CN103551121B - One utilizes waste straw to prepare arsenious adsorbing material and its preparation method and application in adsorbable water - Google Patents
One utilizes waste straw to prepare arsenious adsorbing material and its preparation method and application in adsorbable water Download PDFInfo
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Abstract
The invention discloses one utilizes waste straw to prepare arsenious adsorbing material and preparation method thereof in adsorbable water, belongs to field of synthesis and application of environment functional materials.The present invention, with waste straw as substrate, prepares adsorbing material through a step quaternary ammonium reaction.This preparation method is simple, raw material sources extensive, and prepared adsorbing material energy active adsorption removes trivalent arsenic in water, and the adsorbing material after available sodium chloride or sodium hydroxide solution are desorbed trivalent arsenic, and desorption and regeneration after absorption is stable to the absorption property of arsenic.It is the effective way to farmland waste straw recycling that the method prepares novel absorption material.
Description
Technical field:
The invention discloses trivalent arsenic adsorbing material and preparation method thereof in a kind of adsorbable water, be in particular
One utilizes waste straw to prepare arsenious adsorbing material and its preparation method and application in adsorbable water.
Background technology:
Trivalent arsenic is very harmful to health and ecological environment, and the most efficiently removing trivalent arsenic in water becomes water
The study hotspot in pollution control field.Absorption method utilizes the bigger serface that adsorbent provides, by arsenic pollutant
And affinity stronger between adsorbent reaches to purify the purpose of arsenic removal.Absorption method is due to simple to operate, operational effect
Arsenic in stable, recoverable wastewater, environment is not produced secondary pollution, and adsorbing material wide material sources, price
Extremely people cheap, reusable pay close attention to, the current conventional main active charcoal of adsorbing material, metal/ore deposit
Material, synthetic macromolecule resin, composite organic-inorganic material.But above-mentioned adsorbing material is actually used
During there is more area for improvement: 1) active carbon adsorption material adsorption capacity is relatively low, processes highly concentrated
Degree is shorter containing service life during arsenic sewage；2) metals/minerals matter adsorbing material such as activated alumina, Zero-valent Iron etc.,
It is relatively costly, is not suitable for extensive；3) although synthetic macromolecule resin material adsorption capacity is big, but
It is to typically require first to synthesize macromolecule matrix, then by surface grafting group or carried metal, therefore prepares
Process is complex, and cost is the highest, lacks economy, and macromolecule resin material itself is not easy to degraded,
Need when service life exhausts to carry out safe disposal.
On the other hand, China is large agricultural country, and agricultural waste material stalk resource is the abundantest.In straw
Containing substantial amounts of cellulose, compared with synthesis macromolecule, cellulose has fully biodegradable, nontoxic, nothing
Pollute, easily modified, good biocompatibility, the advantage such as renewable be it is considered to be the future world energy, chemical industry
Primary raw material.Cellulosic structure contains many hydrophilic oh groups, by the esterification of hydroxyl, etherificate,
A series of derivative reaction such as graft copolymerization, can be modified it, introduces in the molecule and has specific absorption
The functional group of performance, can prepare natural polymer adsorbing material.The present invention is exactly on the basis of agricultural crop straw
It is modified so that it is with quaternary amines, realizes synthesizing new trivalent arsenic adsorbing material.
