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Oxygen functionalized carbon material and use thereof

A technology of functional grouping and carbon materials, applied in the direction of catalyst carriers, other chemical processes, chemical instruments and methods, etc., can solve the problems of poor repeatability of carbon material products, differences in performance of adsorbents and catalysts, etc., and achieve short preparation cycle, Increased adsorption capacity and wide application range

Inactive Publication Date: 2009-08-19
DALIAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, due to the varied precursors for preparing carbon materials such as coal and biomass, the reproducibility of carbon material products is not good, resulting in large differences in the performance of adsorbents and catalysts using carbon materials as raw materials.

Method used

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  • Oxygen functionalized carbon material and use thereof
  • Oxygen functionalized carbon material and use thereof
  • Oxygen functionalized carbon material and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 200 grams of carbon material and put it into the reactor, then add 1000 grams of 5%, 10%, 15% and 30% hydrogen peroxide solution, place it in a constant temperature water bath at 80 ° C for 5 hours, then filter and wash , and dried to obtain a surface-modified carbon material. Depend on figure 1 It can be seen that in the infrared spectrogram of the raw material activated carbon, except at 3450cm -1 The left and right can be attributed to the surface phenolic hydroxyl group or outside the peaks of adsorbed water, at 2955 and 2885cm -1 The spectrum peaks can be attributed to the C-H vibration peaks, there is no or very weak carboxyl peak near 1700, and the 1660cm -1 Spectrum peak greater than 1550cm -1 Spectral peaks, implying its poor hydrophilicity and lack of basic sites. figure 2 The infrared spectra of activated carbon after oxidative modification with different concentrations of hydrogen peroxide for 5 hours are given. It can be seen from the figure tha...

Embodiment 2

[0020] Weigh 200 grams of raw carbon material and put it into a reactor, then add 5% hydrogen peroxide solution with a concentration of 1000 grams, place it in a constant temperature water bath at 80 ° C for reflux treatment for 2, 3.5 and 5 hours, then filter, wash, and dry to obtain Surface-modified carbon materials. Depend on image 3 It can be seen that with the prolongation of hydrogen peroxide treatment time, at 2955 and 2885cm -1 The peak of the spectrum is attributed to the disappearance of the peak of the C-H vibration, and at the same time at 1275cm -1 The C-O stretching vibration peak is more obvious. The results showed that the structure of oxygen-containing functional groups on the surface increased significantly after oxidation treatment.

[0021] The texture parameters of modified samples and raw carbon materials treated with hydrogen peroxide for different times were characterized by nitrogen adsorption, and the results are shown in Table 1. It can be seen ...

Embodiment 3

[0026] Weigh 10 grams of raw carbon material and put it into a reactor, then add 5% hydrogen peroxide solution with a concentration of 100 grams, place it in an ultrasonic generator (60W, 20KHz) for 0.5h, filter, wash, and dry to obtain a surface-modified The carbon material is detected by infrared spectroscopy, and it is found that the oxygen-containing functional groups on the surface of the carbon material increase. And the results of X-ray diffraction showed that the amorphous structure of activated carbon was basically unchanged.

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Abstract

The invention discloses an oxygen-functionalized carbon material and uses of the same, and belongs to the technical field of adsorbent. The invention is characterized in that the oxygen-functionalized carbon material is prepared by oxidative modification of hydrogen peroxide or ultrasonic-assisted hydrogen peroxide; the number of oxygen-containing functional groups on the surface of the carbon material after the oxidative modification of the hydrogen peroxide is obviously increased, but the pore structure and the strength of the carbon material are basically kept unchanged; the adsorption capacity of the oxygen-functionalized carbon material on metallic ions such as Ag, Cu and Cr is greatly improved compared with a raw material carbon; and when an impregnated carbon catalyst prepared by infusing the oxygen-functionalized carbon material is used for protecting cyan chloride, the protection time of the impregnated carbon catalyst is improved by 20 to 30 percent under the same preparation condition compared with the raw material carbon. The oxygen-functionalized carbon material prepared by the oxidative modification of the hydrogen peroxide or the ultrasonic-assisted hydrogen peroxide has the advantages of simple process, quickness, environmental protection, and the like, and provides an effective carbon carrier for the impregnated carbon catalyst for protecting the cyan chloride.

Description

technical field [0001] The invention belongs to the technical field of adsorbents, and mainly relates to oxidation surface modification of carbon materials, ultrasonic oxidation surface modification of carbon materials and the adsorption and catalytic performance of surface modified carbon materials, in particular to a method for quickly and pollution-free surface modification of carbon materials. Specifically, carbon materials are surface-modified by methods such as hydrogen peroxide or ultrasonic-assisted hydrogen peroxide oxidation modification, and the obtained oxygen-functionalized carbon materials have abundant oxygen-containing functional groups, and the pore structure and strength remain basically unchanged. Oxygen-functionalized carbon materials for Ag + 、Cu 2- 、Cr 6+ Compared with raw carbon materials, the adsorption capacity of such metal ions has been greatly improved; when impregnated carbon catalysts prepared by impregnating oxygen-functionalized carbon materia...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/62B01J32/00
Inventor 梁长海李闯贾建国朱春来肖春英
Owner DALIAN UNIV OF TECH
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