CN101885527A - Method for purifying carbon nanotube polluted water body - Google Patents
Method for purifying carbon nanotube polluted water body Download PDFInfo
- Publication number
- CN101885527A CN101885527A CN 201010227840 CN201010227840A CN101885527A CN 101885527 A CN101885527 A CN 101885527A CN 201010227840 CN201010227840 CN 201010227840 CN 201010227840 A CN201010227840 A CN 201010227840A CN 101885527 A CN101885527 A CN 101885527A
- Authority
- CN
- China
- Prior art keywords
- carbon nanotube
- carbon nanotubes
- concentration
- water
- water body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Carbon And Carbon Compounds (AREA)
Abstract
The invention relates to a method for settling, filtering and removing carbon nanotubes by using calcium ions, is suitable for treating a water body polluted by the carbon nanotubes and belongs to the field of nanotechnology and environmental protection technology. The method comprises a step of: agglomerating carbon nanotubes by adding calcium chloride into carbon nanotube solution so as to remove the carbon nanotubes in the water body by a filtering method. When the calcium ions have a concentration of 0.001mol/L, the clearance rate of the carbon nanotubes is higher than 99 percent; a residual amount is less than 5 mu g/ml; and water solution is colourless and transparent. Under the conditions of different acid and alkaline degrees and ion strengths, the method also can effectively eliminate the carbon nanotubes. Under the presence of a surface active agent and a natural organic matter, the same excellent elimination effect also can be achieved by improving the additive amount of the calcium chloride moderately. The concentration of the calcium ions used for elimination is lower, and purified water is moderately hard water and can be discharged directly without softening treatment.
Description
Technical field
The present invention has developed and has a kind ofly assembled carbon nanotube and sedimentation and remove by filter the method for carbon nanotube by calcium ion, is suitable for handling the water body of carbon nanotube pollution, belongs to nanotechnology and environmental protection technical field.
Background technology
Since being found first in 1991, because its many excellent properties at aspects such as physico-chemical properties, carbon nanotube receives lot of domestic and foreign scientific research personnel's concern always.The huge applications potentiality of carbon nanotube constantly enlarge its synthetic and preparative-scale.Nobel laureate doctor Smalley foretold once that the annual carbon nanotube of producing in the whole world will reach millions of tons in the several years.Meanwhile, the biological safety of carbon nanotube also is widely studied, and comprises bacterium, cell, animal, the toxicity of plant and environment.Studies show that carbon nanotube may produce harm to environment.Carbon nanotube produce, transportation and use, abandon in the process and all might enter environment, thereby environment is worked the mischief.The toxicity of carbon nanotube is closely related with its concentration.The concentration that reduces carbon nanotube in the environment will inevitably reduce its environmental toxicity.But, also do not have effective means to be used for removing the environment carbon nanotube at present.
There are some researches show that carbon nanotube can take place to reunite and sedimentation in particular environment, this process is subjected to influence of various factors.Carboxylated carbon nanotube is easy to reunite under the situation that metal ion exists.Utilize this phenomenon, we have developed a kind of simple, green, high-efficiency method and have removed the carbon nanotube in the water surrounding.
Summary of the invention
The purpose of this invention is to provide a kind of simple, green, remove the method for carbon nanotube in the water surrounding efficiently, comprising:
(1) calcium ion impels carbon nanotube to reunite.
(2) filter removing carbon nanotube coacervate.
The processing step of removing carbon nanotube method in the water is as follows: with 1.0mL-3.0mL concentration is that 2mg/mL, pH value are 6.0 CaCl
2It is that 1.0mg/mL, pH value are in 6.0 the carbon nano-tube aqueous solutions, to use the vortex mixer mixing that the aqueous solution joins 1.0mL-3.0mL concentration; Precipitate at room temperature natural subsidence 1-2 hour, after the filtration, obtain water white water.
Add a certain amount of calcium chloride solution to carbon nano-tube aqueous solutions, the mixing postprecipitation is natural subsidence 1 hour at room temperature, can remove most of carbon nanotube.In actual use, can utilize stirring to increase the mixing degree of calcium chloride solution and carbon nanotube.Under the cleared condition, calcium ion concn is lower, and the water after the purification belongs to moderately hard water, need not follow-up softening can the discharging.
At calcium ion concn is under the condition of 0.001 mol, and the clearance rate of carbon nanotube is higher than 99%, and residual volume is less than 5 mcg/ml, and the aqueous solution is the water white transparency shape.Under different potential of hydrogen, ionic strength conditions, present method can effectively be removed carbon nanotube equally.Under the condition that tensio-active agent and natural organic matter exist, appropriateness improves the add-on of calcium chloride, can reach the removing effect of same excellence.It is lower to remove used calcium ion concn, and the water after the purification is moderately hard water, and need not softening processing can directly discharge.
