CN103007871A - Application of barium sulfate nano-particle and aggregate of barium sulfate nano-particle in CrO4<2-> absorption - Google Patents

Application of barium sulfate nano-particle and aggregate of barium sulfate nano-particle in CrO4<2-> absorption Download PDF

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CN103007871A
CN103007871A CN2012104934571A CN201210493457A CN103007871A CN 103007871 A CN103007871 A CN 103007871A CN 2012104934571 A CN2012104934571 A CN 2012104934571A CN 201210493457 A CN201210493457 A CN 201210493457A CN 103007871 A CN103007871 A CN 103007871A
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陈庆德
沈兴海
申国华
赵洪凯
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Abstract

The invention discloses application of barium sulfate nano-particle and aggregate of barium sulfate nano-particle in CrO4<2-> absorption. In a high salinity environment, a barium sulfate nano-particle and aggregate of the barium sulfate nano-particle perform selective exchange adsorption on CrO4<2-> in neutral and basic solutions, and the adsorption capacity increases along with increase of adsorbent amount. Due to selective adsorption to CrO4<2->, the barium sulfate nano-particle and aggregate of the barium sulfate nano-particle is expected to become a novel inorganic ion-exchange material for extracting chromium in CrO4<2->-containing wastewater, chrome ore, chrome ore tailings and chrome ore slag.

Description

Barium sulfate nanoparticles and aggregation thereof are at absorption CrO 42-In application
Technical field
The present invention relates to a kind of barium sulfate nanoparticles and aggregation thereof at absorption CrO 4 2-In application.
Background technology
Barium sulfate (BaSO 4), be commonly called as barite, think traditionally typical inert substance, be commonly used for reflecting coating of filler in catalyst carrier, medical developer, macromolecular material and the pigment and additive, optics etc.In addition, the twenties in 20th century, it once was used to radioactivity Ra 2+Absorption; But because absorption is extremely micro-, only have 5 * 10 -5Mg/g, and fail to be widely used.Recently, bibliographical information is arranged, with load the porous BaSO of neopelex 4Liquidity limit dyestuff and continuation organic pollution (Lin, J. from sewage; Gao, H.W., J.Mater.Chem.2009,19,3598.).At this, BaSO 4Or be used as adsorbing agent carrier because of its inertia.As everyone knows, the character of nano material (Burda, C.s significantly different from the respective masses material; Chen, X.B.; Narayanan, R.; El-Sayed, M.A., Chem.Rev.2005,105,1025.).At present, to nanometer BaSO 4Research mainly concentrate on crystal growth aspect (for example, pattern regulation and control, growth mechanism and mesomorphic formation) (Colfen, H.; Antonietti, M., Angew.Chem.-Int.Edit.2005,44,5576.).Block BaSO 4Inertia, nanometer BaSO 4Whether have chemical reactivity, yet there are no relevant report.
Chromium is a kind of important transition metal, has a wide range of applications in the industry such as plating, leather tanning, pigment, but has also caused simultaneously serious pollution.Chromium mainly contains Cr (III) and two kinds of valence states of Cr (VI).In upper earth and natural water body, Cr (III) is precipitated out in the mode of hydroxide usually, is difficult for diffusion, the harm less; Cr (VI) is mainly with CrO 4 2-Form exists because its oxidisability is very weak, can be in environment long-term stable existence, and spread with water, to human body and vegeto-animal very harmful (Venditti, F.; Cuomo, F.; Ceglie, A.; Ambrosone, L.; Lopez, F., J.Hazard.Mater.2010,173,552.).In addition, in the exploitation of chrome ore, refining, also can run into a large amount of CrO 4 2-Separation, issues of purification.At present, to CrO 4 2-Removal mainly adopt the methods such as ion-exchange absorption, precipitation and counter-infiltration.Wherein, the most economical, convenient with ion-exchange absorption, non-secondary pollution.At present, the most commonly used with various anion exchange resin.But because its ion-exchange non-selectivity, and be subject to severe jamming (Zhang, the Y.W. of salinity and impurity anion; Xu, L.; Zhao, L.; Peng, J.; Li, C.C.; Li, J.Q.; Zhai, M.L., Carbohydr.Polym.2012,88,931.), remain the research and development of novel ion-exchange material.
Summary of the invention
The new purposes that the purpose of this invention is to provide a kind of barium sulfate nanoparticles and aggregation thereof.
