CN109574127B - Method for treating ammonia nitrogen pollutants in water by sulfide photoanode activated sulfite - Google Patents
Method for treating ammonia nitrogen pollutants in water by sulfide photoanode activated sulfite Download PDFInfo
- Publication number
- CN109574127B CN109574127B CN201811397274.3A CN201811397274A CN109574127B CN 109574127 B CN109574127 B CN 109574127B CN 201811397274 A CN201811397274 A CN 201811397274A CN 109574127 B CN109574127 B CN 109574127B
- Authority
- CN
- China
- Prior art keywords
- ammonia nitrogen
- water
- photoanode
- sulfite
- molybdenum disulfide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 title claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 57
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 21
- 231100000719 pollutant Toxicity 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 20
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 title claims abstract description 15
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims abstract description 41
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 11
- 239000010439 graphite Substances 0.000 claims abstract description 11
- 239000002351 wastewater Substances 0.000 claims abstract description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 20
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000002135 nanosheet Substances 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 8
- 239000011521 glass Substances 0.000 claims description 7
- 239000002202 Polyethylene glycol Substances 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 5
- 238000004528 spin coating Methods 0.000 claims description 5
- 239000004408 titanium dioxide Substances 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000000137 annealing Methods 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 239000012300 argon atmosphere Substances 0.000 claims description 2
- 238000001354 calcination Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 239000004570 mortar (masonry) Substances 0.000 claims description 2
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000007790 scraping Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 239000006228 supernatant Substances 0.000 claims description 2
- 230000004913 activation Effects 0.000 claims 7
- 238000006243 chemical reaction Methods 0.000 abstract description 15
- 230000003213 activating effect Effects 0.000 abstract description 4
- -1 oxygen-sulfur free radical Chemical class 0.000 abstract description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 18
- 230000015556 catabolic process Effects 0.000 description 15
- 238000006731 degradation reaction Methods 0.000 description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 13
- 239000001301 oxygen Substances 0.000 description 13
- 229910052760 oxygen Inorganic materials 0.000 description 13
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 12
- 238000006552 photochemical reaction Methods 0.000 description 10
- 235000010265 sodium sulphite Nutrition 0.000 description 9
- 229910052724 xenon Inorganic materials 0.000 description 9
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 229910021529 ammonia Inorganic materials 0.000 description 6
- 230000001678 irradiating effect Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 230000000593 degrading effect Effects 0.000 description 3
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 3
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000007857 degradation product Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000007888 film coating Substances 0.000 description 2
- 238000009501 film coating Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000001699 photocatalysis Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 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 description 1
- XOCUXOWLYLLJLV-UHFFFAOYSA-N [O].[S] Chemical compound [O].[S] XOCUXOWLYLLJLV-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009303 advanced oxidation process reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910003437 indium oxide Inorganic materials 0.000 description 1
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 239000011941 photocatalyst Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000003403 water pollutant Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
Landscapes
- Chemical & Material Sciences (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physical Water Treatments (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses a method for treating ammonia nitrogen pollutants in water by sulfide photoanode activated sulfite, which comprises the following steps: under the irradiation of visible light, ultraviolet light or sunlight, air is introduced into the ammonia nitrogen wastewater in the photoelectrochemical cell, and meanwhile, a molybdenum disulfide electrode is used as a photoanode, and a graphite electrode is used as a cathode to apply voltage. The invention utilizes the oxygen-sulfur free radical generated by activating sulfite through photoelectrocatalysis to efficiently degrade ammonia nitrogen, the cost is greatly reduced by lower external bias and irradiation of visible light, and the product is mainly nitrogen, thereby avoiding the mutual conversion between nitrogen-containing compounds with different valence states and being more beneficial to completely removing ammonia nitrogen pollutants.
Description
Technical Field
The invention relates to a method for treating ammonia nitrogen pollutants in water, in particular to a method for treating ammonia nitrogen pollutants in water by sulfide photoanode activated sulfite.
Background
Ammonia nitrogen is a common pollutant in water and also is a main source for generating unpleasant odor when polluting water. High-concentration ammonia nitrogen can cause water eutrophication and can cause more health risks to aquatic organisms, thereby constituting a great threat to the environment and human health. Currently, traditional technologies such as biological treatment, membrane separation, ion exchange, chemical oxidation, physical adsorption and breakpoint chlorination are mainly used for degrading ammonia nitrogen. However, the technologies have certain defects in the aspects of treatment cost, secondary pollution control and the like, and an effective, low-cost and environment-friendly method for removing ammonia nitrogen from wastewater is not found so far.