Principal feature of the present invention is:
(1) removing carbon nanotube only needs common filter paper filtering, and method is simple, economical and practical.
(2) used calcium ion is the good element of a kind of biocompatibility.
(3) used calcium ion concn is low, can not cause that the water hardness is too high, and the water after the purification can directly discharge.
(4) only contain calcium ion in the carbon nanotube aggregate, wash-out can reclaim carbon nanotube easily.
Description of drawings
Fig. 1 is the elimination efficiency of carbon nanotube under the different calcium ionic concn that the present invention obtained
Fig. 2 is the removing of carbon nanotube under different pH values that the present invention obtained and the ionic strength conditions
Fig. 3 is the removing of carbon nanotube under tensio-active agent that the present invention obtained and the natural organic matter existence condition
Embodiment
Embodiment 1
The removing of carbon nanotube in the water: with 1.0mL-3.0mL concentration is that 2mg/mL, pH value are 6.0 CaCl
2It is that 1.0mg/mL, pH value are in 6.0 the carbon nano-tube aqueous solutions that the aqueous solution joins 1.0mL-3.0mL concentration.After the room temperature sedimentation 1 hour, use filter paper filtering.Microplate reader is measured filtrate can obtain carbon nanotube at the light absorption value at 600nm place clearance.The filtrate achromaticity and clarification is transparent, and clearance very high (Fig. 1) is described.
The removing of carbon nanotube under different pH and the ionic strength: with 1.0mL concentration is that 2mg/mL, pH value are 6.0 CaCl
2It is in the different carbon nano-tube aqueous solutions of 1.0mg/mL, pH value that the aqueous solution joins 1.0mL concentration.After the room temperature sedimentation 1 hour, use filter paper filtering.Microplate reader is measured the light absorption value of filtrate at the 600nm place, is used to calculate clearance.The filtrate achromaticity and clarification is transparent.
With 1.0mL concentration is that 2mg/mL, pH value are 6.0 CaCl
2It is in the carbon nano-tube aqueous solutions that 1.0mg/mL, pH value are 6.0, ionic strength is different that the aqueous solution joins 1.0mL concentration.After the room temperature sedimentation 1 hour, use filter paper filtering.Microplate reader is measured the light absorption value of filtrate at the 600nm place, is used to calculate clearance.Filtrate achromaticity and clarification transparent (Fig. 2).
Present embodiment explanation pollution system pH and ionic strength do not influence the effect of present method.
Embodiment 3
The removing of carbon nanotube under tensio-active agent and the natural organic matter existence condition: with 1.0mL concentration is that 2mg/mL, pH value are 6.0 CaCl
2It is that 1.0mg/mL, pH value are 6.0, contain in the carbon nano-tube aqueous solutions of different concns tensio-active agent (perhaps natural organic matter) that the aqueous solution joins 1.0mL concentration.After the room temperature sedimentation 1 hour, use filter paper filtering.Microplate reader is measured the light absorption value of filtrate at the 600nm place, is used to calculate clearance.The filtrate achromaticity and clarification is transparent.Exist tensio-active agent and natural organic matter to influence the effect (Fig. 3) of present method substantially in the present embodiment explanation pollution system.
The removing of unmodified carbon nanotube: with 1.0mL concentration is that 2mg/mL, pH value are 6.0 CaCl
2It is that 1.0mg/mL, pH value are in 6.0 the tannic acid dispersive unmodified carbon nano-tube aqueous solutions that the aqueous solution joins 1.0mL concentration.After the room temperature sedimentation 1 hour, use filter paper filtering.Microplate reader is measured the light absorption value of filtrate at the 600nm place, is used to calculate clearance.The filtrate achromaticity and clarification is transparent.Present embodiment illustrates that the pollution of direct dispersed carbon nano tube also can adopt present method to remove (Fig. 3).