The new purposes of barium sulfate nanoparticles provided by the present invention and aggregation thereof is that they are at absorption CrO 4 2-In application.
Utilize barium sulfate nanoparticles and aggregation thereof absorption CrO 4 2-Characteristic, with CrO 4 2-Application in the association areas such as separation, extraction all belongs to protection scope of the present invention.As barium sulfate nanoparticles and aggregation thereof are used for containing CrO 4 2-CrO in the waste water 4 2-Extraction and chrome ore, chrome ore mine tailing, chrome ore slag in the wet method of chromium extract.
Wherein, the wet method of chromium is extracted specific as follows in chrome ore, chrome ore mine tailing, the chrome ore slag: adopt the aqueous solution that baked chrome ore, chrome ore mine tailing, chrome ore slag are carried out lixiviate, CrO 4 2-Enter in the aqueous solution; With CrO 4 2-After foreign ion separates, can obtain crome metal by methods such as electrolysis, or for the preparation of chromate.
Barium sulfate nanoparticles of the present invention, its particle diameter can be 1-500nm.This barium sulfate nanoparticles can obtain or prepare according to the method for document by commercial sources, such as list of references: Bala, H.; Fu, W.; Zhao, J.; Ding, X.; Jiang, Y.; Yu, K.; Wang, Z.ColloidsandSurfacesA, 2005,252,129.
Barium sulfate nanoparticles aggregation of the present invention refers to the barium sulfate particulate of the different-shape that is gathered into by barium sulfate nanoparticles.
Described barium sulfate nanoparticles aggregation specifically comprises barium sulfate mesopore microballoon etc.
Described barium sulfate mesopore microballoon is solid, and its particle diameter can be 0.5-50 μ m, and the aperture can be 1-200nm.
Described barium sulfate mesopore microballoon is by the S in the gamma-radiation irradiation reductive water solution 2O 8 2-Prepared by torispherical BaSO 4The mesopore microballoon that nano particle is assembled into.
Concrete grammar is as follows: with Ba (NO 3) 2, K 2S 2O 8With the aqueous solution of disodium ethylene diamine tetraacetate, and make Ba (NO in the mixed liquor 3) 2, K 2S 2O 8Be followed successively by 4mmol/L, 4mmol/L and 8mol/L with the concentration of disodium ethylene diamine tetraacetate, described mixed liquor is moved in the irradiation tube, tube sealing behind the air in the logical nitrogen eliminating system, warp 60Co gamma-radiation irradiation obtains white precipitate, and after precipitation was washed with water, the vacuum drying at room temperature obtained described barium sulfate mesopore microballoon; Wherein, the close rate of described irradiation is 20Gy/min-200Gy/min, and absorbed dose of radiation is 6kGy.
Described barium sulfate nanoparticles aggregation can prepare according to the method for different documents the aggregation of different-shape, such as list of references: Chen, Q.D.; Bao, H.Y.; Shen, X.H.Radiat.Phys.Chem., 2008,77,974.
A further object of the present invention provides CrO in a kind of adsorbed water 4 2-Method.
CrO in the adsorbed water provided by the present invention 4 2-Method, be with barium sulfate nanoparticles or its aggregation with contain CrO 4 2-Aqueous solution after, under the room temperature concussion more than 1 hour.
Wherein, the described CrO that contains 4 2-The pH value 〉=6 of the aqueous solution.
The described CrO that contains 4 2-The aqueous solution in except containing CrO 4 2-Salt and other common anion that also can contain high concentration outward.The salt of this high concentration and the existence of other anion can't affect CrO 4 2-Adsorption effect.
In the environment of high salinity, barium sulfate nanoparticles and assemble the optionally CrO in the neutral and alkaline solution of exchange adsorption of physical efficiency 4 2-, its adsorption capacity increases with the increase of absorbed dose of radiation.BaSO 4The nanometer of particle is its main cause with adsorption activity.This type of BaSO 4Microballoon is expected to become a kind of novel inorganic ion exchange material.
Description of drawings
Fig. 1 is gained sample (A, B) and the SEM photo of absorption rear (D) and TEM photo (C) of the front microballoon fragment of absorption before absorption when radiation dose rate is 200Gy/min among the embodiment 1.
Fig. 2 is the different B aSO of embodiment 1 preparation 4The N of sample 2Absorption (solid)-desorb (hollow) isothermal curve, wherein, 1.200Gy/min; 2.100Gy/min; 3.20Gy/min, not ageing; Illustration is above-mentioned different B aSO 4The graph of pore diameter distribution of sample.
