CN103551121A - Adsorbing material prepared from waste straws and capable of adsorbing trivalent arsenic from water as well as preparation method and application thereof - Google Patents
Adsorbing material prepared from waste straws and capable of adsorbing trivalent arsenic from water as well as preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses an adsorbing material prepared from waste straws and capable of adsorbing trivalent arsenic from water as well as a preparation method and an application thereof, and belongs to the field of synthesis and application of environment functional materials. The adsorbing material is prepared by using the waste straws as matrixes through one-step quaternary ammoniated reaction. The preparation method is simple and the sources of the raw materials are wide; the prepared adsorbing material is capable of effectively adsorbing and removing the trivalent arsenic out of water; after adsorption, the trivalent arsenic in the adsorbing material can be desorbed by using a sodium chloride or sodium hydroxide solution; and the adsorbing material regenerated after desorption has stable arsenic adsorption property. The adsorbing material prepared by the method is an effective way of the resource utilization of the waste straws in farmlands.
Description
Technical field:
The invention discloses trivalent arsenic sorbing material and preparation method thereof in a kind of adsorbable water, say that more specifically the discarded straw of a kind of utilization is for arsenious sorbing material and its preparation method and application in adsorbable water.
Background technology:
Trivalent arsenic is very harmful to health and ecological environment, how efficiently to remove the study hotspot that trivalent arsenic in water becomes water pollution control field.The bigger serface that absorption method utilizes adsorbent to provide, reaches the object that purifies arsenic removal by affinity stronger between arsenic pollutant and adsorbent.The arsenic of absorption method because simple to operate, operational effect is stable, in recoverable wastewater, environment is not produced to secondary pollution, and sorbing material wide material sources, cheap, reusable extremely people pay close attention to, conventional sorbing material mainly contains active carbon, metals/minerals matter, artificial synthetic macromolecule resin, composite organic-inorganic material at present.But there is more area for improvement in above-mentioned sorbing material in actual use: 1) active carbon adsorption material adsorption capacity is lower, and while processing high concentration containing arsenic sewage, service life is shorter; 2) metals/minerals matter sorbing material is as activated alumina, Zero-valent Iron etc., and its cost is higher, is not suitable for extensive; 3) although artificial synthetic macromolecule resin material adsorption capacity is large, but conventionally need to first synthesize macromolecule matrix, then by surface grafting group or carried metal, therefore preparation process is comparatively complicated, and cost is also higher, lack economy, and also difficult degraded of macromolecule resin material itself, when exhaust service life, need to carry out safe disposal.
On the other hand, China is large agricultural country, agricultural waste material---stalk resource is extremely abundant.In stalk, contain a large amount of celluloses, compare with synthetic macromolecule, cellulose have fully biodegradable, nontoxic, pollution-free, be easy to modification, good biocompatibility, the advantage such as renewable, be considered to the primary raw material of the future world energy, chemical industry.Cellulosic structure contains many hydrophilic oh groups, a series of derivative reactions such as the esterification by hydroxyl, etherificate, graft copolymerization, can carry out modification to it, in molecule, introduce the functional group with specific absorption property, can prepare natural polymer adsorbing material.The present invention carries out modification to it on the basis of agricultural crop straw, makes it with quaternary amines, realizes synthesizing new trivalent arsenic sorbing material.
Summary of the invention:
1, the technical problem that invention will solve
The deficiency existing for the sorbing material of existing bibliographical information: 1) active carbon adsorption material adsorption capacity is lower, while processing high concentration containing arsenic sewage, service life is shorter; 2) metals/minerals matter sorbing material is as activated alumina, Zero-valent Iron etc., and its cost is higher, is not suitable for extensive; 3) although artificial synthetic macromolecule resin material adsorption capacity is large, but conventionally need to first synthesize macromolecule matrix, then by surface grafting group or carried metal, therefore preparation process is comparatively complicated, and cost is also higher, lack economy, and also difficult degraded of macromolecule resin material itself, when exhaust service life, need to carry out safe disposal; 4) the existing raw material that utilizes string to prepare sorbing material mostly is bagasse, natural fiber crops, cotton fiber etc., phosphate radical, nitrate ion and heavy metal ion in main Adsorption water, and in building-up process, need to add sweller, catalyst, grafted monomers, amination reagent etc., aminating reaction process is complicated, and the rate of recovery is low.Although there is in recent years scholar's research to prepare cellulose sorbing material, removed in water arsenic and fluorine ion (for removing cellulose base sorbing material of water arsenic and fluorine ion and preparation method thereof, China Patent Publication No. CN102139202A), but the method preparation condition is harsh, and the alkalescent group (primary amine of grafting, secondary amine group) can only be in neutrality or the lower generation of acid condition (as pH1～9) suction-operated, and adsorbance is the remarkable [Li Buhai that declines along with the increase of pH, Li Linjing, Sun little Mei, the research [J] of ethylenediamine modified peanut powder adsorpting anion dyestuff. Journal of SCUN (natural science edition), 2011, 30 (3): 20-24].In addition, the adsorption capacity of cellulose base sorbing material prepared by the method is lower, not obvious to the arsenious removal effect of high concentration.
