CN110590015A - Method for removing nitrite by using manganese dioxide - Google Patents
Method for removing nitrite by using manganese dioxide Download PDFInfo
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- CN110590015A CN110590015A CN201910877662.XA CN201910877662A CN110590015A CN 110590015 A CN110590015 A CN 110590015A CN 201910877662 A CN201910877662 A CN 201910877662A CN 110590015 A CN110590015 A CN 110590015A
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- nitrite
- manganese dioxide
- waste liquid
- hydrochloric acid
- filter residue
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- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 title claims abstract description 106
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 39
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- -1 nitrite ions Chemical class 0.000 claims abstract description 17
- 239000007787 solid Substances 0.000 claims abstract description 14
- 238000004064 recycling Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims description 49
- 239000002699 waste material Substances 0.000 claims description 49
- 239000000243 solution Substances 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 14
- 238000004140 cleaning Methods 0.000 claims description 13
- 238000004458 analytical method Methods 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000000870 ultraviolet spectroscopy Methods 0.000 claims description 9
- 239000007853 buffer solution Substances 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- 239000000706 filtrate Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 238000004448 titration Methods 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- 230000003647 oxidation Effects 0.000 abstract description 10
- 238000007254 oxidation reaction Methods 0.000 abstract description 10
- 241000282414 Homo sapiens Species 0.000 abstract description 7
- 229910002651 NO3 Inorganic materials 0.000 abstract description 7
- 239000013078 crystal Substances 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000003197 catalytic effect Effects 0.000 abstract description 2
- 238000000746 purification Methods 0.000 abstract description 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 8
- 229940005654 nitrite ion Drugs 0.000 description 7
- 230000009471 action Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 235000010288 sodium nitrite Nutrition 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 231100000572 poisoning Toxicity 0.000 description 2
- 230000000607 poisoning effect Effects 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 210000004211 gastric acid Anatomy 0.000 description 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 208000005135 methemoglobinemia Diseases 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 238000004172 nitrogen cycle Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 150000003335 secondary amines Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
-
- 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
- C02F2101/166—Nitrites
Abstract
The invention relates to the field of environment-friendly water purification, in particular to a method for removing nitrite by using manganese dioxide, which utilizes the catalytic oxidation performance and crystal network structure of the manganese dioxide to catalytically oxidize nitrite ions in water into nitrate ions and adsorb the generated nitrate ions so as to achieve the purpose of removing the nitrite ions in the water, so that the method has the advantages of purifying water resources, reducing environmental influence, improving natural ecological environment, improving significance and value of human living environment and the like; meanwhile, the filter residue is recovered into manganese dioxide solid after being cleaned and dried by hydrochloric acid, and the manganese dioxide solid can be reused for removing nitrite ions, so that the resource recycling is realized, and the method is energy-saving and environment-friendly.
Description
Technical Field
The invention relates to the field of environment-friendly water purification, and particularly relates to a method for removing nitrite by using manganese dioxide.
Background
Nitrite, as a natural component of nitrogen cycle in ecosystems, is widely present in natural waters. Secondly, nitrite is mainly generated by nitrogen-containing chemical substances in fertilizers, feeds and pesticides under the action of microorganisms and exists in rivers and lakes. In addition, nitrite is also present in industrial waste salts and nitrite waste water. Nitrite has a certain biological toxicity, is a toxic and harmful substance and has toxic action on human beings and animals. If the nitrite is ingested into a human body, the nitrite can react with secondary amine under the gastric acid condition of the human body to form nitrite amine, so that not only can a strong 'three-cause' effect be generated, but also the blood oxygen transfusion capability can be reduced, and the methemoglobinemia is caused, generally 0.2 g-0.5 g of the nitrite can be ingested to cause poisoning, and 3g of the nitrite can cause poisoning and death; if the nitrite is stored in the open air for a long time, the nitrite can absorb moisture or be washed by rainwater, underground water resources are easily polluted, the nitrite cannot be used as a drinking water source for life, the surrounding natural ecological environment is seriously damaged, and the nitrite with a certain concentration can cause natural water eutrophication, so that the nitrite is a potential dangerous object.
At present, the domestic and foreign methods for removing nitrite mainly comprise a biological degradation method and a chemical oxidation method. The biodegradation method is a common method, but the method is limited by temperature, NaCl concentration and field, and has certain limitation. Chemical oxidation methods (including ozone oxidation, hypochlorous acid oxidation, electrochemical oxidation, photocatalytic oxidation and other methods) can oxidize nitrite into nitrate with lower toxicity, and have the characteristic of simple process, but have the defects of incomplete degradation, high equipment investment, high operation cost and the like.