Fig. 3 is the front BaSO of absorption 4Microballoon (close rate: XPS spectrum figure 200Gy/min).
Fig. 4 is the front BaSO of absorption 4Microballoon (close rate: XRD spectra 200Gy/min).
Fig. 5 is the different B aSO of embodiment 1 preparation 4The adsorption time curve 1.200Gy/min of sample; 2.100Gy/min; 3.20Gy/min, not ageing; 4.20Gy/min, ageing 24h; 5. commodity BaSO 4
Fig. 6 is CrO 4 2-Concentration is to the BaSO of embodiment 1 preparation 4Microballoon (close rate: the 200Gy/min) impact of adsorption capacity.(adsorption conditions: BaSO 410mg, each 15mL of liquor capacity, equilibration time 24h)
Fig. 7 is that the pH value is to the BaSO of embodiment 1 preparation 4Microballoon (close rate: 200Gy/min) absorption CrO 4 2-Impact.
Fig. 8 is that NaCl concentration is to the BaSO of embodiment 1 preparation 4Microballoon (close rate: the 200Gy/min) impact of adsorption capacity.
Fig. 9 is BaSO 4Microballoon (close rate: 200Gy/min) to the absorption of some Common Anions.
Figure 10 is the BaSO of embodiment 2 preparations 4The SEM photo (A) of nanometer particle congery and the TEM photo (B) of fragment thereof.
Figure 11 is the TEM photo of the barium sulfate nanoparticles of embodiment 3 preparations.
Figure 12 is the BaSO of Comparative Examples 1 preparation 4The TEM of crystallite (A) and SEM (B) photo (illustration is the SEAD photo)
The specific embodiment
The present invention will be described below by specific embodiment, but the present invention is not limited thereto.
Experimental technique described in the following embodiment if no special instructions, is conventional method; Described reagent and material if no special instructions, all can obtain from commercial channels.
Preparation and the absorption property thereof of embodiment 1, barium sulfate mesopore microballoon
Experimental technique:
With Ba (NO 3) 2, K 2S 2O 8And after the aqueous solution of disodium ethylene diamine tetraacetate (EDTA), with three water constant volumes, make the concentration of above-mentioned solute be respectively 4mmol/L, 4mmol/L and 8mol/L.The pH value of this aqueous solution is 4.51.Mentioned solution is moved in the irradiation tube logical high-purity N 220min with the air in the eliminating system after tube sealing, place the cobalt source to shine, absorbed dose of radiation is 6kGy.Solution obtains white precipitate behind irradiation.This precipitation is after three water fully wash, and vacuum drying at room temperature 24 hours gets white powder, and is for subsequent use.
Take by weighing BaSO 4Powder places conical flask, adds the adsorption liquid of certain volume, and is airtight, vibrates under room temperature.Centrifugal, get supernatant liquor, detect single CrO with ultraviolet-visible spectrum 4 2-CrO in the adsorption liquid 4 2-Concentration, detect the concentration of each ion in the mixing and absorption liquid with ICP-AES; For SO 4 2-The mensuration of concentration then adopts the chromatography of ions.
Measure BaSO by the quick specific surface of ASAP-2010 and pore size distribution determining instrument 4The N of powder 2The absorption-desorption isothermal curve, and analyze.With the BaSO before and after the absorption 4Powder is scattered in three water.The sample dispersion drop of gained is being placed on the copper mesh on the filter paper, with the magnificent film in side, drying makes electron microscopic sample under room temperature, with JEOLJEM-200CX type transmission electron microscope (TEM, operating voltage: 160kV) with Hitachi S-4800 type ESEM (SEM, operating voltage: 0.3kV) observe its pattern.The particle diameter of particle distributes by the statistics more than the size of 100 particles on the electromicroscopic photograph is determined.In addition, the sample dispersion drop after enrichment on the slide and drying, (is used Cu-K with the D/MAX-PC2500X-x ray diffractometer x αTarget, λ=0.154056nm) measure its powder x-ray diffraction (XRD) spectrum (uses Al-K with Kratos Axis energy disperse spectroscopy αTarget) measures its x-ray photoelectron spectroscopy (XPS).The result:
1, BaSO 4Synthesizing of mesopore microballoon
Fig. 1 is close rate gained sample SEM and TEM image before and after absorption when being 200Gy/min.Shown in Figure 1A, except a small amount of fragment, sample is that the microballoon of 2-5 μ m forms by particle diameter.By one more the SEM image (Figure 1B) of high-amplification-factor can know and find out that thus obtained microsphere is solid.Yet, its N 2Absorption-desorption thermoisopleth (Fig. 2) shows that it has central hole structure, the aperture be 4nm (illustration, Fig. 2).Corresponding XPS analysis (Fig. 3) shows: the combination of Ba 3d, S 2p and O 1s can be respectively 779.51,168.16 and 531.11eV, with the BaSO that reports in the document 4Corresponding numerical value close (Moulder, J.F.; Stickle, W.F.; Sobol, P.E.; Bomben, K.D., InHandbook of X-ray photoelectron spectroscopy, Perkin Elmer Physical Electronics Division:Eden, 1992).In addition, XPS analysis is the result also show: the ratio of the amount of substance of Ba, S and O is 1.0: 0.9: 4.1, in the experimental error scope and BaSO 4Stoichiometric proportion close.Thus, can tentatively infer BaSO 4Generation.
