Preparation method of adsorbing material for sulfuric acid decolorization, and prepared material and application

Abstract

The application discloses a preparation method of an adsorbing material for sulfuric acid decolorization, the material and application, and relates to the following steps: firstly, putting a pomelo peel into a pulverizer to obtain pomelo peel powder, and then mixing the pomelo peel powder with a sodium hydroxide solution to obtain pomelo peel cellulose; then, mixing the pomelo peel cellulose with bentonite at a mass ratio of 1:0.8-1.2, adding a crosslinking agent, stirring, and then performing ultrasonic dispersion in an ultrasonic cleaner to obtain a gelatinous substance; finally, cutting the gelatinous substance into particles, and drying the particles to obtain a pomelo peel bentonite-based adsorbing material. The adsorbing material obtained by the method has good adsorbing performance, high sulfuric acid decolorization capacity, and large particle size, and is easy to recover.

Description

Technical Field

[0001] The present invention relates to the preparation of adsorbent materials, specifically to a method for preparing an adsorbent material for sulfuric acid decolorization, the prepared material, and its application in the field of sulfuric acid decolorization. Background Technology

[0002] Sulfuric acid is an important chemical raw material used in the manufacture of pharmaceuticals, fertilizers, pigments, and detergents. It is also widely used in petroleum purification, metal smelting, and the dye industry. Currently, industrially produced sulfuric acid is often brown or even dark brown due to the presence of carbon black impurities. This significant color difference compared to pure sulfuric acid severely impacts its quality and price.

[0003] A relatively safe and efficient method to improve the color of sulfuric acid is to use adsorbents for decolorization, with activated carbon and diatomaceous earth being commonly used adsorbents. Bentonite also has adsorption properties, but its use for decolorizing industrial sulfuric acid has not been reported. However, experiments show that when using bentonite to decolorize sulfuric acid, the decolorization time is relatively long, and due to the small particle size of bentonite, the centrifugation time is also long, affecting the quality of the sulfuric acid product. Overall, bentonite still has some drawbacks in decolorizing industrial sulfuric acid. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing an adsorbent material for sulfuric acid decolorization. The adsorbent material obtained by this method has good adsorption performance, strong decolorization ability for sulfuric acid, and large particle size, making it easy to recover.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A method for preparing an adsorbent material for sulfuric acid decolorization includes the following steps:

[0007] Step S1: Put the grapefruit peel into a grinder and grind it. Pass it through a 60-mesh sieve to obtain grapefruit peel powder. Then mix it with sodium hydroxide solution. The mass ratio of grapefruit peel powder to sodium hydroxide solution is 10g:8-12mL. React at a constant temperature of 90℃ for 2 hours. Dry it to obtain grapefruit peel cellulose.

[0008] Step S2: Mix grapefruit peel cellulose and bentonite at a mass ratio of 1:0.8-1.2, add crosslinking agent, stir, and then ultrasonically disperse in an ultrasonic cleaner at 65-75℃ to obtain a gel-like substance;

[0009] Step S3: Cut the gel into granules and dry them to obtain grapefruit peel bentonite-based adsorbent material.

[0010] Preferably, in step S2, the crosslinking agent used is an acrylic resin crosslinking agent.

[0011] Preferably, in step S3, the drying temperature is 60-70℃.

[0012] Preferably, in step S1, the concentration of the sodium hydroxide solution used is 3-5 mol / L.

[0013] Preferably, in step S2, the mass ratio of grapefruit peel cellulose to crosslinking agent is 1:0.7-1.

[0014] Another object of the present invention is to provide an adsorbent material for sulfuric acid decolorization prepared by the above method and its application in the field of sulfuric acid decolorization.

[0015] The beneficial effects of this invention lie in introducing cellulose from grapefruit peel into the three-dimensional unit grid structure of bentonite, thus diversifying the grid, enhancing its stability, improving adsorption performance, and increasing particle size, making it easier to recycle. This method is simple to operate and easy to implement. Based on fully utilizing the adsorption capacity of bentonite, it further improves adsorption performance and particle size through structural adjustments, resulting in good decolorization of sulfuric acid and easy separation from sulfuric acid. Attached Figure Description

[0016] Figure 1 This is a scanning electron microscope image of a grapefruit peel bentonite-based adsorbent material.

