CN101029452A - Modified absorben cotton, its production and use - Google Patents
Modified absorben cotton, its production and use Download PDFInfo
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- CN101029452A CN101029452A CNA200610156067XA CN200610156067A CN101029452A CN 101029452 A CN101029452 A CN 101029452A CN A200610156067X A CNA200610156067X A CN A200610156067XA CN 200610156067 A CN200610156067 A CN 200610156067A CN 101029452 A CN101029452 A CN 101029452A
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- cotton
- modified absorben
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- absorben cotton
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- 229920000742 Cotton Polymers 0.000 title claims abstract description 61
- 238000004519 manufacturing process Methods 0.000 title abstract 2
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000012153 distilled water Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000002351 wastewater Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 150000001768 cations Chemical class 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 8
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical group [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910001415 sodium ion Inorganic materials 0.000 claims abstract description 5
- NPYPAHLBTDXSSS-UHFFFAOYSA-N Potassium ion Chemical group [K+] NPYPAHLBTDXSSS-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910001414 potassium ion Chemical group 0.000 claims abstract description 3
- 238000001914 filtration Methods 0.000 claims abstract 4
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 claims description 31
- 229910001431 copper ion Inorganic materials 0.000 claims description 31
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000002360 preparation method Methods 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 12
- 229910052783 alkali metal Inorganic materials 0.000 claims description 9
- 150000001340 alkali metals Chemical class 0.000 claims description 9
- -1 hydrogen sodium hydride Chemical class 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- 239000012467 final product Substances 0.000 claims description 4
- 238000010792 warming Methods 0.000 claims description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 2
- 239000012312 sodium hydride Substances 0.000 claims description 2
- 229910000104 sodium hydride Inorganic materials 0.000 claims description 2
- 239000000706 filtrate Substances 0.000 abstract description 4
- 238000002156 mixing Methods 0.000 abstract description 2
- 230000007935 neutral effect Effects 0.000 abstract description 2
- 238000001035 drying Methods 0.000 abstract 2
- 239000010953 base metal Substances 0.000 abstract 1
- 239000013522 chelant Substances 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 description 12
- 238000001179 sorption measurement Methods 0.000 description 11
- 238000002798 spectrophotometry method Methods 0.000 description 7
- 238000000205 computational method Methods 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 description 3
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 230000032050 esterification Effects 0.000 description 3
- 238000005886 esterification reaction Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- RVPVRDXYQKGNMQ-UHFFFAOYSA-N lead(2+) Chemical compound [Pb+2] RVPVRDXYQKGNMQ-UHFFFAOYSA-N 0.000 description 3
- 229960000907 methylthioninium chloride Drugs 0.000 description 3
- 241000692870 Inachis io Species 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 125000003396 thiol group Chemical group [H]S* 0.000 description 2
- HOSGXJWQVBHGLT-UHFFFAOYSA-N 6-hydroxy-3,4-dihydro-1h-quinolin-2-one Chemical group N1C(=O)CCC2=CC(O)=CC=C21 HOSGXJWQVBHGLT-UHFFFAOYSA-N 0.000 description 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- 102100034279 Calcium-binding mitochondrial carrier protein Aralar2 Human genes 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 1
- 150000008065 acid anhydrides Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 108010084210 citrin Proteins 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 229910001447 ferric ion Inorganic materials 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- FDZZZRQASAIRJF-UHFFFAOYSA-M malachite green Chemical compound [Cl-].C1=CC(N(C)C)=CC=C1C(C=1C=CC=CC=1)=C1C=CC(=[N+](C)C)C=C1 FDZZZRQASAIRJF-UHFFFAOYSA-M 0.000 description 1
- 229940107698 malachite green Drugs 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
Modified absorbent cotton, its production and usage are disclosed. In the general formula, R is sodium ion and potassium ion. The process is carried out by mixing absorbent cotton with citric acid solution, agitating, drying to constant weight, raising temperature to 115-125degree, keeping temperature, cooling to room temperature, washing by distilled water, filtering, adding base-metal solution into filtrate, agitating for 60mins, filtering, washing filtrate to neutral, drying to constant weight, adjusting pH of waste water containing cation to 4-7, adding into modified absorbent cotton 1-20g/l, agitating for 30mins and filtering. It's simple, cheap, has better chelate performance and can be used to treat cation waste water.