The XRD analysis result shows: the XRD spectra of gained sample (Fig. 4) and monocline BaSO 4The standard x RD spectrogram of crystal conforms to, and has further confirmed BaSO 4Generation.In addition, the broadening of each diffraction maximum various degrees is hinting BaSO in the XRD spectra 4Microballoon is comprised of nano particle.In water, ultrasonic oscillation is 1 hour under the room temperature condition with the gained sample dispersion for we, produces the sample of TEM test usefulness.TEM image (Fig. 1 C) is clear to be shown: some microballoons have resolved into the fragment by many torispherical nano particles.This has just confirmed our supposition.
2, BaSO 4The absorption property of mesopore microballoon
With different B aSO 4Sample (1.200Gy/min; 2.100Gy/min; 3.20Gy/min, not ageing; 4.20Gy/min, ageing 24h; 5. commodity BaSO 4) carrying out adsorption test, adsorption conditions is as follows: BaSO 4Sample 15mg, each 25mL of liquor capacity, CrO 4 2-Concentration 0.3mM.
The adsorption kinetic data demonstration of sample, close rate is BaSO synthetic under the 200Gy/min condition 4Microballoon can adsorb CrO 4 2-, adsorption process meets intends the second-order kinetics model, and 24h can reach adsorption equilibrium (Fig. 5, table 1) substantially.Along with the decline of close rate, prepared BaSO 4Adsorption capacity and the rate of adsorption of microballoon obviously descend.The decline of close rate, (illustration, Fig. 2), just the specific area of microballoon is from 59.2m not cause the variation in microballoon aperture 2/ g is down to 55.6 successively, 50.6m 2/ g, the BaSO of composition microballoon 4It is large that the particle diameter of nano particle becomes.When close rate is BaSO synthetic under the 20Gy/min condition 4Microballoon is ageing 24h in mother liquor, and its aperture increases to 35nm (Chen, Q.D. from 4nm; Shen, X.H., Cryst.Growth Des.2010,10,3838.), its rate of adsorption is obviously accelerated (table 1); Consist of the BaSO of microballoon 4Nano particle then is grown to serve as irregular club shaped structure from torispherical, and it is large that particle diameter becomes, and specific area is down to 25.6m 2/ g, its adsorption capacity significantly descends.Commodity BaSO 4Particle diameter reach micron up to a hundred, it is to CrO 4 2-Hardly absorption (Fig. 5).This shows BaSO 4The nanometer of particle is its main cause with adsorption activity.
Table 1 different B aSO 4The plan second-order kinetics simulation of sample adsorption time curve
Figure BDA00002479425800051
Annotate: the numbering 1.200Gy/min of sample; 2.100Gy/min; 3.20Gy/min,
Not ageing; 4.20Gy/min, ageing 24h.
