CN107265728B - Silver-nitrogen-doped porous ceramic water purifier and preparation method thereof - Google Patents
Silver-nitrogen-doped porous ceramic water purifier and preparation method thereof Download PDFInfo
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- CN107265728B CN107265728B CN201710480771.9A CN201710480771A CN107265728B CN 107265728 B CN107265728 B CN 107265728B CN 201710480771 A CN201710480771 A CN 201710480771A CN 107265728 B CN107265728 B CN 107265728B
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- 238000002360 preparation method Methods 0.000 title claims description 8
- 238000001914 filtration Methods 0.000 claims abstract description 58
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims abstract description 42
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Organic Chemistry (AREA)
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Abstract
The invention discloses a silver nitrogen doped porous ceramic water purifier, which comprises a primary filtering system and a secondary filtering system which are composed of porous ceramic, and a tertiary filtering system which is composed of natural medical stone; the secondary filtering system comprises an energy-saving lamp, a reflector and silver-nitrogen co-doped nano titanium dioxide loaded porous ceramic, wherein the surface of the porous ceramic of the secondary filtering system is coated with silver-nitrogen co-doped nano titanium dioxide, and the bottom surface of the porous ceramic of the secondary filtering system is coated with nano silver; a telescopic baffle and a water faucet are arranged between the primary filtering system and the secondary filtering system; and a drinking water heating device is arranged below the three-stage filtering system so as to provide hot water. The water purifier adopts tertiary filtration processing system, improves play water quality of water greatly, and the centre is equipped with scalable baffle, can realize the multi-functional use of water purifier, further satisfies user's demand.
Description
Technical Field
The invention belongs to the technical field of drinking water treatment, and relates to a silver-nitrogen doped porous ceramic water purifier, in particular to a porous ceramic water purifier consisting of clay, rice hulls, silver-nitrogen co-doped nano titanium dioxide and nano silver and a preparation method thereof.
Background
At present, more than 17 hundred million people worldwide can not drink safe and sanitary drinking water, and in most developing countries, the traditional safe and sanitary pipeline water delivery mode is popularized for at least several decades, which means that people in some poor areas have to collect river water, lake water or precipitation outdoors by taking families as units, and carry out self-treatment and storage to maintain daily domestic water. In China, rural population accounts for most of the general population, and the drinking water safety problem in rural areas is more serious than that in cities, especially in the middle and western areas and poor areas. Therefore, the household water treatment device, namely the nano-particle loaded porous ceramic water purifier, which has low price and simple operation, is suitable for transportation, and the water purifier has simple operation and is convenient to popularize in poor rural areas.
The nanometer titanium dioxide has the advantages of low price, easily obtained raw materials, good chemical stability and the like, has wide application prospects in the aspects of energy conversion, air and water purification and the like, but has a plurality of defects in the aspect of practical application. The utilization rate of sunlight is not high, the sunlight mainly depends on ultraviolet light, and the quantum efficiency is not high. Therefore, the development of the nano titanium dioxide with higher catalytic activity and stability by modifying the nano titanium dioxide by a proper method is always a difficult problem for many researchers.
At present, most of modification experiments aiming at the nano titanium dioxide are carried out by metal ion doping, noble metal doping and nonmetal doping, the methods enable the light absorption band of the nano titanium dioxide to generate red shift to a certain extent, but cannot completely get rid of the limitation of ultraviolet light.
The prior art, Chinese patent document No. CN10169631B, describes a preparation method of porous ceramsite, which has a bactericidal effect in water purification and filtration to a certain extent, but the method has the disadvantages of complex pretreatment of granular substances, small pore-forming agent particle size and low porosity, which causes slow filtration speed, and as a ceramic granular water body repairing agent, a lot of metals are added in the manufacturing process, and secondary pollution is easily caused by improper use in the treatment process. The document No. CN101041134B adopts silver-nitrogen co-doped nano titanium dioxide to load on bamboo charcoal, on one hand, the specific surface area of the bamboo charcoal is large, and the bamboo charcoal has a good adsorption effect on harmful substances, and on the other hand, the silver-nitrogen co-doping modifies the nano titanium dioxide to enable the light absorption band to red shift, and complete sterilization under the condition without light sources cannot be realized, so that the sterilization effect in the patent is unstable, the removal rate of escherichia coli is 90%, and the requirement on the escherichia coli in the drinking water standard cannot be met.
