Method for preparing potassium manganate solution

Abstract

The invention discloses a method for preparing a potassium manganate solution, and belongs to the technical field of chemistry and chemical engineering. The preparation method comprises the following steps: adding a potassium permanganate solution into an alkaline solution, and stirring and reacting under the irradiation of a light source to obtain a potassium manganate solution; wherein the wavelength of the light source ranges from 365 nm to 560 nm. By accurately controlling the wavelength range of the light source, the specific reaction steps can be more effectively initiated and promoted by light excitation energy, so that the generation efficiency and the yield of potassium manganate are improved. Meanwhile, the selection of the specific wavelength can be beneficial to reducing side reactions and improving the selectivity of the reaction, so that the potassium manganate solution with higher purity is obtained, and the method has economical efficiency, practicability and environmental friendliness. The potassium manganate solution prepared by the method can be used for water treatment process experiments.

Description

Technical Field

[0001] The invention relates to the technical field of chemistry and chemical engineering, and in particular to a method for preparing a potassium manganate solution. Background Art

[0002] Potassium manganate is an oxidant with high oxidizing strength. It is mainly used for bleaching oils, fibers, and leathers. It can also be used as disinfectant and photographic materials. Like potassium permanganate, potassium manganate can be used as an oxidant, and can also be chemically reduced by manganate to form insoluble manganese dioxide as a coagulant / adsorbent for purifying and disinfecting drinking water and sewage. At present, the methods for producing potassium manganate crystals are mainly divided into two categories: solid phase method and liquid phase method. The solid phase method has high reaction temperature and high energy consumption, and the reaction speed is slow, and the production efficiency is relatively low; the product purity is sometimes difficult to guarantee and may contain more impurities; the liquid phase method has strict control requirements on the reaction conditions, such as temperature, pressure, solution concentration, etc.; the process flow is relatively complex and the operation is difficult; more chemical reagents may be required, which increases the cost and difficulty of subsequent processing.

[0003] Potassium manganate is also used as a water treatment agent to purify and disinfect drinking water and sewage. However, there is little research on the application of potassium manganate in water treatment processes, which makes the methods for preparing potassium manganate solutions in the laboratory relatively limited.

[0004] Therefore, a method for preparing a potassium manganate solution is required, which has significant economy and practicability, and the prepared potassium manganate solution can be used for water treatment process experiments. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a method for preparing a potassium manganate solution, which has significant economy and practicability, and the prepared potassium manganate solution can be used for water treatment process experiments.

[0006] The first aspect of the present invention provides a method for preparing a potassium manganate solution, comprising adding a potassium permanganate solution to an alkaline solution, and stirring the solution under irradiation with a light source to obtain the potassium manganate solution;

[0007] Wherein, the wavelength of the light source is 365-560nm.

[0008] The preparation method according to the first aspect of the present invention has at least the following beneficial effects:

[0009] The method for preparing potassium manganate solution of the present invention can obtain potassium manganate solution by controlling the wavelength of light source to irradiate potassium permanganate solution. Under alkaline conditions, when a light source of a specific wavelength (365-560nm) irradiates potassium permanganate solution, light energy is absorbed by potassium permanganate molecules, and potassium permanganate absorbs photons and is converted into excited potassium permanganate, and then the excited potassium permanganate is converted into Mn (V) and Mn (III) under illumination, and in an alkaline environment, Mn (III) further reacts with potassium permanganate to generate potassium manganate. Compared with traditional technology, the present invention can more effectively trigger and promote these specific reaction steps by accurately controlling the wavelength range of the light source, thereby improving the generation efficiency and yield of potassium manganate. At the same time, the selection of specific wavelength may help to reduce the occurrence of side reactions and improve the selectivity of the reaction, thereby obtaining a potassium manganate solution with higher purity.

[0010] In terms of economy, compared with the traditional solid phase method and liquid phase method, the present invention avoids the problems of high temperature energy consumption, slow reaction speed and difficult product purity guarantee in the solid phase method, and overcomes the defects of strict control of reaction conditions, complex process flow and increased cost caused by the use of many chemical reagents in the liquid phase method, significantly reducing production costs and improving production efficiency; in terms of practicality, it is easy to operate, has low requirements for equipment and technology, and is easy to implement and promote in a laboratory environment. By irradiating a light source of a specific wavelength in combination with a stirring reaction, the reaction conditions are mild and easy to control, and potassium manganate solution can be stably prepared. The potassium manganate solution prepared by the present invention has a high purity, and the generation of impurities is effectively reduced by accurately controlling parameters such as the wavelength of the light source, the concentration of the solution, the stirring speed and the reaction time, thereby ensuring the quality of the product.

[0011] The potassium manganate solution prepared by the present invention has important application value in water treatment process experiments. It provides new research directions and experimental materials for the field of water treatment, helps to deeply explore the effects and mechanisms of potassium manganate in purifying and disinfecting drinking water and sewage, and promotes the development of water treatment technology. In addition, the method of the present invention is environmentally friendly, reduces energy consumption and excessive use of chemical reagents, and meets the needs of sustainable development.

[0012] According to some embodiments of the present invention, the wavelength of the light source is 365-560 nm, for example, 365 nm, 405 nm, 440 nm, or 560 nm.

[0013] According to some embodiments of the invention, the alkaline solution is a sodium hydroxide solution.

[0014] According to some embodiments of the present invention, the concentration of the alkaline solution is 0.1-1M.

[0015] Preferably, the concentration of the alkaline solution is 0.1M.

[0016] According to some embodiments of the present invention, the concentration of the potassium permanganate solution is 0.1-1M.