Summary of the invention:
1, invention to solve the technical problem that
Deficiency for the adsorbing material existence that existing document is reported: 1) active carbon adsorption material adsorption capacity is relatively
Low, process high concentration shorter containing service life during arsenic sewage；2) metals/minerals matter adsorbing material such as active oxidation
Aluminum, Zero-valent Iron etc., it is relatively costly, is not suitable for extensive；3) although synthetic macromolecule resin material
Adsorption capacity is big, but typically requires and first synthesize macromolecule matrix, then by surface grafting group or load
Metal, therefore preparation process is complex, and cost is the highest, lacks economy, and macromolecule resin material
Itself it is not easy to degraded, needs when service life exhausts to carry out safe disposal；4) existing Plant fiber is utilized
Prepare the raw material of adsorbing material and mostly be bagasse, natural fiber crops, cotton fiber etc., primary attachment remove phosphate radical in water,
Nitrate ion and heavy metal ion, and building-up process need add sweller, catalyst, grafted monomers,
Amination reagents etc., aminating reaction process is complicated, and the response rate is low.Although there being scholar's research to prepare cellulose in recent years
Adsorbing material remove arsenic and fluorion in water (for remove arsenic and fluorion in water cellulose base adsorbing material and
Its preparation method, China Patent Publication No. CN102139202A), but the method preparation condition is harsh, and
And the alkalescence group (primary amine, secondary amine group) of grafting can only issue at neutral or acid condition (such as pH1～9)
Give birth to adsorption, and adsorbance is remarkably decreased [Li Buhai, Li Linjing, Sun little Mei, second along with the increase of pH
The research [J] of diamidogen modified peanut powder adsorpting anion dyestuff. Journal of SCUN (natural science
Version), 2011,30 (3): 20-24].In addition, the adsorption capacity of the cellulose base adsorbing material that prepared by the method is relatively
Low, removal effect arsenious to high concentration is inconspicuous.
The invention provides one utilizes waste straw to prepare arsenious adsorbing material and system thereof in adsorbable water
Preparation Method and application, with waste straw as matrix, after simple pretreatment, by a step quaternary ammonium reaction
Prepare novel absorption material, it is possible to active adsorption removes trivalent arsenic in water.Adsorb saturated after, hydroxide can be used
Sodium solution or sodium chloride solution carry out desorption and regeneration, and the adsorbing material adsorptivity after desorption and regeneration to it
Can not decline.This invention not only reaction raw materials is easy to get, synthesis step simple, and compared to alkalescence group,
The quaternary ammonium group of load can go out OH-at dissociation in water and in strong basicity, can normally work under different pH,
On adsorbance impact, not quite [Quaternary Ammonium Salt of Chitosan film is to dodecane in water body for Huang Xiaodong, Xu Guoqin, Lou Benyong
The research [J] of base benzene sulfonic acid sodium salt absorption. Environmental science and technology, 2012,35 (11): 65-69].Additionally, this material
The adsorbance of material is significantly larger than other allied fiber element adsorbing materials, removal arsenious to high concentration, such as
There is huge advantage in the process of sudden trivalent arsenic contamination accident.
2, technical scheme
The one that the present invention provides utilizes waste straw to prepare arsenious adsorbing material in adsorbable water, through pre-
Process, quaternary ammonium reaction be prepared from, i.e. straw cellulose [Runcang Sun, J.M.Lawther,
W.B.Banks, A tentative chemical structure of wheat straw lignin (wheat stalk lignin structure
The progress of model) [J] .Industrial Crops and Products(agricultural industry and product)
1997, (6): 1-8.] it is matrix, it is modified with quaternary ammonium salt group above, its basic structure formula is as follows:
Described adsorbing material nitrogen content is 1-2%；Water absorption rate is 5-6 times.
One utilizes waste straw to prepare arsenious adsorbing material preparation method, its preparation process in adsorbable water
As follows:
The steps include:
(1) waste straw pretreatment
Waste straw (Waste Straw, hereinafter referred to as WS) distilled water is cleaned, 40-60 DEG C of drying, be cut into
The segment of about 0.5-0.8mm, then puts it into 1-5%Na2CO3With in the mixed liquor of 1-5%NaCl,
Ultrasonic cleaning 2-3h.After taking-up, clean with distilled water, 40-60 DEG C of dry for standby.
(2) quaternary ammonium reaction
Wheat Straw through pretreatment is put in three-neck flask, adds mass concentration 50-80%Quat188 water
Solution (3-chloro-2-hydroxypropyl-trimethyl ammonium chloride is called for short Quat188, CAS 3327-22-8), 3-5M
Sodium hydroxide solution, 70-80 DEG C of heating in water bath 12-16h, cold filtration, it is washed till neutrality with distilled water, 40-60 DEG C
Vacuum drying, obtains the stalk material (hereinafter referred WS-N) that quaternary amine is modified, i.e. can be used for arsenic-adsorbing (III).
Wherein straw quality g:Quat188ml: sodium hydroxide solution ml=1:15-20:15.
