CN101391201B - Zinc oxide nano-rod/ magnalium laminar double-hydroxide preparation method and use thereof - Google Patents
Zinc oxide nano-rod/ magnalium laminar double-hydroxide preparation method and use thereof Download PDFInfo
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- CN101391201B CN101391201B CN2008102011880A CN200810201188A CN101391201B CN 101391201 B CN101391201 B CN 101391201B CN 2008102011880 A CN2008102011880 A CN 2008102011880A CN 200810201188 A CN200810201188 A CN 200810201188A CN 101391201 B CN101391201 B CN 101391201B
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Abstract
The invention relates to a preparation method of a zinc oxide nano-rod/magnesium aluminum layered double hydroxide as well as an application of the compound, and the magnesium aluminum layered double hydroxide prepared by the co-precipitation method is used to disperse the washed layered double hydroxide precipitate in water, dissolvable zinc salt and urea are added thereto, the temperature is elevated, and ammonia generated after urea hydrolysis is utilized to promote the hydrolysis of zinc salt so as to obtain the precipitate of zinc ion. After the precipitate is washed and calcined, the zinc oxide nano-rod/magnesium-aluminum composite oxide is obtained. The zinc oxide nano-rod/magnesium-aluminum composite oxide is soaked in soluble carbonate to get the zinc oxide nano-rod/magnesium aluminum layered double hydroxide. The zinc oxide nano-rod/magnesium aluminum layered double hydroxide and the zinc oxide nano-rod/magnesium-aluminum composite oxide have strong adsorption capacity to anionic dye molecules such as acid red, and after the dye molecules are adsorbed, the dye molecules are decomposed by photocatalysis after the irradiation of ultraviolet light to serve as a composite light catalyst with strong adsorption capacity.
Description
Technical field
The invention belongs to nano composite material preparation and application, particularly relate to a kind of preparation method of zinc oxide nano rod/magnalium laminar double-hydroxide and the application of this compound.
Background technology
Along with deepening continuously of process of industrialization, global environmental pollution is destroying earth biosphere formed ecological balance over several hundred million years day by day, and mankind itself's living environment is constituted a threat to.It is China's current serious environmental problems that faces, particularly anionic organic wastewater that water pollutes, because its kind is many, pollutes widely, has become important surface water and phreatic organic contamination source.
At present just causing people's extensive attention about the research of anionic organic wastewater improvement method.Layered double-hydroxide (layered double hydroxides is called for short LDHs) claims anionic clay or hydrotalcite again.Its basic structure formula is: [M
2+ 1-xM
3+ x(OH)
2]
X+A
M- X/mNH
2O, M
2+And M
3+Represent divalence and Tricationic respectively, A
M-Represent m valency anion.LDHs has the layer structure of similar water magnesite, in the construction unit layer of shepardite, the bivalent cation part is substituted by Tricationic, produces the structure positive charge, enters construction unit interlayer balanced structure positive charge [F.Cavani thereby need to introduce anion, F.Trifiro, A.Vaccari, Catal.Today, 1991, vol.11,173].With LDHs roasting under certain condition, be subjected in the thermal process, because the sloughing and the effusion of volatilization gas of structural hydroxyl, former layered hydroxide structure is destroyed gradually, is converted into new composite oxides.This composite oxides crystal grain is little and even, specific area is big, under certain humidity (or water) and anionic condition, can recover to form LDHs, promptly so-called " memory " function [R.L.Goswamee, P.Sengupta, K.G.Bhattacharyya, D.K.Dutta, Appl.Clay Sci., 1998, vol.13,21].Because this special nature of LDHs, it more and more is subjected to researcher's attention F.Leroux, J.P.Besse, Chem.Mater., 2001, vol.13,3507 as the application of absorption new material in recent years].Although the adsorptivity of layered oxide is very strong, after finishing, reaction the organic anion pollutant of absorption further can't be degraded, can only organic anion be translated into inorganic matter by calcining once more.Pollutant is not really removed in the whole process, just it is shifted from aqueous phase, limited the use of layered oxide on this certain degree.