The invention provides the discarded straw of a kind of utilization for arsenious sorbing material and its preparation method and application in adsorbable water, take and discard stalk as matrix, after simple pretreatment, by a step quaternary ammonium reaction, can make novel absorption material, effectively trivalent arsenic in Adsorption water.Adsorb saturated after, can to it, carry out desorption and regeneration with sodium hydroxide solution or sodium chloride solution, and the sorbing material absorption property after desorption and regeneration does not decline.This is invented, and not only reaction raw materials is easy to get, synthesis step is simple, and than alkalescent group, the quaternary ammonium group of load can go out OH-and be strong basicity at dissociation in water, under different pH, can work, on adsorbance, not quite [Huang Xiaodong ，Xu state admires in impact, Lou Benyong, the research [J] of Quaternary Ammonium Salt of Chitosan film to neopelex absorption in water body. Environmental science and technology, 2012,35 (11): 65-69].In addition, the adsorbance of this material is far away higher than other allied fiber element adsorbing materials, and to the arsenious removal of high concentration, for example the processing of sudden trivalent arsenic contamination accident exists huge advantage.
2, technical scheme
The discarded straw of a kind of utilization provided by the invention is for arsenious sorbing material in adsorbable water, through pretreatment, quaternary ammonium reaction, be prepared from, be cellulose [the Runcang Sun of straw, J.M.Lawther, W.B.Banks, A tentative chemical structure of wheat straw lignin (progress of wheat stalk lignin structure model) [J] .Industrial Crops and Products(agricultural industry and product) 1997, (6): 1-8.] be matrix, be modified with quaternary ammonium salt group above, its basic structure formula is as follows:
Described sorbing material nitrogen content is 1-2%; Water absorption rate is 5-6 times.
Discarded straw is for an arsenious sorbing material preparation method in adsorbable water, and its preparation process is as follows:
The steps include:
(1) discarded stalk pretreatment
To discard stalk (Waste Straw, hereinafter to be referred as WS) and clean with distilled water, 40-60 ℃ of oven dry, is cut into the segment about 0.5-0.8mm, then puts it into 1-5%Na
2cO
3in the mixed liquor of 1-5%NaCl, ultrasonic cleaning 2-3h.After taking-up, with distilled water, clean 40-60 ℃ of dry for standby.
(2) quaternary ammonium reaction
To put into three-neck flask through pretreated Wheat Straw, add the mass concentration 50-80%Quat188 aqueous solution (3-chloro-2-hydroxypropyl-trimethyl ammonium chloride, be called for short Quat188, CAS 3327-22-8), 3-5M sodium hydroxide solution, 70-80 ℃ of heating water bath 12-16h, cold filtration, with distilled water, be washed till neutrality, 40-60 ℃ of vacuum drying, obtains the stalk material (hereinafter referred WS-N) that quaternary amine is modified, and can be used for arsenic-adsorbing (III).Stalk quality g:Quat188ml wherein: sodium hydroxide solution ml=1:15-20:15.
Described stalk is selected from a kind of in straw, wheat straw, maize straw, soybean stalk, cotton stalk or sweet potato vine.
3, beneficial effect
The invention provides the discarded straw of a kind of utilization for arsenious sorbing material and its preparation method and application in adsorbable water, with respect to prior art, there is following novelty and advantage:
(1) synthetic method innovation: take and discard stalk and prepare sorbing material as matrix, raw material sources are extensive, and the recycling for discarded stalk provides effective way simultaneously; Employing Quat188 is quaternary ammonium reagent, through a step quaternary ammonium reaction, can make sorbing material, and step is simple;
(2) product advantage: sorbing material prepared by the present invention is arsenic (III) in adsorbed water effectively, and adsorbance far above the tradition of other documents and patent report natural/artificial synthetic sorbing material (in Table different natural materials in 1-document as the adsorbent of matrix to arsenious adsorbance); The sorbing material of preparation is not containing heavy metal ion (as iron ion, aluminium ion), and the problem that does not therefore exist heavy metal ion to run off, is difficult for causing secondary pollution; Quaternary amine group on the sorbing material of preparation can not run off because of current scour, stable to arsenious absorption property.
