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Low-density self-forming graphite adsorption material as well as preparing and recycling method thereof

An adsorption material and self-forming technology, applied in chemical instruments and methods, separation methods, filter regeneration, etc., can solve problems such as poor regeneration performance, reduced adsorption performance, and difficult operation of expanded graphite particles, and achieve simple regeneration and recycling , the effect of avoiding environmental pollution problems

Active Publication Date: 2019-05-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the above-mentioned prior art and solve the problem that expanded graphite particles are not easy to operate in the application process of adsorbing oil and high molecular organic matter, such as the use of mechanical extrusion molding, resulting in reduced adsorption performance and poor regeneration performance

Method used

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  • Low-density self-forming graphite adsorption material as well as preparing and recycling method thereof
  • Low-density self-forming graphite adsorption material as well as preparing and recycling method thereof
  • Low-density self-forming graphite adsorption material as well as preparing and recycling method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add natural flake graphite (50 mesh) and concentrated sulfuric acid (98%) into the reaction kettle according to the ratio of graphite (kg): concentrated sulfuric acid (L) = 1:10, the ambient temperature is 8°C, stir well and press hydrogen peroxide (L) : The ratio of concentrated sulfuric acid (L)=1:5 was slowly added to hydrogen peroxide (30%), and after stirring for 5 minutes, a uniformly mixed reactant was obtained.

[0027] Transfer 1000 g of the homogeneously mixed reactants prepared according to the above proportions to a cuboid container (5cm×5cm×20cm), and let it stand at room temperature for 3 hours to obtain a self-forming expanded graphite molded body. The obtained expanded graphite molded body was dried in a drying oven at 350° C. for 1 hour, and the sulfur content of the treated expanded graphite was measured to be 0.04%. The expanded graphite molded body after drying is taken out, and its density is 0.1g / cm 3 .

Embodiment 2

[0029] Transfer 15 g of the homogeneously mixed reactants prepared according to the ratio of Example 1 to a spherical container (5 cm in diameter), and let stand at room temperature for 3 hours to obtain a self-forming expanded graphite molded body. The expanded graphite molded body was dried in a drying kiln at 380° C. for 1 hour, and the sulfur content of the treated expanded graphite was measured to be 0.02%. The expanded graphite molded body after drying is taken out, and its density is 0.01g / cm 3 .

Embodiment 3

[0031] Transfer 40 g of the homogeneously mixed reactants prepared according to the ratio of Example 1 to a cylindrical container (inner diameter 5 cm, height 20 cm), and place it at room temperature for 4 h to obtain a self-forming expanded graphite molded body. The expanded graphite molded body was dried in a drying kiln at 380° C. for 1 hour, and the sulfur content of the treated expanded graphite was measured to be 0.02%. The expanded graphite molded body after drying is taken out, and its density is 0.005g / cm 3 .

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Abstract

The invention discloses a low-density self-forming graphite adsorption material for treating oil and polymer organic matter pollution of a water body and a preparing and recycling method of the low-density self-forming graphite adsorption material. The preparing and recycling method comprises the following preparation steps: firstly, uniformly stirring flake graphite, concentrated sulphuric acid and a hydrogen peroxide mixture in an environment of smaller than or equal to 10 DEG C; secondly, transferring the obtained mixture to a die with a specific shape, and standing at room temperature to obtain an expanded graphite forming body; thirdly, baking the expanded graphite forming body and recycling sulfuric acid. The graphite adsorption material prepared by the invention has the characteristic of self forming under the condition of room temperature without addition of a binder or extrusion and has very high adsorption performance for oil and organic solvents; the density of the adsorption material is smaller than or equal to 0.1 g / cm<3>. According to the preparing and recycling method disclosed by the invention, the sulfuric acid is recycled at low temperature while an expanded graphite adsorption material is prepared; the problem of environmental pollution caused by treatment of acid-containing wastewater in a traditional method of preparing expanded graphite is avoided. The adsorbed oil and organic solvents have excellent regenerating and reusing properties after extrusion or suction filter recovery.

Description

technical field [0001] The invention belongs to the technical field of material preparation and application, and relates to the preparation of graphite materials, in particular to a low-density self-forming graphite adsorption material and its preparation and recycling method. Background technique [0002] With the rapid development of the economy, the pollution of oil products and high molecular organic substances in water bodies caused by oil exploitation and water transportation is becoming more and more serious. At present, the removal of oil products and high molecular organic substances in water at home and abroad is combined with mechanical salvage and adsorption. The adsorption material has the following problems: poor selectivity, adsorption of water while adsorbing oil and organic solvents, resulting in a decrease in adsorption capacity; poor recycling performance, and high cost of use. As a carbon material, expanded graphite has high hydrophobicity, high selectivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01J20/34C02F1/28C02F1/40C02F101/30
Inventor 黄正宏侯诗宇沈万慈康飞宇
Owner TSINGHUA UNIV
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