CN114956297A - La 2 CuO 4 Method for treating formaldehyde wastewater by catalytic oxidation - Google Patents
La 2 CuO 4 Method for treating formaldehyde wastewater by catalytic oxidation Download PDFInfo
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- CN114956297A CN114956297A CN202210477389.3A CN202210477389A CN114956297A CN 114956297 A CN114956297 A CN 114956297A CN 202210477389 A CN202210477389 A CN 202210477389A CN 114956297 A CN114956297 A CN 114956297A
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- Prior art keywords
- formaldehyde
- wastewater
- cuo
- catalytic oxidation
- potassium hydrogen
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/83—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with rare earths or actinides
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Materials Engineering (AREA)
- Catalysts (AREA)
Abstract
The invention relates to La 2 CuO 4 A method for treating formaldehyde wastewater by catalytic oxidation belongs to the technical field of wastewater treatment. With La 2 CuO 4 Potassium hydrogen persulfate is taken as an oxidizing reagent, and is stirred and reacted for 1-60min at the temperature of 25-60 ℃, so that formaldehyde in the wastewater is catalytically oxidized into carbon dioxide and water. The method can effectively remove formaldehyde in the wastewater, the catalyst is easy to recover and can be reused, and the excessive potassium hydrogen persulfate is decomposed into potassium sulfate and oxygen.
Description
Technical Field
The invention relates to La 2 CuO 4 Method for treating formaldehyde wastewater by catalytic oxidation, in particular to a method for treating formaldehyde wastewater by La 2 CuO 4 A method for catalyzing and oxidizing formaldehyde in wastewater by taking potassium hydrogen persulfate as an oxidizing reagent as a catalyst, belonging to the technical field of wastewater treatment.
Background
Formaldehyde is widely used in various fields such as medicine, building materials, chemical engineering and the like, but is a substance with strong biological toxicity. When the patient is in formaldehyde-polluted environment for a long time, dizziness, nausea, immunologic function reduction, liver and lung dysfunction, respiratory diseases and the like can occur, and death can be caused seriously. The discharge of industrial waste water is a source of generating a large amount of formaldehyde, which causes pollution to our living environment and air.
At present, the treatment method of formaldehyde in the wastewater comprises a physical adsorption method, a chemical oxidation method and a biological method. The adsorption method is very simple and low in cost, but the adsorbent has limited adsorption capacity, is easy to adsorb and saturate, needs to be replaced frequently, cannot be operated continuously, is easy to desorb, causes secondary pollution, and cannot completely remove formaldehyde in the wastewater in practical application. The biological method can convert formaldehyde into non-toxic and harmless carbon dioxide and water, is a method without generating secondary pollution, but is only suitable for treating low-concentration formaldehyde wastewater. Redek et al studied the formaldehyde degradation effect of Pseudomonas and Bacillus and found that the formaldehyde degradation rate was over 90% at a formaldehyde concentration of 1mg/ml, less than 50% at a formaldehyde concentration of 1.5mg/ml, and less than 10% at a formaldehyde concentration of 2 mg/ml. (Leidedin, Zhang Shi, Liubo, Yang Xinghao, Zhu nan Feng, separation and screening of efficient formaldehyde degrading bacteria and application [ J ] Chinese artificial board, 2018, 25 (9): 12-17). The catalytic oxidation method saves energy, can oxidize the formaldehyde into nontoxic substances, has good purification effect, does not produce secondary pollution, and is an effective method for removing the formaldehyde with application prospect. The core of the catalytic oxidation technology is the selection of the catalyst, so an economical, efficient and feasible catalyst needs to be explored and searched for catalytically oxidizing the formaldehyde in the wastewater.
Disclosure of Invention
The invention aims to provide La 2 CuO 4 A method for treating formaldehyde wastewater by catalytic oxidation.
The technical solution for realizing the purpose of the invention is as follows: la 2 CuO 4 A process for treating formaldehyde waste water by catalytic oxidation includes sequentially adding La to the waste water containing formaldehyde 2 CuO 4 And potassium hydrogen persulfate, and stirring and reacting at 25-60 deg.C for 1-60 min.
The concentration of the formaldehyde in the wastewater is 500-5000 mg/L.
The addition of La 2 CuO 4 To La in the wastewater 2 CuO 4 The final concentration of (B) is 0.1-1.2 wt%.
The amount of the potassium hydrogen persulfate added is 1 to 10 weight percent of the final concentration of the potassium hydrogen persulfate in the wastewater.
The reaction temperature is 25-60 ℃.
The reaction time is 1-60 min.
La as defined in the present invention 2 CuO 4 The reaction mechanism that potassium hydrogen persulfate is used as an oxidizing reagent and formaldehyde in the wastewater is catalytically oxidized into carbon dioxide and water is as follows: la 2 CuO 4 La in (2) activates carbonyl in formaldehyde, La 2 CuO 4 Activating potassium hydrogen persulfate by medium Cu to generate SO with stronger oxidation 4 - And HO, thereby facilitating the oxidation reaction of formaldehyde.
Compared with the prior art, the invention has the following remarkable advantages: (1) the invention uses La 2 CuO 4 The catalyst is insoluble in water, is easy to recover and does not produce secondary pollution. (2) La in the present invention 2 CuO 4 Can activate the carbonyl in the formaldehyde and can also activate the oxidant potassium hydrogen persulfate. (3) The invention takes the potassium hydrogen persulfate as an oxidizing reagent, and the potassium hydrogen persulfate is converted into potassium sulfate, water and oxygen after the catalytic oxidation reaction is finished, thereby reducing the environmental pollution. (4) The conversion rate of the formaldehyde in the formaldehyde wastewater with the concentration of 500-5000mg/L is more than 98 percent. (5) The method is economical and efficient (the dosage of the catalyst and the oxidant is small, and the catalytic oxidation reaction time is short).