The different natural materials of table 1 bibliographical information as the adsorbent of matrix to arsenious adsorbance
(3) sorbing material after desorption and regeneration is stable to the absorption property of arsenic.
Accompanying drawing explanation
The structural formula figure of the sorbing material WS-N of preparation in Fig. 1 embodiment 1.
The solid-state nuclear magnetic resonance spectrogram of the sorbing material WS-N of preparation in Fig. 2 embodiment 2
13cNMR and characteristic of correspondence peak structure, abscissa representative
13the chemical shift of C, ordinate represents intensity.
(left figure amplifies 5000 times to the sorbing material WS-N scanning electron microscope (SEM) photograph of preparation in Fig. 3 embodiment 2, and the particle that part surface covers is the quaternary amine structure in load; Right figure amplifies 500 times, presents filamentary structure clearly).
The XPS analysis figure of the sorbing material WS-N of preparation in Fig. 4 embodiment 3, abscissa represents that ordinate represents absorption intensity in conjunction with energy.As seen from the figure, N1s orbital electron represents that at the absworption peak of locating in conjunction with energy 399.5eV (± 0.1eV) stalk material after modification has C-N structure, proves that the quaternary ammonium moiety of Quat188 has been grafted on stalk effectively.
The sorbing material WS-N adsorption test adsorption isotherm of preparation in Fig. 5 embodiment 1.
The sorbing material WS-N adsorption test adsorption isotherm of preparation in Fig. 6 embodiment 2.
The sorbing material WS-N adsorption test adsorption isotherm of preparation in Fig. 7 embodiment 3.
The sorbing material WS-N adsorption test adsorption isotherm of preparation in Fig. 8 embodiment 4.
The sorbing material WS-N adsorption test adsorption isotherm of preparation in Fig. 9 embodiment 5.
The sorbing material WS-N adsorption test adsorption isotherm of preparation in Figure 10 embodiment 6.
The sorbing material WS-N adsorption test adsorption isotherm of preparation in Figure 11 embodiment 7.
The sorbing material WS-N adsorption test adsorption isotherm of preparation in Figure 12 embodiment 8.
The specific embodiment
(1) pretreatment of stalk
Wheat Straw (WS) is cleaned with distilled water, and 60 ℃ of oven dry, are cut into the segment about 0.5-0.8mm, then put it into 1%Na
2cO
3in the mixed liquor of 1%NaCl, ultrasonic cleaning 2h.After taking-up, with distilled water, clean 60 ℃ of dry for standby.
(2) quaternary ammonium reaction
2g Wheat Straw is put into three-neck flask, add 30mL Quat188 (mass concentration 50% aqueous solution), 30mL3M sodium hydroxide solution, 80 ℃ of heating water bath 12h, cold filtration, with distilled water, be washed till neutrality, 60 ℃ of vacuum drying, obtain the Wheat Straw material WS-N that quaternary amine is modified, can be used for arsenic-adsorbing (III), the structural formula figure of WS-N is illustrated in fig. 1 shown below:
Its physicochemical property is as follows:
| Nitrogen content (%) | Water absorption rate (mass ratio) |
| 1.42 | 5.73 |
(3) static balancing adsorption test
In 5 conical flasks, add respectively 0.05g WS-N stalk, in each conical flask, add respectively that 50ml initial concentration is 10,20,30,40, arsenic (III) solution of 50mg/L, in 20 ℃ of shaking tables, vibrate after 2 hours, measure in solution and remain arsenic concentration, and the following formula calculated equilibrium adsorbance of foundation:
Equilibrium adsorption capacity=[solution arsenic (III) concentration during initial soln arsenic (III) concentration-adsorption equilibrium] * liquor capacity/stalk quality;
Take solution equilibria concentration as X-axis, and equilibrium adsorption capacity is Y-axis, makes adsorption isotherm as shown in Figure 5: to the maximum equilibrium adsorption capacity 34.58mg/g of arsenic (III).