The photocatalysis characteristic of zinc oxide and titanium dioxide etc. has had extensive studies, and for the waters of pollution in wide area, a large amount of uviol lamps is installed temporarily, and to come the exciting light catalytic process be unpractical.Photocatalysis efficiency is not high, the water body that pollutes is incorporated into eliminates organic pollution in a large number by light-catalyzed reaction in the special photo catalysis reactor and still be difficult at present realize.Zinc oxide nano rod shows photocatalytic activity [Q.Wan, T.H.Wang, J.C.Zhao, Appl.Phys.Lett.2005, vol.87,083105 higher than titanium dioxide nanocrystalline in the photocatalytic degradation reaction of some dyestuffs; Q.H, Zhang, W.G.Fan, L.Gao, Appl.Catal.B, 2007, vol.76,168], with the adsorbent of zinc oxide nano rod and some high adsorption capacities compound after, the organic pollution in the adsorbed water body reclaims adsorbent more faster, eliminate organic pollution and adsorbent is regenerated by photocatalytic process, clear and definite using value is arranged.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of zinc oxide nano rod/magnalium laminar double-hydroxide and the application of composite oxides thereof.The layered double-hydroxide that among the present invention coprecipitation is prepared is dispersed in the water, adds soluble zinc salt and urea, impels zinc salt to be converted into precipitation after the intensification, obtains the compound of zinc ion sediment and magnalium laminar double-hydroxide.By regulating the ratio of zinc salt and layered double-hydroxide, can obtain the different zinc oxide nano rods of forming and the compound of magnalium laminar double-hydroxide.This compound has: characteristics such as adsorptivity is strong, photocatalytic activity is good, behind the adsorpting anion dyestuff, can be by its surperficial zinc oxide nano rod, process mercury lamp etc. contains the light fixture irradiation of ultraviolet light pollutant is further decomposed, thereby thoroughly removes the anionic pollutant in the waste water.This preparation method's technology is simple, is easy to suitability for industrialized production.
The preparation of the nano-complex of zinc oxide nano rod/magnalium laminar double-hydroxide of the present invention comprises step:
(1) coprecipitation prepares magnalium laminar double-hydroxide (Mg-Al-CO
3Layered double hydroxides)
Under the room temperature, take by weighing the magnesium salts and the aluminium salt of solubility by stoichiometric proportion, add water and be stirred to dissolving fully, gained solution is called mixing salt solution; Take by weighing the carbonate and the inorganic base of solubility again, add and be configured to certain density aqueous slkali after water is stirred to fully dissolving, gained solution is called mixed ammonium/alkali solutions; Preceding a kind of solution (mixing salt solution) is dropwise added a kind of solution (mixed ammonium/alkali solutions) lining, back, after dropwising, be warming up to 50～120 ℃, it is dry that reaction 12～48h, water fully wash the back, obtains magnalium laminar double-hydroxide; Wherein, the mol ratio of solubility magnesium salts and aluminium salt is: 1: 1～1: 5, the mol ratio of carbonate and inorganic base was: 1: 1～1: 6;
(2) compound of the sediment/magnalium laminar double-hydroxide of preparation nano bar-shape zinc ion
Under the room temperature, take by weighing the zinc salt and the urea of solubility, add the water stirring and dissolving, in mixed solution, add the magnalium laminar double-hydroxide of washes clean again, stir 10min～120min and get suspension by stoichiometric proportion;
Suspension is warming up to 80～100 ℃, reacts 4～24h, get the compound of the sediment/magnalium laminar double-hydroxide of product nano bar-shape zinc ion;
Wherein, the mol ratio of soluble zinc salt (in zinc oxide) and urea is 1: 10～1: 20, and the mass ratio of soluble zinc salt (in zinc oxide) and magnalium carbonate stratiform double-hydroxide is 1: 10～5: 1.
(3) nano-complex of preparation zinc oxide nano rod/magnalium laminar double-hydroxide
Be cooled to room temperature, collect the product of step (2), behind deionized water and absolute ethanol washing, 60～110 ℃ of oven dry 12～24h, and at 400～600 ℃ of following calcining 2～4h, obtain zinc oxide nano rod/Mg-Al composite oxide, soak 2～24h through the soluble carbon hydrochlorate at 0～50 ℃ again, obtain the nano-complex of zinc oxide nano rod/magnalium laminar double-hydroxide.
The magnesium salts of the solubility in the described step (1) and aluminium salt are respectively magnesium nitrate and aluminum nitrate or magnesium chloride and aluminium chloride; Soluble carbon hydrochlorate and inorganic base are to be respectively sodium carbonate and NaOH or potash and potassium hydroxide.
