Preparation method of high-value activated carbon material from waste colored cotton fabric

Abstract

The application belongs to the field of composite functional materials, and particularly relates to a preparation method of high-value activated carbon material of waste colored cotton fabric. The preparation method comprises the following steps: (1) performing dyeing treatment on raw cotton cloth with acid red 3BS to obtain colored cotton fabric; (2) performing activation treatment on the colored cotton fabric after dyeing by using KHCO3; (3) performing high-temperature carbonization on the activated colored cotton fabric, and then performing cleaning by using ethanol, HCL solution and ion water to obtain activated carbon material. The preparation method route is simple and easy to operate, the colored cotton fabric does not need to be subjected to decoloring treatment, the advantages of the colored cotton fabric are fully utilized, the waste colored cotton fabric is utilized in a high-value and decoloring-free manner, and the prepared activated carbon material can be widely applied in the fields of filtration, adsorption, electrochemistry and the like.

Description

Technical Field

[0001] This invention belongs to the field of composite functional materials, specifically relating to a method for preparing high-value activated carbon materials from waste colored cotton fabrics. Background Technology

[0002] With the rapid development of the textile industry, the consumption of textiles has been continuously increasing, resulting in a large amount of waste textiles. Waste textiles are mainly used as stuffing materials or directly landfilled or incinerated, which not only harms the environment but also represents a serious waste of resources. How to better recycle waste textiles and utilize them at a high value is an urgent problem for the textile industry. The presence of dyes and other additives in colored waste fabrics further increases the difficulty of recycling. Currently, the recycling of colored cotton fabrics often requires decolorization before secondary product production, which greatly increases the cost and difficulty of recycling. Therefore, it is necessary to develop a method for directly reusing colored cotton fabrics to achieve high-value recycling. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention adopts a method for preparing high-value activated carbon materials from waste colored cotton fabrics. The preparation method of the present invention is simple and controllable, does not require decolorization of the colored cotton fabrics, and does not require the addition of any catalysts. The prepared activated carbon material has a porous structure and a high specific surface area, and has great application potential in adsorption, filtration and photoelectric applications.

[0004] A method for preparing high-value activated carbon material from waste colored cotton fabrics includes the following steps:

[0005] (1) The original cotton fabric was dyed with acid red 3BS dye using the "one bath two stages" method, and then the colored cotton fabric was obtained after being boiled and dried in hot water at 95℃.

[0006] (2) Soak the dyed colored cotton fabric in KHCO3 aqueous solution and let it stand for 24 hours, then dry it at 50°C for later use.

[0007] (3) The activated colored cotton fabric is carbonized at high temperature and then washed with ethanol, HCl solution and deionized water to obtain porous activated carbon material.

[0008] In the dyeing process described in step (1), the liquor ratio is 1:20.

[0009] The “one bath, two stages” mentioned in step (1) is divided into: the dyeing stage and the color-fixing stage.

[0010] The temperatures and times for the “one bath, two stages” in step (1) are as follows: dyeing stage: 60℃ / 30mins; fixing stage: 60℃ / 45mins.

[0011] The dye mentioned in step (1) is Acid Red 3BS or other reactive dyes.

[0012] The concentration of the KHCO3 solution in step (2) is 0.05M.

[0013] The high-temperature carbonization process conditions described in step (3) are: heating rate of 2-10℃ / min, calcination temperature of 800℃, and processing time of 1h.

[0014] The high-temperature carbonization process conditions described in step (3) are as follows: in a N2 atmosphere, the temperature is increased to 800℃ at a rate of 5℃ / min and held for 1 hour.

[0015] The raw cotton fabric mentioned in step (1) is a pure cotton fabric or a polyester-cotton blend fabric.

[0016] The method for preparing high-value activated carbon material from waste colored cotton fabrics, as described in this invention, has the following advantages compared to existing technologies:

[0017] 1. This invention uses a one-step high-temperature calcination method to achieve high-value utilization of waste colored cotton. The operation is simple and controllable, and there is no need to decolorize the waste cotton or add any catalyst, which is conducive to further controllable production.