Disclosure of Invention
The invention aims to solve the following problems:
in rural areas in China, particularly in rural areas in the northwest, the precipitation is less, the economic condition is backward, tap water pipelines are not used in many areas, only well water, river underground water and shallow surface water can be used, the quantities of fluorine, arsenic, BOD, COD and bacteria and viruses in water source water are seriously exceeded due to environmental pollution, and particularly, the content of Escherichia coli in the water source water is seriously exceeded, so that diarrhea and dysentery are caused at a low rate, and the life is threatened at a high rate.
The existing water drinkers on the market are very expensive, some water drinkers need to be maintained and replaced regularly, depend on electric power, are complex to operate, have certain treatment effect, but have large power consumption, high maintenance cost and high price, and are not suitable for the basic situation of rural areas in the aspect of use.
Aiming at the defects of the prior art, the invention uses local materials according to local conditions and aims to develop a household porous ceramic water purifier which has the advantages of low price, environmental protection, green, broad-spectrum antibiosis, good removal effect on pollutants in water and suitability for the existing conditions in rural areas.
In order to solve the problems, the invention provides a silver nitrogen doped porous ceramic water purifier which can fully utilize solar energy, can use local materials, is low in cost, easy to operate and simple in process. The secondary filtering system is composed of an energy-saving lamp, a reflector and porous pottery loaded with silver-nitrogen co-doped nano titanium dioxide, the surface of the porous pottery of the secondary filtering system is sprayed with the silver-nitrogen co-doped nano titanium dioxide, and the bottom surface of the porous pottery of the secondary filtering system is coated with nano silver. The water purifier is characterized in that the primary filtering system and the secondary filtering system are provided with a telescopic baffle and a faucet between each two for realizing the multifunctional use of the water purifier. And the wall and the top of the porous ceramic water purifier are provided with solar power generation plates so as to supply power to the energy-saving lamp. And a drinking water heating device is arranged below the three-stage filtering system so as to provide hot water.
The manufacturing steps of the porous ceramic of the primary filtering system comprise the following steps:
the method comprises the following steps: grinding natural rice hulls and argil in a ball mill, sieving the rice hulls with a 40-mesh sieve, sieving the clay with a 80-mesh sieve, and mixing the raw materials in a ratio of rice hulls: mixing and stirring the clay with the weight ratio of 1:2.5, wherein water is used as a binder to be mixed into clay blocks;
step two: putting the mixed clay blocks into a die for compression molding, treating the surface to make the surface smooth, marking, and then airing for 5-10 days at room temperature according to weather conditions; and
step three: and (3) putting the completely dried ceramic fitting into a muffle furnace for firing, wherein the heating rate is 2 ℃/min, the firing time is 500 minutes to the highest temperature of 1000-fold glass-ceramic 1100 ℃, naturally cooling in the furnace to obtain the required ceramic device, and the rice hulls are fully combusted along with the rise of the firing temperature to form air holes in the ceramic device and on the surface of the ceramic device, so that suspended matters and microorganisms in the raw water are intercepted.
