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Modified lignite-based adsorption material as well as preparation method and application thereof

An adsorption material, lignite-based technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of limited adsorption capacity and limited adsorption capacity of adsorbents

Pending Publication Date: 2021-08-13
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although loading metal modification can overcome the defect that acid and alkali are easy to corrode the instrument, there is a defect that the adsorption amount is limited
For example, Chinese patent CN201910456747.0 discloses a printing and dyeing wastewater adsorbent and its preparation method. The printing and dyeing wastewater adsorbent needs to first acid-modify the coal powder, then use metal alumina to modify it, and then combine the acid-modified coal powder with The printing and dyeing wastewater adsorbent is obtained by modifying and mixing metal alumina, and the adsorption capacity of the adsorbent obtained by this method is limited (2.5mg / g)

Method used

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  • Modified lignite-based adsorption material as well as preparation method and application thereof
  • Modified lignite-based adsorption material as well as preparation method and application thereof
  • Modified lignite-based adsorption material as well as preparation method and application thereof

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preparation example Construction

[0030] The present invention also provides a preparation method of the modified lignite-based adsorption material described in the above technical solution, comprising the following steps:

[0031] (1) Lignite is mixed with hydrochloric acid to carry out acid leaching to obtain a demineralized coal sample;

[0032] (2) mixing the demineralized coal sample obtained in the step (1) with magnesium salt and deionized water, and impregnating to obtain a precursor;

[0033] (3) Roasting the precursor obtained in the step (2) to obtain a modified lignite-based adsorption material.

[0034] In the invention, the lignite is mixed with hydrochloric acid for acid leaching to obtain a demineralized coal sample. In the present invention, one or more of inherent metal elements Si, Al, Ca, Mg, Fe, K and Na are included in the lignite, and the acid leaching can remove impurity metal elements in the lignite, so that the acid leaching Only two metal elements, Si and Al, are left in the final ...

Embodiment 1

[0065] (1) Mix 100.0g lignite (hereinafter referred to as SL) with 1000mL 19wt% hydrochloric acid, stir at room temperature for 24h, carry out acid leaching, let stand for 4h, and wash with a large amount of deionized water until the pH of the filtrate is neutral and AgNO 3 No white precipitate formed. The filter cake was dried in a drying oven at 105°C for 6 h, ground and sieved to 200 mesh in a mortar to obtain a demineralized coal sample (SL + ); Wherein, the mass ratio of the volume of hydrochloric acid and SL is 10mL:1.0g.

[0066] (2) the 5.0g SL obtained in the step (1) + with MgCl 2 Mix with 75mL deionized water, stir at room temperature for 12h for impregnation, solid-liquid separation after impregnation, and then dry the obtained solid at 105°C to obtain the precursor; MgCl 2 Medium Mg 2+ The quality is SL + 2 wt% of the mass.

[0067] (3) Place the precursor obtained in the step (2) in a tube furnace, heat the sample to 300° C. at a heating rate of 5° C. / min, ...

Embodiment 2

[0088] The difference with Example 1 is that the MgCl in the step (2) 2 Medium Mg 2+ The quality is SL + The 2wt% of mass is changed into 4wt%, all the other steps are identical with embodiment 1, and the adsorbent material that obtains is named after SL + -4Mg.

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Abstract

The invention relates to the technical field of composite materials, and provides a modified lignite-based adsorption material and a preparation method and an application thereof. The modified lignite-based adsorption material comprises a demineralized coal sample and magnesium ions loaded on the demineralized coal sample, and the mass of the magnesium ions accounts for 2-6 wt% of the mass of the demineralized coal sample. According to the modified lignite-based adsorption material provided by the invention, a demineralized coal sample is modified by using magnesium ions, so that the modified lignite-based adsorption material can form more active sites for adsorbing organic dye, and the adsorption performance of the lignite-based adsorption material on the organic dye is further improved; by limiting the mass of the magnesium ions accounting for the mass of the demineralized coal sample, it can be guaranteed that the modified lignite-based adsorption material has sufficient adsorption sites, and the situation that the adsorption performance of the modified lignite-based adsorption material is reduced due to accumulation of excessive magnesium on the surface of the demineralized coal sample can be prevented. The result of the embodiment shows that the adsorption capacity of the modified lignite-based adsorption material provided by the invention can reach 95.56 mg / g.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a modified lignite-based adsorption material and its preparation method and application. Background technique [0002] When organic dyes are used in the printing and dyeing industry, they will produce wastewater containing methylene blue, methyl green, malachite green and basic fuchsin (large water volume, high chroma, and high concentration), which will cause serious pollution to water bodies. At present, physical, chemical and biological methods are often used to treat wastewater, so that wastewater can meet the requirements of protecting water quality and ecological environment. Among them, the adsorption method has the characteristics of simple operation, good treatment effect, and no introduction of other pollution sources, and has become the most widely used treatment method. [0003] Coal is one of the main raw materials for preparing adsorption materials. Aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/30C02F101/34C02F101/36C02F101/38
CPCB01J20/20C02F1/283C02F2101/308C02F2101/38C02F2101/34C02F2101/36
Inventor 李娜冯艳武磊刘全生
Owner INNER MONGOLIA UNIV OF TECH
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