[0018] 2. The activated carbon material prepared by this invention has a high specific surface area, which is significantly higher than that of activated carbon material prepared from undyed raw cotton fabric, thus giving full play to the advantages of colored cotton.

[0019] 3. The activated carbon material prepared by the present invention using colored cotton raw materials achieves in-situ heteroatom doping of carbon materials by utilizing elements rich in dyes, giving it great application potential in catalysis and photoelectric applications.

[0020] The preparation method of this invention is simple and easy to operate. It not only eliminates the need for decolorization of colored cotton fabrics, but also makes full use of the advantages of colored cotton fabrics, realizing the decolorization-free and high-value utilization of waste colored cotton fabrics. The activated carbon material prepared by it can be widely used in filtration, adsorption, electrochemistry and other fields. Attached Figure Description

[0021] Figure 1 This is a scanning electron microscope image of the carbon material obtained in Example 1 of the present invention.

[0022] Figure 2 This is an EDS elemental distribution diagram of the carbon material obtained in Example 1 of the present invention.

[0023] Figure 3This is the N2 adsorption-desorption curve of the carbon material obtained in Example 1 of the present invention.

[0024] Figure 4 This is a scanning electron microscope image of the carbon material obtained in Comparative Example 1 of the present invention.

[0025] Figure 5 This is an EDS elemental distribution diagram of the carbon material obtained in Comparative Example 1 of the present invention.

[0026] Figure 6 This is the N2 adsorption-desorption curve of the carbon material obtained in Comparative Example 1 of the present invention.

[0027] Figure 7 This is a scanning electron microscope image of the carbon material obtained in Comparative Example 2 of the present invention.

[0028] Figure 8 This is the N2 adsorption-desorption curve of the carbon material obtained in Comparative Example 3 of the present invention.

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0030] Example 1

[0031] A method for preparing high-value activated carbon material from waste colored cotton fabrics includes the following steps:

[0032] (1) Weigh 0.1g of dye and 1g of sodium sulfate and dissolve them in 20mL of water. Raise the water temperature to 60℃, immerse 1g of cotton fabric in the solution, and dye for 30 minutes. Then add 0.4g of Na2CO3 to the solution and fix the color for 45 minutes. Then rinse with cold water. Next, put the fabric into 95℃ hot water and boil for 10 minutes. Then rinse with cold water and dry for later use.

[0033] (2) Prepare 200 mL of 0.05 M KHCO3 aqueous solution, then soak 5 g of the cloth obtained in step (1) in it, stir at room temperature for 24 h, and then dry at 50 °C for later use.

[0034] (3) The carbonized fabric was washed several times with ethanol, 1.0M HCl solution and deionized water, and then dried at 80°C to obtain porous activated carbon material.

[0035] Figure 1 The image shows a scanning electron microscope (SEM) image of the carbon material obtained in Example 1 of this invention. As shown, the prepared activated carbon material still has a complete fibrous structure, and the fabric maintains its basic morphological structure. Some fibers are broken, and the fiber surface has a groove structure, which is beneficial to increasing the specific surface area of ​​the prepared activated carbon material.

[0036] Figure 2 This is an EDS elemental distribution diagram of the carbon material obtained in Example 1 of the present invention. As shown in the figure, in addition to the basic carbon element, a large number of N and S elements are distributed on the fiber surface. This is mainly due to the in-situ doping of carbon fibers with N and S elements formed after the carbonization of a large number of sulfonic acid groups and amino functional groups in the dye Reactive Red 3BS, thus giving it a good application prospect in the fields of catalysis and electrochemistry.

[0037] Figure 3 This is the N2 adsorption-desorption curve of the carbon material obtained in Example 1 of the present invention. The specific surface area analysis results show that the prepared activated carbon material has a high specific surface area of ​​573.461 m². 2 / g and porosity.

[0038] Comparative Example 1

[0039] A method for preparing a high-value activated carbon material from waste raw cotton fabric includes the following steps:

[0040] (1) Prepare 200 mL of 0.05 M KHCO3 aqueous solution, then soak 5 g of raw cotton cloth in it, stir at room temperature for 24 h, and then dry at 50 °C for later use.