Description
Technical field:
The invention belongs to modified absorben cotton and preparation thereof, this technical field of using method, especially belong to carboxyl cotton and preparation thereof, this technical field of using method.
Background technology:
Modified absorben cotton commonly used has Sulfhydryl Cotton, and its preparation method be with TGA, acetic anhydride, acetate, the abundant mixing of the concentrated sulfuric acid, be cooled to room temperature after, adding absorbent cotton.After the immersion fully, be incubated after 2～4 days and take out, suction filtration, washing is to neutrality and in 30 ℃ of oven dry down.The prepared product that goes out must lucifuge, and airtight, low temperature is preserved.It is through being usually used in the analyzing and testing of trace materials, and the Sulfhydryl Cotton chelating ability is poor, while complicated process of preparation, cost height.
Summary of the invention:
Technical problem to be solved by this invention provides the modified absorben cotton of chelating ability.
The technical scheme of technical solution problem of the present invention is: a kind of modified absorben cotton is characterized in that: comprise the following units in its structural formula:
Described R is sodium ion, potassium ion, and preferred R is a sodium ion.
The preparation method of modified absorben cotton of the present invention is: with absorbent cotton and 0.1-1M citric acid solution with 1: 10-30 (cotton: acid, W/V) mixed, after stirring is not less than 20 minutes, dry to constant weight at 50-80 ℃, be warming up to 115-125 ℃ and the insulation be not less than 90 minutes, be chilled to room temperature, to solution, there is not citric acid with the distilled water cyclic washing, filter, add the capacity alkali metal soln in the filtered object, stirring is filtered after being not less than 60 minutes, and filtered object is washed with distilled water to neutrality, is dried to constant weight under 50-80 ℃.
Preferred distilled water is distilled water.
Described alkali metal soln is the hydrogen sodium hydride solution, potassium hydroxide solution.
Preferred alkali metal soln is the sodium hydroxide solution of 0.1M.
Preparation principle of the present invention is: citric acid dehydration forms the acid anhydrides with reactivity, so with cellulose in the C of sugar unit
6Hydroxyl generation esterification, generate citric acid cellulose monoesters, transferring two no esterification carboxyls of citric acid in the esterification cotton to alkali metal type by Hydrogen with alkali metal soln again, is that sodium hydroxide solution is an example with used alkali metal soln, reacts available following chemical formula and expresses:
The prepared carboxy-modified absorbent cotton of the present invention can be used for processing and contain CATION waste water, and described CATION comprises metal ion, as iron ion, copper ion, lead ion, and the CATION basic-dyeable fibre.
Using method of the present invention is regulated pH to 4-7 for containing CATION waste water, adds the stirring of 1-20g/l modified absorben cotton and is not less than 30 minutes, filters to get final product.
Preferred using method is regulated pH to 5-6 for containing copper ion waste water, adds the stirring of 1-5g/l modified absorben cotton and gets final product in 30-90 minute
The waste water that contains copper ion with processing is example, and its reaction equation is:
The present invention compared with prior art, the chelating ability of modified absorben cotton obviously improves, and can be used to handle cationic waste water, enlarged the scope of application of modified absorben cotton, preparation method of the present invention is very simple simultaneously, and raw material is easy to get, cost is low, can apply widely.
Description of drawings:
Fig. 1 for the infrared spectrum of absorbent cotton and modified absorben cotton wherein a be absorbent cotton; B: be modified absorben cotton.