The invention is mainly characterized in that the porous ceramic manufacturing step of the secondary filtering system comprises the following steps:
the method comprises the following steps: grinding natural rice hulls and argil in a ball mill, sieving the rice hulls with a 80-mesh sieve, sieving the clay with a 80-mesh sieve, and mixing the rice hulls: mixing and stirring the clay with the weight ratio of 1:2.7, wherein water is used as a binder to be mixed into clay blocks;
step two: placing the mixed clay blocks into a mold for compression molding, treating the surface to make the surface smooth, marking, and airing at room temperature for 5-10 days according to weather conditions;
step three: placing the completely dried ceramic fittings into a muffle furnace for firing, wherein the heating rate is 2 ℃/min, the firing time is 500 minutes to the highest temperature of 1000-1100 ℃, the heat preservation time is set at the highest temperature for 1.5 hours, and the furnace is naturally cooled to obtain the required porous ceramic fittings;
step four: taking silver-nitrogen co-doped nano titanium dioxide powder, adding an anatase type nano titanium dioxide dispersing agent and water, preparing a nano titanium dioxide solution with the mass fraction of 2.5%, stirring in a magnetic stirrer for 1 hour, and then performing ultrasonic treatment in an ultrasonic machine for 1 hour to ensure the full dispersion of the nano titanium dioxide;
step five: spraying the silver-nitrogen co-doped nano titanium dioxide on the surface of the porous ceramic fitting for 20 seconds by using a spray gun, wherein the spraying distance is 0.45 m, and drying at normal temperature; and
step six: and (3) turning the porous pottery to the bottom surface, brushing 4 layers of nano silver with a brush, and drying at normal temperature to obtain the required porous pottery accessory.
The preparation method of the silver-nitrogen co-doped nano titanium dioxide powder comprises the following steps:
step a: mixing and stirring commercially available P25 nano titanium dioxide and treated urea according to the molar ratio of 2:1, putting the mixture into a muffle furnace for calcining at the heating rate of 1.5 ℃/min for 250 minutes until the highest temperature is 350-; and
step b: and (2) putting a silver nitrate solution into ammonia water, dispersing the prepared nitrogen-doped nano titanium dioxide powder into the ammonia water, stirring the mixture for 1 hour by using a magnetic stirrer, reacting the mixture for 3 hours in a hydrothermal reaction kettle at the temperature of 200 ℃, cooling the mixture at room temperature, washing the cooled mixture with clear water, and drying the cooled mixture in an oven to obtain the silver-nitrogen co-doped nano titanium dioxide powder.
Compared with the prior art, the invention has the advantages that:
1. the solar cell panels are arranged on the top and the outer wall of the water purifier, the heat insulation layer is arranged beside each solar cell panel, solar energy is converted into electric energy, the electric energy is provided for the energy-saving lamp in the secondary filtration treatment system and the heating device at the bottom, and the completely self-sufficient environment-friendly purpose of the water purifier is achieved.
2. Adopt tertiary filtration processing system, improve water quality of water greatly, the centre is equipped with scalable baffle, can realize the multi-functional use of water purifier, further satisfies user's demand. The ceramic device has good chemical stability, does not generate secondary pollution due to chemical reaction with other substances, has high porosity and high strength, can not deform under the impact pressure of water, adopts natural raw materials which are nontoxic and odorless, has no foreign matter falling off, can not generate secondary pollution, and has longer service life.
3. In the secondary filtering system, silver and nitrogen co-doped nano titanium dioxide is loaded on the surface of the porous pottery, an energy-saving lamp is arranged above the porous pottery to carry out photocatalytic sterilization on inlet water, nano silver is loaded on the bottom surface of the porous pottery, bacteria and viruses in water can be effectively killed, the quality of outlet water is ensured, the sterilization rate can reach 100%, and the quantity of the bacteria and the viruses in the outlet water meet the drinking water standard.
Drawings
Fig. 1 is a front view of a porous ceramic water purifier.
Fig. 2 is a front view of the porous ceramic water purifier after opening the retractable baffle and performing only one-stage filtration treatment.
Fig. 3 is a plan view of the porous ceramic water purifier.
