Efficient methyl orange removal dye adsorbent and preparation method thereof
By impregnating the methanol magnesium solution on the phosphorus-modified alumina and baking it to prepare an efficient methyl orange dye adsorbent, the cost of existing adsorbents is solved, and efficient and low-cost adsorption effect and multiple recycling are achieved.
Patent Information
- Application Number
- CN202510654920.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-21
- Publication Date
- 2025-07-22
AI Technical Summary
When treating water contaminated by methyl orange dye, existing adsorbents have problems of large amounts and high cost, and it is difficult to achieve efficient and low-cost adsorption effects.
Using phosphorus modified alumina as a carrier, the high-efficiency methyl orange dye adsorbent is prepared by adding magnesium methanol solution to immerse and calcination, and the adsorption is made using its large specific surface area and rich pore structure for adsorption. After adsorption, it is regenerated at high temperature for recycling.
The prepared adsorbent has high adsorption capacity and good thermal stability. It can be recycled multiple times, with an adsorption amount of 2924.2 mg·g-1, which is low in cost and has a significantly better adsorption effect than traditional methods.
Smart Images
Figure CN120346777A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of environmental protection, and particularly relates to a high-efficiency methyl orange dye adsorbent and a preparation method thereof. Background Art
[0002] As an anionic azo dye, methyl orange is widely used in industries such as printing and dyeing. However, it has strong light stability and is difficult to degrade naturally. Once it enters the water body, it will interfere with the photosynthesis of aquatic plants and damage the aquatic ecosystem. If ingested by the human body, it may also induce human gene mutations and carcinogenesis, and is considered to be one of the most harmful pollutants to water resources.
[0003] Currently, the adsorption method is commonly used to treat dye-polluted water bodies. This method is simple to operate, requires less equipment investment, and the adsorbent is simple to prepare. However, the adsorption method has problems such as a large amount of adsorbent used and high costs. Therefore, preparing a new type of adsorbent with excellent adsorption performance and low price is an urgent problem to be solved at present. Summary of the Invention
[0004] In order to overcome the disadvantages and deficiencies in the prior art, the present invention provides a preparation method and application of a simple, efficient and recyclable methyl orange dye adsorbent, which solves the problem of high use cost of existing adsorbents.
[0005] The preparation method of the high-efficiency methyl orange dye adsorbent is as follows: using phosphorus-modified alumina as a carrier, dropping a magnesium methoxide solution for impregnation to make the magnesium methoxide and the alumina carrier evenly mixed; then calcining at 400 - 600 °C for 2 - 4 h to completely convert the magnesium methoxide into magnesium oxide and evenly disperse it on the surface of the alumina, thus obtaining the high-efficiency methyl orange dye adsorbent.
[0006] The specific surface area of the phosphorus-modified alumina is 400 - 600 m 2 / g, the pore volume is 3.0 - 4.0 cm 3 / g, and the molar ratio of phosphorus to aluminum in it is 0.05 - 0.3.
[0007] The mass fraction of the magnesium methoxide solution is 5 - 7.5%, the solute is Mg 2+ , and the solvent is methanol.
[0008] The mass ratio of the magnesium methoxide solution to the phosphorus-modified alumina is 0.3 - 1.8.
[0009] The specific surface area of the high-efficiency methyl orange dye adsorbent is 150 - 350 m 2 / g, and the pore volume is 1.00 - 2.50 cm 3 / g.
[0010] The efficient methyl orange dye adsorbent after adsorbing methyl orange is calcined at 500 - 600 °C for 2 - 3 h, and then regenerated and can be used continuously to adsorb and remove methyl orange dye.
[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) Good adsorption effect: The adsorbent prepared in the present invention has a large specific surface area and a rich pore structure, and has a unique adsorption effect on the water body containing methyl orange dye. It binds to methyl orange molecules in the form of ion exchange, and the adsorption capacity can reach 2924.2 mg·g -1 .
[0012] (2) Low production cost: The raw materials used in the present invention are inexpensive, the preparation method is simple, and the preparation period of the adsorbent is only 6 - 8 h.
[0013] (3) Recyclable: The adsorbent of the present invention uses high - thermal - stability alumina as the carrier, which is conducive to recycling. When adsorbing the water body containing methyl orange dye, after five adsorption - desorption cycles, the adsorption amount can still reach more than 2100 mg·g -1 , which is 75% of the initial adsorption amount. Brief Description of the Drawings
[0014] Figure 1 is the SEM image of the efficient methyl orange dye adsorbent prepared in Example 1.
[0015] Figure 2 is the graph of the adsorption amount of the efficient methyl orange dye adsorbent prepared in Example 1 varying with the impregnation amount of magnesium oxide.