Based on this, the present invention provides a method for removing nitrite by using manganese dioxide, which solves the above problems.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for removing nitrite by using manganese dioxide, which has the advantages of purifying water resources, recycling resources, reducing environmental impact, improving natural ecological environment, improving significance and value of human living environment and the like.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for removing nitrite by using manganese dioxide comprises the following steps:
s1, adjusting concentration: mixing the waste liquid containing the nitrite with deionized water, and adjusting the concentration of the waste liquid containing the nitrite to 25-200 mug/mL to obtain primary waste liquid;
s2: adjusting the pH, namely adding the birutan-raubison buffer solution into the primary waste liquid to adjust the pH to obtain standard waste liquid;
s3: removing nitrite: weighing 100mL of standard waste liquid, adding into a 250mL triangular flask with a plug, adding 5-8g of manganese dioxide into the standard waste liquid, uniformly mixing, shaking at normal temperature for 30min, and filtering at normal pressure after the reaction is finished to remove nitrite;
s4: and recycling filter residues: and cleaning the filter residue by using a hydrochloric acid solution, drying the cleaned filter residue in an oven, and repeatedly performing S3 on the manganese dioxide solid to remove nitrite.
Preferably, the pH value in S2 is 1.6-2.0.
Preferably, the filtrate in the step S3 is subjected to nitrite ion detection by using an ultraviolet-visible spectrophotometer with the wavelength of 532nm or a rapid water quality detection device or a titration analysis method.
Preferably, the weight of the hydrochloric acid in the S4 is the same as that of the filter residue.
Preferably, the hydrochloric acid washing time in the S4 is 28-32 min.
Preferably, the drying temperature in S4 is controlled at 105 ℃ to 115 ℃.
Has the advantages that:
manganese dioxide is a stable black powder or black brown crystalline or amorphous powdery solid at room temperature; by combining XRD and SEM crystal structure characterization instruments, manganese dioxide is divided into five crystal forms of alpha, beta, gamma, delta and lambda, and has more than 30 crystal structures. Most commonly, the [ MnO6] octahedra share vertices or edges with adjacent octahedra, thereby forming complex networks that can accommodate water molecules as well as different ions, thus resulting in a diversity of manganese dioxide crystal structures and compositions.
The invention utilizes the catalytic oxidation performance of manganese dioxide and the crystal network structure to catalytically oxidize nitrite ions in water into nitrate ions and adsorb the generated nitrate ions, thereby achieving the purpose of removing nitrite ions in water, and having the advantages of purifying water resources, reducing environmental influence, improving natural ecological environment, improving significance and value of human living environment and the like; meanwhile, the filter residue is recovered into manganese dioxide solid after being cleaned and dried by hydrochloric acid, and the manganese dioxide solid can be reused for removing nitrite ions, so that the resource recycling is realized, and the method is energy-saving and environment-friendly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 shows the removal rate of the manganese dioxide of the present invention for the oxidation removal of nitrite;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
a method for removing nitrite by using manganese dioxide comprises the following steps:
s1, adjusting concentration: mixing the waste liquid containing the nitrite with deionized water, and adjusting the concentration of the waste liquid containing the nitrite to 25 mug/mL to obtain primary waste liquid;
s2: adjusting the pH, namely adding the birutan-raubison buffer solution into the primary waste liquid to adjust the pH value to 1.6 to obtain standard waste liquid;
s3: removing nitrite: weighing 100mL of standard waste liquid, adding into a 250mL triangular flask with a plug, adding 5g of manganese dioxide into the standard waste liquid, uniformly mixing, shaking for 30min at normal temperature, filtering at normal pressure after the reaction is finished, and performing nitrite ion detection on the filtrate by adopting an ultraviolet-visible spectrophotometer with the wavelength of 532nm or a water quality rapid detection device or a titration analysis method to remove nitrite;
s4: and recycling filter residues: and cleaning the filter residue by using a hydrochloric acid solution, wherein the hydrochloric acid cleaning time is 32min, the weight of hydrochloric acid is the same as that of the filter residue, drying the cleaned filter residue in an oven, controlling the drying temperature to be 105 ℃, and repeatedly performing S3 on the manganese dioxide solid to remove nitrite.
Example 2:
a method for removing nitrite by using manganese dioxide comprises the following steps:
s1, adjusting concentration: mixing the waste liquid containing the nitrite with deionized water, and adjusting the concentration of the waste liquid containing the nitrite to 50 mug/mL to obtain primary waste liquid;
s2: adjusting the pH, namely adding the birutan-raubison buffer solution into the primary waste liquid to adjust the pH value to 1.8 to obtain standard waste liquid;
s3: removing nitrite: weighing 100mL of standard waste liquid, adding into a 250mL triangular flask with a plug, adding 6g of manganese dioxide into the standard waste liquid, uniformly mixing, shaking for 30min at normal temperature, filtering at normal pressure after the reaction is finished, and performing nitrite ion detection on the filtrate by adopting an ultraviolet-visible spectrophotometer with the wavelength of 532nm or a water quality rapid detection device or a titration analysis method to remove nitrite;
s4: and recycling filter residues: and cleaning the filter residue by using a hydrochloric acid solution, wherein the hydrochloric acid cleaning time is 28min, the weight of hydrochloric acid is the same as that of the filter residue, drying the cleaned filter residue in an oven, controlling the drying temperature to be 115 ℃, and repeatedly performing S3 on the manganese dioxide solid to remove nitrite.
