Titanium-dioxide charcoal composite material and preparation method thereof

A technology of titanium dioxide and composite materials, applied in chemical instruments and methods, other chemical processes, chemical/physical processes, etc., can solve the problem of decreased adsorption active sites and catalytic active sites, insufficient binding force between carbon materials and titanium dioxide, and reduced carbon Material active adsorption sites and other issues, to achieve high adsorption/catalysis synergistic effect, good adsorption/photocatalytic synergistic treatment effect, and low cost effect

Active Publication Date: 2014-11-05
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] (1) The preparation of composite materials is basically divided into two steps. First, activated carbon, carbon black, and bamboo charcoal with strong adsorption capacity are obtained, and then the supported titanium dioxide is prepared by the direct loading method of titanium dioxide or the loading method of titanium dioxide precursor. The preparation process is complicated. In addition, the carbon materials used generally need to be activated, and the cost is high;
[0008] (2) The composite materials prepared by direct loading method using carbon materials and titanium dioxide as raw materials have the problem of insufficient binding force between carbon materials and titanium dioxide (direct mechanical mixing), or the addition of organic binders makes the adsorption active sites and Catalytic active sites have different degrees of decline;
[0009] (3) Titanium dioxide / carbon composite photocatalyst prepared by titanium dioxide precursor loading method, titanium dioxide nanopowder is generally coated on the surface of carbon material, and it is easy to cause pore blockage of carbon material, reducing the active adsorption sites of carbon material , so that the adsorption effect is significantly reduced, thereby affecting the catalytic activity

Method used

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  • Titanium-dioxide charcoal composite material and preparation method thereof
  • Titanium-dioxide charcoal composite material and preparation method thereof
  • Titanium-dioxide charcoal composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The mass percentage of charcoal in the composite material of titanium dioxide and charcoal described in this example is 38%, the microstructure of the carbon maintains the structure of the wood structure, the titanium dioxide is uniformly dispersed on the surface of the charcoal, and the titanium dioxide has both anatase and rutile phases, The mass ratio of anatase and rutile phases is 82:28, and the particle size of titanium dioxide is 12 nm.

[0041] The preparation method of the composite material of titanium dioxide and charcoal described in this embodiment specifically includes the following steps:

[0042] (1) Pretreatment of wood-based biological templates: cut paulownia into small pieces (length, width and height 50mm × 20mm × 20mm), then immersed in 2 mol / L nitric acid at 60 °C for 12 h, repeated twice, and then with anhydrous ethanol Immerse at 60°C for 12h, repeat 2 times, and finally soak with distilled water at 80°C for 12h, repeat 2 times, and dry at 60°C ...

Embodiment 2

[0049] The mass percentage of charcoal in the composite material of titanium dioxide and charcoal described in this example is 30%, the microstructure of the carbon maintains the structure of the wood structure, the titanium dioxide is uniformly dispersed on the surface of the charcoal, and the titanium dioxide has both anatase and rutile phases. The mass ratio of anatase and rutile phases is 78:22, and the particle size of titanium dioxide is 15 nm.

[0050] The preparation method of the composite material of titanium dioxide and charcoal described in this embodiment specifically includes the following steps:

[0051] (1) Pretreatment of wood-based biological templates: Cut thorn trees into small pieces (length, width and height 50mm×20mm×20mm), and then immerse them in 2mol / L nitric acid at 40°C for 6h, repeat twice, and then use anhydrous Dipping in ethanol at 60°C for 6h, repeated twice, and finally soaking in distilled water for 12h at 40°C, repeated three times, and dryi...

Embodiment 3

[0058] The mass percentage of charcoal in the composite material of titanium dioxide and charcoal described in this example is 40%, the microstructure of the carbon maintains the structure of the wood structure, the titanium dioxide is uniformly dispersed on the surface of the charcoal, and the titanium dioxide has both anatase and rutile phases. The mass ratio of anatase and rutile phases is 75:25, and the particle size of titanium dioxide is 12 nm.

[0059] The preparation method of the composite material of titanium dioxide and charcoal described in this embodiment specifically includes the following steps:

[0060] (1) Pretreatment of wood-based biological templates Cut the thorn tree into small pieces (length, width and height 50mm×20mm×20mm), then soaked in 2mol / L nitric acid at 40°C for 6h, repeated twice, and then used anhydrous ethanol Immerse at 60°C for 6h, repeat 2 times, and finally soak with distilled water for 12h at 40°C, repeat 3 times, and dry at 40°C for 12h...

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Abstract

The invention discloses a titanium-dioxide charcoal composite material and a preparation method thereof, and belongs to the field of semiconductor photocatalysts. According to the titanium-dioxide charcoal composite material, the microstructure of charcoal keeps the structure of wood tissue, titanium dioxide is uniformly dispersed on charcoal surface, and titanium dioxide has anatase phase and rutile phase at the same time. The method comprises: firstly performing pretreatment on a wood biological template; dipping the wood biological template in a precursor solution, using a sol-gel method or a hydro-thermal method to depositing TiO2 particles in micropores of the wood template, so as to obtain the wood biological template of titanium dioxide; and finally sintering in a muffle furnace to obtain the titanium-dioxide charcoal composite photocatalyst. The prepared titanium-dioxide charcoal composite material is applicable to remove environmental endocrine disruptors in water and other organic pollutants in water, has the adsorption removal rate of 32.3-86.5%, the photocatalysis removal rate of 11-20% and the total adsorption / photocatalysis synergic removal rate of 50.3-97.5%, and has relatively good application prospect.

Description

technical field [0001] The invention relates to a composite material of titanium dioxide and charcoal and a preparation method thereof, belonging to the field of semiconductor photocatalysts. Background technique [0002] Environmental endocrine disruptors refer to exogenous substances that interfere with the synthesis, secretion, transport, binding, reaction and metabolism of hormones in the organism, thereby affecting the normal maintenance of the organism and harming reproduction, development or behavior. They have toxicity persistence, hazard latent and bioaccumulation, and have the characteristics of wide pollution range, strong hydrophobicity and low concentration (often ng / L), etc. They can be enriched and gradually amplified through the food chain, and directly or indirectly It has become a hot spot and a difficulty in environmental governance. [0003] Titanium dioxide photocatalysis technology is a new "environmentally friendly" water treatment technology, which h...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J20/20B01J20/32C02F1/28C02F1/32
Inventor 潘学军罗利军张学嘉杨晔林澎袁波蒋峰芝
Owner KUNMING UNIV OF SCI & TECH
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