The zinc salt of the solubility in the described step (2) is a kind of in zinc acetate, zinc nitrate, zinc sulfate, the zinc chloride or their mixture.
Soluble carbon hydrochlorate in the described step (3) is sodium carbonate or potash, and its concentration is in carbanion, and scope is 0.05mol/L～2.0mol/L.
The diameter of the zinc oxide nano rod in the zinc oxide nano rod/magnesium aluminum oxide in the described step (3), the nano-complex of zinc oxide nano rod/magnalium laminar double-hydroxide is in 10～50 nanometers.
Among the present invention, be warmed up in the aqueous solution 80 ℃ or more than, urea decomposes by following chemical equation:
CO(NH
2)
2+H
2O→CO
2↑+2NH
3 (1)
Ammoniacal liquor that produces and carbon dioxide and zinc ion reaction:
CO
2+4NH
3·H
2O+2Zn
2+→Zn
2(OH)
2CO
3↓+4NH
4 ++H
2O (2)
The back basic zinc carbonate that is heated decomposes:
Zn
2(OH)
2CO
3→2ZnO+CO
2↑+H
2O↑ (3)
Simultaneously, Mg-Al-CO
3LDHs can decompose by making following formula:
Mg
1-xAl
x(OH)
2(CO
3)
x/2·yH
2O→Mg
1-xAl
xO
1+x/2+x/2CO
2+(1+y)H
2O (4)
After the soluble carbon acid salt solution soaks, Mg
1-xAl
xO
1+x/2Again change Mg-Al-CO into
3LDHs:
Mg
1-xAl
xO
1+x/2+x/2CO
3 2-+(1+x/2+2)OH
-
→Mg
1-xAl
x(OH)
2(CO
3)
x/2·yH
2O+(1+x/2-y)H
2O (5)
Formula (4) but in layered double-hydroxide decompose list of references (W.S.Yang, Y.M.Kim, P.K.Liu, M.Sahimi, T.T.Tsotsis, Chem.Engineer.Sci., 2002, vol.57,2945), lose the intermediary water molecule about 70～190 ℃, 190～280 ℃ lose hydroxide ion, lose carbanion at 280～450 ℃.Anion in the formula (5) can also be nitrate anion, sulfate radical, phosphate radical, halide ion, can also be the anionic dyestuff, the OH that also it may be noted that except carbanion
-Also can produce, so in neutral solution, also can be transformed into layered double-hydroxide by the mixed oxide hydration.
The application of the nano-complex of zinc oxide nano rod/magnalium laminar double-hydroxide of the present invention is: be adsorbed on the anionic dyestuff that dissolves in the water, by its surperficial zinc oxide nano rod, process mercury lamp etc. contains the light fixture irradiation of ultraviolet light pollutant is further decomposed, thereby thoroughly removes the anionic pollutant in the waste water.
Zinc oxide nano rod/Mg-Al composite oxide is immersed in 2～12h in the Acid Red G solution, can be observed water base become colourless, and be originally white composite powder become redness, show that most of dye molecule is adsorbed in the compound.It is dry that the compound of saturated absorption is reclaimed the back, be dispersed in it in deionized water after, pour into again in the jacket type photo catalysis reactor, open mercury lamp, behind UV-irradiation, the composite powder color shoals gradually.Return to original white at last.The concentration of the compound of adsorpting dye molecule in water is 0.4g/L～20g/L, but bubbling air or oxygen quicken photocatalytic process in the photocatalytic process.
Beneficial effect:
(1) prepared zinc oxide nano rod/Mg-Al composite oxide or zinc oxide nano rod/magnalium laminar double-hydroxide kept the strong characteristics of the adsorptivity ability of adsorbent own, has certain photocatalytic activity simultaneously;
(2) zinc oxide nano rod/magnesium aluminum oxide has very strong adsorption capacity to the anionic dyestuff that dissolves in the water, behind the absorbing dye through UV-irradiation, can be with the dye molecule photocatalytic degradation, the inorganic anion that degraded produces is fixed on the interlayer of magnalium laminar double-hydroxide;
(3) preparation technology simple, to production equipment require low, be easy to suitability for industrialized production.
