Preparation method of tin hydroxide and application of tin hydroxide in methyl orange adsorption

Abstract

The invention discloses a preparation method of tin hydroxide and application of the tin hydroxide in methyl orange adsorption. The preparation method of the tin hydroxide comprises the following steps that S1, waste tin is dissolved in an acid solution, after standing reaction is completed, filtering is conducted, and a reaction solution is obtained; s2, an alkali solution is added into the reaction solution in the S1, the pH of the reaction solution is adjusted to be neutral, standing is conducted after stirring, and a tin hydroxide precipitate is obtained; and S3, centrifuging the tin hydroxide precipitate obtained in the step S2, and drying to obtain the tin hydroxide. According to the method, the waste tin is converted into the tin hydroxide through a chemical reaction, the tin hydroxide can be used for wastewater treatment and methyl orange adsorption, the cost can be reduced, pollution can be reduced, recycling of the waste tin is achieved, and the additional value is increased.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a preparation method of tin hydroxide and application of the tin hydroxide in methyl orange adsorption. Background Art

[0002] At present, waste tin can be recycled and reused through chemical methods. The chemical method mainly separates tin from waste tin through chemical reactions. The process is to first classify, shear, deoil, and clean the waste tin, then extract tin by chlorination or electrolysis, and then further treat the tin salt or tin ion to finally obtain pure metallic tin. However, this recycling method has problems such as high cost and complex operation. Therefore, it is urgent to develop a new method for recycling waste tin. Summary of the invention

[0003] Based on the technical problems existing in the background technology, the present invention proposes a preparation method of tin hydroxide and its application in methyl orange adsorption, and converts waste tin into tin hydroxide through chemical reaction, which can be used for wastewater treatment and adsorption of methyl orange, which can not only reduce costs and pollution, but also realize the recycling and reuse of waste tin and increase added value.

[0004] The preparation method of tin hydroxide proposed by the present invention comprises the following steps:

[0005] S1: dissolving the waste tin with an acid solution, standing the solution for complete reaction and filtering the solution;

[0006] S2: adding an alkaline solution to the reaction solution in S1, adjusting the pH of the reaction solution to neutral, stirring and then standing to obtain tin hydroxide precipitation;

[0007] S3: The tin hydroxide precipitate of S2 is centrifuged and dried to obtain tin hydroxide.

[0008] Preferably, the molar ratio of waste tin to acid in S1 is 1:3-5.

[0009] Preferably, the acid in S1 is nitric acid.

[0010] Preferably, the alkali in S2 is sodium hydroxide or potassium hydroxide with a concentration of 3-6 mol / L.

[0011] Preferably, the centrifugal speed in S3 is 3000-9000 r / min, and the centrifugal time is 60-120 s.

[0012] Preferably, the drying temperature in S3 is 45-55° C. and the drying time is 4-6 h.

[0013] The tin hydroxide prepared by the method proposed by the present invention.

[0014] The present invention provides the use of the tin hydroxide in the adsorption of methyl orange.

[0015] Beneficial technical effects of the present invention:

[0016] (1) The present invention converts waste tin into tin hydroxide through a chemical reaction, which can be used for the adsorption of methyl orange in wastewater treatment; the waste tin treatment method can not only reduce costs and pollution, but also realize the recycling and reuse of waste tin and increase added value.

[0017] (2) The tin hydroxide precipitate of the present invention is dried after centrifugation, and compared with direct drying, the adsorption removal rate of methyl orange is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the test result of methyl orange adsorption by tin hydroxide prepared in Example 1 of the present invention.

[0019] Figure 2 This is the test result of methyl orange adsorption by tin hydroxide prepared in Comparative Example 1 proposed by the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further explained below in conjunction with specific embodiments.

[0021] Example 1

[0022] The preparation method of tin hydroxide proposed by the present invention comprises the following steps:

[0023] (1) Weigh 12 g of waste tin and add it to a container containing nitric acid solution (10 mL of pure water and 20 mL of concentrated nitric acid, V / V = 1:2). Allow the reaction to stand overnight without stirring until the reaction is complete.