Described straw is in Caulis et Folium Oryzae, wheat straw, corn straw, soybean stalk, cotton stalk or sweet potato vine
A kind of.
3, beneficial effect
The invention provides one utilizes waste straw to prepare arsenious adsorbing material and system thereof in adsorbable water
Preparation Method and application, have a following novelty and advantage relative to prior art:
(1) synthetic method innovation: prepare adsorbing material for matrix with waste straw, raw material sources are extensive, simultaneously
Recycling for waste straw provides effective way；Employing Quat188 is quaternary ammonium reagent, through a step
Quaternary ammonium reaction can be prepared by adsorbing material, and step is simple；
(2) product advantage: adsorbing material prepared by the present invention can be with arsenic (III) in active adsorption water, and adsorbance
/ synthetic adsorbing material natural far above the tradition of other documents and patent report (is shown in Table in 1-document not
With natural material as the adsorbent of matrix to arsenious adsorbance)；The adsorbing material of preparation is without heavy metal
, the most there is not the problem that heavy metal ion runs off, do not easily cause secondary in ion (such as iron ion, aluminium ion)
Pollute；Quaternary amine group on the adsorbing material of preparation will not run off because of current scour, to arsenious absorption
Stable performance.
Table 1 document reports that the different natural material adsorbent as matrix is to arsenious adsorbance
(3) adsorbing material after desorption and regeneration is stable to the absorption property of arsenic.
Accompanying drawing explanation
The structural formula figure of the adsorbing material WS-N of preparation in Fig. 1 embodiment 1.
The solid-state nuclear magnetic resonance spectrogram of the adsorbing material WS-N of preparation in Fig. 2 embodiment 213CNMR and the spy of correspondence
Levying peak structure, abscissa represents13The chemical shift of C, vertical coordinate represents intensity.
(left figure amplifies 5000 times to the adsorbing material WS-N scanning electron microscope (SEM) photograph of preparation in Fig. 3 embodiment 2, part table
The particulate matter that face covers is the quaternary amine structure in load；Right figure amplifies 500 times, presents threadiness knot clearly
Structure).
The XPS analysis figure of the adsorbing material WS-N of preparation in Fig. 4 embodiment 3, abscissa represents and combines energy, indulges and sit
Mark represents absorption intensity.As seen from the figure, N1s orbital electron is combining the absorption at energy 399.5eV (± 0.1eV) place
Peak represents modified stalk material and has C-N structure, it was demonstrated that the quaternary ammonium moiety of Quat188 is by effectively
It is grafted on straw.
The adsorbing material WS-N adsorption test adsorption isotherm of preparation in Fig. 5 embodiment 1.
The adsorbing material WS-N adsorption test adsorption isotherm of preparation in Fig. 6 embodiment 2.
The adsorbing material WS-N adsorption test adsorption isotherm of preparation in Fig. 7 embodiment 3.
The adsorbing material WS-N adsorption test adsorption isotherm of preparation in Fig. 8 embodiment 4.
The adsorbing material WS-N adsorption test adsorption isotherm of preparation in Fig. 9 embodiment 5.
The adsorbing material WS-N adsorption test adsorption isotherm of preparation in Figure 10 embodiment 6.
The adsorbing material WS-N adsorption test adsorption isotherm of preparation in Figure 11 embodiment 7.
The adsorbing material WS-N adsorption test adsorption isotherm of preparation in Figure 12 embodiment 8.
Detailed description of the invention
Embodiment 1
(1) pretreatment of straw
Wheat Straw (WS) distilled water is cleaned, 60 DEG C of drying, be cut into the segment of about 0.5-0.8mm, so
After put it into 1%Na2CO3With in the mixed liquor of 1%NaCl, ultrasonic cleaning 2h.After taking-up, with distillation
Water is cleaned, 60 DEG C of dry for standby.