In order to make up for the shortcomings of the conventional water treatment technology, photocatalytic and Photoelectrocatalytic (PEC) degradation of water pollutants, one of the potential advanced oxidation technologies (AOPS) that can be used for environmental remediation, has been extensively studied in recent years, and a method for removing ammonia nitrogen by photocatalysis has also been attempted. In these works, hydroxyl radicals and valence band holes generated by irradiation of the semiconductor photocatalyst with light radiation are the main oxidants. However, advanced oxidation processes based on hydroxyl radicals have been found to be unsuitable for removing ammonia species. From the structural point of view, the hydroxyl radical having a strong electrophilicity has a similar electronic structure to the ammonia molecule and the water molecule, and thus ammonia in water is not easily selectively attacked by the hydroxyl radical. On the other hand, the external electron of the oxygen atom in the hydroxyl radical does not have a suitable steric orbital to bind to the nitrogen atom to extract an electron from ammonia. Furthermore, complete removal of ammonia species from water cannot be achieved using hydroxyl radicals, since most of the ammonia nitrogen is oxidized by the hydroxyl radicals to nitrite and nitrate ions, rather than to the more desirable product, nitrogen.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for treating ammonia nitrogen pollutants in water by using sulfide photoanode to activate sulfite, wherein most ammonia nitrogen is converted into nitrogen by using active components generated by activating sulfite by using the sulfide photoanode under the irradiation of visible light, ultraviolet light or sunlight, so that efficient and thorough denitrification in water is realized, and the method has the characteristics of low cost and environmental friendliness for visible light utilization.
The technical scheme adopted by the invention is as follows:
a method for treating ammonia nitrogen pollutants in water by sulfide photoanode activated sulfite is characterized by comprising the following steps: under the irradiation of visible light, ultraviolet light or sunlight, air is introduced into the ammonia nitrogen wastewater in the photoelectrochemical cell, and meanwhile, a molybdenum disulfide or tungsten disulfide electrode is used as a photoanode, and a graphite electrode is used as a cathode to apply external voltage.
Preferably, the intensity of the visible light, the ultraviolet light or the sunlight is 0.01W/cm2～10W/cm2。
Preferably, the photoelectrochemical cell is a cell with a light receiving surface made of quartz glass.
Preferably, the concentration of the sulfite in the wastewater is 0.01-3 mol/L.
Preferably, the applied voltage is 0.1V-100V.
Preferably, the speed of introducing the air is 0.1L/min-100L/min.
Preferably, the reaction time for treating the ammonia nitrogen pollutants in the water is 1-10 h.
The preparation method of the molybdenum disulfide electrode used by the invention comprises the following steps:
s1, placing raw material molybdenum disulfide powder into a beaker filled with an ethanol/water mixed solution (the volume ratio of ethanol is 45%), processing the raw material molybdenum disulfide powder for 1-10 h by using an ultrasonic processor, controlling the temperature to be 0-60 ℃, so that the raw material molybdenum disulfide powder is stripped into molybdenum disulfide nanosheets, centrifuging the molybdenum disulfide nanosheets, and taking supernatant to obtain dispersion liquid of the molybdenum disulfide nanosheets;
s2, adding polyethylene glycol into a beaker filled with water, magnetically stirring the mixture evenly, adding nano titanium dioxide powder into the obtained solution, grinding the mixture in a mortar to form slurry, coating the slurry on the surface of conductive glass in a scraping way, drying the conductive glass at room temperature, and calcining the conductive glass in a muffle furnace at 300-600 ℃ for 1-5 hours to obtain a titanium dioxide substrate electrode;
s3, spin-coating the dispersion liquid of the molybdenum disulfide nanosheet on the surface of the titanium dioxide substrate electrode at the temperature of 30-90 ℃ by using a spin coating machine, and annealing the electrode for 1-5 hours at the temperature of 200-500 ℃ in a nitrogen or argon atmosphere to obtain the low-dimensional molybdenum disulfide photoanode.