Claims (1)
1. the method for a purifying carbon nanotube polluted water body, it is characterized in that the processing step of this method is as follows: with 1.0mL-3.0mL concentration is that 2mg/mL, pH value are 6.0 CaCl
2It is that 1.0mg/mL, pH value are in 6.0 the carbon nano-tube aqueous solutions, to use the vortex mixer mixing that the aqueous solution joins 1.0mL-3.0mL concentration; At room temperature natural subsidence 1-2 hour, after the filtration, obtain water white water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010227840 CN101885527A (en) | 2010-07-15 | 2010-07-15 | Method for purifying carbon nanotube polluted water body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010227840 CN101885527A (en) | 2010-07-15 | 2010-07-15 | Method for purifying carbon nanotube polluted water body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101885527A true CN101885527A (en) | 2010-11-17 |
Family
ID=43071653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010227840 Pending CN101885527A (en) | 2010-07-15 | 2010-07-15 | Method for purifying carbon nanotube polluted water body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101885527A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013158441A1 (en) * | 2012-04-18 | 2013-10-24 | Exxonmobil Upstream Research Company | Removing carbon nanotubes from a water system |
-
2010
- 2010-07-15 CN CN 201010227840 patent/CN101885527A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 《American Chemical Society, Division of Environmental Chemistry》 20070329 P.Lee Ferguson et al AGGREGATION AND SORPTIVE PROPERTIES OF SINGLE-WALLED CARBON NANOTUBES IN THE ESTUARINE ENVIRONMENT 第283页倒数第1-3段，图2 1 , 2 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013158441A1 (en) * | 2012-04-18 | 2013-10-24 | Exxonmobil Upstream Research Company | Removing carbon nanotubes from a water system |
| KR20140145626A (en) * | 2012-04-18 | 2014-12-23 | 엑손모빌 업스트림 리서치 캄파니 | Removing carbon nanotubes from a water system |
| CN104302582A (en) * | 2012-04-18 | 2015-01-21 | 埃克森美孚上游研究公司 | Removing carbon nanotubes from a water system |
| JP2015519280A (en) * | 2012-04-18 | 2015-07-09 | エクソンモービル アップストリーム リサーチ カンパニー | Removal of carbon nanotubes from aqueous systems |
| AU2013249598B2 (en) * | 2012-04-18 | 2016-05-12 | Exxonmobil Upstream Research Company | Removing carbon nanotubes from a water system |
| CN104302582B (en) * | 2012-04-18 | 2017-05-24 | 埃克森美孚上游研究公司 | Removing carbon nanotubes from a water system |
| US9975793B2 (en) | 2012-04-18 | 2018-05-22 | Exxonmobil Upstream Research Company | Removing carbon nanotubes from a water system |
| KR102011642B1 (en) * | 2012-04-18 | 2019-08-19 | 엑손모빌 업스트림 리서치 캄파니 | Removing carbon nanotubes from a water system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6055059B2 (en) | Aggregation method | |
| Aboelfetoh et al. | Binary coagulation system (graphene oxide/chitosan) for polluted surface water treatment | |
| Jumadi et al. | A review of nano-based materials used as flocculants for water treatment | |
| CN109734228A (en) | A kind of compound sewage processing method | |
| CN106336038A (en) | Treatment method for heavy metal-containing polluted wastewater | |
| CN104150741A (en) | Sludge chemical conditioning method and conditioner | |
| Lin et al. | One-step removal of harmful algal blooms by dual-functional flocculant based on self-branched chitosan integrated with flotation function | |
| Kolya et al. | Bio-based polymeric flocculants and adsorbents for wastewater treatment | |
| JP2012217972A (en) | Flocculation treatment method | |
| WO2022236964A1 (en) | Enhanced coagulation method for removing micro-plastics in water | |
| CN112158932B (en) | Magnetic zero-valent iron polyaluminum chloride composite flocculant and preparation method and application thereof | |
| CN101468838A (en) | Method for preparing composite water purification agent | |
| CN113287614A (en) | Red tide algae algaecide based on natural polyphenol modified nano-cellulose and application thereof | |
| CN105837702B (en) | Cation-modified crosslinked guar gum and its preparation method and application | |
| CN102689935A (en) | Method for processing acid mine drainage | |
| CN101885527A (en) | Method for purifying carbon nanotube polluted water body | |
| Dar et al. | Recent advances in adsorption techniques for fluoride removal–An overview | |
| CN109650593B (en) | Urban sewage treatment method | |
| CN110002562A (en) | A kind of sea grass polysaccharide flocculation aid and the preparation method and application thereof | |
| CN103739186B (en) | The method that the modulation of a kind of mud is modified | |
| CN108862515A (en) | A kind of industrial waste water purifying agent and preparation method thereof | |
| Panchu et al. | Bioremediation: Removal of fluoride and methylene blue from water using eco-friendly bio-adsorbents | |
| CN210855649U (en) | Desulfurization waste water is from retrieval and utilization and zero discharge system | |
| CN1515507A (en) | Ecological safety composite type iron system high-effective flocculating agent | |
| CN2861143Y (en) | Treatment device for carbonization produced waste water |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20101117 |