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Rare earth modified photocatalyst as well as degradable plastic film prepared thereby and preparation method thereof

A rare earth modification, photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as plastic pollution, achieve simple preparation, visible light Improved utilization and remarkable effect

Inactive Publication Date: 2008-05-21
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to solve the problem of plastic pollution in the prior art, to provide a rare earth modified photocatalyst that can modify the plastic film, so that the plastic film has degradability

Method used

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  • Rare earth modified photocatalyst as well as degradable plastic film prepared thereby and preparation method thereof
  • Rare earth modified photocatalyst as well as degradable plastic film prepared thereby and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: Add Ce2.0%-TiO 2 with TiO 2 Photocatalytic Degradation Comparison of Powder Composite Films

[0026] (1) Ce2.0%-TiO 2 (weight percent) and TiO 2 Powder preparation: Mix 17ml butyl titanate with 40ml 95% ethanol to form solution A; 1ml 1mol·l -1 Ce(NO 3 ) 3 Add the solution to a mixture of 10ml glacial acetic acid, 40ml 95% ethanol and 9ml deionized water to obtain solution B; drop solution A into solution B, stir for 1h to form a uniform transparent sol, and age at room temperature for 2d to form After gelling, dry it at 373K, grind it into powder, and heat-treat it at 737K for 2 hours to get Ce-doped TiO 2 Powder, denoted as Ce2.0%-TiO 2 . Preparation of pure TiO 2 The method is the same as the above method, except that Ce ions are not added. Studies have shown that Ce2.0%-TiO 2 The absorption band edge of pure TiO 2 The obvious red shift, and in the ultraviolet and visible parts Ce2.0%-TiO 2 The absorption spectrum of pure TiO 2 The absorpt...

Embodiment 2

[0028] Example 2: Adding Ce2.0%-TiO 2 with TiO 2 Photocatalytic Degradation of Sol Composite Films

[0029] (1) Ce2.0%-TiO 2 (weight percent) and TiO 2 Sol preparation: Dissolve 8g of titanium sulfate in ammonia water, add 1ml of 1mol·l -1 Ce(NO 3 ) 3 Solution, to obtain an aqueous solution containing a certain concentration of Ti, take 80ml and place it in a 200ml stainless steel reactor with a polytetrafluoroethylene lining at 120°C for hydrothermal crystallization for 12h, filter, wash, and use 0.2mol l -1 BaCl 2 Test solution test SO 4 2- Until it is washed, mix the filter cake with nitric acid solution according to the required preparation concentration and place it in a constant temperature water bath at 333-353 K for 10-20 hours to obtain TiO with a Ce doping amount of 2.0%. 2 Sol, denoted as Ce2.0%-TiO 2 -sol. Preparation of pure TiO 2 The method is the same as the above method, except that Ce ions are not added.

[0030] (2) Add Ce2.0%-TiO 2 Composite fi...

Embodiment 3

[0031] Example 3: Adding TiO with different Ce doping ratios 2 Photocatalytic Degradation of Composite Thin Films

[0032] (1) Different Ce doping ratio-TiO 2 Preparation of powder: same as above-mentioned Example 1 step (1), but adjust the ratio of rare earth elements and titanium (atomic concentration) to be 0.2%, 0.7% and 1.2%, respectively, to obtain Ce0.2%-TiO 2 , Ce0.7%-TiO 2 and Ce1.2%-TiO 2 Catalyst powder or sol. Analysis shows that, the same as the photocatalyst made in embodiment 1, their absorption band edges are all relatively pure TiO 2 The obvious red shift, and the absorption spectrum in the ultraviolet and visible part is better than that of pure TiO 2 The absorption spectrum is strong, and it has the activity of degrading the film under ultraviolet and visible light.

[0033] (2) Same as step (2) of the above-mentioned Example 1, TiO with different Ce doping ratios added 2 composite film. The research shows that, in the same illumination time, the dop...

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Abstract

The invention discloses a rare earth modified photocatalyst and a degradable plastic film prepared by the rare earth modified photocatalyst and a preparation method thereof. The rare earth modified photocatalyst of the invention consists of lanthanon and titanium dioxide, and weight of the lanthanon is 0.1 to 10 percent of that of titanium elements. The rare earth modified photocatalyst is blended with polyolefin resin, then the degradable plastic film can be prepared, and the weight of the rare earth modified photocatalyst is 0.1 to 20 percent of that of the polyolefin resin. The visible light utilization ratio of the rare earth modified photocatalyst is improved by 50 percent, bactericidal rate reaches 70 percent, contact angle is less than 10 degrees, the effect of the degradable plastic film is significant, and degrade ratio can reach 20 to 60 percent. The raw materials of the rare earth modified photocatalyst are inexpensive and innoxious, the preparation method is simple, and the rare earth modified photocatalyst has the advantages of light conversion, visible light sensitization, hydrophilic and antifogging, dust proofing, etc.

Description

technical field [0001] The invention relates to the technical field of degradable plastic films, in particular to a rare earth modified photocatalyst, degradable plastic films and preparation technology. Background technique [0002] Because the film can play the role of heat preservation and mulching, antifreeze, moisture conservation, light adjustment, water saving, weeding and soil salinity control, and then promotes early maturity of crops, improves crop yield and quality, so it has become the world's food and economic crops. one of the effective ways. my country's film production and coverage area are roughly equivalent to 1.6 times the sum of other countries in the world; however, film coverage technology has brought huge economic benefits to agricultural production and income, but it also seriously pollutes the land. Due to the special national conditions of our country, it is quite difficult to recycle the domestic film, which has caused serious white pollution of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J21/06C08J5/18C08L23/06C08L23/12C08L25/06C08L27/06C08K3/24
CPCY02P20/52
Inventor 侯梅芳范艳宁万洪富黄兴文唐小燕
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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