(2) quaternary ammonium reaction
Putting in three-neck flask by 2g Wheat Straw, (mass concentration 50% is water-soluble to add 30mL Quat188
Liquid), 30mL3M sodium hydroxide solution, 80 DEG C of heating in water bath 12h, cold filtration, be washed till with distilled water
Neutrality, 60 DEG C of vacuum drying, obtain the Wheat Straw material WS-N that quaternary amine is modified, i.e. 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 equilibrium adsorption test
In 5 conical flasks, it is separately added into 0.05g WS-N straw, each conical flask is separately added into 50ml
Initial concentration is 10,20,30,40, arsenic (III) solution of 50mg/L, vibrate 2 hours in 20 DEG C of shaking tables
After, measure and solution remains arsenic concentration, and according to below equation calculated equilibrium adsorbance:
Equilibrium adsorption capacity=[solution arsenic (III) concentration during initial soln arsenic (III) concentration-adsorption equilibrium] × liquor capacity/straw
Quality；
With solution equilibria concentration as X-axis, equilibrium adsorption capacity is Y-axis, makees adsorption isotherm as shown in Figure 5:
Equilibrium adsorption capacity 34.58mg/g maximum to arsenic (III).
(4) adsorption-desorption experiment
In conical flask, add 0.05g WS-N straw, add the arsenic (III) of 50ml initial concentration 50mg/L
Solution, after vibrating 2 hours, measures and remains arsenic concentration, calculated equilibrium adsorbance in solution in 20 DEG C of shaking tables.
Then it is washed with deionized WS-N, adds the sodium hydroxide solution that 10ml mass concentration is 4%,
20 DEG C of shaking tables vibrate 20 minutes, is washed with deionized, carry out second time adsorption experiment.Continuously repeat 10
Batch adsorption-desorption experimental result is 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 straw
Rice straw (WS) distilled water is cleaned, 60 DEG C of drying, is cut into the segment of about 0.5-0.8mm,
Then 2%Na is put it into2CO3With in the mixed liquor of 2%NaCl, ultrasonic cleaning 3h.After taking-up, with steaming
Distilled water is cleaned, 50 DEG C of dry for standby.
(2) quaternary ammonium reaction
2g rice straw is put in three-neck flask, addition 34mL Quat188 (mass concentration 60% aqueous solution),
30mL4M sodium hydroxide solution, 75 DEG C of heating in water bath 14h, cold filtration, it is washed till neutrality with distilled water,
40 DEG C of vacuum drying, rice straw its physicochemical property of material WS-N obtaining 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 adsorbing material WS-N of preparation in embodiment 213CNMR and right
The characteristic peak structure answered, abscissa represents13The chemical shift of C, vertical coordinate represents intensity.
Fig. 3 is adsorbing material WS-N scanning electron microscope (SEM) photograph (left figure amplification 5000 times, the portion of preparation in embodiment 2
The particulate matter that point surface covers is the quaternary amine structure in load；Right figure amplifies 500 times, presents fiber clearly
Shape structure).
(3) static adsorption equilibria test
Method, with example 1, makees adsorption isotherm as shown in Figure 6: equilibrium adsorption capacity 34.80mg/g maximum to arsenic (III).
(4) adsorption-desorption experiment
Method, with example 1, continuously repeats 10 batch adsorption-desorption experimental results as follows.
| Batch | 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 straw
Corn straw (WS) distilled water is cleaned, 60 DEG C of drying, is cut into the segment of about 0.5-0.8mm,
Then 3%Na is put it into2CO3With in the mixed liquor of 3%NaCl, ultrasonic cleaning 2.5h.After taking-up, use
Distilled water is cleaned, 40 DEG C of dry for standby.
(2) quaternary ammonium reaction
2g corn straw is put in three-neck flask, adds 36mL Quat188 (70% aqueous solution), 30mL5
M sodium hydroxide solution, 70 DEG C of heating in water bath 16h, cold filtration, it is washed till neutrality with distilled water, 50 DEG C are true
Empty dry, obtain the corn straw material WS-N that quaternary amine is modified, i.e. can be used for arsenic-adsorbing (III), its physics and chemistry
Characteristic is as follows:
| Nitrogen content (%) | Water absorption rate (mass ratio) |
| 1.65 | 5.61 |
Fig. 4 is the XPS analysis figure of the adsorbing material WS-N of preparation in embodiment 3, and abscissa represents and combines energy,
Vertical coordinate represents absorption intensity.As seen from the figure, N1s orbital electron is combining energy 399.5eV (± 0.1eV) place
Absworption peak represents modified stalk material and has C-N structure, it was demonstrated that the quaternary ammonium moiety of Quat188 is had
It is grafted on straw to effect.
