CN111559775A - Method for photocatalytic degradation of nitrate nitrogen in water body by using glucose - Google Patents
Method for photocatalytic degradation of nitrate nitrogen in water body by using glucose Download PDFInfo
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- CN111559775A CN111559775A CN202010409977.4A CN202010409977A CN111559775A CN 111559775 A CN111559775 A CN 111559775A CN 202010409977 A CN202010409977 A CN 202010409977A CN 111559775 A CN111559775 A CN 111559775A
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- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 title claims abstract description 45
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 title claims abstract description 28
- 239000008103 glucose Substances 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000013033 photocatalytic degradation reaction Methods 0.000 title claims abstract description 10
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 20
- 239000011941 photocatalyst Substances 0.000 claims abstract description 20
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000002351 wastewater Substances 0.000 claims abstract description 19
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052709 silver Inorganic materials 0.000 claims abstract description 6
- 239000004332 silver Substances 0.000 claims abstract description 6
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 6
- 230000001699 photocatalysis Effects 0.000 claims description 7
- 238000013032 photocatalytic reaction Methods 0.000 claims description 6
- 238000007146 photocatalysis Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 26
- 238000006731 degradation reaction Methods 0.000 abstract description 23
- 230000015556 catabolic process Effects 0.000 abstract description 18
- 239000007789 gas Substances 0.000 abstract description 8
- 239000010842 industrial wastewater Substances 0.000 abstract description 2
- 239000002352 surface water Substances 0.000 abstract description 2
- 239000003054 catalyst Substances 0.000 description 8
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 6
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 6
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 4
- 230000000593 degrading effect Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 4
- 229910052753 mercury Inorganic materials 0.000 description 4
- 239000005416 organic matter Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 3
- 235000010333 potassium nitrate Nutrition 0.000 description 3
- 239000004323 potassium nitrate Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000006479 redox reaction Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000010525 oxidative degradation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000001354 calcination Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Classifications
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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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/15—N03-N
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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
- C02F2305/02—Specific form of oxidant
-
- 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
-
- 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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- Hydrology & Water Resources (AREA)
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- Water Supply & Treatment (AREA)
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- Organic Chemistry (AREA)
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Abstract
The invention discloses a method for photocatalytic degradation of nitrate nitrogen in a water body by using glucose, which takes titanium dioxide loaded with silver as a photocatalyst and photocatalytically degrades nitrate wastewater containing glucose under ultraviolet light. The method utilizes glucose to remove nitrate in the wastewater, not only has high removal efficiency on the nitrate in the wastewater, the removal rate can reach more than 95 percent, the gas conversion rate is more than 70 percent, but also can effectively remove the glucose in the wastewater, the removal rate of the glucose is about 70 percent, the method has mild reaction conditions, the photocatalyst can be repeatedly utilized, and the method can be applied to the degradation of nitrate nitrogen in surface water and industrial wastewater which need to be rapidly treated.
Description
Technical Field
The invention relates to a method for photocatalytic degradation of nitrate nitrogen in a water body by using glucose, belonging to the technical field of water treatment.
Background
Nitrate nitrogen and organic matters are common pollutants in water, so that the nitrate nitrogen and the organic matters not only can cause harm to water environment, but also can cause certain influence on human bodies. The traditional biological treatment method has low treatment efficiency and long running period, and is not suitable for treating scenes such as initial rainwater and the like which need to be treated quickly.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for degrading nitrate nitrogen in a water body by utilizing glucose photocatalysis, which can simultaneously degrade glucose and nitrate nitrogen in the water body by utilizing a photocatalyst.
The technical scheme of the invention is as follows:
a method for photocatalytic degradation of nitrate nitrogen in water by using organic matters uses titanium dioxide loaded with silver as a photocatalyst to photocatalytic degrade nitrate wastewater containing glucose under ultraviolet light.
Wherein the initial concentration of glucose in the wastewater is 75-150 mg/L, and the initial concentration of nitrate nitrogen is 15 mg/L.
Wherein the adding amount of the photocatalyst is 0.25-1.5 g/L. Namely, 0.25 to 1.5g of photocatalyst is added into each liter of wastewater.
Wherein the loading amount of the silver on the titanium dioxide in the photocatalyst is 0.5-1.5 wt% of the mass of the photocatalyst.
Wherein the initial pH value of the photocatalytic reaction system is 4-9.
Has the advantages that: according to the method, the nitrate in the wastewater is removed by using the glucose, so that the removal efficiency of the nitrate in the wastewater is high, the removal rate can reach more than 95%, the gas conversion rate is more than 70%, the glucose in the wastewater can be effectively removed, the removal rate of the glucose is about 70%, the reaction condition is mild (the high degradation rate of nitrate nitrogen and the high gas conversion rate can be realized within the pH value range of 4-9), the photocatalyst can be recycled, and the method can be applied to the degradation of nitrate nitrogen in surface water and industrial wastewater which need to be rapidly treated.