(4) adsorption-desorption experiment
In conical flask, add 0.05g WS-N stalk, then add arsenic (III) solution of 50ml initial concentration 50mg/L, in 20 ℃ of shaking tables, vibrate after 2 hours, measure in solution and remain arsenic concentration, calculated equilibrium adsorbance.Then by deionized water, wash WS-N, then to add 10ml mass concentration be 4% sodium hydroxide solution, in 20 ℃ of shaking tables, vibrate 20 minutes, with deionized water washing, carry out adsorption experiment for the second time.Repeat continuously 10 batches of adsorption-desorption experimental results as follows:
| Batch | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Adsorbance (mg/L) | 34.58 | 33.69 | 34.23 | 35.91 | 33.75 | 32.83 | 31.67 | 33.55 | 32.13 | 33.55 |
Embodiment 2
(1) pretreatment of stalk
Rice straw (WS) is cleaned with distilled water, and 60 ℃ of oven dry, are cut into the segment about 0.5-0.8mm, then put it into 2%Na
2cO
3in the mixed liquor of 2%NaCl, ultrasonic cleaning 3h.After taking-up, with distilled water, clean 50 ℃ of dry for standby.
(2) quaternary ammonium reaction
2g rice straw is put into three-neck flask, add 34mL Quat188 (mass concentration 60% aqueous solution), 30mL4M sodium hydroxide solution, 75 ℃ of heating water bath 14h, cold filtration, with distilled water, be washed till neutrality, 40 ℃ of vacuum drying, its physicochemical property of rice straw material WS-N that obtains quaternary amine modification is as follows:
| Nitrogen content (%) | Water absorption rate (mass ratio) |
| 1.55 | 5.82 |
Fig. 2 is the solid-state nuclear magnetic resonance spectrogram of the sorbing material WS-N of preparation in embodiment 2
13cNMR and characteristic of correspondence peak structure, abscissa representative
13the chemical shift of C, ordinate represents intensity.
Fig. 3 is that (left figure amplifies 5000 times to the sorbing material WS-N scanning electron microscope (SEM) photograph of preparing in embodiment 2, and the particle that part surface covers is the quaternary amine structure in load; Right figure amplifies 500 times, presents filamentary structure clearly).
(3) static adsorption equilibria test
Method, with example 1, is made adsorption isotherm as shown in Figure 6: to the maximum equilibrium adsorption capacity 34.80mg/g of arsenic (III).
(4) adsorption-desorption experiment
Method, with example 1, repeats 10 batches of adsorption-desorption experimental results as follows continuously.
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Adsorbance (mg/L) | 34.31 | 32.55 | 34.73 | 34.91 | 33.56 | 33.51 | 32.16 | 34.05 | 31.53 | 34.29 |
Embodiment 3
(1) pretreatment of stalk
Maize straw (WS) is cleaned with distilled water, and 60 ℃ of oven dry, are cut into the segment about 0.5-0.8mm, then put it into 3%Na
2cO
3in the mixed liquor of 3%NaCl, ultrasonic cleaning 2.5h.After taking-up, with distilled water, clean 40 ℃ of dry for standby.
(2) quaternary ammonium reaction
2g maize straw is put into three-neck flask, add 36mL Quat188 (70% aqueous solution), 30mL5M sodium hydroxide solution, 70 ℃ of heating water bath 16h, cold filtration, with distilled water, be washed till neutrality, 50 ℃ of vacuum drying, obtain the maize straw material WS-N that quaternary amine is modified, can be used for arsenic-adsorbing (III), its physicochemical property is as follows:
| Nitrogen content (%) | Water absorption rate (mass ratio) |
| 1.65 | 5.61 |
Fig. 4 is the XPS analysis figure of the sorbing material WS-N of preparation in embodiment 3, and abscissa represents that ordinate represents absorption intensity in conjunction with energy.As seen from the figure, N1s orbital electron represents that at the absworption peak of locating in conjunction with energy 399.5eV (± 0.1eV) stalk material after modification has C-N structure, proves that the quaternary ammonium moiety of Quat188 has been grafted on stalk effectively.
(3) static balancing adsorption test
Method, with example 1, is made adsorption isotherm as shown in Figure 7: to the maximum equilibrium adsorption capacity 35.22mg/g of arsenic (III).
(4) adsorption-desorption experiment
Method, with example 1, repeats 10 batches of adsorption-desorption experimental results as follows continuously.