(3) static equilibrium adsorption test
Method, with example 1, makees adsorption isotherm as shown in Figure 7: equilibrium adsorption capacity 35.22mg/g maximum to arsenic (III).
(4) adsorption-desorption experiment
Method, with example 1, continuously repeats 10 batch adsorption-desorption experimental results as follows.
| Batch | 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 straw
Soybean stalk (WS) distilled water is cleaned, 50 DEG C of drying, is cut into the segment of about 0.5-0.8mm,
Then 4%Na is put it into2CO3With in the mixed liquor of 4%NaCl, ultrasonic cleaning 2h.After taking-up, with steaming
Distilled water is cleaned, 60 DEG C of dry for standby.
(2) quaternary ammonium reaction
2g soybean stalk is put in three-neck flask, adds 40mL Quat188 (80% aqueous solution), 30mL
5M sodium hydroxide solution, 70 DEG C of heating in water bath 14h, cold filtration, it is washed till neutrality with distilled water, 60 DEG C
Vacuum drying, obtains the soybean stalk material WS-N that quaternary amine is modified, i.e. can be used for arsenic-adsorbing (III), its reason
Change characteristic as follows:
| Nitrogen content (%) | Water absorption rate (mass ratio) |
| 1.79 | 5.88 |
(3) static equilibrium adsorption test
Method, with example 1, makees adsorption isotherm as shown in Figure 8: equilibrium adsorption capacity 35.71mg/g maximum to arsenic (III).
(4) adsorption-desorption experiment
Method, with example 1, continuously repeats 10 batch adsorption-desorption experimental results as follows.
| Batch | 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 |
Embodiment 5
(1) pretreatment of straw
Cotton stalk (WS) distilled water is cleaned, 40 DEG C of drying, is cut into the segment of about 0.5-0.8mm,
Then 5%Na is put it into2CO3With in the mixed liquor of 5%NaCl, ultrasonic cleaning 3h.After taking-up, with steaming
Distilled water is cleaned, 45 DEG C of dry for standby.
(2) quaternary ammonium reaction
2g cotton stalk is put in three-neck flask, addition 35mL Quat188 (mass concentration 70% aqueous solution),
30mL4M sodium hydroxide solution, 80 DEG C of heating in water bath 15h, cold filtration, it is washed till neutrality with distilled water,
50 DEG C of vacuum drying, obtain the cotton stalk material WS-N that quaternary amine is modified, i.e. 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 equilibrium adsorption test
Method, with example 1, makees adsorption isotherm as shown in Figure 9: equilibrium adsorption capacity 35.14mg/g maximum to arsenic (III).
(4) adsorption-desorption experiment
Method, with example 1, continuously repeats 10 batch adsorption-desorption experimental results as follows.
| Batch | 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 straw
2g sweet potato vine straw (WS) distilled water is cleaned, 50 DEG C of drying, be cut into the little of about 0.5-0.8mm
Section, then puts it into 2%Na2CO3With in the mixed liquor of 2%NaCl, ultrasonic cleaning 2h.After taking-up,
Clean with distilled water, 60 DEG C of dry for standby.
(2) quaternary ammonium reaction
2g sweet potato vine is put in three-neck flask, addition 30mL Quat188 (mass concentration 65% aqueous solution),
30mL4M sodium hydroxide solution, 80 DEG C of heating in water bath 13h, cold filtration, it is washed till neutrality with distilled water,
40 DEG C of vacuum drying, obtain the sweet potato vine material WS-N that quaternary amine is modified, i.e. 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 equilibrium adsorption test
Method, with example 1, makees adsorption isotherm as shown in Figure 10: equilibrium adsorption capacity 36.17mg/g maximum to arsenic (III).
(4) adsorption-desorption experiment
Method, with example 1, continuously repeats 10 batch adsorption-desorption experimental results as follows.
| Batch | 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) with Wheat Straw as reactive matrix, the pretreatment of straw is with example 1.