In the invention, the volume fraction of ethanol in the ethanol/water mixed solution is 20-80%.
In the invention, the ultrasonic power of the ultrasonic processor is 200W-1000W.
In the invention, the centrifugal speed is 2000 rpm-5000 rpm.
In the invention, the concentration of the polyethylene glycol dissolved by adding water is 0.1 g/ml-2 g/ml.
In the invention, the concentration of the nano titanium dioxide in the polyethylene glycol aqueous solution is 0.1 g/ml-1 g/ml.
In the invention, the rotating speed of the rotary film coating machine is 100 rpm-1000 rpm.
The low-dimensional molybdenum disulfide photoanode can be used for degrading pollutants in water under the irradiation of visible light, ultraviolet light or solar light and certain external bias voltage.
The principle of the invention is as follows: in the photoelectrochemical pool, a molybdenum disulfide electrode is arranged as a photoanode, under the irradiation of visible light or ultraviolet light or sunlight and a certain external bias condition, oxygen and sulfur free radicals generated by activating sulfite by utilizing an electron/hole pair generated by photoelectrocatalysis act on ammonia nitrogen in water, and meanwhile, air is continuously slowly introduced into the reaction pool to increase the dissolved oxygen level in water, so that the conversion of the oxygen and sulfur free radicals is further promoted, and most of the ammonia nitrogen is converted into nitrogen.
The prepared molybdenum disulfide electrode is utilized to carry out ammonia nitrogen degradation test in a photochemical reaction tank under the conditions of irradiation of visible light, ultraviolet light or sunlight, external bias and slow air introduction. The activity of photoelectrocatalysis activated sulfite denitrification is proved by experiments. The degradation rate of ammonia nitrogen reaches 77% after the reaction is carried out for 6 hours by the mixed solution of 0.1M sulfite and 10mg/L ammonia nitrogen, 75% of degraded ammonia nitrogen is converted into nitrogen, and the formation of oxidized nitrogen by over oxidation is avoided, so that the method belongs to a mild oxidation and high-efficiency environment-friendly denitrification technology. In addition, tests prove that the degradation effect of ammonia nitrogen is optimal under alkaline conditions.
The invention has the advantages that: the oxygen-sulfur free radicals generated by activating sulfite through photoelectrocatalysis are used for efficiently degrading ammonia nitrogen, the cost is greatly reduced by lower external bias voltage and irradiation of visible light, and the product is mainly nitrogen, so that the mutual conversion among nitrogen-containing compounds with different valence states is avoided, and the degradation of wastewater is facilitated.
The invention is very suitable for the degradation of wastewater containing sulfite and ammonia nitrogen, such as the wastewater generated in the ammonia absorption and desulfurization process of combustion flue gas.
Drawings
FIG. 1 is an atomic force microscope representation of a low dimensional material;
FIG. 2 is an X-ray diffraction pattern of a molybdenum disulfide electrode;
FIG. 3 is a photocurrent detection graph of a molybdenum disulfide electrode under continuous light conditions;
FIG. 4 is a graph showing the change in ammonia nitrogen concentration.
FIG. 5 is an analysis chart of ammonia nitrogen degradation products.
Detailed Description
The preparation method of the molybdenum disulfide electrode used in the following examples is as follows: ultrasonically stripping molybdenum disulfide powder in an ethanol/water mixed solution (the volume ratio of ethanol is 45%) to obtain a low-dimensional material, and spin-coating the solution on conductive glass (ITO) through a film coating machine to prepare the low-dimensional material; the photoelectrochemical cell is a cell with a light receiving surface made of quartz glass. The atomic force microscope characterization diagram of the low-dimensional material obtained after ultrasonic stripping is shown in fig. 1, and the result shows that the thickness of the molybdenum disulfide nanosheet is 5-10 nm mostly and the molybdenum disulfide nanosheet is of a few-layer structure. The X-ray diffraction pattern of the prepared molybdenum disulfide electrode is shown in figure 2, and each peak in the pattern corresponds to the diffraction peak of molybdenum disulfide, titanium dioxide and indium oxide in ITO respectively, which indicates that no other impurities are doped in the prepared electrode. A photocurrent detection graph of the prepared molybdenum disulfide electrode under continuous illumination for 1h under 0.6 external bias is shown in figure 3, and the current of the molybdenum disulfide electrode continuously rises by about 965 muA after continuous illumination for 1h, which indicates that the electrode has excellent photoelectric properties.