Drawings
FIG. 1 is a graph of the reduction of nitrate nitrogen over time during co-degradation at different initial pH values and corresponding gas selectivity at the end of the reaction in example 1;
FIG. 2 is a graph of the oxidative degradation of CODcr as a function of pH during co-degradation of example 1 at various initial pH;
FIG. 3 is a graph showing the time-dependent changes in the concentrations of nitrate nitrogen, nitrite nitrogen, ammonia nitrogen and CODcr in the co-degradation process at pH 4.5 in example 1;
FIG. 4 is a graph of the reduction of nitrate nitrogen over time during co-degradation in example 2 at different photocatalyst dosages and corresponding gas selectivity at the end of the reaction;
FIG. 5 is a graph showing the variation of CODcr oxidative degradation with the amount of added catalyst during co-degradation in example 2 at different amounts of added photocatalyst and the corresponding gas selectivity at the end of the reaction.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings and examples.
Example 1
The invention relates to a method for degrading nitrate nitrogen in a water body by utilizing glucose photocatalysis, which specifically comprises the following steps:
step 2, injecting 250mL of nitrate wastewater into a photochemical reactor, wherein the initial concentration of nitrate nitrogen is 15mg/L, the initial concentration of COD is 100mg/L, nitrate nitrogen is simulated by potassium nitrate in the nitrate wastewater, and glucose is used as an organic matter; adding 0.25mg of photocatalyst into nitrate wastewater, and respectively adjusting different initial pH values in a plurality of parallel experiments so as to enable the initial pH values in a photocatalytic reaction system to be respectively 3.0, 3.5, 4.0, 4.5, 5.5, 7.0 and 9.0:
step 3, adopting a high-pressure mercury lamp with power of 125W as an ultraviolet light source, placing reaction solutions with different initial pH values into a photochemical reactor, turning on a light source and a condensed water switch, and carrying out oxidation-reduction reaction on the reaction solutions under ultraviolet irradiation for 120 minutes, wherein sampling is carried out once every 20 minutes;
and 4, measuring the contents of nitrate nitrogen, nitrite nitrogen, ammonia nitrogen and COD in each reaction solution in the reaction process, and obtaining the removal rate of nitrate nitrogen and the removal rate of COD in the reaction process through calculation.
As can be seen from FIG. 1, the initial pH value increased and the nitrate degradation rate tended to increase by comparison of multiple parallel experiments. When the pH value is more than or equal to 4.5, the nitrate nitrogen degradation rate is not obviously increased, namely the nitrate nitrogen degradation rate is stable, and the nitrate nitrogen degradation is nearly complete in about 60 min. When the initial pH was 4.5, the degradation rate was as high as 98.0%. The nitrate nitrogen with the initial pH value of 4-9 has good degradation effect, and the gas conversion rate is high (nitrate is converted into N)2The ratio (c) to 70% or more.
As can be seen from FIG. 2, the initial pH was 4 or more, and the CODcr degradation rate was close to 70% (η is the COD degradation rate). It can be seen from fig. 4 that as the nitrate nitrogen is degraded, it is partially converted into ammonia nitrogen, resulting in a gradual increase in the content of ammonia nitrogen in the solution. The content of nitrate nitrogen firstly rises and then falls, and finally disappears completely. The degradation speed of COD is changed to be consistent with that of nitrate nitrogen, the degradation speed is fast first and then slow, and finally the degradation speed tends to be stable.
Example 2
The invention relates to a method for degrading nitrate nitrogen in a water body by utilizing glucose photocatalysis, which specifically comprises the following steps:
step 2, injecting 250mL of nitrate wastewater into a photochemical reactor, wherein the initial concentration of nitrate nitrogen is 15mg/L, the initial concentration of COD is 100mg/L, the nitrate wastewater uses potassium nitrate to simulate nitrate nitrogen, and glucose is used as an organic matter; in a plurality of parallel experiments, different amounts of catalysts are respectively added, and the catalyst dosage in the photocatalytic reaction system is respectively 0.25mg/L, 0.50mg/L, 1.00mg/L and 1.50 mg/L; adjusting the initial pH value of the photocatalytic reaction system to be 4.5;
step 3, a high-pressure mercury lamp with power of 125W is used as an ultraviolet light source, reaction solutions with different photocatalyst adding amounts are placed in a photochemical reactor, a light source and a condensed water switch are turned on, so that the reaction solutions are subjected to oxidation-reduction reaction for 120 minutes under the irradiation of ultraviolet light, and sampling is carried out once every 20 minutes;
and 4, measuring the contents of nitrate nitrogen, nitrite nitrogen, ammonia nitrogen and COD in each reaction solution in the reaction process, and obtaining the removal rate of nitrate nitrogen and the removal rate of COD in the reaction process through calculation.
