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Visible-light response type nanometer TiO2/starch composite membrane, preparation method and application thereof

A starch composite film, visible light technology, applied in application, food preservation, fruit and vegetable preservation, etc., can solve the problems of narrow spectral response range, difficult application in the field of fruit and vegetable storage and packaging, and difficult powder recovery, etc., to improve mechanical properties and water resistance. , Good visible light response activity, long-lasting photocatalytic performance

Inactive Publication Date: 2015-05-20
SOUTH CHINA AGRI UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

But pure nano TiO 2 There are still some defects in the actual application process: first, the band gap is wide and the spectral response range is narrow, and only 7% of the solar energy can be used for ultraviolet light; the second is the low quantum efficiency, which inhibits its photocatalysis of organic matter. Degradation efficiency
Nano-TiO 2 Powder is difficult to recycle, easy to agglomerate and low utilization rate is the key to limit its practical application
At present, most of the TiO 2 Loaded on the surface of glass, carbon fiber, honeycomb ceramics, wire mesh, etc., but these methods mainly rely on adsorption loading, TiO 2 Easy to fall off, and difficult to apply in the field of fruit and vegetable storage packaging
TiO 2 Composite with PE, PVC, chitosan, soybean protein and other polymers to obtain a composite film material with antibacterial properties, nano-TiO 2 It can be uniformly dispersed in the polymer matrix, and the load is firm, and it has potential application prospects in the field of fruit and vegetable storage and packaging, but unmodified nano-TiO 2 Composite membranes composed of polymers do not have photocatalytic properties under visible light, and the nanoparticles may be covered by polymer materials, which greatly reduces their antibacterial properties

Method used

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  • Visible-light response type nanometer TiO2/starch composite membrane, preparation method and application thereof
  • Visible-light response type nanometer TiO2/starch composite membrane, preparation method and application thereof
  • Visible-light response type nanometer TiO2/starch composite membrane, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Visible light-responsive modified nano-TiO 2 Preparation: Weigh 1.082g ammonium heptamolybdate (according to the mole percentage of Mo element in ammonium heptamolybdate and Ti element in titanium dioxide is 0.5%) and 0.015g sodium dodecylsulfonate (SDS) into a beaker , add 100mL of distilled water, and make it fully dissolved by magnetic stirring. Then weigh 2g nano-TiO 2 P25 (P25 powder from Germany’s Degussa branch) was slowly added into the beaker, stirred magnetically for 2 hours, then dispersed ultrasonically for 40 minutes, and distilled under reduced pressure for 30 minutes with a rotary evaporator at a vacuum degree of 0.1Mpa and a water bath temperature of 60°C, and then placed Dry in an oven at 85°C for 12 hours. Put the dried sample in an agate mortar and grind it continuously for 30 minutes, put the ground sample into a muffle furnace for calcination at 600°C for 2 hours, and obtain a visible light-responsive modified nano-TiO 2 (Mo-P25 powder), its ...

Embodiment 2

[0034] (1) Visible light-responsive modified nano-TiO 2 Preparation: Weigh 4.326g of ammonium heptamolybdate (according to the mole percentage of Mo element in ammonium heptamolybdate and Ti element in titanium dioxide is 2%) and 0.013g SDS into a beaker, add 100mL of distilled water, through magnetic Stir to fully dissolve. Weigh again 2.017g nanometer TiO 2 (P25 powder from Germany’s Degussa branch) was slowly added to the beaker, stirred magnetically for 2 hours, then dispersed ultrasonically for 40 minutes, and distilled under reduced pressure for 30 minutes with a rotary evaporator at a vacuum degree of 0.1Mpa and a water bath temperature of 60°C, and then placed in Dry in an oven at 85°C for 12h. Put the dried sample into an agate mortar and grind it continuously for 30 minutes, then put the ground sample into a muffle furnace for calcination at 500°C for 2 hours to obtain a visible light-responsive modified nano-TiO 2 (Mo-P25 powder).

[0035] (2) Preparation of com...

Embodiment 3

[0041] (1) Visible light-responsive modified nano-TiO 2 Preparation: Weigh 1.732g ammonium heptamolybdate (according to the mole percentage of Mo element in ammonium heptamolybdate and Ti element in titanium dioxide is 0.8%) and 0.014g sodium dodecylsulfonate (SDS) into a beaker , add 100mL of distilled water, and make it fully dissolved by magnetic stirring. Weigh 2.008g nanometer TiO 2 (P25 powder from Germany’s Degussa branch) was slowly added into the beaker, stirred magnetically for 2 hours, then dispersed ultrasonically for 40 minutes, and distilled under reduced pressure for 30 minutes with a rotary evaporator at a vacuum degree of 0.1Mpa and a water bath temperature of 60°C, and then placed in Dry in an oven at 85°C for 12h. Put the dried sample into an agate mortar and grind it continuously for 30 minutes, then put the ground sample into a muffle furnace for calcination at 500°C for 2 hours to obtain a visible light-responsive modified nano-TiO 2 (Mo-P25 powder). ...

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Abstract

The invention belongs to the field of agricultural product processing and storing technologies and methods, and particularly discloses a visible-light response type nanometer TiO2 / starch composite membrane, and a preparation method and application of the visible-light response type nanometer TiO2 / starch composite membrane. The preparation method of the visible-light response type nanometer TiO2 / starch composite membrane includes the following steps: (1) processing ammonium heptamolybdate and nanometer TiO2 (nanometer P25 powders produced by German Degussa) through stirring, ultrasound, rotary steaming, drying, grinding and roasting to obtain modified nanometer TiO2 with visible-light catalytic activity; (2) processing corn esterified starch, the modified nanometer TiO2 and glycerol through stirring, ultrasound, heating to form a membrane, drying and membrane uncovering to obtain a starch composite membrane mixed with the modified nanometer TiO2; and (3) using the modified TiO2 to prepare suspension liquid, soaking the composite membrane into the suspension liquid, drawing out the composite membrane after soaking, drying the composite membrane, and obtaining the visible-light response type nanometer TiO2 / starch composite membrane.

Description

technical field [0001] The invention belongs to the technical field of agricultural product processing and storage, and in particular relates to a visible light-responsive nano-TiO 2 / starch composite film and its preparation method and application. technical background [0002] my country is a big producer of fruits and vegetables, but due to backward preservation technology, the annual loss rate of fruits and vegetables reaches more than 30%, causing huge economic losses. The preservation period of fruits and vegetables is not long, and they are perishable and deteriorated. There are two main reasons. Ethylene can increase the intensity of respiration, enhance the activity of metabolic enzymes, accelerate the increase of membrane permeability and the loss of cell compartmentation. When the ethylene concentration in the storage environment exceeds the threshold concentration of fruits and vegetables (0.5-1mg / kg), it will promote the softening of fruits and the yellowing o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L3/06C08K9/02C08K3/22A23B7/157
Inventor 宋贤良叶盛英张建广罗树灿张静
Owner SOUTH CHINA AGRI UNIV
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