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In-situ preparation method and application of Ag/AgCl/NH2-MIL-101(Fe) composite photocatalyst with spindle appearance

An in-situ preparation and composite light technology, applied in the field of environmental pollution control, can solve problems such as large BET surface area, and achieve the effect of improving photocatalytic activity, widening the scope, and simple method

Inactive Publication Date: 2016-04-20
LIAONING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] At present, the application of M-NPs / MOFs composite nanomaterials in the field of photocatalysis is mainly concentrated in the liquid-solid phase system, while there are few studies in the field of degrading gas phase pollutants, and so far, there is no preparation of Ag / MOFs in situ. AgX / MOF has been reported in the literature. Therefore, the preparation of Ag / AgX / MOF composite photocatalyst by one-step in situ method is studied, and the catalyst is applied to the field of gas-solid phase photocatalytic degradation of VOCs, using its unique LCCT energy transfer method and strong The characteristics of light absorption intensity and range, high carrier migration and separation efficiency, and large BET surface area are expected to achieve efficient degradation of VOCs under visible light.

Method used

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  • In-situ preparation method and application of Ag/AgCl/NH2-MIL-101(Fe) composite photocatalyst with spindle appearance
  • In-situ preparation method and application of Ag/AgCl/NH2-MIL-101(Fe) composite photocatalyst with spindle appearance
  • In-situ preparation method and application of Ag/AgCl/NH2-MIL-101(Fe) composite photocatalyst with spindle appearance

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: for the preparation method of this catalyst:

[0024] 1) NH with spindle morphology 2 -Preparation of MIL-101 (Fe) material: preparation by solvothermal method, at room temperature, ferric chloride hexahydrate (FeCl 3˙ 6H 2 O) and 2-aminoterephthalic acid (H2 ATA) dissolved in a certain amount of N,N - In dimethylformamide (DMF) (control the molar ratio of the three: 2:1:156), completely dissolve it by magnetic stirring to form a reddish-brown solution, transfer the mixture to 100mL polytetrafluoroethylene In an ethylene-lined reactor, react at 100°C or 110°C or 120°C for 15 or 20 or 25 or 30 hours, centrifuge after cooling, wash with DMF and ethanol three times respectively, and store at 50 or 60 or 70 or 80°C After vacuum drying for 4 or 6 or 8 or 10 h, a deep reddish-brown solid was obtained.

[0025] 2) Ag / AgCl / NH 2 -In-situ preparation of MIL-101(Fe) composite photocatalyst: This step is prepared in one step by ultraviolet light reduction method....

Embodiment 2

[0029] Example 2: Application of the composite visible light photocatalyst in degrading gas phase VOCs

[0030] According to the Ag / AgCl / NH of the present invention that the preparation method of embodiment 1 makes 2 -MIL-101(Fe) composite photocatalyst, the experiment of photocatalytic degradation of toluene with gaseous organic pollutants was carried out, the reaction was carried out in a self-made quartz reactor, and the reaction process was monitored in situ by infrared spectrometer.

[0031] 1) Fourier transform infrared spectrometer

[0032] In this experiment, the German BRUKERVERTEX70 Fourier transform infrared spectrometer was used to monitor Ag / AgCl / NH 2 - Reaction process of MIL-101(Fe) composite visible light photocatalyst for photocatalytic degradation of gas phase toluene under visible light.

[0033] 2) In situ infrared reaction cell

[0034] It is an in-situ infrared reaction cell designed and processed by ourselves. The entire reaction cell is made of quar...

example 1

[0044] The composite visible light photocatalyst prepared in Example 1 has visible light activity and can be excited by visible light. The recombination probability of photogenerated electron-hole pairs is reduced through the LCCT effect and loading, and the degradation ability of pollutants is effectively improved. Ag / AgCl / NH prepared by the present invention 2 -MIL-101(Fe) composite photocatalyst has strong oxidation ability and high catalytic activity, and has potential application prospects in sewage treatment, air purification and other fields.

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Abstract

The invention provides an in-situ preparation method and application of an Ag / AgCl / NH2-MIL-101(Fe) composite photocatalyst with a spindle appearance, and belongs to the technical field of environmental pollution improvement. The in-situ preparation method comprises the following steps: preparing a NH2-MIL-101(Fe) nanometer material with a regular hexagon-shaped section and a spindle appearance according to a solvothermal method by taking FeCl3.6H2O and 2-amino-terephthalic acid as raw materials, wherein the average length of the edges of the nanometer material is about 700 nm, and the average length of the sides of the regular hexagon-shaped cross section is about 200 nm; preparing the Ag / AgCl / NH2-MIL-101(Fe) composite photocatalyst with the spindle appearance in situ according to an ultraviolet light reduction method. According to the method, the reaction between Cl- in the NH2-MIL-101(Fe) nanometer material and Ag+ in a silver nitrate solution, and the reducing action of ultraviolet light are utilized, and no other exogenous chlorine source is added, so that the in-situ preparation method is simple, convenient, and mild in condition; Ag / AgCl nano-particles are loaded on the NH2-MIL-101(Fe) nanometer material; electron transfer efficiency is further improved via the surface plasma resonance effect, so that the recombination probability of photogenerated electron-hole pairs is reduced, and gaseous pollutants are effectively degraded.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control and relates to a Ag / AgCl / NH 2 -In-situ preparation method of MIL-101(Fe) composite photocatalyst and application of the catalyst. Background technique [0002] At present, indoor air pollutants that affect human health mainly include nitrogen oxides (NO x ), carbon oxides (CO, CO 2 ), volatile organic pollutants (VOCs), and suspended particulate matter. Among them, VOCs mainly come from combustion by-products, building materials, office equipment, etc., and have "three effects". Therefore, how to effectively control and manage VOCs has important scientific significance and practical value. [0003] Among the many VOCs control technologies, photocatalytic oxidation technology, as a typical advanced oxidation technology, is considered to be one of the most promising new technologies in control technology. The technique uses photons to excite semiconductor materials such ...

Claims

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Application Information

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IPC IPC(8): B01J31/26B01J35/02B01D53/72B01D53/86
CPCB01D53/72B01D53/8668B01J31/1691B01J31/26B01D2255/705B01D2255/104B01D2257/7027B01D2255/802B01J2531/842B01J35/00B01J35/30B01J35/39
Inventor 张治广
Owner LIAONING NORMAL UNIVERSITY
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