Description of drawings
Fig. 1 is the X-ray diffractogram of embodiment 1 preparation zinc oxide nano rod/Mg-Al composite oxide;
Fig. 2 is the high-resolution-ration transmission electric-lens photo and the electronic energy spectrum of embodiment 2 preparation zinc oxide nano rod/Mg-Al composite oxides, (a) be the high resolution electron microscopy of zinc oxide nano rod/Mg-Al composite oxide, (b) be the power spectrum of respective regions, zinc element, magnesium elements, aluminium element and oxygen element are wherein arranged, copper wherein and carbon are from doing the copper mesh that Electronic Speculum is used, and the power spectrum peak of zinc is better than magnesium and aluminium greatly;
Fig. 3 is behind the zinc oxide nano rod/Mg-Al composite oxide absorbing dye of example 3 preparation and the infrared spectrum after the photocatalysis,
The material that pairing infrared spectrum is corresponding respectively among the figure is: (a) be magnalium laminar double-hydroxide for having adsorbed Acid Red G zinc oxide nano rod/Mg-Al composite oxide, (c) afterwards through the composite oxides after the photocatalytic degradation, (d) for Acid Red G, (b);
Fig. 4 obtains the X-ray diffractogram of zinc oxide nano rod/magnalium laminar double-hydroxide again with the sodium carbonate reduction for example 4 preparations.
The specific embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Embodiment 1
Take by weighing the 32.00g magnesium nitrate hexahydrate and 23.45g nine water aluminum nitrates join in the 100ml water, be stirred to dissolving fully, stand-by.Other takes by weighing 17.50g sodium carbonate and 22.15g NaOH joins in the 125ml water, is stirred to dissolving fully.The sodium carbonate of gained and the mixed solution of NaOH are poured in the three-neck flask, put into oil bath pan, the mixed solution with magnesium nitrate and aluminum nitrate dropwise is added drop-wise in the three-neck flask again.After dropwising, oil bath pan is heated to 70 ℃, heating rate is 10～20 ℃/min, and temperature is incubated 18h after reaching design temperature.Insulation naturally cools to room temperature after finishing, and pours out product, uses absolute ethanol washing again 3 times 5 times with the distilled water washing, through 110 ℃ of oven dry 24h, obtains magnalium laminar hydroxide.
Take by weighing 2.20g zinc acetate dihydrate and 9.00g urea and join in the 150ml water, stir 5min, the magnalium carbonate stratiform double-hydroxide that takes by weighing the preparation of 0.72g coprecipitation again adds above-mentioned solution, stirs 10min.The solution that will contain magnalium laminar double-hydroxide is poured in the three-neck flask, puts into oil bath pan, begins to be heated to 95 ℃, and heating rate is 10～20 ℃/min, and temperature is incubated 12h after reaching design temperature.Insulation naturally cools to room temperature after finishing, and pours out product, uses absolute ethanol washing again 3 times 5 times with the distilled water washing, through 110 ℃ of oven dry 24h.With powder 500 ℃ of calcining 4h in air, obtain zinc oxide nano rod/Mg-Al composite oxide.
Provided X-ray diffractogram among Fig. 1, the zinc oxide characteristic peak shown in the figure is fairly obvious, and the crystal face that has marked is all corresponding to buergerite phase oxidation zinc, and the magnalium laminar oxide occurs with unbodied form.
Embodiment 2
Take by weighing 1.37g zinc chloride and 9.00g urea and join in the 150ml water, stir 5min, the magnalium laminar double-hydroxide that takes by weighing the preparation of 1.44g coprecipitation again adds above-mentioned solution, stirs 10min.The solution that will contain magnalium laminar double-hydroxide is poured in the three-neck flask, puts into oil bath pan, begins to be heated to 95 ℃, and heating rate is 10～20 ℃/min, and temperature is incubated 12h after reaching design temperature.Insulation naturally cools to room temperature after finishing, and pours out product, uses absolute ethanol washing again 3 times 5 times with the distilled water washing, through 110 ℃ of oven dry 24h.With powder 500 ℃ of calcining 4h in air, obtain zinc oxide nano rod/Mg-Al composite oxide.
Provided the high-resolution-ration transmission electric-lens photo among Fig. 2, can know see zinc oxide be bar-shaped, lattice fringe is clearly arranged, show that zinc oxide has good degree of crystallinity.
