Method for preparing active carbon with high acid group content by mixing excess sludge and corn cobs

A technology of excess sludge and acidic groups, applied in the field of activated carbon, can solve the problems of underdeveloped pore structure, low specific surface area and high ash content, and achieve the effect of strong cation exchange, strong hydrophilicity and lower raw material cost.

Inactive Publication Date: 2010-07-07
BEIJING FORESTRY UNIVERSITY
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  • Summary
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  • Description
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  • Application Information

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Problems solved by technology

In recent years, although there have been many studies on the use of sludge to prepare activated carbon, due to the characteristics of low carbon content and high ash content of sludge, most of the prepared sludge activated carbon has low specific surface area, underdeveloped pore structure, and poor adsorption performance. Ideal, limits its application

Method used

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  • Method for preparing active carbon with high acid group content by mixing excess sludge and corn cobs
  • Method for preparing active carbon with high acid group content by mixing excess sludge and corn cobs
  • Method for preparing active carbon with high acid group content by mixing excess sludge and corn cobs

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Experimental program
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Effect test

Embodiment 1

[0019] The sludge and corncobs are mixed with a mass ratio of 1:1, impregnated with a zinc chloride solution with a mass ratio of zinc chloride and water of 30% for 24 hours, and the dry weight ratio of the dry sludge to zinc chloride is taken 1:0.8, remove the floating liquid, dry at 105°C for 24 hours, and send it into the muffle furnace for carbonization activation. Wherein the activation temperature is 600° C., and the activation time is 60 minutes. The iodine value of the activated carbon prepared under this condition is 678 mg / g, which is 81% of the iodine value of the commercial wood powder activated carbon measured under the same conditions. The specific surface area is 712.81m 2 g -1 , about 89.0% of the specific surface area of ​​commercial activated carbon.

Embodiment 2

[0021] Using sludge, corn cob and the mixture of sludge and corn cob as raw materials respectively, the activation temperature is 600°C, the activation time is 60 minutes, the concentration of zinc chloride is 30%, and the ratio of zinc scrap is 1:0.8. Activated carbon was prepared under the condition of 1:1 mixing of corncob mixture, and the surface functional groups of these activated carbons were determined by Boehm titration, and compared with woody commercial activated carbon. The results are shown in Table 2. The specific operation steps are as follows:

[0022] For a certain carbon sample to be tested, accurately weigh 4 samples with a weight of 1.0g, and put them into 250ml iodine measuring bottles respectively, and then add 25ml of 0.1mol / L HCl solution, 0.1 mol / L NaOH solution, 0.1mol / L Na 2 CO 3 solution, 0.1mol / L NaHCO 3 The solution was shaken for 30 minutes, and then filtered in a constant temperature tank at 25°C for 48 hours to balance. Accurately measure 1...

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Abstract

The invention relates to a method for preparing active carbon with high acid group content by using excess sludge in an urban sewage treatment plant and corn cobs, which comprises the following steps: impregnating the dried and ground sludge and corn cobs for a period of time by using a given amount of zinc chloride solution; after drying, putting the mixture into a muffle furnace for carbonization and activation at a certain temperature; and finally, washing and drying to obtain an excess sludge and corn cob mixture-based active carbon. The prepared active carbon has good adsorption property and high acid group content. The active carbon prepared by the method has the characteristics of cation exchange and strong hydrophilcity, and easily absorbs polar substances and metal ions.

Description

1. Technical field [0001] The invention relates to a method for preparing activated carbon with high acidic group content by utilizing excess sludge and corn cobs of urban sewage treatment plants. 2. Background technology [0002] The remaining sludge of urban sewage plants is a by-product of the sewage treatment system. In 2008, the total sewage discharge in my country reached 57.17 billion tons, and the total sludge discharge reached 1.1434 billion tons (according to the sludge is about 2% of the sewage treatment volume). Because sludge contains toxic and harmful substances such as heavy metals and pathogenic microorganisms, the application of excess sludge in agriculture and composting is limited. It is of great significance to study the methods of resource utilization of excess sludge. Corn cobs are a by-product of the corn processing process. In 2009, my country's total corn output was around 150 million tons. According to the calculation that every 100kg of corn can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12
Inventor 张立秋封莉李道静
Owner BEIJING FORESTRY UNIVERSITY
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