(2) quaternary ammonium reaction
2g Wheat Straw is put in three-neck flask, addition 28mL Quat188 (mass concentration 65% aqueous solution),
30mL4M sodium hydroxide solution, 75 DEG C of heating in water bath 13h, cold filtration, it is washed till neutrality with distilled water,
50 DEG C of vacuum drying, obtain the Wheat Straw material WS-N that quaternary amine is modified, i.e. 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 equilibrium adsorption test
Side's (4) adsorption-desorption experiment
Method, with example 1, continuously repeats 10 batch adsorption-desorption experimental results as follows.
| Batch | 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, makees adsorption isotherm as shown in figure 11: equilibrium adsorption capacity 36.02mg/g maximum to arsenic (III).
Embodiment 8
(1) with rice straw as reactive matrix, the pretreatment of straw is with example 2.
(2) quaternary ammonium reaction
Putting in three-neck flask by 2g rice straw stalk, (mass concentration 65% is water-soluble to add 30mL Quat188
Liquid), 30mL4M sodium hydroxide solution, 75 DEG C of heating in water bath 13h, cold filtration, be washed till with distilled water
Neutrality, 50 DEG C of vacuum drying, obtain the rice straw material WS-N that quaternary amine is modified, i.e. can be used for adsorbing
Arsenic (III), its physicochemical property is as follows:
| Nitrogen content (%) | Water absorption rate (mass ratio) |
| 1.98 | 5.82 |
(3) static equilibrium adsorption test
Method, with example 1, makees adsorption isotherm as shown in figure 12: equilibrium adsorption capacity 35.79mg/g maximum to arsenic (III).
(4) adsorption-desorption experiment
Method, with example 1, continuously repeats 10 batch adsorption-desorption experimental results as follows.
| Batch | 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 utilize straw adsorbing material that this method prepares can active adsorption trivalent arsenic, adsorbance
Up to 34-36mg/g, and through continuous 10 batch adsorption-desorption experiments, this adsorbing material still keeps higher
Adsorption capacity, show that this adsorbing material absorption property is stable.
Claims (4)
1. utilize waste straw to prepare a preparation method for arsenious adsorbing material in adsorbable water, the steps include:
(1) pretreatment of waste straw
Waste straw distilled water is cleaned, 40-60 DEG C of drying, be cut into the segment of 0.5-0.8mm, then put
Enter mass concentration 1-5%Na2CO3With in the mixed liquor of 1-5%NaCl, ultrasonic cleaning 2-3h；After taking-up, with steaming
Distilled water is cleaned, 40-60 DEG C of dry for standby；
(2) quaternary ammonium reaction
To be placed in three-neck flask through pretreated waste straw, addition Quat188 aqueous solution, sodium hydroxide are molten
Liquid, 70-80 DEG C of heating in water bath 12-16h, cold filtration, it is washed till neutrality with distilled water, 40-60 DEG C of vacuum drying,
Obtain the waste straw material WS-N that quaternary amine is modified, be used for adsorbing trivalent arsenic；Straw in described step (2)
Quality g:Quat188ml: sodium hydroxide solution ml=1:15-20:15；Wherein Quat188 aqueous solution matter
Amount percent concentration is 50-80%, and sodium hydroxide solution molar concentration is 3-5M.
Preparation method the most according to claim 1, is characterized in that: described straw selected from Caulis et Folium Oryzae, wheat straw,
One in corn straw, soybean stalk, cotton stalk or sweet potato vine.
Waste straw that what method the most according to claim 1 and 2 prepared utilize prepares in adsorbable water three
The adsorbing material of valency arsenic, its basic structure formula is as follows:
Described adsorbing material nitrogen content is
1-2%；Water absorption rate is 5-6 times.
Utilization the most according to claim 3 is discarded Wheat Straw and is prepared arsenious adsorbing material use in adsorbable water
Trivalent arsenic in Adsorption water.
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| CN102600806A (en) * | 2012-03-30 | 2012-07-25 | 南京大学 | Straw modified into strong cation type absorbent and preparation method thereof |
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| US10106436B2 (en) | 2013-03-16 | 2018-10-23 | Chemica Technologies, Inc. | Selective adsorbent fabric for water purification |
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