Example 3:
a method for removing nitrite by using manganese dioxide comprises the following steps:
s1, adjusting concentration: mixing the waste liquid containing the nitrite with deionized water, and adjusting the concentration of the waste liquid containing the nitrite to 100 mug/mL to obtain primary waste liquid;
s2: adjusting the pH, namely adding the birutan-raubison buffer solution into the primary waste liquid to adjust the pH value to 2 to obtain standard waste liquid;
s3: removing nitrite: weighing 100mL of standard waste liquid, adding into a 250mL triangular flask with a plug, adding 7g of manganese dioxide into the standard waste liquid, uniformly mixing, shaking for 30min at normal temperature, filtering at normal pressure after the reaction is finished, and performing nitrite ion detection on the filtrate by adopting an ultraviolet-visible spectrophotometer with the wavelength of 532nm or a water quality rapid detection device or a titration analysis method to remove nitrite;
s4: and recycling filter residues: and cleaning the filter residue by using a hydrochloric acid solution, wherein the hydrochloric acid cleaning time is 29min, the weight of hydrochloric acid is the same as that of the filter residue, drying the cleaned filter residue in an oven, controlling the drying temperature to be 110 ℃, and repeatedly performing S3 on the manganese dioxide solid to remove nitrite.
Example 4:
a method for removing nitrite by using manganese dioxide comprises the following steps:
s1, adjusting concentration: mixing the waste liquid containing the nitrite with deionized water, and adjusting the concentration of the waste liquid containing the nitrite to 150 mug/mL to obtain primary waste liquid;
s2: adjusting the pH, namely adding the birutan-raubison buffer solution into the primary waste liquid to adjust the pH value to 1.9 to obtain standard waste liquid;
s3: removing nitrite: weighing 100mL of standard waste liquid, adding into a 250mL triangular flask with a plug, adding 8g of manganese dioxide into the standard waste liquid, uniformly mixing, shaking for 30min at normal temperature, filtering at normal pressure after the reaction is finished, and performing nitrite ion detection on the filtrate by adopting an ultraviolet-visible spectrophotometer with the wavelength of 532nm or a water quality rapid detection device or a titration analysis method to remove nitrite;
s4: and recycling filter residues: and cleaning the filter residue by using a hydrochloric acid solution, wherein the hydrochloric acid cleaning time is 30min, the weight of the hydrochloric acid is the same as that of the filter residue, drying the cleaned filter residue in an oven, controlling the drying temperature to be 112 ℃, and repeatedly performing S3 on the manganese dioxide solid to remove nitrite.
Example 5:
a method for removing nitrite by using manganese dioxide comprises the following steps:
s1, adjusting concentration: mixing the waste liquid containing the nitrite with deionized water, and adjusting the concentration of the waste liquid containing the nitrite to 200 mug/mL to obtain primary waste liquid;
s2: adjusting the pH, namely adding the birutan-raubison buffer solution into the primary waste liquid to adjust the pH value to 1.7 to obtain standard waste liquid;
s3: removing nitrite: weighing 100mL of standard waste liquid, adding into a 250mL triangular flask with a plug, adding 6g of manganese dioxide into the standard waste liquid, uniformly mixing, shaking for 30min at normal temperature, filtering at normal pressure after the reaction is finished, and performing nitrite ion detection on the filtrate by adopting an ultraviolet-visible spectrophotometer with the wavelength of 532nm or a water quality rapid detection device or a titration analysis method to remove nitrite;
s4: and recycling filter residues: and cleaning the filter residue by using a hydrochloric acid solution, wherein the hydrochloric acid cleaning time is 31min, the weight of the hydrochloric acid is the same as that of the filter residue, drying the cleaned filter residue in an oven, controlling the drying temperature to be 108 ℃, and repeatedly performing S3 on the manganese dioxide solid to remove nitrite.
The experimental data are as follows:
result analysis of different concentrations of nitrite by oxidation of manganese dioxide
After sodium nitrite solutions with different initial concentrations react for 30min, detection and analysis are carried out according to nitrite ions under an ultraviolet-visible spectrophotometer with the wavelength of 532nm, and analysis results are shown in table 1.