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Adsorbance (mg/L) | 34.66 | 33.21 | 34.03 | 35.21 | 34.06 | 33.28 | 33.57 | 33.68 | 32.44 | 34.98 |
Embodiment 4
(1) pretreatment of stalk
Soybean stalk (WS) is cleaned with distilled water, and 50 ℃ of oven dry, are cut into the segment about 0.5-0.8mm, then put it into 4%Na
2cO
3in the mixed liquor of 4%NaCl, ultrasonic cleaning 2h.After taking-up, with distilled water, clean 60 ℃ of dry for standby.
(2) quaternary ammonium reaction
2g soybean stalk is put into three-neck flask, add 40mL Quat188 (80% aqueous solution), 30mL5M sodium hydroxide solution, 70 ℃ of heating water bath 14h, cold filtration, with distilled water, be washed till neutrality, 60 ℃ of vacuum drying, obtain the soybean stalk material WS-N that quaternary amine is modified, can be used for arsenic-adsorbing (III), its physicochemical property is as follows:
| Nitrogen content (%) | Water absorption rate (mass ratio) |
| 1.79 | 5.88 |
(3) static balancing adsorption test
Method, with example 1, is made adsorption isotherm as shown in Figure 8: to the maximum equilibrium adsorption capacity 35.71mg/g of arsenic (III).
(4) adsorption-desorption experiment
Method, with example 1, repeats 10 batches of adsorption-desorption experimental results as follows continuously.
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Adsorbance (mg/L) | 34.95 | 33.27 | 33.15 | 34.22 | 34.18 | 33.73 | 33.32 | 33.59 | 32.66 | 34.58 |
(1) pretreatment of stalk
Cotton stalk (WS) is cleaned with distilled water, and 40 ℃ of oven dry, are cut into the segment about 0.5-0.8mm, then put it into 5%Na
2cO
3in the mixed liquor of 5%NaCl, ultrasonic cleaning 3h.After taking-up, with distilled water, clean 45 ℃ of dry for standby.
(2) quaternary ammonium reaction
2g cotton stalk is put into three-neck flask, add 35mL Quat188 (mass concentration 70% aqueous solution), 30mL4M sodium hydroxide solution, 80 ℃ of heating water bath 15h, cold filtration, with distilled water, be washed till neutrality, 50 ℃ of vacuum drying, obtain the cotton stalk material WS-N that quaternary amine is modified, can be used for arsenic-adsorbing (III), its physicochemical property is as follows:
| Nitrogen content (%) | Water absorption rate (mass ratio) |
| 1.87 | 5.23 |
(3) static balancing adsorption test
Method, with example 1, is made adsorption isotherm as shown in Figure 9: to the maximum equilibrium adsorption capacity 35.14mg/g of arsenic (III).
(4) adsorption-desorption experiment
Method, with example 1, repeats 10 batches of adsorption-desorption experimental results as follows continuously.
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Adsorbance (mg/L) | 33.92 | 33.17 | 33.59 | 33.78 | 33.49 | 34.17 | 33.56 | 34.55 | 33.95 | 33.58 |
Embodiment 6
(1) pretreatment of stalk
2g sweet potato vine stalk (WS) is cleaned with distilled water, and 50 ℃ of oven dry, are cut into the segment about 0.5-0.8mm, then put it into 2%Na
2cO
3in the mixed liquor of 2%NaCl, ultrasonic cleaning 2h.After taking-up, with distilled water, clean 60 ℃ of dry for standby.
(2) quaternary ammonium reaction
2g sweet potato vine is put into three-neck flask, add 30mL Quat188 (mass concentration 65% aqueous solution), 30mL4M sodium hydroxide solution, 80 ℃ of heating water bath 13h, cold filtration, with distilled water, be washed till neutrality, 40 ℃ of vacuum drying, obtain the sweet potato vine material WS-N that quaternary amine is modified, can be used for arsenic-adsorbing (III), its physicochemical property is as follows:
| Nitrogen content (%) | Water absorption rate (mass ratio) |
| 1.69 | 5.44 |
(3) static balancing adsorption test
Method, with example 1, is made adsorption isotherm as shown in figure 10: to the maximum equilibrium adsorption capacity 36.17mg/g of arsenic (III).
(4) adsorption-desorption experiment
Method, with example 1, repeats 10 batches of adsorption-desorption experimental results as follows continuously.
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Adsorbance (mg/L) | 35.98 | 35.55 | 35.73 | 34.44 | 34.32 | 34.16 | 33.24 | 34.35 | 33.38 | 35.48 |
Embodiment 7
(1) take Wheat Straw as reactive matrix, the pretreatment of stalk is with example 1.