[0041] (2) The carbonized fabric was washed several times with ethanol, 1.0M HCl solution and deionized water, and then dried at 80°C to obtain porous activated carbon material.

[0042] Figure 4 This is a scanning electron microscope image of the carbon material obtained in Comparative Example 1 of this invention. As shown in the figure, the prepared activated carbon material still has a complete fibrous structure, but the breakage of the fabric fibers is more severe.

[0043] Figure 5 The figure shows the EDS elemental distribution of the carbon material obtained in Comparative Example 1 of this invention. As shown, the elements are mainly carbon, with nitrogen being present in very small amounts.

[0044] Figure 6 This is the N2 adsorption-desorption curve of the carbon material obtained in Comparative Example 1 of this invention. As shown in the figure, the specific surface area of ​​the activated carbon material prepared from the original cotton fabric is 253.726 m². 2 / g is significantly lower than that of the carbon material prepared from colored cotton fabric in Example 1 (573.461m). 2 / g).

[0045] Comparative Example 2

[0046] A method for preparing a high-value activated carbon material from waste raw cotton fabric includes the following steps:

[0047] (1) Weigh 0.1g of dye and 1g of sodium sulfate and dissolve them in 20mL of water. Raise the water temperature to 60℃, immerse 1g of polyester-cotton blended fabric in the solution, and dye for 30 minutes. Then add 0.4g of Na2CO3 to the solution and fix the color for 45 minutes. Then rinse with cold water. Next, put the fabric into hot water at 95℃ for 10 minutes, then rinse with cold water and dry for later use.

[0048] (2) Prepare 200 mL of 0.05 M KHCO3 aqueous solution, then soak 5 g of the cloth obtained in step (1) in it, stir at room temperature for 24 h, and then dry at 50 °C for later use.

[0049] (3) The carbonized fabric was washed several times with ethanol, 1.0M HCl solution and deionized water, and then dried at 80°C to obtain porous activated carbon material.

[0050] Figure 7 This is a scanning electron microscope image of the carbon material obtained in Comparative Example 2 of this invention. As shown in the figure, many particles appear on the surface of the prepared activated carbon material, which is due to the formation of polyester during high-temperature carbonization.

[0051] Figure 8 This is the N2 adsorption-desorption curve of the carbon material obtained in Comparative Example 2 of this invention. As shown in the figure, the specific surface area of ​​the activated carbon material prepared from colored polyester-cotton blended fabric is significantly lower than that of the carbon material prepared from colored cotton fabric.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for preparing high-value activated carbon material from waste colored cotton fabrics, characterized in that, Includes the following steps: (1) The original cotton fabric was dyed with reactive dyes using the "one bath, two stages" method. The "one bath, two stages" method consists of a dyeing stage and a fixing stage. The temperature and time of the "one bath, two stages" method are as follows: dyeing stage: 60 ℃ / 30 mins; fixing stage: 60 ℃ / 45 mins. The colored cotton fabric is then obtained after being boiled and dried in hot water at 95°C; the dye is Acid Red 3BS or other reactive dyes. (2) Soak the dyed colored cotton fabric in KHCO3 aqueous solution and let it stand for 24 hours, then dry it at 50 °C for later use; the concentration of the KHCO3 solution is 0.05 M; (3) The activated colored cotton fabric is carbonized at high temperature and then cleaned with ethanol, HCl solution and deionized water to obtain porous activated carbon material; the high temperature carbonization process conditions are: in N2 atmosphere, the temperature is increased to 800 ℃ at 5 ℃ / min and kept at the temperature for 1h.

2. The method for preparing high-value activated carbon material from waste colored cotton fabrics according to claim 1, characterized in that, In the dyeing process described in step (1), the liquor ratio is 1:

20.

3. The method for preparing high-value activated carbon material from waste colored cotton fabrics according to claim 1 is characterized in that, The raw cotton fabric mentioned in step (1) is a pure cotton fabric or a polyester-cotton blend fabric.

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