CN103752302A - Nanometer photo-catalyst for killing blue-green algae in water - Google Patents
Nanometer photo-catalyst for killing blue-green algae in water Download PDFInfo
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- CN103752302A CN103752302A CN201310748578.0A CN201310748578A CN103752302A CN 103752302 A CN103752302 A CN 103752302A CN 201310748578 A CN201310748578 A CN 201310748578A CN 103752302 A CN103752302 A CN 103752302A
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Abstract
The invention provides a nanometer photo-catalyst for killing blue-green algae in water and relates to the nanotechnology field. The nanometer photo-catalyst for killing the blue-green algae in the water comprises a nanometer-level zinc oxide hexagonal crystal (ZnO) and a calcium oxide cubic crystal (CaO), wherein the mass percent of the calcium oxide cubic crystal (CaO) is less than or equal to 5%. The nanometer photo-catalyst for killing the blue-green algae in the water, provided by the invention, can be used for increasing the speed of oxidation reaction of the blue-green algae in the water under the irradiation of natural sunlight; the speed can reach 1.4-1.8 times as much as the speeds of oxidation and degradation reactions of the blue-green algae without adding any catalyst according to different conditions; the nanometer photo-catalyst is applicable to operation in a large-scale water area; products generated by the catalytic reaction are water, carbon dioxide gas, nitrogen and inorganic phosphate precipitate; the environment of a water body and the biological balance cannot be influenced, so that the blue-green algae in the water body can be deeply killed in an efficient and environment-friendly manner.
Description
Technical field
The present invention relates to field of nanometer technology, relate in particular to the nano-photocatalyst of blue-green algae in a kind of killing water.
Background technology
Blue-green algae is a kind of simple, original unicellular organism, be grown in nature fresh water. because freshwater resources are in recent years subject to serious organic contamination, make nitrogen wherein, phosphorus content exceeds standard, the Eutrophic Extent of water body promotes rapidly. and these factors necessary condition of blue algae growth breeding just, making the water resource polluted occur blue-green algae amount reproduction under certain weather conditions and destroy " blue-green alga bloom " phenomenon of ecological environment. blue-green alga bloom not only can luxus consumption water oxygen gas and cause the hypoxia death of fish and shrimp, more seriously, also can discharge cyanophycean toxin. these toxin are except directly to fish, outside people and animals etc. produce and poison, also be the major incentive that liver cancer occurs, thereby have a strong impact on the life and health of water environment surrounding population.
Current, the method for administering blue-green algae has by artificial or machinery fishes for the physical method of blue-green algae; Spray the chemical method that chemicals kills blue-green algae; And introduce living species and remove the biological method of blue-green algae. still, physical method cost artificial or that machinery is fished for is high, efficiency is low, being not suitable in the application of large waters. the chemical method of spraying chemicals can change the ecological balance of water body, water biological species and aquatic products economy are caused to adverse effect. biological method not only requires weather conditions harshness, and can destroy original ecological balance, cause the deterioration on the other hand of water environment.
Summary of the invention
The object of this invention is to provide a kind of nano-photocatalyst that gets final product killing blue algae by illumination.
In order to solve existing problem in background technology, catalyst of the present invention is by the following technical solutions: it comprises nano level zinc oxide hex crystal (ZnO), calcium oxide cubic crystal (CaO), mass percent≤5% of described calcium oxide cubic crystal (CaO).
Preferably, in described catalyst, also can contain by between partial oxidation zinc hex crystal (ZnO) and the lattice of calcium oxide cubic crystal (CaO), under external force abrasive action, the distortion of appearance and complex ZnO-CaO mutual cross-linked and that form.
Preferably, described zinc oxide hex crystal (ZnO), calcium oxide cubic crystal (CaO), and the particle diameter of the complex ZnO-CaO that forms between the two of zinc oxide hex crystal (ZnO) and calcium oxide cubic crystal (CaO) in 10 nanometers between 100 nanometers, average grain diameter is the powder body material of 15 nanometer to 25 nanometers.
The nano-photocatalyst of blue-green algae in killing water of the present invention, under the irradiation of natural daylight, can improve the speed that blue-green algae in water carries out oxidation reaction, according to different condition, can reach the 1.4--1.8 of blue-green algae oxidative degradation speed while not adding any catalyst doubly, be applicable to the operation in large-scale waters, its catalytic reaction products is water, carbon dioxide, nitrogen and inorganic phosphate sediment, do not affect water body environment and the ecological balance, thereby efficient, the environmental protection ground degree of depth is killed the blue-green algae in water body, concrete Heterosis is as follows:
1. the catalyst the present invention relates to, under natural daylight irradiates, can be activated, thus the oxidation reaction of catalysis blue-green algae, energy-conserving and environment-protective.
2. catalyst utilizes airborne oxygen and blue-green algae to carry out oxidation reaction, and raw material abundance, need not cost.
3. as catalyst, in catalytic reaction process, can not be consumed, long service life, with low cost.
4. catalytic component is nano grade inorganic mineral, and it presents microgravity phenomenon, can be suspended in water body top layer, and specific area is large, and with blue-green algae, oxygen and daylight fully contact, and reaction speed is fast, and efficiency is high.
5. the product after its catalysis blue-green algae oxidation reaction is water, carbon dioxide, nitrogen and inorganic phosphate sediment. wherein nitrogen is the main component in atmosphere, but not ammonia-nitrogen class gas, therefore odorless, nonhazardous; The inorganic phosphate generating is water insoluble, finally with solid forms, sinks under water.
