BiOCl photocatalyst with cotton-shaped structure and preparation method thereof

A photocatalyst and cotton technology, applied in chemical instruments and methods, physical/chemical process catalysts, bismuth compounds, etc., can solve problems such as the inability to decompose methyl orange dye wastewater, and achieve low cost, excellent adsorption performance, and large specific surface area Effect

Active Publication Date: 2015-04-08
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Methyl Orange (Methyl Orange, MO) is a representative azo dye, which is widely used in chemical, textile, and paper industries. Commonly used biological, physical and chemical sewage treatment methods cannot completely decompose methyl orange dye wastewater. , and there is no report on the photocatalytic degradation of methyl orange by BiOCl under visible light.

Method used

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  • BiOCl photocatalyst with cotton-shaped structure and preparation method thereof
  • BiOCl photocatalyst with cotton-shaped structure and preparation method thereof
  • BiOCl photocatalyst with cotton-shaped structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The BiOCl photocatalyst involved in this embodiment has a cotton-like structure formed by stacking ultra-thin nano-sheets, the lateral size of the ultra-thin nano-sheets is 50-500 nm, and the thickness size is 2-12 nm.

[0022] The BiOCl photocatalyst involved in the present embodiment carries out phase identification by X-ray powder diffractometer (model Rigaku D-max-γA, manufacturer Nippon Electronics Co., Ltd.) (such as figure 1 shown), calibrated as a tetragonal BiOCl photocatalyst (JCPDS No.06-0249), the lattice constant is No miscellaneous peaks were found in the spectrum, indicating that the phase of the reaction product was pure without any miscellaneous phase; the peak shape was sharp, indicating that the reaction product was crystallized well.

[0023] The BiOCl photocatalyst application scanning electron microscope (SEM) that the present embodiment relates to observes its basic shape and can know (such as figure 2 Shown in (a), the BiOCl photocatalyst samp...

Embodiment 2

[0030] In this example, the optical performance test of the BiOCl photocatalyst prepared by the preparation method of the BiOCl photocatalyst described in Example 1 was carried out, and it was proved that its absorption wavelength was up to 370 nm.

[0031] Adopt ultraviolet-visible diffuse reflection spectrometer (model Lambda35, producer U.S. Perkin Elemr company) to test in the present embodiment, obtain the ultraviolet-visible diffuse reflection absorption spectrum of BiOCl photocatalyst (such as Figure 5 shown), the absorption wavelength λg of the prepared BiOCl photocatalyst sample as can be seen from the spectrogram is 370nm, indicating that the excitation region of the sample is in the ultraviolet region (theoretically can not be excited by visible light); calculated by the formula Eg=1240 / λg Obtained, the forbidden band width Eg value of the prepared BiOCl photocatalyst sample is 3.35eV.

Embodiment 3

[0033] In this example, the photocatalytic activity of the BiOCl photocatalyst sample was evaluated by degrading methyl orange under visible light (wavelength λ>420nm), indicating that the BiOCl photocatalyst prepared by the present invention has good photocatalytic activity under visible light and can rapidly degrade methyl orange. Orange, the degradation rate is 91.5% / 180min.

[0034] The specific experimental process is:

[0035] (1) Configure BiOCl-methyl orange mixed solution

[0036] Dissolve 5mg of methyl orange powder in 500ml of distilled water, and ultrasonically treat it at an ultrasonic frequency of 40Khz for 30 minutes to fully dissolve it to obtain a methyl orange solution with a mass concentration of 10mg / L; measure 100ml of the methyl orange solution and place it in 250ml In the reactor, add 20-100mg prepared BiOCl photocatalyst powder simultaneously, obtain BiOCl-methyl orange mixed solution;

[0037] (2) Dark adsorption of methyl orange on BiOCl photocataly...

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Abstract

The invention belongs to the technical field of catalyst preparation, and relates to a visible light photocatalyst BiOCl with a cotton-shaped structure and a preparation method thereof; the visible light photocatalyst BiOCl is prepared by adopting a room temperature chemical method; the prepared BiOCl photocatalyst has the unique cotton-shaped structure formed by stacking ultrathin nanosheets; the special structure endows the BiOCl photocatalyst with relatively large specific surface area and excellent adsorption performance, so that the photoresponse range of the BiOCl is widened to a visible light region, and the BiOCl can successfully rapidly degrade a stable pollutant methyl orange under visible light irradiation; and the product has the advantages of large specific surface area, high photocatalytic efficiency, simple preparation process, convenient operation, low cost, high yield and high purity.

Description

Technical field: [0001] The invention belongs to the technical field of photocatalyst preparation, and relates to a visible light photocatalyst BiOCl with a cotton-like structure and a preparation method thereof. The prepared BiOCl photocatalyst has a cotton-like structure formed by stacking ultra-thin nanosheets. BiOCl photocatalyst has excellent photocatalytic activity, which can fully adsorb and photosensitize methyl orange and then degrade rapidly under visible light irradiation. Background technique: [0002] At present, the application of photocatalytic materials to degrade toxic organic pollutants in the environment has been proven to be the most effective way to control environmental pollution, among which semiconductor photocatalytic materials are the most widely used; as an important V-VI-VII semiconductor material, BiOCl has been It proves to be a new type of high-efficiency photocatalyst, but because BiOCl has a band gap of 3.19-3.44eV, it cannot be excited by vi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/10C01G29/00B82Y40/00C02F1/30C02F101/34C02F101/38
CPCY02W10/37
Inventor 赵梅董立峰李成栋王贝李平付博
Owner QINGDAO UNIV OF SCI & TECH
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