Fig. 2 is the influence of pH to modified absorben cotton absorbing copper ion (divalence).
Fig. 3 is the influence of adsorption time to modified absorben cotton absorbing copper ion (divalence).
Fig. 4 is the influence of copper concentration to modified absorben cotton absorbing copper ion (divalence).
Fig. 5 is the langmuir's adsorption isotherm of copper ion (divalence) on modified absorben cotton
The specific embodiment:
One, preparation method:
Embodiment 1: with absorbent cotton and 0.1M citric acid solution with 1: 15 (cotton: acid, W/V) mixed, stir after 30 minutes, dry to constant weight at 50 ℃, be warming up to 115 ℃ and be incubated 90 minutes, be chilled to room temperature, to solution, there is not citric acid with the distilled water cyclic washing, (being to splash into the 0.1M plumbi nitras in the filtrate not have muddy the generation), add the 0.1M sodium hydroxide solution of capacity in the filtered object, stir after 60 minutes and filter, filtered object is washed with distilled water to neutrality, under 50 ℃, be dried to constant weight, obtain the sodium salt of modified absorben cotton.
The infared spectrum of modified absorben cotton is the b among Fig. 1, and the b among Fig. 1 compares with a, and infrared spectrum is at 1753.4cm
-1Tangible carbonylic stretching vibration absworption peak appears in the wave number place, and this obviously is the result that Citrin ester produces.
Embodiment 2: with absorbent cotton and 0.5M citric acid solution with 1: 10 (cotton: acid, W/V) mixed, stir after 20 minutes, dry to constant weight at 60 ℃, be warming up to 120 ℃ and be incubated 120 minutes, be chilled to room temperature, to solution, there is not citric acid with the distilled water cyclic washing, (being to splash into the 0.1M plumbi nitras in the filtrate not have muddy the generation), add the 0.1M potassium hydroxide solution of capacity in the filtered object, stir after 90 minutes and filter, filtered object is extremely neutral with the distilled water washing, under 60 ℃, be dried to constant weight, obtain the sylvite of modified absorben cotton.
Two, using method:
Embodiment 3: get 100ml and used the HCl of 0.1M or NaOH adjust pH to 1-7, the cupric solution of 20mg/l places the conical flask of 250ml, the modified absorben cotton that adds 0.1 gram embodiment 1, airtight bottleneck is in case liquor capacity variation in the experimentation, under the room temperature condition on the speed governing oscillator velocity fluctuation with 150 times/minute be adsorbed to 1 hour, filter, gained solution calculates the adsorbance of copper ion with the surplus value of atomic absorption spectrophotometric determination copper ion with following formula:
q＝(C
0-C
e)V/W
In the formula, q is the amount (mg.g of every gram adsorbents adsorb copper
-1), C
0Initial concentration (mg.L for copper solution
-1), Ce is the concentration (mg.L of copper solution after the adsorption equilibrium
-1), V is the volume (L) of solution, W is the amount (g) of adsorbent.
Its result is Fig. 2, and the adsorption rate of copper ion is minimum during pH=1, and this is because of a large amount of H in the solution under the low ph condition
+Functional group-COO with modified absorben cotton
-Be combined into-COOH, thereby influence the absorption of modified absorben cotton copper ion.In the pH=1-4 scope, the absorption of copper ion increases with the pH value, pH 〉=4 o'clock, and the absorption of copper ion reaches equilibrium valve.So subsequent embodiment is all carried out for 5 times at pH.
Embodiment 4: get 100mlpH value=5, the cupric solution of 20mg/l places the conical flask of 250ml, the modified absorben cotton that adds 0.1 gram embodiment 1, airtight bottleneck is in case liquor capacity variation in the experimentation, under the room temperature condition on the speed governing oscillator velocity fluctuation with 150 times/minute be adsorbed to appropriate time, filter, the gained solution surplus value of atomic absorption spectrophotometric determination copper ion, the computational methods of the adsorbance of copper ion are identical with embodiment 3.
