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Preparation of expanded graphite through compound modification and application of expanded graphite to printing and dyeing wastewater treatment

A technology of expanded graphite and composite modification, applied in the direction of adsorption water/sewage treatment, other chemical processes, chemical instruments and methods, etc., to achieve the effect of improving adsorption capacity, increasing pore volume, and increasing surface activity

Inactive Publication Date: 2015-09-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the first time, Chen Zhigang, Sun Lili and others modified expanded graphite with ammonia water as a modifier and used it for the adsorption of formaldehyde gas. Chen Zhigang and others used CTAB as a modifier to treat the surface of expanded graphite for the adsorption of formaldehyde. , and using CTAB-KBr as a modifier, using a low-temperature electric furnace as an expansion device to modify expanded graphite and apply it to the treatment of printing and dyeing wastewater has not been reported.

Method used

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  • Preparation of expanded graphite through compound modification and application of expanded graphite to printing and dyeing wastewater treatment
  • Preparation of expanded graphite through compound modification and application of expanded graphite to printing and dyeing wastewater treatment
  • Preparation of expanded graphite through compound modification and application of expanded graphite to printing and dyeing wastewater treatment

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Embodiment example 1

[0015] A certain amount of expandable graphite prepared from natural flake graphite is soaked in the ethanol solution of CTAB-KBr at a certain temperature, washed with water, dried, and expanded to obtain modified expanded graphite. Among them, CTAB and KBr The concentrations are 0.02mol / L and 0.05mol / L respectively, the ratio of expandable graphite to the solution is 1:0.2, the immersion temperature is 30°C, the immersion time is 5h, and the expansion equipment is a muffle furnace. The prepared modified expanded graphite was subjected to adsorption treatment of acid brilliant blue, acid scarlet, methylene blue and printing and dyeing wastewater at 30°C, and the maximum adsorption capacity was 219mg / g, 192mg / g, 181mg / g, 201mg / g, The time required to reach adsorption equilibrium is 150 min, 160 min, 180 min, 150 min.

Embodiment example 2

[0017] A certain amount of expandable graphite prepared from natural flake graphite is soaked in the ethanol solution of CTAB-KBr at a certain temperature, washed with water, dried, and expanded to obtain modified expanded graphite. Among them, CTAB and KBr The concentrations are 0.08mol / L and 0.2mol / L respectively, the ratio of expandable graphite to the solution is 1:0.2, the soaking temperature is 80°C and the soaking time is 8h, and the expansion equipment is a low-temperature electric furnace. The prepared modified expanded graphite is adsorbed on acid brilliant blue, acid scarlet, methylene blue and printing and dyeing wastewater at 30°C. The maximum adsorption capacity is 307mg / g, 279mg / g, 332mg / g, 321mg / g, reaching The time required for adsorption equilibrium was 180 min, 200 min, 180 min, and 180 min, respectively.

Embodiment example 3

[0019] A certain amount of expandable graphite prepared from natural flake graphite is soaked in an aqueous solution of CTAB-KBr at a certain temperature, washed with water, dried, and expanded to obtain modified expanded graphite, wherein the concentration of CTAB and KBr 0.08mol / L and 0.1mol / L respectively, the ratio of expandable graphite to solution is 1:0.2, the soaking temperature is 60°C and the soaking time is 5h, and the expansion equipment is a low-temperature electric furnace. The prepared modified expanded graphite is adsorbed on acid brilliant blue, acid scarlet, methylene blue and printing and dyeing wastewater under the condition of 30°C. The adsorption equilibrium time was 25 min, 30 min, 40 min, 45 min, respectively.

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Abstract

The invention relates to the field of preparation and application of modified expanded graphite, in particular to a method for preparing expanded graphite through CTAB-KBr compound modification and low-temperature electric furnace puffing. The method is characterized by including the following steps: soaking a certain amount of expandable graphite, which is prepared using natural flake graphite as a raw material, in a CTAB-KBr mixed solution with different concentrations of CTAB and KBr at a certain temperature; washing and drying, and then puffing using a low-temperature electric furnace to obtain modified expanded graphite. As the common low-temperature electric furnace is used to replace a muffle furnace as the puffing device, the expansion temperature is low, and energy conservation is remarkable; the expanded graphite after compound modification is increased in surface active sites, and rich surface functional groups are loaded on the surface, so that various types of dyes can be effectively adsorbed, and purification of printing and dyeing wastewater is realized.

Description

technical field [0001] The invention relates to a preparation method of composite modified expanded graphite and its application field, in particular to a method for preparing expanded graphite through CTAB-KBr composite modification and expansion in a low-temperature electric furnace and its application in the treatment of printing and dyeing wastewater. Background technique [0002] Expanded graphite is a cheap and versatile material, widely used in the fields of sealing, conductivity, adsorption, catalysis and medical materials, especially in the treatment of waste liquid, waste gas and oily wastewater. [0003] Synthetic dyes are widely used in industries such as textiles, pigments, paper, plastics, cosmetics, and food. Therefore, the annual discharge of dye wastewater in the world accounts for about 20% of the total industrial wastewater, and direct discharge will pose a serious threat to the ecological environment and human health. . Since most of the raw materials pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28
Inventor 林爱军王会丽焦春磊范鹏浩孙杨雨徐从斌
Owner BEIJING UNIV OF CHEM TECH
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