[0016] Figure 3 is the graph of the adsorption amount of the efficient methyl orange dye adsorbent prepared in Example 1 varying with the number of regeneration times. Detailed Description of the Invention
[0017] The present invention will be described in detail below so that those skilled in the art can implement it with reference to the description. Example
[0018] Using phosphorus - modified alumina as the carrier, the specific surface area of the phosphorus - modified alumina is 543.9 m 2 / g, the pore volume is 3.16 cm 3 / g, and the molar ratio of phosphorus to aluminum in it is 0.227. Weigh 12.6 g of a 7.5% methanol magnesium solution as the impregnation solution, and weigh 1 g of phosphorus - modified alumina as the carrier for impregnation. Drop and stir simultaneously until completely mixed evenly. Then calcine at 400 °C for 2 h to obtain the methyl orange dye adsorbent.
[0019] Weigh 0.1 g of the above-prepared methyl orange dye adsorbent, add it to 100 mL of methyl orange solution with a concentration of 400 mg / L, stir at room temperature for 300 min to reach the adsorption equilibrium, and the adsorption capacity is 2924.2 mg / g. Then, filter and separate to obtain the high-efficiency methyl orange dye adsorbent adsorbed with methyl orange dye. Place the adsorbent adsorbed with methyl orange dye in a muffle furnace at 600 °C and calcine for 3 h to decompose the dye for continued use. After repeating the above adsorption-regeneration operation 5 times, the adsorption amount of the adsorbent for methyl orange dye is 2275.9 mg / g, still having a relatively high adsorption amount.
[0020] Example 2 Using phosphorus-modified alumina as the carrier, the specific surface area of the phosphorus-modified alumina is 635.5 m 2 / g, the pore volume is 3.53 cm 3 / g, and the molar ratio of phosphorus to aluminum in it is 0.087. Weigh 10.8 g of a 7.5% magnesium methoxide solution as the impregnation solution, weigh 1 g of phosphorus-modified alumina as the carrier for impregnation, and add the solution dropwise while stirring until completely and evenly mixed. Then, calcine at 400 °C for 2 h to obtain the methyl orange dye adsorbent.
[0021] Weigh 0.1 g of the above-prepared methyl orange dye adsorbent, add it to 100 mL of methyl orange solution with a concentration of 400 mg / L, stir at room temperature for 360 min to reach the adsorption equilibrium, and the adsorption capacity is 2855.7 mg / g. Then, filter and separate to obtain the high-efficiency methyl orange dye adsorbent adsorbed with methyl orange dye. Place the adsorbent adsorbed with methyl orange dye in a muffle furnace at 600 °C and calcine for 2.5 h to decompose the dye for continued use. After repeating the above adsorption-regeneration operation 5 times, the adsorption amount of the adsorbent for methyl orange dye is 2147.8 mg / g, still having a relatively high adsorption amount. Example
[0022] Weigh 0.1 g of the methyl orange dye adsorbent prepared in Example 1, add it to 100 mL of methyl orange solution with an initial pH of 5 and a concentration of 400 mg / L, stir at room temperature for 300 min to reach the adsorption equilibrium, and the adsorption capacity is 3032.6 mg / g.
[0023] Comparative Example 1 Directly use the phosphorus-modified alumina in Example 1 as the adsorbent: Weigh 0.1 g of phosphorus-modified alumina, add it to 100 mL of methyl orange solution with a concentration of 400 mg / L, stir at room temperature for 120 min to reach the adsorption equilibrium, and the adsorption capacity is 24.1 mg / g. It can be seen that the impregnated magnesium methoxide significantly improves the adsorption effect of the adsorbent on methyl orange dye.
Claims
1. A preparation method of an adsorbent for efficiently removing methyl orange dye, characterized in that, The specific operation of the preparation method is as follows: Using phosphorus-modified alumina as the carrier, dropwise add a magnesium methoxide solution for impregnation to make the magnesium methoxide and the alumina carrier evenly mixed; then calcine at 400 - 600 °C for 2 - 4 h to completely convert the magnesium methoxide into magnesium oxide and uniformly disperse it on the surface of the alumina, thus obtaining an adsorbent for highly efficient removal of methyl orange dye.
2. The preparation method according to claim 1, characterized in that, The specific surface area of the phosphorus-modified alumina is 400-600 m 2 / g, the pore volume is 3.0-4.0 cm 3 / g, and the molar ratio of phosphorus to aluminum therein is 0.05-0.
3.
3. The preparation method according to claim 1, wherein, The mass fraction of the described magnesium methoxide solution is 5 - 7.5%, the solute is Mg 2+ , and the solvent is methanol.
4. The preparation method according to claim 1, characterized in that, The mass ratio of the magnesium methoxide solution to the phosphorus-modified alumina is 0.3 - 1.
8.
5. The preparation method according to claim 1, wherein The specific surface area of the described high-efficiency methyl orange dye adsorbent is 150 - 350 m 2 / g, and the pore volume is 1.00 - 2.50 cm 3 / g.
6. The preparation method according to claim 1, characterized in that, After the adsorbent for highly efficient removal of methyl orange dye adsorbs methyl orange, calcine it at 500 - 600 °C for 2 - 3 h, and then it can be regenerated and continue to be used for adsorbing and removing methyl orange dye.