As can be seen from FIGS. 4 and 5, the final degradation rate of the photocatalyst for co-degrading nitrate nitrogen and organic pollutants is not greatly influenced by the amount of the catalyst, but the degradation rate is increased along with the increase of the amount of the catalyst, and when the addition amount of the catalyst reaches 1mg/L, the increase of the reaction rate is not obvious any more.
Example 3
The invention relates to a method for degrading nitrate nitrogen in a water body by utilizing glucose photocatalysis, which specifically comprises the following steps:
step 2, in a plurality of parallel experiments, the COD adding amount in 250mL of nitrate wastewater is 0mg/L, 25mg/L, 50mg/L, 75mg/L, 100mg/L and 150mg/L in sequence, the nitrate wastewater uses potassium nitrate to simulate nitrate nitrogen, and glucose is used as an organic matter; the initial concentration of nitrate nitrogen is 15mg/L, the adding amount of the photocatalyst is 0.25mg, and the initial pH of the photocatalytic reaction system is adjusted to be 4.5;
step 3, a high-pressure mercury lamp with power of 125W is used as an ultraviolet light source, reaction solutions with different COD adding amounts are placed in a photochemical reactor, a light source and a condensed water switch are turned on, so that the reaction solutions are subjected to oxidation-reduction reaction for 120 minutes under ultraviolet light irradiation, and sampling is carried out once every 20 minutes;
and 4, measuring the contents of nitrate nitrogen, nitrite nitrogen, ammonia nitrogen and CODcr in each reaction solution in the reaction process, and obtaining the removal rate of nitrate nitrogen and the removal rate of COD in the reaction process through calculation.
According to calculation, the removal rates of the nitrate under different COD adding amounts are respectively 0%, 64%, 76%, 87%, 95% and 99%, which shows that the adding amount of the organic matters influences the degradation rate of the nitrate, the gas conversion rates are respectively 0, 77%, 76%, 78%, 76% and 78%, and the degradation rates of the CODcr under different COD adding amounts are respectively 0, 54%, 59%, 66%, 70% and 61%. Organic substances generate CO under the action of photocatalyst2Free radicals, which are capable of efficiently reducing nitrate; meanwhile, the organic matter consumes the strong oxidizing substances in the photocatalytic system, so that the photo-generated electrons can react with nitrate radicals.
Claims (5)
1. A method for photocatalytic degradation of nitrate nitrogen in water by using glucose is characterized by comprising the following steps: titanium dioxide loaded with silver is used as a photocatalyst, and nitrate wastewater containing glucose is degraded under photocatalysis by ultraviolet light.
2. The method for photocatalytic degradation of nitrate nitrogen in water body by using glucose according to claim 1, is characterized in that: in the wastewater, the initial concentration of glucose is 75-125 mg/L, and the initial concentration of nitrate nitrogen is 15 mg/L.
3. The method for photocatalytic degradation of nitrate nitrogen in water body by using glucose according to claim 1, is characterized in that: the adding amount of the photocatalyst is 0.25-1.5 g/L.
4. The method for photocatalytic degradation of nitrate nitrogen in water body by using glucose according to claim 3, is characterized in that: the loading amount of the silver on the titanium dioxide in the photocatalyst is 0.5-1.5 wt% of the mass of the photocatalyst.
5. The method for photocatalytic degradation of nitrate nitrogen in water body by using glucose according to claim 1, is characterized in that: the initial pH value of the photocatalytic reaction system is 4-9.
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Cited By (4)
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| CN112830613A (en) * | 2021-03-08 | 2021-05-25 | 东南大学 | Water treatment method for removing nitrate nitrogen in water by activating citric acid through ultraviolet |
| CN115259500A (en) * | 2022-08-18 | 2022-11-01 | 中原环保股份有限公司 | Method for treating ammonium nitrate industrial wastewater |
| CN117619374A (en) * | 2023-11-30 | 2024-03-01 | 南京大学 | Metal doped SrTiO 3 /TiO 2 Photocatalytic material and preparation method and application thereof |
| CN117658317A (en) * | 2023-12-06 | 2024-03-08 | 杭州绿能环保发电有限公司 | Denitrifying carbon source with low sludge yield and garbage leachate treatment method using carbon source |
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| CN117619374A (en) * | 2023-11-30 | 2024-03-01 | 南京大学 | Metal doped SrTiO 3 /TiO 2 Photocatalytic material and preparation method and application thereof |
| CN117658317A (en) * | 2023-12-06 | 2024-03-08 | 杭州绿能环保发电有限公司 | Denitrifying carbon source with low sludge yield and garbage leachate treatment method using carbon source |
| CN117658317B (en) * | 2023-12-06 | 2024-06-04 | 杭州绿能环保发电有限公司 | Denitrifying carbon source with low sludge yield and garbage leachate treatment method using carbon source |
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