Its result is Fig. 3, absorption by the visible incipient stage copper ion of result among the figure is very fast, be a diffusion absorption phase that adsorption rate is gradually slow after the quick absorption of copper ion, last being adsorbed on about 30 minutes of copper ion reaches adsorption equilibrium, so subsequent embodiment all stirred 1 hour.
Embodiment 5: the cupric solution of getting 100mlpH value=5 places the conical flask of 250ml, the modified absorben cotton that adds 0.1 gram embodiment 1, airtight bottleneck is in case liquor capacity variation in the experimentation, under the room temperature condition on the speed governing oscillator velocity fluctuation with 150 times/minute be adsorbed to 1 hour, filter, the gained solution surplus value of atomic absorption spectrophotometric determination copper ion, the computational methods of the adsorbance of copper ion are identical with embodiment 3.
Its result is Fig. 4, and Fig. 4 has shown the influence result of copper ion concentration to modified absorben cotton absorbing copper ion.When copper ion concentration increased to 70mg/l by 5mg/l, the copper ion adsorption rate of modified absorben cotton reduced to 42.62% from 99.74; With the langmuir's adsorption isotherm equation adsorpting data of copper ion among Fig. 4 is carried out match, linear langmuir equation has following form:
C
e/q
e＝1/(aQ
m)+C
e/Q
m
C in the formula
eThe liquid concentration of copper ion when (mg/l) being adsorption equilibrium, q
eThe adsorbance of copper ion when (mg/g) being adsorption equilibrium, Q
m(mg/g) be the maximal absorptive capacity of copper ion, can be by C
e/ q
eTo C
eThe slope 1/Q of mapping gained linear equation
m.
Approach 1 linearly dependent coefficient (R from Fig. 5 gained
2=0.9714) absorption of the visible copper ion of numerical value on modified absorben cotton meets langmuir equation, by the slope 1/Q of langmuir's adsorption isotherm gained linear equation
mThe maximal absorptive capacity of trying to achieve copper ion is 22.68mg/g.
Embodiment 6: get 100mlpH value=5, the ferric ion solution of 20mg/l places the conical flask of 250ml, the modified absorben cotton that adds 0.1 gram embodiment 2, airtight bottleneck is in case liquor capacity variation in the experimentation, under the room temperature condition on the speed governing oscillator velocity fluctuation with 150 times/minute be adsorbed to 1 hour, filter, the gained solution surplus value of atomic absorption spectrophotometric determination iron ion, the computational methods of the adsorbance of iron ion are identical with embodiment 3.Its adsorbance is 19.47mg/g.
Embodiment 7: get 100mlpH value=5, the lead solution of 20mg/l places the conical flask of 250ml, the modified absorben cotton that adds 0.1 gram embodiment 1, airtight bottleneck is in case liquor capacity variation in the experimentation, under the room temperature condition on the speed governing oscillator velocity fluctuation with 150 times/minute be adsorbed to 1 hour, filter, the gained solution surplus value of atomic absorption spectrophotometric determination lead ion, the computational methods of the adsorbance of lead ion are identical with embodiment 3.Its adsorbance is 30.76mg/g.
Embodiment 8: get 100mlpH value=5, the methylene blue solution of 200mg/l places the conical flask of 250ml, the modified absorben cotton that adds 0.1 gram embodiment 1, airtight bottleneck is in case liquor capacity variation in the experimentation, under the room temperature condition on the speed governing oscillator velocity fluctuation with 150 times/minute be adsorbed to 1 hour, filter, the gained solution surplus value of spectrophotometry methylene blue, the computational methods of the adsorbance of methylene blue are identical with embodiment 3.Its adsorbance is 185.23mg/g.