In the figure, 1-thermal insulation layer, 2-solar power generation board, 3-first-stage porous ceramic filtering system, 4-energy-saving lamp, 5-reflector, 6-water outlet tap, 7-button, 8-telescopic baffle, 9-second-stage filtering system-silver nitrogen co-doped nano titanium dioxide loaded porous ceramic, 10-solar power generation board, 11-thermal insulation layer, 12-third-stage filtering system-natural medical stone, 13-button, 14-water outlet tap and 15-heating device
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Raw water enters a primary porous pottery filtering system 3, and the grain size of rice hulls used for manufacturing the primary porous pottery is 40 meshes and is about 0.425mm, and the grain size of the rice hulls is as follows: the mass ratio of the clay is 2.5:1, the porosity is high, the filtering rate is higher than that of a secondary filtering system, suspended matters, organic matters and most of bacteria in raw water can be blocked, as shown in figure 2, a button 7 is pressed, a telescopic baffle 8 is used for blocking water from continuously filtering downwards, and a water faucet 6 is opened for use. If drinking water is used, as shown in fig. 1, water filtered from the primary filtering system 3 enters the secondary filtering system 9, the grain size of rice husks of porous pottery in the secondary filtering system is 80 meshes and is about 0.180mm, and the grain size of the rice husks: the mass ratio of the clay is 1:2.7, the clay has a filtering effect on smaller bacteria and particles, and the silver-nitrogen co-doped nano titanium dioxide loaded porous pottery in the secondary filtering system has a removing effect on bacteria, viruses and heavy metals in raw water flowing through the surface of the clay under the illumination of a 4-energy-saving lamp 5 reflector. When raw water flows through the porous pottery, the nano-silver on the bottom surface of the pottery further kills bacteria and viruses in the water, and the water is ensured to be sterile and nontoxic. The manufacturing steps of the secondary filtering system comprise the following steps:
the method comprises the following steps: grinding natural rice hulls and argil in a ball mill, sieving the rice hulls with a 80-mesh sieve, sieving the clay with a 80-mesh sieve, and mixing the rice hulls: mixing and stirring the clay with the weight ratio of 1:2.7, wherein water is used as a binder to be mixed into clay blocks;
step two: placing the mixed clay blocks into a mold for compression molding, treating the surface to make the surface smooth, marking, and airing at room temperature for 5-10 days according to weather conditions;
step three: placing the completely dried ceramic fittings into a muffle furnace for firing, wherein the heating rate is 2 ℃/min, the firing time is 500 minutes to the highest temperature of 1000-1100 ℃, the heat preservation time is set at the highest temperature for 1.5 hours, and the furnace is naturally cooled to obtain the required porous ceramic fittings;
step four: taking silver-nitrogen co-doped nano titanium dioxide powder, adding an anatase type nano titanium dioxide dispersing agent and water, preparing a nano titanium dioxide solution with the mass fraction of 2.5%, stirring in a magnetic stirrer for 1 hour, and then performing ultrasonic treatment in an ultrasonic machine for 1 hour to ensure the full dispersion of the nano titanium dioxide;
step five: spraying the silver-nitrogen co-doped nano titanium dioxide on the surface of the porous ceramic fitting for 20 seconds by using a spray gun, wherein the spraying distance is 0.45 m, and drying at normal temperature; and
step six: and (3) turning the porous pottery to the bottom surface, brushing 4 layers of nano silver with a brush, and drying at normal temperature to obtain the required porous pottery accessory.
The manufacturing steps of the primary filtering system comprise the following steps:
the method comprises the following steps: grinding natural rice hulls and argil in a ball mill, sieving the rice hulls with a 40-mesh sieve, sieving the clay with a 80-mesh sieve, and mixing the raw materials in a ratio of rice hulls: mixing and stirring the clay with the weight ratio of 1:2.5, wherein water is used as a binder to be mixed into clay blocks;
step two: putting the mixed clay blocks into a die for compression molding, treating the surface to make the surface smooth, marking, and then airing for 5-10 days at room temperature according to weather conditions; and
step three: and (3) putting the completely dried ceramic fitting into a muffle furnace for firing, wherein the heating rate is 2 ℃/min, the firing time is 500 minutes to the highest temperature of 1000-fold glass-ceramic 1100 ℃, naturally cooling in the furnace to obtain the required ceramic device, and the rice hulls are fully combusted along with the rise of the firing temperature to form air holes in the ceramic device and on the surface of the ceramic device, so that suspended matters and microorganisms in the raw water are intercepted.