6. catalyst is all nontoxic to fish and shrimp aquatic products and people and animals, can not be harmful to the acidity and the oxygen content that have influence on water body, also can not change water body electrical conductivity.
7. through instrument, detect and also can assert, carrying out when catalytic oxidation kills blue-green algae reaction, the concentration of total nitrogen in water body, total phosphorus, ammonia-nitrogen, COD is also all reduction situation, thereby has suppressed the eutrophication of water body.
Accompanying drawing explanation
Fig. 1 blue-green algae degradation speed comparison diagram that is various embodiments of the present invention when not adding catalyst.
Embodiment
Following enforcement illustration all carries out in the concrete sump that 2--5 ton water is housed, Chi Zhongshui is from the natural water area that contains blue-green algae, set up in addition one and the equal water yield is housed but does not add the identical waters of catalyst containing the pond of blue algae water, the use comparing, experimental data is shown in Fig. 1 in detail.
By particle diameter in 10 nanometers between 100 nanometers, average grain diameter is zinc oxide hex crystal (ZnO), the calcium oxide cubic crystal (CaO) of 20 nanometers, the mass percent of the two is that 99.5%:0.5% is simply mixed and made into catalyst.When carrying out blue-green algae catalytic oxidation, the impact of this catalyst on chemical reaction velocity, the speed of blue-green algae autoxidation degradation reaction improves 45% when not adding any catalyst.
By particle diameter in 10 nanometers between 100 nanometers, average grain diameter is that zinc oxide hex crystal (ZnO), the calcium oxide cubic crystal (CaO) of 16 nanometers mixes, the mass percent of the two is 95%:5%, through external force, mixture is ground again, makes partial oxidation zinc hex crystal (ZnO) and calcium oxide cubic crystal (CaO) in conjunction with forming complex. described complex refer to two kinds of crystal lattice under external force abrasive action occur distortion mutually cross-linked again together with and the new material ZnO-CaO that forms.Although newly-generated complex quantitative proportion is little, but improves more to the catalytic activity of whole system.When carrying out blue-green algae catalytic oxidation, its impact on chemical reaction velocity, the speed of blue-green algae autoxidation degradation reaction improves 78% when not adding any catalyst.
By particle diameter in 10 nanometers between 100 nanometers, average grain diameter is after zinc oxide hex crystal (ZnO), the calcium oxide cubic crystal (CaO) of 24 nanometers mixes, the mass percent of the two is 97%:3%, through external force, mixture is ground again, make partial oxidation zinc hex crystal (ZnO) and calcium oxide cubic crystal (CaO) combination form complex ZnO-CaO, make catalyst.When carrying out blue-green algae catalytic oxidation, its impact on chemical reaction velocity, the speed of blue-green algae autoxidation degradation reaction improves 60% when not adding any catalyst.
Claims (3)
1. a nano-photocatalyst for blue-green algae in killing water, is characterized in that, it comprises nano level zinc oxide hex crystal, calcium oxide cubic crystal, mass percent≤5% of described calcium oxide cubic crystal.
2. nano-photocatalyst according to claim 1, it is characterized in that, in described catalyst, also contain by between partial oxidation zinc hex crystal and the lattice of calcium oxide cubic crystal, under external force abrasive action, the distortion of appearance and complex ZnO-CaO mutual cross-linked and that form.
3. nano-photocatalyst according to claim 1 and 2, it is characterized in that, the particle diameter of the complex ZnO-CaO that described zinc oxide hex crystal, calcium oxide cubic crystal and zinc oxide hex crystal and calcium oxide cubic crystal form is between the two in 10 nanometers between 100 nanometers, and average grain diameter is the powder body material of 15 nanometer to 25 nanometers.
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| CN201310748578.0A CN103752302A (en) | 2013-12-31 | 2013-12-31 | Nanometer photo-catalyst for killing blue-green algae in water |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1772375A (en) * | 2005-10-27 | 2006-05-17 | 南京大学 | Nanometer doped zinc oxide and its prepn and application in photocatalysis to degrade organic matter and kill bacteria |
| CN1772353A (en) * | 2005-10-28 | 2006-05-17 | 南京大学 | Application of four-needle zinc oxide whisker in photocatalysis to degrading indoor organic pollutant |
| CN101491769A (en) * | 2009-03-16 | 2009-07-29 | 天津工业大学 | Strontium carbonate with visible photoresponse and preparation method thereof |
| JP2013154286A (en) * | 2012-01-30 | 2013-08-15 | Ohara Inc | Photocatalytic porous body |
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2013
- 2013-12-31 CN CN201310748578.0A patent/CN103752302A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1772375A (en) * | 2005-10-27 | 2006-05-17 | 南京大学 | Nanometer doped zinc oxide and its prepn and application in photocatalysis to degrade organic matter and kill bacteria |
| CN1772353A (en) * | 2005-10-28 | 2006-05-17 | 南京大学 | Application of four-needle zinc oxide whisker in photocatalysis to degrading indoor organic pollutant |
| CN101491769A (en) * | 2009-03-16 | 2009-07-29 | 天津工业大学 | Strontium carbonate with visible photoresponse and preparation method thereof |
| JP2013154286A (en) * | 2012-01-30 | 2013-08-15 | Ohara Inc | Photocatalytic porous body |
Non-Patent Citations (1)
| Title |
|---|
| 王岩玲 等: "球磨法制备异质结型光催化剂及催化性能", 《化学研究与应用》 * |
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Application publication date: 20140430 |