Adopting close rate is BaSO synthetic under the 200Gy/min condition 4Microballoon is to the CrO of variable concentrations 4 2-Solution adsorbs, to investigate CrO 4 2-Concentration is to BaSO 4The impact of microballoon adsorption capacity.Adsorption conditions is as follows: BaSO 410mg, each 15mL of liquor capacity, equilibration time 24h.The adsorption capacity experimental result (Fig. 6) of sample shows this BaSO 4Microballoon is to CrO 4 2-Absorption meet the Langmuir model, maximum equilibrium adsorption capacity is 66.7mg/g, has reached exchange capacity (0.15-256mg/g) (Qiu, the J.Y. of general anion exchange resin; Wang, Z.Y.; Li, H.B.; Xu, L.; Peng, J.; Zhai, M.L.; Yang, C.; Li, J.Q.; Wei, G.S., J.Hazard.Mater.2009,166,270.).Chromatography of ions is found the analysis of absorption clear liquid, after the absorption, has been occurred SO in the clear liquid 4 2-, the increase of its concentration and CrO 4 2-The reduction of concentration can coincide well.This explanation, BaSO 4SO in the microballoon 4 2-With CrO 4 2-The anion exchange absorbing process has occured.
Adopting close rate is BaSO synthetic under the 200Gy/min condition 4Microballoon is to the CrO of different pH values 4 2-Solution adsorbs, to investigate the pH value to BaSO 4The impact of microballoon adsorption capacity.Adsorption conditions: BaSO 410mg, each 10mL of liquor capacity, CrO 4 2-Concentration 0.5mM, equilibration time 24h; The pH value of solution is by rare HNO 3Or KOH regulates.The pH value on absorption the experimental result (Fig. 7) that affects show, along with the increase of pH, this microballoon increases gradually to the adsorption capacity of Cr (VI); When pH 〉=6, adsorption capacity substantially no longer changes.This is because in acidic aqueous solution, Cr (VI) is mainly with Cr 2O 7 2-And HCrO 4 -Form have both and CrO 4 2-There is dissociation equilibrium; And in neutrality and alkaline aqueous solution, CrO 4 2-Cause for the main existence form of Cr (VI).
For the anion exchange resin of routine, because its ion-exchange non-selectivity, and be subject to the severe jamming of salinity and impurity anion, adsorption capacity significantly descend (Zhang, Y.W.; Xu, L.; Zhao, L.; Peng, J.; Li, C.C.; Li, J.Q.; Zhai, M.L., Carbohydr.Polym.2012,88,931.).Adopting close rate is BaSO synthetic under the 200Gy/min condition 4Microballoon is to containing the CrO of different N aCl 4 2-Solution adsorbs, to investigate NaCl concentration to BaSO 4The impact of microballoon adsorption capacity.Adsorption conditions: BaSO 415mg, each 20mL of liquor capacity, CrO 4 2-Concentration 0.5mM, equilibration time 24h.Above-mentioned adsorption experiment is then found, this BaSO 4Microballoon is to CrO 4 2-Absorption not only be not subjected to the inhibition of NaCl, (Fig. 8) on the contrary to some extent rises.
Adopting close rate is BaSO synthetic under the 200Gy/min condition 4Microballoon is to the absorption of some Common Anions, adsorption conditions: BaSO 410mg, mixed liquor volume 15mL, each anion concentration 0.05mM, equilibration time 24h.At CrO 4 2-In the in twos mixed solution of some Common Anions, this BaSO 4Microballoon is to CrO 4 2-Adsorption capacity be significantly higher than other anion (Fig. 9), and substantially be not subjected to the impact of anion species, have good selective.CrO as for absorption 4 2-, can come wash-out by dilute sulfuric acid, eluting rate＞98%.This type of BaSO 4Microballoon is expected to become a kind of novel inorganic ion exchange material and is used for containing CrO 4 2-The extraction of chromium in waste water and chrome ore, chrome ore mine tailing, the chrome ore slag.The preparation of embodiment 2, barium sulfate nanoparticles aggregation and absorption property thereof
List of references (Chen, Q.D.; Bao, H.Y.; Shen, X.H.Radiat.Phys.Chem., 2008,77,974.) the synthetic a kind of barium sulfate nanoparticles aggregation of method, concrete grammar is as follows:
Through N 2(absorbed dose of radiation is 6kGy to gamma-radiation irradiation under the atmosphere; Close rate is 20Gy/min) 4mmol/LK 2S 2O 8In 8mmol/L EDTA mixed solution, add a certain amount of Ba (NO 3) 2, making its concentration is 4mmol/L, mixing get white precipitate, and lucifuge leaves standstill 300min under room temperature rapidly.Precipitation after three water repeatedly wash, in vacuum drying oven the decompression, drying at room temperature.The SEM photo of product and the TEM photo of fragment thereof are as shown in figure 10.