The preparation method of the silver-nitrogen co-doped nano titanium dioxide powder comprises the following steps:
step a: mixing and stirring commercially available P25 nano titanium dioxide and treated urea according to the molar ratio of 2:1, putting the mixture into a muffle furnace for calcining at the heating rate of 1.5 ℃/min for 250 minutes until the highest temperature is 350-; and
step b: and (2) putting a silver nitrate solution into ammonia water, dispersing the prepared nitrogen-doped nano titanium dioxide powder into the ammonia water, stirring the mixture for 1 hour by using a magnetic stirrer, reacting the mixture for 3 hours in a hydrothermal reaction kettle at the temperature of 200 ℃, cooling the mixture at room temperature, washing the cooled mixture with clear water, and drying the cooled mixture in an oven to obtain the silver-nitrogen co-doped nano titanium dioxide powder.
Then, the water enters the three-stage filtering system 12, wherein the natural medical stone can adsorb organic matters and harmful substances in the water, increase mineral substances and trace elements in the water, and improve the water quality and the taste of the drinking water. The bottom of the water purifier is provided with a heating device 15, the button 13 is pressed to heat the discharged water, and the tap 14 is opened to drink. The top and the periphery of the water purifier are provided with the solar power generation panels 2 and 10, and the external surfaces of the solar power generation panels are provided with the heat insulation layers 1 and 11, so that the self-sufficiency of the device is realized, the environment is protected, the environment is green, and no secondary pollution is caused. As shown in the third figure, the invention is in a cuboid shape, wherein the primary filtering system is a hollow quadrangular frustum with a bottom; the secondary filtering system consists of a cuboid porous ceramic loaded with nano particles, wherein two sides of the cuboid porous ceramic are fixed by gaskets, an energy-saving lamp is arranged above the cuboid porous ceramic, and reflectors are arranged around the cuboid porous ceramic; the three-stage filtering system is composed of a cuboid made of natural medical stones, and gaskets are arranged on two sides for fixing.
Example (b): river water purification experiment
Experiment operation, a certain amount of river water is taken to be put into the water purifier, the inflow water quality of the river water is TOC 4.5 mg/L: 4 mg/L, total fecal coliform flora is 341828/L, the button 7 is pressed, water is respectively connected to the water tap 6 and the water tap 14, and the indexes of the water are detected.
Experiments show that: the water outlet of the tap 6 after the treatment of the invention meets the water quality standard of tap water, and the water outlet of the tap 14 meets the water quality standard of drinking water. Therefore, the invention has obvious effect in the drinking water treatment process, is environment-friendly and green, has no secondary pollution, has longer service life and wide market prospect.
The above embodiments describe the technical solutions of the present invention in detail. It will be clear that the invention is not limited to the described embodiments. Based on the embodiments of the present invention, those skilled in the art can make various changes, but any changes equivalent or similar to the present invention are within the protection scope of the present invention.
