Lignin-based carbon material, preparation method thereof and application thereof in chromium adsorption

A technology of lignin-based and carbon materials, applied in the field of lignin-based carbon materials and their preparation, can solve the problems of high energy consumption, difficult to operate, difficult to realize industrialization, etc., and achieves low activation temperature, good adsorption effect and simple process. Effect

Pending Publication Date: 2019-11-22
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the use of lignin modification to prepare high-efficiency adsorption materials and its application in wastewater treatment has become a hot spot in the field of environmental governance. However, most modification methods have many steps, high energy consumption, and are not easy to operate, making it difficult to realize industrialization.

Method used

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  • Lignin-based carbon material, preparation method thereof and application thereof in chromium adsorption
  • Lignin-based carbon material, preparation method thereof and application thereof in chromium adsorption
  • Lignin-based carbon material, preparation method thereof and application thereof in chromium adsorption

Examples

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Embodiment 1

[0052] A preparation method for phosphoric acid-activated lignin-based carbon material (PA-CL), comprising the following steps:

[0053] Step 1, weigh 30g of dry lignin and place it in a 100mL reactor, add 90g of phosphoric acid (the impregnation ratio is 1:3) dropwise to the reactor at a rate of 60 drops / minute, stir evenly, then tighten the reactor, Put it in an oven at 140°C and react for 4 hours to obtain the reactant.

[0054] Step 2: Dry the reactant in an oven at 60°C for 5 hours, then put it into a crucible and put it in a muffle furnace, calcinate it at 400°C for 1 hour, wash it, and dry it again at 60°C for 5 hours to obtain phosphoric acid-activated lignin Carbon-based material (PA-CL), stored in a desiccator, for later use.

Embodiment 2

[0056] A preparation method of potassium hydroxide activated lignin-based carbon material (PH-CL), comprising the following steps:

[0057] Step 1, weigh 30g of lignin and put it in the reaction kettle, add 90g of potassium hydroxide solution with a mass fraction of 20%, make the impregnation ratio of the material 1:3, stir evenly, tighten the reaction kettle, and put it into an 80°C In the oven, react for 4h to obtain the reactant.

[0058] Step 2, slowly drop the reactant solution in the reactor into acidic water (pH value 2.0) twice the volume of the potassium hydroxide solution, so that the lignin precipitates out, and after filtering, put the precipitated lignin in an oven at 70°C Then put it into a crucible, place it in a muffle furnace at 800°C for 1h, wash it, and dry it at 65°C for 4h to obtain a potassium hydroxide (KOH)-activated lignin-based carbon material (PH-CL). Store in a desiccator for later use.

Embodiment 3

[0060] A preparation method for zinc chloride activated lignin-based carbon material, comprising the following steps:

[0061] Step 1, using ZnCl 2 Activation of industrial lignin, 30g lignin is placed in the reaction kettle, adding mass fraction is 40% ZnCl 2 Solution 90g, so that the material impregnation ratio is 1:3, after stirring evenly, place the reaction kettle in an oven at 120°C for 4 hours to react to obtain the reactant.

[0062] Step 2, drying the reactant at 70°C for 4h, calcining in a muffle furnace at 600°C for 1h, washing, and drying at 70°C for 4h to obtain ZnCl 2 The activated lignin-based carbon material (ZC-CL) was stored in a desiccator for future use.

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Abstract

The invention discloses a lignin-based carbon material, a preparation method thereof and an application thereof in chromium adsorption. The lignin-based carbon material comprises a phosphoric acid activated lignin-based carbon material, a potassium hydroxide activated lignin-based carbon material or a zinc chloride activated lignin-based carbon material. The lignin-based carbon material takes theindustrial residue corncob lignin as a raw material, by respectively activating the phosphoric acid, potassium hydroxide and zinc chloride, the lignin-based carbon material (PA-CL, PH-CL and ZC-CL) isprepared, and the obtained lignin-based carbon material is good in Cr (VI) adsorption effect and high in removal efficiency. Especially the lignin-based carbon material PA-CL has the better effect, the Cr adsorption capacity can reach 108.4 mg/g, and the removal rate can reach 54.2%. The preparation method is simple and environment-friendly, is low in activation temperature, and can realize the resource and high-value utilization of the industrial lignin.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a lignin-based carbon material, a preparation method thereof and an application in chromium adsorption. Background technique [0002] The vigorous development of chemical industry, electroplating, metallurgy and other industries has caused a large amount of heavy metals to enter the water body, resulting in serious water pollution. Due to the characteristics of non-degradability and high toxicity of heavy metals in nature, their migration and accumulation through the food chain will cause great harm to human health. Studies have shown that heavy metal chromium is widely used in leather, fuel, organic synthesis and other industries, among which hexavalent chromium Cr(VI) has strong toxicity and exists in different forms of ions according to the pH value of the system environment, such as HCrO 4 - , CrO 4 2- and Cr 2 o 7 2- Plasma. At present, the methods for removing he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/342C01B32/348C01B32/324B01J20/20B01J20/30C02F1/28C02F101/22
CPCB01J20/20C02F1/281C02F1/283C02F2101/22C01B32/324C01B32/342C01B32/348
Inventor 孙永昌刘肖南王婷婷吕欣田张冰清
Owner CHANGAN UNIV
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