption capacity of F-FeOOH to phosphate is shown in FIG. 7. The results indicate that PAN A The phosphate adsorption capacity of F-FeOOH increases rapidly as the pH increases from 3 to 7 and reaches a maximum at ph=7. At alkaline pH values (8-9), the adsorption capacity of phosphate is slightly reduced, but still higher. This phenomenon may be related to the dissociation equilibrium of phosphate.
According to the relationship between the distribution of phosphate species and pH, when pH=2-3, the phosphate is mostly represented by H 3 PO 4 Is present in the form of (c). However, H 3 PO 4 Cannot be effectively adsorbed on PAN through electrostatic interaction A The surface of F-FeOOH results in a relatively low phosphate adsorption capacity at low pH values. When the pH value is 3-7, H 2 PO 4 - And HPO 4 2- Is the main form of phosphate, which is readily available from PAN A The iron sites on the F-FeOOH surface are adsorbed by electrostatic attraction interactions. The main reasons for the decrease in phosphate adsorption at pH 8-9 are two: firstly, PAN under alkaline condition A The surface of F-FeOOH has excessive negative charge, so that electrostatic repulsive force is enhanced; second, phosphate and hydroxide ions (OH-) compete for PAN A Adsorption sites on the F-FeOOH surface result in a decrease in the adsorption capacity of phosphate.
2. The effect of reaction time and temperature.
As shown in FIG. 8, a PAN was studied A Adsorption capacity of F-FeOOH over time for phosphate at different temperatures (288K, 298K, 308K). It can be seen that the three curves have approximately the same trend, the adsorption speed is high in the first 20min, the adsorption speed is low after 30min, and the adsorption balance is achieved. This indicates that, initially, exposure to the PAN A Most of the living F-FeOOH surfacesThe sex sites can rapidly capture phosphate in water. Over time, PAN A The active sites of F-FeOOH are gradually occupied to reduce adsorption efficiency until saturated adsorption is reached. .
It is worth mentioning that PAN is compared with other dephosphorization composite materials in the prior art A The dephosphorization efficiency of F-FeOOH is advantageous. For example, the bentonite is modified by magnesium hydroxide (120 min), the beta-FeOOH nano material is coated on basalt fiber (12 h), fe (III) modified biochar (24 h), lanthanum modified magnetic oyster shell (24 h) and the like. Thus, PAN A F-FeOOH has higher efficiency and potential application value as dephosphorization adsorbent.
3. Influence of initial phosphate concentration.
As shown in fig. 9, PAN A The adsorption capacity of F-FeOOH for phosphate increases with the initial concentration of phosphate until adsorption saturation is reached. This is probably due to the fact that at lower concentrations there are more coordination sites for phosphorus and that the active adsorption sites become saturated by adsorption as the phosphorus concentration increases.
4. Influence of coexisting ions.
Due to the presence of various anions (Cl) in the wastewater - ，NO 3 - ，CO 3 2- And SO 4 2- ) The adsorption of phosphate by the adsorbent is thus affected. To verify PAN A F-FeOOH selectivity for phosphate adsorption, PAN was determined A Adsorption of phosphate by F-FeOOH in the presence of coexisting ions. As shown in FIG. 10, cl - ，NO 3 - And CO 3 2- The presence of (2) has little effect on phosphate adsorption, indicating PAN A F-FeOOH has certain anti-interference capability. However, SO 4 2- The presence of (2) significantly inhibits the phosphate adsorption capacity of the adsorbent, possibly due to SO 4 2- And Fe in PAN A The F-FeOOH surface has strong affinity and can compete with phosphate for its adsorption sites, thereby inhibiting its adsorption to phosphate. Nonetheless, PANs A F-FeOOH in SO 4 2- Still having adsorption capacity for phosphate in the presence. This indicates a PAN A F-FeOOH can be selectively removedThe phosphate in the polyanion actual water has strong practical application capability.
5. Continuous flow experiments.
To verify PAN A The practical application capability of F-FeOOH was tested in a continuous flow. Phosphate penetration curves were plotted as shown in fig. 11. It was found that the concentration of phosphate effluent gradually increased as its volume increased. When the liquid volume is less than 280mL, the phosphate removal rate can be maintained above 95%. The results indicate that PAN A F-FeOOH can effectively purify phosphate under continuous flow. In addition, the fibers are easily woven, can be woven into any shape, and are placed in the waste water pipeline to purify phosphate in the waste water. Thus, PAN A F-FeOOH has strong practical application potential as a dephosphorization adsorbent.
6. Reusability of the adsorbent.
To explore PAN A Regeneration Capacity of F-FeOOH as dephosphorization adsorbent, phosphate adsorption saturated PAN was eluted with 0.05mol/L NaOH solution for 1h A F-FeOOH. As shown in fig. 12, PAN A The phosphate removal rate of F-FeOOH decreased slightly after 5 cycles, but remained at a high dephosphorization level above 88%. The results show that the adsorbent has good stability and reusability.
The above examples of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. Not all embodiments are exhaustive. All obvious changes or modifications which come within the spirit of the invention are desired to be protected.

Claims (2)

1. The method for degrading the organic phosphorus in the wastewater by adopting the FeOOH functionalized acrylic fiber is characterized by comprising the following steps of:
1) Synthetic aminated fiber PAN A F：
1.1 Uniformly mixing the dried polyacrylonitrile fiber, the polyethyleneimine and the deionized water in a reaction kettle, and then reacting for 6 hours at the reaction temperature of 140 ℃; wherein the ratio of the polyacrylonitrile fiber to the polyethyleneimine to the deionized water is 1g:5g:20 mL;
1.2 After the reaction is finished and cooled to room temperature, taking out the reactant, and repeatedly washing the reactant with deionized water at 70-80 ℃ until the pH value is neutral;
1.3 Placing the washed reactant in a baking oven at 60 ℃ for drying to obtain aminated fiber PAN A F；
2) FeOOH functionalized acrylic fiber PAN prepared by sol-gel method A F-FeOOH：
2.1 Preparation of Fe (OH) 3 Colloidal solution: drying Fe (NO) 3 ) 3 ·9H 2 O is dissolved in deionized water to form a mixed solution, then the mixed solution is dropped into boiling deionized water and stirred uniformly, and Fe (OH) is obtained after cooling to room temperature 3 A colloidal solution; wherein the Fe (NO) 3 ) 3 ·9H 2 The ratio of O, deionized water and boiling deionized water was 4.04g:10mL:40mL;
2.2 Taking dry aminated fiber PAN A F placing Fe (OH) 3 In the colloid solution, and fully stirring for 1 hour at room temperature; wherein 100mg of the dried aminated fiber PAN is taken A F is put into Fe (OH) prepared in the step 2.1) 3 The colloid solution is added;
2.3 Taking out the reactant after stirring, and drying the reactant in an oven at 105 ℃ for 6 hours to obtain FeOOH functionalized acrylic fiber PAN A F-FeOOH；
Wherein the concentration of phenylphosphonic acid is 5mg L -1 And the concentration of persulfate was 0.5mmol L -1 20mg of the FeOOH functionalized acrylic fiber was added to 50mL of wastewater to degrade the phenylphosphonic acid in the wastewater.
2. The method of claim 1, wherein the pH of the wastewater is adjusted to 5 prior to degradation.
CN202210901091.0A 2022-07-28 2022-07-28 FeOOH functionalized acrylic fiber and preparation method and application thereof Active CN115155537B (en)

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