(2) quaternary ammonium reaction
2g Wheat Straw is put into three-neck flask, add 28mL Quat188 (mass concentration 65% aqueous solution), 30mL4M sodium hydroxide solution, 75 ℃ of heating water bath 13h, cold filtration, with distilled water, be washed till neutrality, 50 ℃ of vacuum drying, obtain the Wheat Straw material WS-N that quaternary amine is modified, can be used for arsenic-adsorbing (III), its physicochemical property is as follows:
| Nitrogen content (%) | Water absorption rate (mass ratio) |
| 1.72 | 5.39 |
(3) static balancing adsorption test
Side's (4) adsorption-desorption experiment
Method, with example 1, repeats 10 batches of adsorption-desorption experimental results as follows continuously.
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Adsorbance (mg/L) | 35.05 | 33.22 | 34.39 | 34.49 | 34.67 | 33.25 | 34.66 | 34.73 | 32.38 | 35.02 |
Method, with example 1, is made adsorption isotherm as shown in figure 11: to the maximum equilibrium adsorption capacity 36.02mg/g of arsenic (III).
(1) take rice straw as reactive matrix, the pretreatment of stalk is with example 2.
(2) quaternary ammonium reaction
2g rice straw stalk is put into three-neck flask, add 30mL Quat188 (mass concentration 65% aqueous solution), 30mL4M sodium hydroxide solution, 75 ℃ of heating water bath 13h, cold filtration, with distilled water, be washed till neutrality, 50 ℃ of vacuum drying, obtain the rice straw material WS-N that quaternary amine is modified, can be used for arsenic-adsorbing (III), its physicochemical property is as follows:
| Nitrogen content (%) | Water absorption rate (mass ratio) |
| 1.98 | 5.82 |
(3) static balancing adsorption test
Method, with example 1, is made adsorption isotherm as shown in figure 12: to the maximum equilibrium adsorption capacity 35.79mg/g of arsenic (III).
(4) adsorption-desorption experiment
Method, with example 1, repeats 10 batches of adsorption-desorption experimental results as follows continuously.
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Adsorbance (mg/L) | 33.23 | 31.65 | 33.36 | 34.11 | 32.43 | 33.21 | 32.50 | 34.92 | 32.45 | 34.33 |
Embodiment 1-8 utilizes the stalk sorbing material that this method prepares can effectively adsorb trivalent arsenic, adsorbance is up to 34-36mg/g, and through continuous 10 batches of adsorption-desorptions experiment, this sorbing material still keeps higher adsorption capacity, show that this sorbing material absorption property is stable.
Claims (5)
1. utilize discarded straw for an arsenious sorbing material in adsorbable water, it is characterized in that the fiber of stalk
In element structure, be modified with quaternary ammonium salt group, its basic structure formula is as follows:
2. utilize discarded straw for a preparation method for arsenious sorbing material in adsorbable water, the steps include:
(1) pretreatment of discarded stalk
To discard stalk and clean with distilled water, 40-60 ℃ of oven dry, is cut into the segment of 0.5-0.8mm, then puts it into mass concentration 1-5%Na
2cO
3in the mixed liquor of 1-5%NaCl, ultrasonic cleaning 2-3h; After taking-up, with distilled water, clean 40-60 ℃ of dry for standby;
(2) quaternary ammonium reaction
To be placed in three-neck flask through pretreated discarded stalk, add the Quat188 aqueous solution, sodium hydroxide solution, 70-80 ℃ of heating water bath 12-16h, cold filtration, with distilled water, be washed till neutrality, 40-60 ℃ of vacuum drying, obtains the Wheat Straw material WS-N that quaternary amine is modified, for adsorbing trivalent arsenic.
3. the discarded straw of utilization according to claim 2, for the preparation method of arsenious sorbing material in adsorbable water, is characterized in that stalk quality g:Quat188ml in described step (2): sodium hydroxide solution ml=1:15-20:15; Wherein Quat188 aqueous solution mass percent concentration is 50-80%, and sodium hydroxide solution molar concentration is 3-5M.
4. according to the preparation method described in claim 2-3, it is characterized in that: described stalk is selected from a kind of in straw, wheat straw, maize straw, soybean stalk, cotton stalk or sweet potato vine.
5. the discarded Wheat Straw of utilization according to claim 1 is prepared in adsorbable water arsenious sorbing material for Adsorption water trivalent arsenic.
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