Example 1
The concentration of ammonia nitrogen in 100ml water is 10mg/L, the concentration of sodium sulfite is 0.1M (pH is 9-10), bias voltage is 0.6V, air is slowly introduced to increase dissolved oxygen in water, and xenon lamp light source (420-800 nm, light intensity is 0.4W/cm)2) Irradiating with 1cm of light2The molybdenum disulfide electrode is used as a photo-anode, the graphite electrode is used as a cathode, and the ammonia nitrogen removal rate can reach 77 percent after 6 hours of reaction in the photochemical reaction tank.
If the electrochemical reaction is carried out under the bias voltage of 0.6V only without using light source for irradiation, under the same condition, the ammonia nitrogen removal rate after 6 hours of reaction is only 27 percent. The corresponding ammonia nitrogen concentration change chart is shown in figure 4. The analysis chart of the ammonia nitrogen degradation products is shown in figure 5, and the result shows that a small part of ammonia nitrogen is converted into nitrate nitrogen, and most of ammonia nitrogen can be converted into nitrogen to be discharged out of a water body, so that complete removal of ammonia nitrogen pollutants is facilitated.
Example 2
The degradation effect of ammonia nitrogen under different pH conditions is compared. Ammonia nitrogen concentration 20mg/L, sodium sulfite concentration 0.1M, and bias voltage 0.6V in 100ml water body, slowly introducing air to increase water contentDissolved oxygen, xenon lamp light source (420 nm-800 nm, light intensity of 0.4W/cm)2) Irradiating with 1cm of light2The molybdenum disulfide electrode is used as a photoanode, the graphite electrode is used as a cathode, the pH values of the solutions are respectively adjusted to be 4, 7 and 10 by using 0.1M hydrochloric acid, and the degradation rates of ammonia nitrogen after 6 hours of reaction in the photochemical reaction tank are respectively 8%, 16% and 77%.
Example 3
The degradation effect of ammonia nitrogen under different sodium sulfite concentration conditions is compared. Ammonia nitrogen concentration of 10mg/L (pH 9-10) in 100ml water, bias voltage of 0.6V, slow introduction of air to increase dissolved oxygen in water, xenon lamp light source (420-800 nm, light intensity of 0.4W/cm)2) Irradiating with 1cm of light2The molybdenum disulfide electrode is used as a photoanode, the graphite electrode is used as a cathode, and when the concentration of sodium sulfite is respectively 0.01M, 0.05M and 0.1M, the degradation rates of ammonia nitrogen after 6 hours of reaction in the photochemical reaction tank are respectively 10%, 33% and 77%.
Example 4
The degradation effect of ammonia nitrogen under different external bias conditions is compared. Ammonia nitrogen concentration of 10mg/L (pH 9-10) in 100ml water, slowly introducing air to increase dissolved oxygen in water, xenon lamp light source (420-800 nm, light intensity of 0.4W/cm)2) Irradiating with 1cm of light2When the applied external bias voltage is respectively 0.2V, 0.4V, 0.6V and 0.8V, the degradation rate of ammonia nitrogen after 6 hours of reaction in the photochemical reaction tank is respectively 36%, 59%, 77% and 85%.
Example 5
The degradation effect of ammonia nitrogen under different ammonia nitrogen concentration conditions is compared. The concentration of sodium sulfite in 100ml of water is 0.1M (pH is 9-10), bias voltage is 0.6V, air is slowly introduced to increase dissolved oxygen in water, and xenon lamp light source (420-800 nm, light intensity is 0.4W/cm)2) Irradiating with 1cm of light2The molybdenum disulfide/tungsten disulfide composite electrode is used as a photoanode, the graphite electrode is used as a cathode, when the initial ammonia nitrogen concentration is respectively 5mg/L, 10mg/L, 20mg/L and 40mg/L, the ammonia nitrogen removal rate after 6 hours of reaction in the photochemical reaction tank is respectively 82%, 77%, 70% and 67%.
