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Nanosized carbon material-activated carbon composite

A carbon composite material, activated carbon technology, applied in nanotechnology, carbon compounds, nanotechnology and other directions, can solve problems such as difficult to formulate polymers

Inactive Publication Date: 2008-11-12
SUD CHEM IP GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, they are very difficult to formulate into polymers because of their inherent tendency to coalesce into parallel strands of carbon nanobeams

Method used

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  • Nanosized carbon material-activated carbon composite
  • Nanosized carbon material-activated carbon composite
  • Nanosized carbon material-activated carbon composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0282] Activated carbon used as support was obtained from VERSATEC SDN (Malaysia). It is produced from palm kernel husks as a waste product in palm production. After activation, it contained, in addition to carbon, a considerable amount (about 6 wt%) of silicate and a trace amount of iron as iron silicate. Activation is carried out in dedicated steps by methods including partial oxidation and steam treatment.

[0283] The activated carbon was pulverized and screened to obtain a uniform particle size distribution with an average particle size of about 0.5 mm. Carbonized precursors typically obtained from palm kernel shells have about 1081 m 2 / g of BET surface area, and 0.365cm 3 / g of pore volume.

[0284] exist figure 1 A scanning electron microscope image (SEM) of the activated carbon thus obtained is given in a.

[0285] To prepare a host for a given hierarchical structure, the resulting AC was mildly oxidized in air at 400 °C for 4 h. The mild oxidation is believed ...

Embodiment 2

[0300] In this example, as described in Example 1, untreated AC, AC mildly oxidized at 400°C (referred to as "AC-400"), and CNF / AC composite (referred to as "NAC") were compared ) for HPA (heteropolymolybdic acid) [PMo 12 O 40 ] 3- and dichromate [Cr 2 O 7 ]2- adsorption capacity. 10 mg of each adsorbent material was suspended in 1.5 ml of HPA or dichromate solution. The starting concentration was 1 mM. The suspension was stirred at room temperature for 1 hour. The concentration of [PMo] was determined photometrically at a selected wavelength of 325 nm. Adsorption tests were performed in Eppendorf-Caps (volume 2.0 ml polyethylene material). No pH adjustment was made since the pH itself had produced dissolved HPA or chromate, respectively (about 3.0 for HPA solution and about 8.5 for chromate).

[0301] The results are given in Table 4 below.

[0302] Table 4

[0303] Adsorption of dichromate or molybdate species in aqueous solution

[0304]

BET

...

Embodiment 3

[0312] Example 3: Synthesis of CNTs on Carbon Black (Nanoscale Support)

[0313] 10.0 g of commercial carbon black (DEGUSSA PRINTEX 40) was suspended in 200 ml of concentrated ammonium hydroxide solution and stirred in an ultrasonic bath (600 W, water as transfer agent) at 300 K (27 °C) for 30 min. The resulting colloidal suspension was separated from the liquid phase by centrifugation and the wet solids were placed in a vertical 25 mm (internal diameter) tubular quartz reactor fixed in a 100 cm long tube furnace. Under the carbon black filler, 0.2 g of Ni-formate filler diluted in 1 g of boron nitride was placed.

[0314] The reactor was flushed with nitrogen and then fed a reactive gas atmosphere of 5% CO in nitrogen at a flow rate of 100 ml / min. The reactor was heated to 573K (300°C) at 5K / min and held at this temperature for 3 hours, then heated to 823K (550°C) at 5K / min and held at this temperature for 3 hours. The gas was replaced with pure nitrogen and cooled under ni...

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Abstract

The present invention relates to carbon-carbon composite material comprising a carbonaceous carrier and nanosize carbon structures (e.g. CNT or CNF), wherein the nanosize carbon structures are grown on the carbonaceous carrier. The carrier may be porous, as in activated carbon or consists of carbon black particles. In accordance with the invention, nanocarbon growth in the pores of porous carriers can be realized. The process for the manufacture of a this carbon-carbon- composite material comprises the steps of treating a carbonaceous carrier material with a metal -containing catalyst material, said metal being capable of forming nanosize carbon structures, and growing nanosize carbon structures by means of a CVD (chemical vapour deposition) method on the treated carrier in a gas atmosphere comprising a carbon-containing gas, followed by an optional surface modification step. This process allows optimising porosity, hydrodynamical properties and surface chemistry independently from each other, which is particularly beneficial in respect of the use of the composite for water purification. Carbon black-based composites are particularly useful for filler applications.

Description

technical field [0001] The present invention relates to carbon composites activated by immobilized nanocarbons, and more particularly the present invention relates to carbon-carbon composites comprising nanocarbon structures grown on carbon-containing supports. Background technique [0002] Based on the rapidly increasing knowledge of their physical and chemical properties, nanocarbon structures such as carbon nanotubes or nanofibers (CNTs or CNFs) have been investigated in a wide range of potential industrial applications including field effect transistors, one-dimensional quantum wires , field emitters and hydrogen storage materials. It has recently been found that nanocarbon structures (hereinafter referred to as "nanocarbons") can also be catalytically activated (CARBON NANOFILAMENTE IN DER HETEROGENENKATALYSE: EINE TECHNISCHE ANWENDUNG KOHLENSTOFFMATERIALIEN? G. Mestl, N.I. Maximova, N. Keller, V.V. Roddatis, and R. Angew.Chem., 113, 2122-2125 (2001);,, CATALYTIC A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02D01F9/127B01J21/18
CPCC02F2305/08C02F2303/02B82Y30/00C02F2103/02B01J23/755C02F1/288C02F2101/308Y10T428/30C02F2303/18C01B31/0233C02F2101/20Y10T428/25B82Y40/00D01F9/127C02F1/283B01J21/18B01J23/745C01B32/162
Inventor 罗伯特·施勒格尔哈米德·谢里凡比宾提OA阿卜杜
Owner SUD CHEM IP GMBH & CO KG
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