Embodiment 9: get 100mlpH value=5, the malachite green solution of 20mg/l places the conical flask of 250ml, the modified absorben cotton that adds 0.1 gram embodiment 1, airtight bottleneck is in case liquor capacity variation in the experimentation, under the room temperature condition on the speed governing oscillator velocity fluctuation with 150 times/minute be adsorbed to 1 hour, filter, the gained solution surplus value of spectrophotometry peacock green, the computational methods of the adsorbance of peacock green are identical with embodiment 3.Its adsorbance is 174.75mg/g.
Embodiment 6-9 shows that the present invention can fully be adsorbed the CATION in the waste water.
Claims (8)
1, a kind of modified absorben cotton is characterized in that: comprise the following units in its structural formula:
Described R is sodium ion, potassium ion.
2, a kind of modified absorben cotton according to claim 1 is characterized in that: described R is a sodium ion.
3, the preparation method of the described modified absorben cotton of a kind of claim 1, it is characterized in that: with absorbent cotton and 0.1-1M citric acid solution with 1: 10-30 (cotton: acid, W/V) mixed, after stirring is not less than 20 minutes, dry to constant weight at 50-80 ℃, be warming up to 115-125 ℃ and the insulation be not less than 90 minutes, be chilled to room temperature, to solution, there is not citric acid with the distilled water cyclic washing, filter, add the capacity alkali metal soln in the filtered object, filter after stirring is not less than 60 minutes, filtered object is washed with distilled water to neutrality, under 50-80 ℃, is dried to constant weight.
4, the preparation method of a kind of modified absorben cotton according to claim 3 is characterized in that: described distilled water is distilled water.
5, the preparation method of a kind of modified absorben cotton according to claim 3 is characterized in that: described alkali metal soln is the hydrogen sodium hydride solution, potassium hydroxide solution.
6, the preparation method of a kind of modified absorben cotton according to claim 5 is characterized in that: described alkali metal soln is the sodium hydroxide solution of 0.1M.
7, the using method of the described modified absorben cotton of a kind of claim 1 is characterized in that: will contain CATION waste water and regulate pH to 4-7, and add the stirring of 1-20g/l modified absorben cotton and be not less than 30 minutes, filtration gets final product.
8, the using method of modified absorben cotton according to claim 7 is characterized in that: will contain copper ion waste water and regulate pH to 5-6, and add the stirring of 1-5g/l modified absorben cotton and got final product in 30-90 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610156067XA CN101029452A (en) | 2006-12-31 | 2006-12-31 | Modified absorben cotton, its production and use |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610156067XA CN101029452A (en) | 2006-12-31 | 2006-12-31 | Modified absorben cotton, its production and use |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101029452A true CN101029452A (en) | 2007-09-05 |
Family
ID=38714988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200610156067XA Pending CN101029452A (en) | 2006-12-31 | 2006-12-31 | Modified absorben cotton, its production and use |
Country Status (1)
| Country | Link |
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| CN (1) | CN101029452A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102266757A (en) * | 2011-09-10 | 2011-12-07 | 大连理工大学 | Methods for preparing modified biomass absorbent and removing heavy metal from beverage |
| CN104088157A (en) * | 2014-06-27 | 2014-10-08 | 白建华 | Method for producing absorbent cotton by using biochemical composite treatment technology |
-
2006
- 2006-12-31 CN CNA200610156067XA patent/CN101029452A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102266757A (en) * | 2011-09-10 | 2011-12-07 | 大连理工大学 | Methods for preparing modified biomass absorbent and removing heavy metal from beverage |
| CN102266757B (en) * | 2011-09-10 | 2014-04-23 | 大连理工大学 | Methods for preparing modified biomass absorbent and removing heavy metal from beverage |
| CN104088157A (en) * | 2014-06-27 | 2014-10-08 | 白建华 | Method for producing absorbent cotton by using biochemical composite treatment technology |
| CN104088157B (en) * | 2014-06-27 | 2016-04-13 | 白建华 | Method for producing absorbent cotton by biochemical composite treatment technology |
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