Example 6
The effect of the dissolved oxygen concentration in water was examined. The concentration of ammonia nitrogen in 100ml of water is 10mg/L, the concentration of sodium sulfite is 0.1M (pH is 9-10), bias voltage is applied to be 0.6V, dissolved oxygen in water is removed by pumping nitrogen, and a xenon lamp light source (420-800 nm, light intensity is 0.4W/cm)2) Irradiating with 1cm of light2The molybdenum disulfide/tungsten disulfide composite electrode is used as a photoanode, the graphite electrode is used as a cathode, the ammonia nitrogen removal rate is 57% after the reaction is carried out for 6 hours in the photochemical reaction tank, and compared with the ammonia nitrogen degradation efficiency when air is introduced, the ammonia nitrogen degradation efficiency is reduced by about 20%.
Example 7
The concentration of ammonia nitrogen in 100ml of water is 10mg/L, the concentration of sodium sulfite is 0.1M (pH is 9-10), bias voltage is 0.1V, air is slowly introduced at the speed of 0.1L/min to increase dissolved oxygen in water, the wavelength is 420-800 nm, and the light intensity is 0.01W/cm2Using a xenon lamp light source of 1cm2The molybdenum disulfide electrode is used as a photoanode, the graphite electrode is used as a cathode, and partial ammonia nitrogen can be removed after the reaction in the photochemical reaction tank is carried out for 1h, wherein the removal rate is about 8%.
Example 8
The ammonia nitrogen concentration of 1L of water is 10mg/L, the sodium sulfite concentration is 2mol/L, the bias voltage is 36V, air is introduced at the speed of 20L/min to increase the dissolved oxygen in water, the wavelength is 420-800 nm, and the light intensity is 5W/cm2Using a xenon lamp light source of 1cm2The molybdenum disulfide electrode is used as a photo-anode, the graphite electrode is used as a cathode, and the ammonia nitrogen removal rate reaches 93 percent after the reaction in the photochemical reaction tank is carried out for 3 hours.
Example 9
The ammonia nitrogen concentration of 500ml of water is 10mg/L, the sodium sulfite concentration is 1mol/L, the external bias voltage is 10V, air is introduced at the speed of 5L/min to increase the dissolved oxygen in water, the wavelength is 420-800 nm, and the light intensity is 2W/cm2Using a xenon lamp light source of 1cm2The molybdenum disulfide electrode is used as a photo-anode, the graphite electrode is used as a cathode, and the ammonia nitrogen removal rate reaches 89% after the reaction in the photochemical reaction tank for 4 hours.
Claims (8)
1. A method for treating ammonia nitrogen pollutants in water by sulfide photoanode activated sulfite is characterized by comprising the following steps: introducing air into the ammonia nitrogen wastewater in the photoelectrochemical cell under the irradiation of visible light, ultraviolet light or sunlight, and simultaneously using a molybdenum disulfide electrode as a photoanode and a graphite electrode as a cathode to apply voltage; the preparation method of the molybdenum disulfide electrode comprises the following steps: s1, placing raw material molybdenum disulfide powder into a beaker filled with an ethanol/water mixed solution with ethanol volume ratio of 45%, processing for 1-10 h by using an ultrasonic processor, controlling the temperature to be 0-60 ℃, so that the raw material molybdenum disulfide powder is peeled into molybdenum disulfide nanosheets, centrifuging, and taking supernatant to obtain dispersion liquid of the molybdenum disulfide nanosheets; s2, adding polyethylene glycol into a beaker filled with water, magnetically stirring the mixture evenly, adding nano titanium dioxide powder into the obtained solution, grinding the mixture in a mortar to form slurry, coating the slurry on the surface of conductive glass in a scraping way, drying the conductive glass at room temperature, and calcining the conductive glass in a muffle furnace at 300-600 ℃ for 1-5 hours to obtain a titanium dioxide substrate electrode; s3, spin-coating the dispersion liquid of the molybdenum disulfide nanosheet on the surface of the titanium dioxide substrate electrode at the temperature of 30-90 ℃ by using a spin coating machine, and annealing the electrode for 1-5 hours at the temperature of 200-500 ℃ in a nitrogen or argon atmosphere to obtain the low-dimensional molybdenum disulfide photoanode.
2. The method for the photoanode activation of sulfite with sulfide of claim 1 to treat ammonia nitrogen pollutants in water, comprising: the intensity of the visible light, the ultraviolet light or the sunlight is 0.01W/cm2~10 W/cm2。
3. The method for the photoanode activation of sulfite with sulfide of claim 1 to treat ammonia nitrogen pollutants in water, comprising: the photoelectrochemical cell is a cell with a light receiving surface made of quartz glass.