[0017] Preferably, the concentration of the potassium permanganate solution is 0.1M.

[0018] According to some embodiments of the present invention, the stirring reaction speed is 500-650 r / min.

[0019] Preferably, the stirring reaction speed is 600 r / min.

[0020] According to some embodiments of the present invention, the stirring reaction time is 20 to 40 minutes.

[0021] Preferably, the stirring reaction time is 30 min.

[0022] According to some embodiments of the present invention, the method for preparing a potassium manganate solution further comprises a pH adjustment step.

[0023] According to some embodiments of the present invention, the pH value of the potassium manganate solution is 10-14.

[0024] A second aspect of the present invention provides a potassium manganate solution prepared by the above method for preparing the potassium manganate solution.

[0025] The third aspect of the present invention provides an application of the potassium manganate solution prepared by the above method in laboratory research of water treatment process.

[0026] According to some embodiments of the present invention, the water includes one of river water, lake water, domestic or industrial wastewater or sewage containing trace organic pollutants.

[0027] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 This is a graph showing changes in the absorption spectrum characteristics in Example 1 of the present invention. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and the same or similar reference numerals throughout the embodiments represent the same or similar elements or elements with the same or similar functions. The embodiments described below are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present invention, if there is a description of first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] The words "preferably", "more preferably", etc. in the present invention refer to embodiments of the present invention that may provide certain beneficial effects in certain circumstances. However, other embodiments may also be preferred under the same circumstances or other circumstances. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not applicable, nor is it intended to exclude other embodiments from the scope of the present invention.

[0033] When a numerical range is disclosed herein, the above range is considered to be continuous and includes the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be combined. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0034] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0035] Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0036] Example 1

[0037] This embodiment provides a method for preparing a potassium manganate solution, comprising the following steps:

[0038] A 0.1 M potassium permanganate solution (CAS No.: 7722-64-7) was added to a 0.1 M sodium hydroxide solution, and then the solution was irradiated with a 365 nm LED lamp, stirred at a speed of 600 r / min, and reacted for 30 minutes to obtain a potassium manganate solution.

[0039] Example 2

[0040] This embodiment provides a method for preparing a potassium manganate solution, comprising the following steps:

[0041] A 0.1 M potassium permanganate solution (CAS No.: 7722-64-7) was added to a 0.1 M sodium hydroxide solution, and then the solution was irradiated with a 405 nm LED lamp, and the stirring speed was 600 r / min. The reaction was stirred for 30 minutes to obtain a potassium manganate solution.

[0042] Example 3

[0043] This embodiment provides a method for preparing a potassium manganate solution, comprising the following steps:

[0044] A 0.1 M potassium permanganate solution (CAS No.: 7722-64-7) was added to a 0.1 M sodium hydroxide solution, and then the solution was irradiated with a 440 nm LED lamp, and the stirring speed was 600 r / min. The reaction was stirred for 30 minutes to obtain a potassium manganate solution.

[0045] Example 4

[0046] This embodiment provides a method for preparing a potassium manganate solution, comprising the following steps:

[0047] A 0.1 M potassium permanganate solution (CAS No.: 7722-64-7) was added to a 0.1 M sodium hydroxide solution, and then the solution was irradiated with a 560 nm LED lamp, stirred at a speed of 600 r / min, and reacted for 30 minutes to obtain a potassium manganate solution.

[0048] Test Case

[0049] In this test example, a spectrophotometer was used to test the change in absorption spectrum characteristics of the potassium manganate solution prepared by the method of Example 1.

[0050] The absorbance of the solution in the range of 200 nm to 800 nm was measured using a Shimadzu UV-1900 automatic scanning ultraviolet-visible spectrophotometer (UV-1900, Shimadzu Co., Japan), and the absorbance data of the solution before and after the reaction were recorded.

[0051] Results: The solution before the reaction had no absorption peak at 610nm, but had an obvious absorption peak at 525nm. After the reaction, the solution showed a characteristic peak of hexavalent manganese at 610nm, while the absorption peak of heptavalent manganese at 525nm disappeared. Figure 1 Therefore, it can be confirmed that potassium permanganate solution is successfully converted into potassium manganate solution under specific conditions, and its absorption spectrum characteristics have changed significantly.

[0052] The above is a detailed description of the embodiments of the present invention, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A method for preparing a potassium manganate solution, characterized in that: The method comprises adding a potassium permanganate solution to an alkaline solution, and stirring the solution under irradiation with a light source to obtain a potassium manganate solution; Wherein, the wavelength of the light source is 365-560nm.

2. The method according to claim 1, characterized in that The light source is an LED lamp.

3. The method according to claim 1, characterized in that The alkaline solution is a sodium hydroxide solution.

4. The method according to claim 1, characterized in that: The concentration of the alkaline solution is 0.1-1M.

5. The method according to claim 1, characterized in that The concentration of the potassium permanganate solution is 0.1-1M.

6. The method according to claim 1, characterized in that The stirring reaction speed is 500-650 r / min.

7. The method according to claim 1, characterized in that The stirring reaction time is 20 to 40 minutes.

8. The method according to claim 1, characterized in that The method for preparing potassium manganate solution further comprises a pH adjustment step; preferably, the pH value of the potassium manganate solution is 10-14.

9. A potassium manganate solution, characterized in that The potassium manganate solution is prepared by the method for preparing the potassium manganate solution according to any one of claims 1 to 8.

10. Use of the potassium manganate solution prepared by the method according to any one of claims 1 to 8 in laboratory research on water treatment technology.

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