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The Synthesis of Hybrid Mesoporous Carbons and Their Applications

Author: FengCuiMiao
Tutor: WanYing
School: Shanghai Normal University
Course: Physical and chemical
Keywords: Hybrid Mesoporous Carbon Nitrogen-doped Acid complex Adsorption
CLC: O643.36
Type: Master's thesis
Year: 2008
Downloads: 479
Quote: 2
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Abstract

The mesoporous carbon material having a good electrical conductivity, the a strong skeleton rigidity and a large specific surface area. These characteristics make it has tremendous application potential in the electrochemical adsorption and catalytic. The hybrid mesoporous carbon material due to the special properties of the inorganic solid uniform mesoscopic channels and hybrid components at the same time caused a great concern. In view of this, the paper select orderly hybrid mesoporous carbon as the main object of study, the use of direct non-ionic surfactant template synthesis. Major consideration in the synthesis of organic precursor reaction performance, one-step access to the the hybrid mesoporous carbon material. The mesoporous carbon heteroaryl expected for the abrasion resistant material, the electro-catalyst material, efficient adsorbent and catalyst carrier. First, organic - organic self-assembly technology synthetic nitrogenous ordered mesoporous polymer and mesoporous carbon. Organic precursor is generated with phenol and formaldehyde A-stage phenolic resins and inter - aminophenol triblock copolymer F127 surfactant. Can be controlled by adjusting the amount of the aminophenol to the mesoporous polymer and the molar fraction of N carbon is 0.2% - 1.6%. Nitrogen-doped mesoporous carbon with high mesoscopic ordering degree, large specific surface area (~ 1200 m2 / g), large pore volume (~ 0.65 cm3 / g) and uniform pore size distribution. The incorporation of N to increase the degree of graphitization of the mesoporous carbon. Third chapter the use of self-assembly technology, the choice of A resol, TEOS, aluminum isopropoxide or aluminum chloride as a precursor, triblock copolymer F127 as a structure directing agent synthetic acidic oxide doped mesoporous carbon composite material. The resulting mesoporous C/SiO2-Al2O3 composite specific surface area of ??~ 439 m2 / g, pore volume is to 0.45 cm3 / g, a pore diameter of ~ 6.4 nm. SiO2-Al2O3 complex acid sites and acidic sites are uniformly distributed in the carbon skeleton. The fourth chapter of the thesis is to study the the acid organic - organic self-assembly. The results show that the reactive acid, such as boric acid and phosphoric acid, can be formed with the A-stage phenolic resin reaction of the polymer of the boron or phosphorus in the carbonization process, the C-B bond can be maintained, resulting mesoporous carbon containing a hetero atom. At the same time, a boron or phosphorus polymer generation reduces the volume of the hydrophilic end of the system, result in a mesoscopic phase transition. On the other hand, non-reactive acid, such as hydrochloric acid and sulfuric acid, does not participate in organic - organic self-assembly process, but to promote the cross-linking of the polymer, to some extent, affect mesoporous carbon material mesoscopic ordering degree. Fifth major research organic - organic self-assembly technology highly ordered mesoporous carbon adsorption behavior of dyes in wastewater macromolecules. The results show that the porosity and pore size of the mesoporous carbon will affect their adsorption of Dye macromolecules. The high specific surface area and pore size of mesoporous carbon has a high adsorption capacity of dye. For example, mesoporous carbon Rhodamine B adsorption capacity of 876 mg / g, while carbon only 128 mg / g.

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