4. The method for the photoanode activation of sulfite with sulfide of claim 1 to treat ammonia nitrogen pollutants in water, comprising: the concentration of sulfite in the wastewater is 0.01-3 mol/L.
5. The method for the photoanode activation of sulfite with sulfide of claim 1 to treat ammonia nitrogen pollutants in water, comprising: the external voltage is 0.1V-100V.
6. The method for the photoanode activation of sulfite with sulfide of claim 1 to treat ammonia nitrogen pollutants in water, comprising: the speed of introducing air is 0.1-100L/min.
7. The method for the photoanode activation of sulfite with sulfide of claim 1 to treat ammonia nitrogen pollutants in water, comprising: the reaction time for treating the ammonia nitrogen pollutants in the water is 1-10 h.
8. The method for the photoanode activation of sulfite with sulfide of claim 1 to treat ammonia nitrogen pollutants in water, comprising: in the preparation method of the molybdenum disulfide electrode, the volume ratio of ethanol in the ethanol/water mixed solution is 45%, the ultrasonic power of an ultrasonic processor is 200W-1000W, the centrifugal speed is 2000 rpm-5000 rpm, the concentration of the dissolved polyethylene glycol after being added with water is 0.1 g/ml-2 g/ml, the concentration of the nano titanium dioxide in the polyethylene glycol aqueous solution is 0.1 g/ml-1 g/ml, and the rotating speed of a rotary coating machine is 100 rpm-1000 rpm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811397274.3A CN109574127B (en) | 2018-11-22 | 2018-11-22 | Method for treating ammonia nitrogen pollutants in water by sulfide photoanode activated sulfite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811397274.3A CN109574127B (en) | 2018-11-22 | 2018-11-22 | Method for treating ammonia nitrogen pollutants in water by sulfide photoanode activated sulfite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109574127A CN109574127A (en) | 2019-04-05 |
| CN109574127B true CN109574127B (en) | 2021-07-06 |
Family
ID=65923666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811397274.3A Active CN109574127B (en) | 2018-11-22 | 2018-11-22 | Method for treating ammonia nitrogen pollutants in water by sulfide photoanode activated sulfite |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109574127B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113003819B (en) * | 2021-03-26 | 2023-04-18 | 沈阳大学 | Method for treating organic wastewater by using advanced oxidation system based on semidry flue gas desulfurization ash |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7611620B2 (en) * | 2001-10-22 | 2009-11-03 | Scimst, Inc. | Mediated electrochemical oxidation of organic waste materials |
| CN101973622A (en) * | 2010-10-19 | 2011-02-16 | 哈尔滨工业大学 | Method for accelerating monopersulfate and persulfate to produce free sulfate radicals |
| CN103787448A (en) * | 2014-02-20 | 2014-05-14 | 南京大学 | Denitrification method combining denitrification agent and ultraviolet light |
| CN105819560A (en) * | 2016-03-30 | 2016-08-03 | 中国科学院生态环境研究中心 | Peroxysulphate enhanced photoelectrocatalytic oxidation heavy metal complex and method for recovering heavy metal |
| CN107519877A (en) * | 2017-09-15 | 2017-12-29 | 哈尔滨工程大学 | Catalysis persulfate oxidation goes the method for the catalyst of ammonia nitrogen and catalysis persulfate processing ammonia-nitrogen sewage in water removal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10562801B2 (en) * | 2011-11-07 | 2020-02-18 | Earth Renaissance Technologies, Llc | Redox water treatment method |
-
2018
- 2018-11-22 CN CN201811397274.3A patent/CN109574127B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7611620B2 (en) * | 2001-10-22 | 2009-11-03 | Scimst, Inc. | Mediated electrochemical oxidation of organic waste materials |
| CN101973622A (en) * | 2010-10-19 | 2011-02-16 | 哈尔滨工业大学 | Method for accelerating monopersulfate and persulfate to produce free sulfate radicals |
| CN103787448A (en) * | 2014-02-20 | 2014-05-14 | 南京大学 | Denitrification method combining denitrification agent and ultraviolet light |
