Method for preparing activated carbon-carried nano-gold catalyst

A technology of activated carbon and nano-gold, which is applied in the field of environmental engineering, can solve the problems of activated carbon such as lack of ozonolysis activity, low gold utilization rate, and poor moisture resistance, and achieve excellent catalytic decomposition, good stability, and stable valence. Effect

Inactive Publication Date: 2010-07-28
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But activated carbon lacks sufficient long-term ozonolysis activity, and also has poor moisture resistance
Under the conditions of relative humidity of 50% and surface velocity of 1.52cm / s, the ozone decomposition efficiency of 120ppb concentration can be reduced from 100% to less than 20% in less than 100 minutes, so the promotion of activated carbon has been severely restricted. limit
Although the activated carbon-loaded gold particles prepared by this method are relatively small, the operation steps are more complicated, and the pre-prepared gold sol cannot be fully loaded on the activated carbon carrier, so the utilization rate of gold is low, which leads to high cost of catalyst preparation.

Method used

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  • Method for preparing activated carbon-carried nano-gold catalyst
  • Method for preparing activated carbon-carried nano-gold catalyst
  • Method for preparing activated carbon-carried nano-gold catalyst

Examples

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preparation example Construction

[0033] Such as figure 1 Shown is the flowchart of the preparation method of the activated carbon-supported nano-gold catalyst of the embodiment of the present invention, comprising the following steps:

[0034] Step S101, prepare an impregnating solution, add at least one organic acid protecting agent in the impregnating solution, the acid dissociation constant (pKa value) of the organic acid protecting agent is close to the isoelectric point of activated carbon / activated carbon fiber carrier, and adjust the pH of the impregnating solution The value is close to the isoelectric point of activated carbon / activated carbon fiber support. In one embodiment of the present invention, the organic acid protecting agent includes but not limited to such as fumaric acid, aspartic acid or iodoacetic acid, certainly those skilled in the art can also select other according to the characteristic of the organic acid protecting agent proposed in the present invention Organic acids, these shoul...

Embodiment 1

[0038]Example 1: Preparation of activated carbon-supported nano-gold catalyst with fumaric acid as protective agent

[0039] Chlorauric acid (HAuCl 4 4H 2 O) and fumaric acid [C 2 h 2 (COOH) 2 ] Molar ratio is HAuCl 4 4H 2 O:C 2 h 2 (COOH) 2 = 1:4, prepare 100mL of impregnation solution with Au content of 0.25g / L. Use NaOH to adjust the pH value of the solution to 4.5, impregnate 5 g of modified activated carbon into the solution, ultrasonically disperse it for 2 minutes under the condition of a power of 40 W, filter out the activated carbon after standing for 2 minutes, and wash it with hot water until it is useless. Cl - Detected, irradiated with 750W microwave for 1min, at 200℃ with H 2 After reducing for 40 minutes, the activated carbon-supported nano-gold catalyst is prepared, and the catalyst can be stored at room temperature for a long time.

[0040] Compared with ethylenediamine using the same existing method, such as figure 2 Shown, are respectively the ...

Embodiment 2

[0042] Example 2: Preparation of activated carbon-supported nano-gold catalyst with aspartic acid as protective agent

[0043] Chlorauric acid (HAuCl 4 4H 2 O) and aspartic acid [COOHCH 2 CH(NH 2 )·COOH] is HAuCl in molar ratio 4 4H 2 O: COOHCH 2 CH(NH 2 )·COOH=1:4, prepare 100mL of immersion solution with Au element content of 0.05g / L. Use NaOH to adjust the pH value of the solution to 4.5, impregnate 5 g of modified activated carbon into the solution, ultrasonically disperse it evenly for 1.5 min under the condition of a power of 40 W, filter the activated carbon after standing for 2 min, and wash it with hot water until it is used. Cl-free - For detection, irradiate with 750W microwave for 1min, and use H at 200°C 2 After reducing for 40 minutes, the activated carbon-supported gold catalyst is prepared, and the catalyst can be stored at room temperature for a long time.

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Abstract

The invention provides a method for preparing an activated carbon-carried nano-gold catalyst, comprising the following steps of preparing a dipping solution, adding at least one organic acid protective agent in the dipping solution, wherein the pKa value of the organic acid protective agent is close to the isoelectric point of the activated carbon/activated carbon fiber carrier, adjusting the pH value of the dipping solution to be close to the isoelectric point of the activated carbon/activated carbon fiber carrier; quickly and evenly putting the activated carbon/activated carbon fiber carrier in the dipping solution, mechanically stirring or ultrasonically mixing, standing, filtering, and then rinsing and drying the filtered carrier; roasting and reducing the dried gold-carried carrier to obtain an activated carbon/activated carbon fiber-carried nano-gold catalyst. The invention makes gold particles carried on the activated carbon have small size and be distributed evenly and improves the utilization rate of gold; and the low-concentration ozone and volatile organic compound in the air can be effectively dissolved by the catalyst.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a preparation method for loading nano-gold catalyst on activated carbon. Background technique [0002] With the continuous advancement of social science and technology, environmental pollution is increasingly threatening human health and has become an urgent challenge for human beings today. Especially gases such as ozone will directly cause harm to the human body, causing serious hazards such as respiratory damage. Ozone is a strong oxidizing gas, and it will cause harm to human health if it exceeds a certain concentration. Therefore, my country's "Indoor Air Quality Standard (GB / T18883-2002)" stipulates that the average concentration in one hour should not exceed 0.16mg / m 3 . However, now many office or household appliances, such as printers, copiers, ozone disinfection cabinets, air purifiers, etc. will also release ozone, so the threat of harmful gases suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52A61L9/01A61L9/00A61L101/04
Inventor 张彭义张博
Owner TSINGHUA UNIV
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