TABLE 1 nitrite ion concentrations before and after reaction
As can be seen from Table 1, after sodium nitrite solutions with different initial concentrations react for about 30min, the concentration of nitrite is found to change obviously, and the change is particularly obvious when the initial concentrations of the sodium nitrite solutions are 100 mug/mL, 150 mug/mL and 200 mug/mL, so that manganese dioxide has extremely strong oxidability to the nitrite, nitrate ions in water are adsorbed by utilizing the crystal network structure of the manganese dioxide, and the purpose of removing the nitrate ions in the water is achieved, so that the method has the advantages of purifying water resources, reducing environmental influence, improving natural ecological environment, improving significance and value of human living environment and the like, and the optimal concentration of the nitrite oxidized by the manganese dioxide is between 100 mug/mL and 200 mug/mL.
Second, analysis of recycling result of removing nitrite by manganese dioxide oxidation
Performing three reactions on sodium nitrite solution with the same initial concentration, averagely reacting for 30min each time, detecting and analyzing the nitrite ions under an ultraviolet-visible spectrophotometer with the wavelength of 532nm, calculating the removal rate, and obtaining the analysis result shown in figure 1
In fig. 1: removal rate α ═ m0-m1)/m0)*100％
Alpha is the removal rate, m0Mass of nitrite before reaction, m1Is the quality of the nitrite after the reaction.
As can be seen from the histogram in fig. 1, when the nitrite concentration is 25.00 μ g/mL, the first removal rate of nitrite is 63.11%, the second removal rate is 62.12%, and the third removal rate is 57.19%; when the concentration of nitrite is 50.00 mu g/mL, the first removal rate of manganese dioxide to the nitrite is 81.31 percent, the second removal rate is 80.57 percent, and the third removal rate is 79.83 percent; when the concentration of nitrite is 100 mu g/mL, the first removal rate of manganese dioxide to the nitrite is 92.38 percent, the second removal rate is 92.14 percent, and the third removal rate is 90.90 percent; when the concentration of nitrite is 150 mug/mL, the first removal rate of manganese dioxide to the nitrite is 94.92%, the second removal rate is 94.84%, and the third removal rate is 94.76%; when the concentration of nitrite is 200 mug/mL, the first removal rate of manganese dioxide is 96.19%, the second removal rate is 96.13% and the third removal rate is 96.07%.
Therefore, the removal of nitrite by manganese dioxide is obvious in step 1, filter residues are recovered to be manganese dioxide solid after being washed and dried by hydrochloric acid, and the manganese dioxide solid can be reused for removing nitrite ions, so that the resource recycling is realized, and the energy is saved and the environment is protected;
2. the removal rate is continuously increased along with the increase of the nitrite concentration, and the method is particularly suitable for removing nitrite solution with higher concentration.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for removing nitrite by using manganese dioxide is characterized by comprising the following steps:
s1, adjusting concentration: mixing the waste liquid containing the nitrite with deionized water, and adjusting the concentration of the waste liquid containing the nitrite to 25-200 mug/mL to obtain primary waste liquid;
s2: adjusting the pH, namely adding the birutan-raubison buffer solution into the primary waste liquid to adjust the pH to obtain standard waste liquid;
s3: removing nitrite: weighing 100mL of standard waste liquid, adding into a 250mL triangular flask with a plug, adding 5-8g of manganese dioxide into the standard waste liquid, uniformly mixing, shaking at normal temperature for 30min, and filtering at normal pressure after the reaction is finished to remove nitrite;
s4: and recycling filter residues: and cleaning the filter residue by using a hydrochloric acid solution, drying the cleaned filter residue in an oven, and repeatedly performing S3 on the manganese dioxide solid to remove nitrite.
2. The method for removing nitrite with manganese dioxide as claimed in claim 1, wherein the pH value in S2 is 1.6-2.0.
3. The method as claimed in claim 1, wherein the method comprises the steps of: and (3) detecting nitrite ions in the filtrate in the S3 by adopting an ultraviolet-visible spectrophotometer with the wavelength of 532nm or a rapid water quality detection device or a titration analysis method.
4. The method for removing nitrite using manganese dioxide as claimed in claim 1, wherein: and the weight of the hydrochloric acid in the S4 is the same as that of the filter residue.
5. The method for removing nitrite using manganese dioxide as claimed in claim 1, wherein: and the hydrochloric acid cleaning time in the S4 is 28-32 min.
6. The method for removing nitrite using manganese dioxide as claimed in claim 1, wherein: the drying temperature in the S4 is controlled at 105 ℃ and 115 ℃.
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| CN103102002A (en) * | 2011-11-09 | 2013-05-15 | 中国科学院金属研究所 | Application of Pd/Fe3O4 catalyst in removing nitrate or nitrite from water solution |
| CN107973323A (en) * | 2017-12-06 | 2018-05-01 | 中国科学院过程工程研究所 | A kind of method for oxidation of desulphurization denitration waste liquid Nitrite ion |
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