[0017] Figure 2 This is a picture showing the decolorization effect of 0.6g of grapefruit peel bentonite-based adsorbent for 2 hours;

[0018] Figure 3 This is a decolorization effect image of 0.4g grapefruit peel bentonite-based adsorbent after 3 hours;

[0019] Figure 4 These are images showing the decolorization effect of different amounts of bentonite after 8 hours. Detailed Implementation

[0020] Example 1: Preparation of adsorbent material for decolorization of grapefruit peel using bentonite-based sulfuric acid.

[0021] Step S1: Grind the dried grapefruit peel in a grinder and pass it through a 60-mesh sieve to obtain grapefruit peel powder. Add 10g of grapefruit peel powder to a beaker, then add 10mL of 4.0mol / L sodium hydroxide solution, and react at a constant temperature of 90℃ for 2 hours. Filter and dry the filtrate to obtain grapefruit peel cellulose.

[0022] Step S2: Mix 5g of grapefruit peel cellulose with 5g of bentonite of equal mass, add 4g of acrylic resin crosslinking agent, stir and then ultrasonically disperse in an ultrasonic cleaner at 70℃ to obtain a gel.

[0023] Step S3: The obtained gel-like substance is cut into granules and dried at 70°C to obtain an adsorbent material for decolorizing grapefruit peel with bentonite-based sulfuric acid.

[0024] The obtained grapefruit peel was decolorized with bentonite-based sulfuric acid and analyzed by scanning electron microscopy using an adsorption material. The results are as follows: Figure 1 As shown, the surface structure of the grapefruit peel bentonite-based adsorbent is uneven, exhibiting many irregular bumps, wrinkles, pores, and cracks, thus possessing strong adsorption capacity. When the adsorbent comes into contact with sulfuric acid, the irregular bumpy surface increases the contact area, allowing impurities to be retained in the decolorizing agent, thereby achieving the purpose of decolorization. Simultaneously, the intact gel-like adsorbent particles facilitate rapid removal of the adsorbent by centrifugation after decolorization.

[0025] Example 2: Preparation of grapefruit peel bentonite-based adsorbent material

[0026] Step S1: Grind the dried grapefruit peel in a grinder and pass it through a 60-mesh sieve to obtain grapefruit peel powder. Add 10g of grapefruit peel powder to a beaker, then add 12mL of 3.0mol / L sodium hydroxide solution, and react at a constant temperature of 90℃ for 2 hours. Filter and dry the filtrate to obtain grapefruit peel cellulose.

[0027] Step S2: Mix 5g of grapefruit peel cellulose with 4g of bentonite in equal mass, add 3.5g of acrylic resin crosslinking agent, stir, and then ultrasonically disperse in an ultrasonic cleaner at 65℃ to obtain a gel.

[0028] Step S3: The obtained gel-like substance is cut into particles and dried at 60°C to obtain grapefruit peel bentonite-based adsorbent material.

[0029] Example 3: Preparation of grapefruit peel bentonite-based adsorbent material

[0030] Step S1: Grind the dried grapefruit peel in a grinder and pass it through a 60-mesh sieve to obtain grapefruit peel powder. Add 10g of grapefruit peel powder to a beaker, then add 8mL of 5.0mol / L sodium hydroxide solution, react at 90℃ for 2 hours, filter, and dry the filtrate to obtain grapefruit peel cellulose.

[0031] Step S2: Mix 5g of grapefruit peel cellulose with 6g of bentonite of equal mass, add 5g of acrylic resin crosslinking agent, stir and then ultrasonically disperse in an ultrasonic cleaner at 75℃ to obtain a gel.

[0032] Step S3: The obtained gel-like substance is cut into particles and dried at 65°C to obtain grapefruit peel bentonite-based adsorbent material.

[0033] The morphology and particle characteristics of the adsorbents obtained in Examples 2 and 3 are basically the same as those in Example 1.