| CN105819560A (en) * | 2016-03-30 | 2016-08-03 | 中国科学院生态环境研究中心 | Peroxysulphate enhanced photoelectrocatalytic oxidation heavy metal complex and method for recovering heavy metal |
| CN107519877A (en) * | 2017-09-15 | 2017-12-29 | 哈尔滨工程大学 | Catalysis persulfate oxidation goes the method for the catalyst of ammonia nitrogen and catalysis persulfate processing ammonia-nitrogen sewage in water removal |
Non-Patent Citations (1)
| Title |
|---|
| 亚硫酸盐代替过硫酸盐用于有毒有害污染物处理的探索;周丹娜等;《2015(第三届)西湖国际海水淡化与水再利用大会论文集》;20151231;第79-81页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109574127A (en) | 2019-04-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhao et al. | Enhanced organic pollutants degradation and electricity production simultaneously via strengthening the radicals reaction in a novel Fenton-photocatalytic fuel cell system | |
| Lee et al. | Enhanced electricity generation and degradation of the azo dye Reactive Green 19 in a photocatalytic fuel cell using ZnO/Zn as the photoanode | |
| Li et al. | Photoelectrocatalytic degradation of humic acid in aqueous solution using a Ti/TiO2 mesh photoelectrode | |
| Bessegato et al. | Enhancement of photoelectrocatalysis efficiency by using nanostructured electrodes | |
| CN101653728B (en) | Preparation method and application thereof for zinc ferrite/titanium dioxide nano compounded visible light photocatalyst | |
| CN109772454B (en) | Photocatalytic film, preparation method thereof and application of photocatalytic film in degradation of disinfection byproduct precursor | |
| CN102910767B (en) | Method for removing arsenic by loading titanium dioxide with activated carbon fiber hydrothermal method by means of photoelectrocatalysis oxidation | |
| CN110624569A (en) | MoS doped with metal ions2Method for degrading PPCPs by activating monopersulfate | |
| CN107445244B (en) | Photoelectrocatalysis-chlorine free radical denitrification method | |
| US10717120B2 (en) | Sand/water remediation method with a photocatalytic fuel cell | |
| Liu et al. | Emerging high-ammonia‑nitrogen wastewater remediation by biological treatment and photocatalysis techniques | |
| CN109665598B (en) | Method for generating electricity by carbonate radical photocatalysis waste water | |
| CN112194236A (en) | Method for treating salt-containing degradation-resistant wastewater by activating peroxymonosulfate through biochar-copper oxide composite material | |
| CN112093856B (en) | Single-metal integrated electrode with convertible oxidation state copper and preparation method and application method thereof | |
| Shaban | Effective photocatalytic reduction of Cr (VI) by carbon modified (CM)-n-TiO2 nanoparticles under solar irradiation | |
| CN108675382A (en) | One kind being based on TiO2The integrated catalytic system and its degradation process method of nano pipe light catalyst | |
| CN111825168B (en) | Copper-modified carbon fiber electrode and preparation method and application thereof | |
| Bharath et al. | Photoelectrochemical advanced oxidation processes for simultaneous removal of antibiotics and heavy metal ions in wastewater using 2D-on-2D WS2@ CoFe2O4 heteronanostructures | |
| CN109574127B (en) | Method for treating ammonia nitrogen pollutants in water by sulfide photoanode activated sulfite | |
| CN108940349B (en) | Method for removing dye pollutants by using silver chromate/sulfur-doped nitrogen carbon Z-type photocatalyst | |
| CN112723493B (en) | Cobaltosic oxide/magnesium oxide-titanium composite electrode, preparation method and application thereof, and treatment method of ammonia nitrogen-containing wastewater | |
| Hu et al. | Hollow Fe3+-doped anatase titanium dioxide nanosphere for photocatalytic degradation of organic dyes | |
| Khalik et al. | Converting synthetic azo dye and real textile wastewater into clean energy by using synthesized CuO/C as photocathode in dual-photoelectrode photocatalytic fuel cell | |
| Mei et al. | Ce-Doped Brookite TiO2 Quasi-Nanocubes for Efficient Visible Light Catalytic Degradation of Tetracycline | |
| CN110090657A (en) | A kind of sepiolite composite catalyst and preparation method thereof, novel Fenton-like and its application |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |