Photochemical preparation method of single atom Au for catalytic degradation of VOCs

A catalytic degradation and photochemical technology, applied in the field of preparation of single-atom Au, can solve the problems of no single-atom catalyst catalytic degradation VOCs patent, how VOCs degradation ability remains to be investigated, low load processing efficiency, etc., to achieve novel preparation method and process The effect of novelty, novelty and high efficiency

Inactive Publication Date: 2017-05-10
TIANJIN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] Patent No. CN105478136A discloses a catalyst for synergistic low-temperature plasma catalytic degradation of industrial organic waste gas and its preparation method and application. The carrier used is SiC, and the main active ingredient is at least one of noble metals and at least one of transition metal oxides. A mixture of species, the promoter component is a mixture of at least one rare earth metal oxide and at least one alkaline earth metal oxide, the catalyst has low price, long lif...

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  • Photochemical preparation method of single atom Au for catalytic degradation of VOCs
  • Photochemical preparation method of single atom Au for catalytic degradation of VOCs
  • Photochemical preparation method of single atom Au for catalytic degradation of VOCs

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[0026] The photochemical preparation method of single-atom Au for catalytic degradation of VOCs of the present invention comprises the following steps:

[0027] Step 1. Preparation of atomically thick TiO 2 Nanosheets:

[0028] (a) TiCl 3 Add ethylene glycol into the reactor, stir mechanically, and react completely at 100-200°C, the TiCl 3 The mass ratio with ethylene glycol is 1:10~40, and the mass percentage concentration of described ethylene glycol is 60%;

[0029] (b) centrifugally filtering the reacted liquid, and then drying the separated precipitate in an oven at 70-110° C. to remove moisture to obtain a dry solid;

[0030] (c) Grinding the dry solid, then passing through a sieve to obtain 40-60 mesh TiO 2 Nano powder;

[0031] Step 2. Using photochemical method to support single atom Au:

[0032] (a) TiO 2 The nano powder is dispersed in deionized water and ultrasonically dispersed to obtain TiO 2 uniform dispersion;

[0033] (b) Add HAuCl to the dispersion w...

Embodiment 1

[0047] Step 1. Preparation of atomically thick TiO 2 Nanosheets:

[0048] (a) TiCl 3 Add ethylene glycol into the reactor, stir at 200r / min, react at 100°C for 6h, the TiCl 3 The mass ratio with ethylene glycol is 1:10, and the mass percent concentration of said ethylene glycol is 60%;

[0049] (b) centrifugally filtering the reacted liquid, and then drying the separated precipitate in an oven at 70° C. for 6 hours to remove moisture to obtain a dry solid;

[0050] (c) Grinding the dry solid, then passing through a sieve to obtain 40-60 mesh TiO 2 Nano powder;

[0051] Step 2. Using photochemical method to support single atom Au:

[0052] (a) TiO 2 The nano powder was dispersed in deionized water and ultrasonically dispersed for 0.5h to obtain TiO 2 uniform dispersion;

[0053] (b) Add HAuCl to the dispersion while stirring the dispersion continuously 4 Solution, stirring speed is 100r / min, stirs 30min to obtain mixed solution; Described HAuCl 4 The concentration of ...

Embodiment 2

[0073] Step 1. Preparation of atomically thick TiO 2 Nanosheets:

[0074] (a) TiCl 3 Add ethylene glycol into the reactor, stir at 300r / min, react at 150°C for 5h, the TiCl 3 The mass ratio with ethylene glycol is 1:20, and the mass percent concentration of said ethylene glycol is 60%;

[0075] (b) Centrifugally filter the reacted liquid, and then dry the separated precipitate in an oven at 90° C. for 5 hours to remove moisture to obtain a dry solid;

[0076] (c) Grinding the dry solid, then passing through a sieve to obtain 40-60 mesh TiO 2 Nano powder;

[0077] Step 2. Using photochemical method to support single atom Au:

[0078] (a) TiO 2 The nano powder was dispersed in deionized water and ultrasonically dispersed for 0.5h to obtain TiO 2 uniform dispersion;

[0079] (b) Add HAuCl to the dispersion while stirring the dispersion continuously 4 Solution, stirring speed is 100r / min, stirs 25min to obtain mixed solution; Described HAuCl 4 The concentration of the so...

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Abstract

The present invention discloses a photochemical preparation method of a single atom Au for catalytic degradation of VOCs, and the method includes following steps: step 1, preparation of TiO2 nano-sheets in thickness of atomic scale: (a) adding TiCl3 and ethylene glycol to a reactor, and performing mechanic stirring; (b) filtering a liquid obtained after the above reaction by centrifugation, and then drying separated sediments to remove water; (c) grinding the dried solid, and conducting screening to obtain nano-powder of TiO2; and step 2, loading the single atom Au by a photochemical method. The single atom Au catalyst prepared by the method has high treatment efficiency in processes of plasma catalytic degradation of VOCs (the toluene removal rate is 98.4% and the dichloromethane removal rate is 98.2%). The single atom Au catalyst has long service life (after being used for 200 hours, the removal rate of the single atom Au catalyst on toluene and dichloromethane can reach 94.9% and 97.4%, respectively).

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a method for preparing single-atom Au that catalyzes and degrades VOCs waste gas in a plasma system. Background technique [0002] Volatile organic compounds VOCs (Volatile Organic Compounds) are an important class of air pollutants, defined by the World Health Organization as organic compounds with a boiling point of 50-260°C and a saturated vapor pressure of more than 133Pa at room temperature, including alkanes, alkenes, aromatics and their Derivatives, alcohols, aldehydes and ketones, amines and amides, acids and anhydrides, etc. VOCs are an important air pollutant, which is very harmful to the human body, can cause various discomforts to the human body, and is toxic and irritating. Many VOCs are known to have neurotoxicity, kidney and liver toxicity, and even carcinogenicity, which can damage the cardiovascular system, cause gastrointestinal disorders, induce immune sy...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01D53/86B01D53/72B01D53/70
CPCB01D53/8662B01D53/8668B01D2255/802B01D2257/2064B01D2257/7027B01J23/52B01J35/004
Inventor 丁辉邢中鹏
Owner TIANJIN UNIV
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