Embodiment 3
Take by weighing 11.88g magnesium chloride and 8.35g aluminium chloride and join in the 100ml water solution for later use after the dissolving.Other takes by weighing 28.81g potash and 24.50g potassium hydroxide joins in the 125ml water, is stirred to dissolving fully.The potash of gained and the mixed solution of potassium hydroxide are poured in the three-neck flask, put into oil bath pan, the mixed solution with magnesium chloride and aluminium chloride dropwise is added drop-wise in the three-neck flask again.After dropwising, oil bath pan is heated to 85 ℃, heating rate is 10～20 ℃/min, and temperature is incubated 24h after reaching design temperature.Insulation naturally cools to room temperature after finishing, and pours out product, uses absolute ethanol washing again 3 times 5 times with the distilled water washing, through 110 ℃ of oven dry 24h, obtains magnalium laminar hydroxide.
Take by weighing 3.30g zinc acetate dihydrate and 13.50g urea and join in the 150ml water, stir 5min, the magnalium laminar double-hydroxide that takes by weighing the preparation of 0.72g coprecipitation again adds above-mentioned solution, stirs 10min.The solution that will contain magnalium laminar double-hydroxide is poured in the three-neck flask, puts into oil bath pan, begins to be heated to 90 ℃, and heating rate is 10～20 ℃/min, and temperature is incubated 12h after reaching design temperature.Insulation naturally cools to room temperature after finishing, and pours out product, uses absolute ethanol washing again 3 times 5 times with the distilled water washing, through 110 ℃ of oven dry 24h.With powder 500 ℃ of calcining 4h in air, obtain zinc oxide nano rod/Mg-Al composite oxide.
With 0.30g zinc oxide nano rod/Mg-Al composite oxide adding 1000ml, concentration is in the Acid Red G solution of 40mg/L, stirs 8h, centrifugal after the question response balance, collects powder, through 60 ℃ of vacuum drying 24h, obtains magnalium Acid Red G layered double-hydroxide.
Take by weighing 0.16g magnalium Acid Red G layered double-hydroxide and join in the 400ml deionized water, ultrasonic 5min, aerating oxygen, oxygen gas flow rate are 100ml/min.With the mercury lamp irradiation, cessation reaction behind the 2h is with catalyst recovery.
Fig. 3 has provided behind zinc oxide nano rod/Mg-Al composite oxide absorbing dye and the infrared spectrum after the photocatalysis, as a comparison, has provided the infrared spectrum of Acid Red G and magnalium laminar hydroxide in the lump.Can see among the figure that the characteristic peak of a series of Acid Red Gs has appearred in complex layered oxide after having adsorbed Acid Red G: at 1498cm
-1The place occurred-characteristic peak of N=N-, at 1216cm
-1And 1050cm
-1SO has appearred
3 -Characteristic peak.Through behind the photocatalytic degradation, the characteristic peak of Acid Red G obviously weakens, simultaneously at 1114cm
-1A SO has appearred in the place
4 2-Characteristic peak, thereby the proof Acid Red G is decomposed, and the sulfate radical that produces is fixed in the layered double-hydroxide.
Embodiment 4
Take by weighing 3.73g zinc nitrate hexahydrate and 11.25g urea and join in the 150ml water, stir 5min, the magnalium carbonate stratiform double-hydroxide that takes by weighing the preparation of 0.72g coprecipitation again adds above-mentioned solution, stirs 10min.The solution that will contain magnalium laminar double-hydroxide is poured in the three-neck flask, puts into oil bath pan, begins to be heated to 95 ℃, and heating rate is 10～20 ℃/min, and temperature is incubated 12h after reaching design temperature.Insulation naturally cools to room temperature after finishing, and pours out product, uses absolute ethanol washing again 3 times 5 times with the distilled water washing, through 110 ℃ of oven dry 24h.With powder 500 ℃ of calcining 4h in air, obtain zinc oxide nano rod/Mg-Al composite oxide.
Take by weighing that 3.00g zinc oxide nano rod/Mg-Al composite oxide adds 100ml, concentration is in the sodium carbonate liquor of 1mol/L, stir 24h, after the question response balance, use absolute ethanol washing again 3 times 5 times with the distilled water washing, through 60 ℃ of vacuum drying 24h, obtain zinc oxide nano rod/magnalium laminar double-hydroxide.