[0024] (2) The reaction solution in the container is separated into layers. Slowly pour off the upper clear liquid and transfer the lower suspension to another container. Remove the bottom residue and add 3-5 mL of pure water to rinse the inner wall of the container and the bottom residue. Then combine the obtained suspensions.

[0025] (3) The suspension is rapidly stirred, and then a 3 mol / L sodium hydroxide solution is slowly added dropwise to adjust the pH to 7. The mixture is stirred for 30 min and allowed to stand to obtain tin hydroxide precipitation.

[0026] (4) The tin hydroxide precipitate is separated by centrifuging at 3000 r / min, and then the tin hydroxide solid is dried in an electric constant temperature forced air drying oven at 50° C. for 6 h to obtain dry tin hydroxide.

[0027] 50 mg of tin hydroxide prepared in this example was added to 50 mL of methyl orange solution (50 mg / L) and stirred or shaken for 30 min. The test results are as follows: Figure 1 As shown in the figure, the adsorption removal rate of methyl orange in this scheme is 96.6% as calculated by absorbance.

[0028] Example 2

[0029] The step (3) of preparing tin hydroxide in this scheme is: stirring the suspension rapidly, then slowly adding 6 mol / L sodium hydroxide solution, adjusting the pH to 7, and continuing stirring for 30 minutes. The mixture is allowed to stand to obtain tin hydroxide precipitation.

[0030] The remaining conditions are the same as those in Example 1.

[0031] Example 3

[0032] The step (4) of preparing tin hydroxide in this scheme is: the tin hydroxide precipitate is separated by centrifuging at 9000 r / min, and then the tin hydroxide solid is dried in an electric constant temperature blast drying oven at 50° C. for 4 hours to obtain dry tin hydroxide.

[0033] The remaining conditions are the same as those in Example 1.

[0034] Comparative Example 1

[0035] The step (4) of preparing tin hydroxide in this scheme is: drying the tin hydroxide precipitate in an electric constant temperature forced air drying oven at 50° C. for 6 hours to obtain dry tin hydroxide.

[0036] The remaining conditions are the same as those in Example 1.

[0037] Add 50 mg of tin hydroxide prepared in this scheme into 50 mL of methyl orange solution (50 mg / L) and stir or shake for 30 minutes. The test results are as follows: Figure 2 As shown in the figure, the adsorption removal rate of methyl orange in this scheme was only 68.8% calculated by absorbance.

Claims

1. A method for preparing tin hydroxide, characterized in that: The steps are as follows: S1: dissolving the waste tin with an acid solution, standing the solution for complete reaction and filtering the solution; S2: adding an alkaline solution to the reaction solution in S1, adjusting the pH of the reaction solution to neutral, stirring and then allowing to stand to obtain tin hydroxide precipitation; S3: The tin hydroxide precipitate of S2 is centrifuged and dried to obtain tin hydroxide.

2. The method for preparing tin hydroxide according to claim 1, wherein The molar ratio of waste tin to acid in S1 is 1:3-5.

3. The method for preparing tin hydroxide according to claim 1, wherein The acid in S1 is nitric acid.

4. The method for preparing tin hydroxide according to claim 1, wherein The alkali in S2 is sodium hydroxide or potassium hydroxide with a concentration of 3-6 mol / L.

5. The method for preparing tin hydroxide according to claim 1, characterized in that The centrifugal speed in S3 is 3000-9000 r / min, and the centrifugal time is 60-120 s.

6. The method for preparing tin hydroxide according to claim 1, characterized in that: The drying temperature in S3 is 45-55°C and the drying time is 4-6h.

7. A tin hydroxide prepared by the method according to any one of claims 1 to 6.

8. Use of the tin hydroxide as claimed in claim 7 in methyl orange adsorption.

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