Detailed Description
The method is described in detail below with specific examples, which are not meant to limit the scope of the invention of this patent.
Catalyst La in the present invention 2 CuO 4 The preparation method adopts a sol-gel method and comprises the following specific steps: respectively weighing a certain mass of copper nitrate and lanthanum nitrate according to the molar ratio of the copper nitrate to the lanthanum nitrate of 1/2, dissolving the copper nitrate and the lanthanum nitrate into a certain amount of deionized water, adding a certain amount of citric acid (the molar ratio of the citric acid to the lanthanum nitrate is 3/1) under the stirring condition after the copper nitrate and the lanthanum nitrate are completely dissolved, heating to 80 ℃ under the stirring condition, reacting until the solution forms gel, drying and roasting to obtain La 2 CuO 4 。
Example 1
Adding wastewater with formaldehyde concentration of 5000mg/L into a 100mL three-neck flask, and then sequentially adding La 2 CuO 4 And potassium hydrogen persulfate to La in the wastewater 2 CuO 4 Was 1.2 wt% and oxone was 2 wt%, and was reacted at 25 ℃ for 5min with stirring, followed by liquid chromatography analysis, and the conversion of formaldehyde was found to be 98.8%.
Example 2
Adding wastewater with 500mg/L of formaldehyde into a 100mL three-neck flask, and then sequentially adding La 2 CuO 4 And potassium hydrogen persulfate to La in the wastewater 2 CuO 4 Was 1.2 wt% and oxone was 2 wt%, and was reacted at 25 ℃ for 5min with stirring, followed by liquid chromatography analysis, and the conversion of formaldehyde was determined to be 98.1%.
Example 3
Adding wastewater with formaldehyde concentration of 5000mg/L into a 100mL three-neck flask, and then sequentially adding La 2 CuO 4 And potassium hydrogen persulfate to La in the wastewater 2 CuO 4 0.1 wt% and 10 wt% of oxone, and was reacted at 25 ℃ for 60min with stirring, followed by liquid chromatography analysis, and the conversion of formaldehyde was found to be 99.5%.
Example 4
Adding wastewater with formaldehyde concentration of 5000mg/L into a 100mL three-neck flask, and then sequentially adding La 2 CuO 4 And potassium hydrogen persulfate to La in the wastewater 2 CuO 4 0.8 wt% and 5 wt% of oxone, and the reaction was stirred at 60 ℃ for 1min and then subjected to liquid chromatography analysis, whereby the conversion of formaldehyde was found to be 99.3%.
Example 5
Adding wastewater with formaldehyde concentration of 5000mg/L into a 100mL three-neck flask, and then sequentially adding La 2 CuO 4 And potassium hydrogen persulfate to La in the wastewater 2 CuO 4 The final concentration of the potassium hydrogen persulfate is 1.2wt percent, the final concentration of the potassium hydrogen persulfate is 1wt percent, the stirring reaction is carried out for 60min at the temperature of 25 ℃,then, liquid chromatography analysis was performed, and the conversion of formaldehyde was found to be 98.6%.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. La 2 CuO 4 The method for treating the formaldehyde wastewater by catalytic oxidation is characterized in that La is sequentially added into the formaldehyde-containing wastewater 2 CuO 4 And potassium hydrogen persulfate to catalyze the oxidation reaction of formaldehyde in the wastewater.
2. La according to claim 1 2 CuO 4 The method for treating the formaldehyde wastewater by catalytic oxidation is characterized in that the concentration of formaldehyde in the formaldehyde-containing wastewater is 500-5000 mg/L.
3. La according to claim 1 2 CuO 4 The method for treating the formaldehyde wastewater by catalytic oxidation is characterized in that La is added 2 CuO 4 To La in the wastewater 2 CuO 4 The final concentration is 0.1-1.2 wt%.
4. La according to claim 1 2 CuO 4 The method for treating the formaldehyde wastewater by catalytic oxidation is characterized in that the amount of the potassium hydrogen persulfate added is 1 to 10 weight percent of the final concentration of the potassium hydrogen persulfate in the wastewater.
5. La according to claim 1 2 CuO 4 The method for treating the formaldehyde wastewater by catalytic oxidation is characterized in that the reaction temperature is 25-60 ℃.
6. The method of claim 1La 2 CuO 4 The method for treating the formaldehyde wastewater by catalytic oxidation is characterized in that the reaction time is 1-60 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210477389.3A CN114956297A (en) | 2022-04-20 | 2022-04-20 | La 2 CuO 4 Method for treating formaldehyde wastewater by catalytic oxidation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210477389.3A CN114956297A (en) | 2022-04-20 | 2022-04-20 | La 2 CuO 4 Method for treating formaldehyde wastewater by catalytic oxidation |
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| CN114956297A true CN114956297A (en) | 2022-08-30 |
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| CN202210477389.3A Pending CN114956297A (en) | 2022-04-20 | 2022-04-20 | La 2 CuO 4 Method for treating formaldehyde wastewater by catalytic oxidation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115504546A (en) * | 2022-10-11 | 2022-12-23 | 北京北方节能环保有限公司 | La prepared by adopting spark plasma sintering technology 2 CuO 4 Method for perovskite/foamed nickel electrode |
-
2022
- 2022-04-20 CN CN202210477389.3A patent/CN114956297A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115504546A (en) * | 2022-10-11 | 2022-12-23 | 北京北方节能环保有限公司 | La prepared by adopting spark plasma sintering technology 2 CuO 4 Method for perovskite/foamed nickel electrode |
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