Provided X-ray diffractogram among Fig. 4, the characteristic peak of zinc oxide shown in the figure and magnalium laminar double-hydroxide is all very remarkable, the crystal face that has marked is corresponding buergerite phase oxidation zinc and magnalium laminar double-hydroxide respectively, wherein the characteristic peak of the characteristic peak of zinc oxide (002) and magnalium laminar hydroxide (009) is overlapping, makes the peak in this piece zone strong thereby strengthened.
Claims (5)
1. the preparation method of the nano-complex of a zinc oxide nano rod/magnalium laminar double-hydroxide comprises step:
(1) under the room temperature, take by weighing the magnesium salts and the aluminium salt of solubility, add water and be stirred to dissolving fully by stoichiometric proportion, mixing salt solution; Take by weighing the carbonate and the inorganic base of solubility again, add and be configured to aqueous slkali after water is stirred to fully dissolving, mixed ammonium/alkali solutions; Mixing salt solution is dropwise added in the mixed ammonium/alkali solutions, after dropwising, be warming up to 50～120 ℃, it is dry that reaction 12～48h, water fully wash the back, obtains magnalium laminar double-hydroxide; Magnesium ion and aluminum ions mol ratio are in the described mixing salt solution: 1: 1～1: 5, the mol ratio of carbonate and inorganic base was: 1: 1～1: 6; The magnesium salts of solubility and aluminium salt are respectively magnesium nitrate and aluminum nitrate or magnesium chloride and aluminium chloride; Soluble carbon hydrochlorate and inorganic base are respectively sodium carbonate and NaOH or potash and potassium hydroxide;
(2) under the room temperature, take by weighing the zinc salt and the urea of solubility by stoichiometric proportion, add the water stirring and dissolving, in mixed solution, add magnalium laminar double-hydroxide again, stir 10min～120min and get suspension, suspension is warming up to 80～100 ℃, reacts 4～24h, get the compound of the sediment/magnalium laminar double-hydroxide of product nano bar-shape zinc ion; The consumption of described soluble zinc salt all is to calculate with zinc oxide, and wherein, the mol ratio of zinc oxide and urea is 1: 10～1: 20, and the mass ratio of zinc oxide and magnalium carbonate stratiform double-hydroxide is 1: 10～5: 1;
(3) be cooled to room temperature, collect the product of step (2), behind deionized water and absolute ethanol washing, 60～110 ℃ of oven dry 12～24h, and at 400～600 ℃ of following calcining 2～4h, obtain zinc oxide nano rod/Mg-Al composite oxide, soak 2～24h through the soluble carbon hydrochlorate at 0～50 ℃ again, obtain the nano-complex of zinc oxide nano rod/magnalium laminar double-hydroxide.
2. the preparation method of the nano-complex of a kind of zinc oxide nano rod/magnalium laminar double-hydroxide according to claim 1 is characterized in that: the zinc salt of the solubility in the described step (2) is a kind of in zinc acetate, zinc nitrate, zinc sulfate, the zinc chloride or their mixture.
3. the preparation method of the nano-complex of a kind of zinc oxide nano rod/magnalium laminar double-hydroxide according to claim 1, it is characterized in that: the soluble carbon hydrochlorate in the described step (3) is sodium carbonate or potash, its concentration is in carbanion, and scope is 0.05mol/L～2.0mol/L.
4. the preparation method of the nano-complex of a kind of zinc oxide nano rod/magnalium laminar double-hydroxide according to claim 1, it is characterized in that: the diameter of zinc oxide nano rod is in 10～50 nanometers in the zinc oxide nano rod/magnesium aluminum oxide in the described step (3), the zinc oxide nano rod/magnalium laminar double-hydroxide.
5. the purposes in the anionic dyestuff that in being adsorbed on water, dissolves of the nano-complex of zinc oxide nano rod/magnalium laminar double-hydroxide of obtaining of the preparation method of the nano-complex of a kind of zinc oxide nano rod/magnalium laminar double-hydroxide according to claim 1, it is characterized in that: by its surperficial zinc oxide nano rod, through the light fixture irradiation that contains ultraviolet light pollutant is further decomposed, thoroughly remove the anionic pollutant in the waste water.
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