Adsorption experiment: take by weighing the 10mg sample and place conical flask, add 15ml 0.5mmol/L CrO 4 2-Adsorption liquid in, airtight, 24h vibrates under room temperature.Detect through ultraviolet-visible spectrum, under this condition, this sample is to CrO 4 2-Adsorption capacity be 26.9mg/g.
The preparation of embodiment 3, barium sulfate nanoparticles and absorption property thereof
List of references (Bala, H.; Fu, W.; Zhao, J.; Ding, X.; Jiang, Y.; Yu, K.; Wang, Z.Colloidsand Surfaces A, 2005,252,129.) the synthetic barium sulfate nanoparticles of method, concrete grammar is as follows:
1. weighing 0.01mol barium chloride dihydrate is dissolved in the 20mL water, adds the 20mL absolute ethyl alcohol again, places there-necked flask; 2. weighing 0.01mol ammonium sulfate is dissolved in the 10mL water, places dropping funel, stirs lower to solution in one the speed adding 1 in 3 seconds; 3. post processing: centrifugal, use afterwards absolute ethanol washing three times.After natural drying, calcination 1h in 200 ℃ of Muffle furnaces.The TEM photo of products therefrom as shown in figure 11.As seen from the figure, product is that particle diameter is the nano particle of 1-500nm.
Adsorption experiment: take by weighing the 10mg sample and place conical flask, add 15ml 0.5mmol/L CrO 4 2-Adsorption liquid in, airtight, 24h vibrates under room temperature.Centrifugal, get supernatant liquor, detect with ultraviolet-visible spectrum, under this condition, this sample is to CrO 4 2-Adsorption capacity reach 35.9mg/g.
The preparation of Comparative Examples 1, barium sulfate crystallite and absorption property thereof
List of references (Chen, Q.D.; Shen, X.H.Cryst.Growth Des., 2010,10,3838.) the synthetic barium sulfate crystallite of method, concrete grammar is as follows:
With Ba (NO 3) 2And K 2S 2O 8Aqueous solution after, with three water constant volumes, make the concentration of above-mentioned solute be respectively 4mmol/L.Mentioned solution is moved in the irradiation tube logical high-purity N 220min with the air in the eliminating system after tube sealing, place the cobalt source to shine, absorbed dose of radiation is 20kGy, close rate is 20Gy/min.Precipitation after three water repeatedly wash, in vacuum drying oven the decompression, drying at room temperature.The TEM of product (A) and SEM (B) photo and corresponding SEAD photo are as shown in figure 12.SEAD is typical single crystal diffraction style, and what confirmation was synthesized is micron-sized monocrystalline.
Adsorption experiment: take by weighing the 10mg sample and place conical flask, add 15ml 0.5mmol/L CrO 4 2-Adsorption liquid in, airtight, 24h vibrates under room temperature.The ultraviolet-visible spectrum detection display, this sample is to CrO 4 2-Not significantly absorption.
Conclusion: only have as can be known BaSO by above-described embodiment 4Nano particle and aggregation thereof are to CrO 4 2-Obvious absorption is arranged.
Although the present invention is illustrated with reference to accompanying drawing and preferred embodiment,, for a person skilled in the art, the present invention can have various modifications and variations, such as BaSO 4The structure of nanometer particle congery and the variation of pattern.Various change of the present invention, variation and equivalent are contained by the content of appending claims.

Claims (7)

1. barium sulfate nanoparticles and aggregation thereof are at absorption CrO 4 2-In application.
2. application according to claim 1 is characterized in that: described being applied as in extraction contains CrO 4 2-The application of chromium in the water body.
3. application according to claim 1 is characterized in that: the described application that is applied as chromium in extracting chrome ore, chrome ore mine tailing or chrome ore slag.
4. each described application according to claim 1-3 is characterized in that: the particle diameter of described barium sulfate nanoparticles is 1-500nm.
5. one kind is utilized CrO in barium sulfate nanoparticles and the aggregation adsorbed water thereof 4 2-Method, be with described barium sulfate nanoparticles or its aggregation with contain CrO 4 2-Aqueous solution after, under the room temperature concussion more than 1 hour.
6. method according to claim 5 is characterized in that: the described CrO of containing 4 2-The pH value 〉=6 of the aqueous solution.
7. according to claim 5 or 6 described methods, it is characterized in that: the particle diameter of described barium sulfate nanoparticles is 1-500nm.
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CN110028125A (en) * 2019-04-25 2019-07-19 郑州大学 A method of water body intermediate ion state organic matter is separated by carrier adsorption of waste residue source nanoparticle
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