Claims (4)
1. The preparation method of the silver nitrogen doped porous ceramic water purifier is characterized in that the water purifier comprises a primary filtering system and a secondary filtering system which are composed of porous ceramic, and a tertiary filtering system which is composed of natural medical stone; the secondary filtering system comprises an energy-saving lamp, a reflector and silver-nitrogen co-doped nano titanium dioxide loaded porous ceramic, wherein the surface of the porous ceramic of the secondary filtering system is coated with silver-nitrogen co-doped nano titanium dioxide, and the bottom surface of the porous ceramic of the secondary filtering system is coated with nano silver; a telescopic baffle and a water faucet are arranged between the primary filtering system and the secondary filtering system; a drinking water heating device is arranged below the three-stage filtering system so as to provide hot water;
the preparation method comprises the following steps of assembling a primary filtering system and a secondary filtering system which are composed of porous pottery and a tertiary filtering system which is composed of natural medical stones, wherein the porous pottery of the primary filtering system is prepared by the following steps:
the method comprises the following steps: grinding natural rice hulls and argil in a ball mill, sieving the rice hulls with a 40-mesh sieve, sieving the argil with a 80-mesh sieve, and mixing the rice hulls: clay is prepared into clay blocks by taking water as a binder according to the weight ratio of 1: 2.5;
step two: pressing the clay blocks in a mould to form ceramic fittings, and airing for 5-10 days at room temperature;
step three: firing the dried ceramic fitting at the heating speed of 2 ℃/min for 500 minutes at the firing temperature of 1000-;
the porous ceramic of the secondary filtering system is prepared by the following steps:
the method comprises the following steps: grinding natural rice hulls and argil in a ball mill, sieving the rice hulls with a 80-mesh sieve, sieving the argil with a 80-mesh sieve, and grinding the rice hulls: mixing clay with water as binder at a weight ratio of 1:2.7 to obtain clay block;
step two: pressing the clay blocks in a mould to form ceramic fittings, and airing for 5-10 days at room temperature;
step three: firing the dried ceramic part at the heating rate of 2 ℃/min for 500 minutes and the firing temperature of 1000-;
step four: adding silver-nitrogen co-doped nano titanium dioxide powder into an anatase type nano titanium dioxide dispersing agent and water to prepare a nano titanium dioxide solution with the mass fraction of 2.5%, stirring and ultrasonically dispersing;
step five: spraying the obtained nano titanium dioxide solution on the surface of the porous ceramic accessory, and drying at normal temperature;
step six: coating nano silver on the bottom surface of the porous ceramic fitting, and drying at normal temperature;
the silver-nitrogen co-doped nano titanium dioxide powder is prepared by the following steps:
step a: mixing, stirring and calcining the nano titanium dioxide and urea according to the molar ratio of 2:1, wherein the heating speed is 1.5 ℃/min, the firing time is 250 minutes, the firing temperature is 350-;
step b: and (3) dispersing the prepared nitrogen-doped nano titanium dioxide powder in a silver nitrate solution in ammonia water, reacting for 3 hours in a hydrothermal reaction kettle at 200 ℃, cooling, washing with water and drying to obtain the silver-nitrogen co-doped nano titanium dioxide powder.
2. The method as claimed in claim 1, wherein the porous ceramic water purifier is provided with solar power generation panels on the wall and the top thereof to supply power to the energy saving lamp.
3. The method as claimed in claim 1, wherein the porous ceramic of the primary filtration system has a hollow bottomed quadrangular frustum shape, and raw water flows out from the bottom and side surfaces of the quadrangular frustum.
4. The method as claimed in claim 1, wherein the spraying time of the titanium dioxide solution in porous ceramic making of the secondary filtration system is 20 seconds and the spraying distance is 0.45 meters.
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| CN108404466B (en) * | 2018-04-03 | 2020-07-03 | 北京师范大学 | Nested ceramic filter and filtering method |
| CN112129906B (en) * | 2020-09-24 | 2022-12-27 | 新疆河润水业有限责任公司 | Intelligent water quality remote monitoring device |
| CN112357984B (en) * | 2020-10-26 | 2023-09-01 | 杭州电子科技大学 | Silver-doped clay particles, preparation method thereof and biological sand filtering system |
| CN117923727A (en) * | 2024-03-11 | 2024-04-26 | 中国标准化研究院 | Porous Tao Guyong water purifier for targeted removal of micro pollutants and manufacturing method thereof |
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