[0034] Example 4: Decolorization effect of grapefruit peel bentonite-based adsorbent on sulfuric acid (test 1)

[0035] At room temperature, 10 mL of sulfuric acid sample and 0.6 g of grapefruit peel bentonite-based adsorbent prepared in Example 1 were added to a beaker, stirred evenly, and allowed to stand for 2 hours before centrifugation. The supernatant after centrifugation was poured into colorimetric tube number 2 for colorimetric comparison. The experimental results are as follows: Figure 2 As shown, number 1 is a blank sample, and number 3 is a standard color solution prepared according to the national standard GB / T 534-2014 "Industrial Sulfuric Acid". It can be clearly seen that the color of the decolorized sulfuric acid sample is no deeper than the color of the standard solution specified by the national standard.

[0036] Example 5: Decolorization effect of grapefruit peel bentonite-based adsorbent on sulfuric acid (test 2)

[0037] At room temperature, 10 mL of sulfuric acid sample and 0.4 g of grapefruit peel bentonite-based adsorbent prepared in Example 2 were added to a beaker, stirred evenly, and allowed to stand for 3 hours before centrifugation. The supernatant after centrifugation was poured into colorimetric tube numbered 5 for colorimetric comparison. The experimental results are as follows: Figure 3 As shown, number 1 is a blank sample, and number 7 is a standard color solution prepared according to the national standard GB / T 534-2014 "Industrial Sulfuric Acid". It can be clearly seen that the color of the decolorized sulfuric acid sample is no deeper than the color of the standard solution specified by the national standard.

[0038] Comparative Example 1

[0039] At room temperature, 10 mL of sulfuric acid sample and a certain amount of bentonite adsorbent were added to a beaker, stirred thoroughly, and allowed to stand for 8 hours before centrifugation. The supernatant was then poured into a colorimetric tube for colorimetric comparison. The experimental results are as follows: Figure 4 As shown, sample 1 is a blank sample, sample 5 is a standard color solution prepared according to the national standard GB / T534-2014 "Industrial Sulfuric Acid", and samples 2-4 correspond to bentonite dosages of 0.3g, 0.6g, and 1.2g, respectively. It can be seen that the greater the amount of bentonite, the better the decolorization effect of sulfuric acid. However, the decolorization effect of 0.6g bentonite for 8 hours is significantly less than that of 0.6g grapefruit peel bentonite adsorbent for 2 hours.

[0040] The above embodiments are merely illustrative of the concept and implementation of the present invention and are not intended to limit it. Under the concept of the present invention, technical solutions without substantial changes are still within the scope of protection.

Claims

1. An application of an adsorbent material for sulfuric acid decolorization, characterized in that, The application is for decolorizing industrial sulfuric acid, wherein the adsorbent material for sulfuric acid decolorization is prepared by a method comprising the following steps: Step S1: Put the grapefruit peel into a grinder and grind it. Pass it through a 60-mesh sieve to obtain grapefruit peel powder. Then mix it with sodium hydroxide solution. The mass ratio of grapefruit peel powder to sodium hydroxide solution is 10g:8-12mL. React at a constant temperature of 90℃ for 2 hours. Dry it to obtain grapefruit peel cellulose. Step S2: Mix grapefruit peel cellulose and bentonite at a mass ratio of 1:0.8-1.2, add crosslinking agent, stir, and then ultrasonically disperse in an ultrasonic cleaner at 65-75℃ to obtain a gel-like substance; Step S3: Cut the gel into granules and dry them to obtain an adsorbent material for decolorizing grapefruit peel with bentonite-based sulfuric acid.

2. The application as described in claim 1, characterized in that, In step S2, the crosslinking agent used is an acrylic resin crosslinking agent.

3. The application as described in claim 1, characterized in that, In step S3, the drying temperature is 60-70℃.

4. The application as described in claim 1, characterized in that, In step S1, the concentration of the sodium hydroxide solution used is 3-5 mol / L.

5. The application as described in claim 2, characterized in that, In step S2, the mass ratio of grapefruit peel cellulose to crosslinking agent is 1:0.7-1.

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