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A kind of hydrothermal composite method of natural opal and tio2

A natural protein, hydrothermal technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. good, rich in resources, and excellent in visible light catalytic activity

Active Publication Date: 2019-06-07
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems that the previous composite method requires high grade of opal raw ore, and the raw ore needs to be pre-acid leached, otherwise it will easily change color after calcination. The obtained product retains opal and TiO while retaining the porosity of opal. 2 The iron-containing substances between the interfaces also enhance the visible light catalytic activity of anatase

Method used

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  • A kind of hydrothermal composite method of natural opal and tio2
  • A kind of hydrothermal composite method of natural opal and tio2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] a. Natural diatom opal raw ore is purified by flotation and sedimentation, then dried and ground. Weigh 1 g of diatom opal powder of 100 mesh, add 40 ml of titanium sulfate aqueous solution with a concentration of 0.3 mol / L, at this time the pH value of the system is maintained at about 2, and stir at room temperature for 30 hours.

[0026] b. The obtained slurry was placed in a closed reaction kettle lined with tetrafluoroethylene, and hydrothermally reacted in a thermostat at 180° C. for 0.5 hour. After cooling, NaOH solution with a concentration of 1 mol / L was added dropwise to adjust the pH of the system to 6, and stirred for 1 h.

[0027] c. The obtained slurry was placed in a closed reaction kettle again, and hydrothermally reacted in a thermostat at 140° C. for 24 hours. Cooled slurry, centrifuged to no SO 4 2- , dried to get natural opal and TiO 2 composite photocatalyst. The spectral absorption threshold of the catalyst reaches 445nm, which has been extend...

Embodiment 2

[0029] a. The raw ore of natural opal shale in the Nenjiang River Basin is taken, purified by flotation and sedimentation, and then dried and ground. Weigh 0.5g of 100-mesh opal shale powder, add 5.2ml of titanium sulfate aqueous solution with a concentration of 1mol / L, mix well and add 5ml of water to the system. At this time, the pH value of the system is stable at about 1.6-2. Hour.

[0030] b. The obtained slurry was placed in a closed reaction kettle lined with tetrafluoroethylene, and hydrothermally reacted in a thermostat at 110° C. for 1 hour. After cooling, NaOH solution with a concentration of 0.2 mol / L was added dropwise to adjust the pH of the system to 5, and stirred for 1 h.

[0031] c. The obtained slurry was placed in a closed reaction kettle again, and hydrothermally reacted in a constant temperature box at 110° C. for 72 hours. Cooled slurry, centrifuged to no SO 4 2- , dried to get natural opal and TiO 2 composite photocatalyst. Under the irradiation o...

Embodiment 3

[0033] a. Natural diatom opal raw ore is purified by flotation and sedimentation, then dried and ground. Weigh 1 g of 200 mesh diatom opal powder, add 34.4 ml of titanium sulfate aqueous solution with a concentration of 0.2 mol / L, at this time the pH value of the system is maintained at about 2, and stir at room temperature for 30 hours.

[0034] b. The obtained slurry was placed in a closed reaction kettle lined with tetrafluoroethylene, and hydrothermally reacted in a thermostat at 160° C. for 0.5 hour. After cooling, NaOH solution with a concentration of 0.5 mol / L was added dropwise to adjust the pH of the system to 5, and stirred for 1 h.

[0035] c. The obtained slurry was placed in a closed reaction kettle again, and hydrothermally reacted in a thermostat at 160° C. for 12 hours. Cooled slurry, centrifuged to no SO 4 2- , dried to get natural opal and TiO 2 composite photocatalyst. Under the irradiation of visible light, the catalyst can decolorize 83% of the 20mg / L...

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Abstract

The invention relates to a hydrothermal composite method of natural opal and TiO2, and belongs to the field of development and utilization of new mineral functional materials. This method uses cheap natural opal as raw material and uses a step-by-step hydrothermal method to convert the trace impurity iron that is difficult to remove from the raw opal ore into useful doping ions and introduce it into anatase TiO2, which not only solves the problem of discoloration due to calcination of the product problem, and the iron-containing substances remaining at the interface between opal and TiO2 also enhance the visible light catalytic activity of anatase. The raw opal ore used in this method does not require pre-acid treatment, and the resulting composite does not require subsequent calcination. The porosity of the mineral itself is maintained, and the enrichment and degradation of organic pollutants can be completed simultaneously. This method has low energy consumption, little pollution, cheap raw materials, abundant resources, good product whiteness, and excellent visible light catalytic activity. It is a photocatalytic composite material with excellent environmental purification function.

Description

technical field [0001] The present invention relates to a kind of natural opal and TiO 2 The hydrothermal composite method belongs to the field of development and utilization of new mineral functional materials. The obtained composite not only maintains the porosity of the mineral itself, but also has a significantly improved catalytic oxidation ability under visible light. It can realize the enrichment and degradation of organic pollutants under sunlight irradiation at the same time. It is a photocatalytic composite material with excellent environmental purification function. . Background technique [0002] Natural opal is based on hydrous SiO 2 Natural porous mineral as the main component, its activity is better than that of ordinary SiO 2 , and has the characteristics of small specific gravity, large porosity, strong adsorption, and good acid resistance, and is an excellent natural active porous material. According to different causes, it can be divided into two categ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745B01J21/08
CPCB01J21/08B01J23/745B01J37/10B01J35/39
Inventor 李芳菲蒋引珊薛兵吴杨超孟俊威谈修苑世盛冯君秋徐川王凯雯李永轩
Owner JILIN UNIV
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