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Laminated composite material of anatase and montmorillonite and preparation method thereof

A composite material and montmorillonite micro-layer technology, applied in the field of mineral-based composite materials, can solve problems such as poor crystallinity, reduce difficulty, improve adsorption performance, and avoid the use of organic precursors and organic modifiers. Effect

Active Publication Date: 2017-12-15
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention overcomes the problems that anatase cannot fully enter the interlayer of montmorillonite and poor crystallinity in the existing synthesis technology. Cost-effective TiO with widely adjustable anatase content 2 / Montmorillonite laminated composite photocatalytic functional material

Method used

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  • Laminated composite material of anatase and montmorillonite and preparation method thereof
  • Laminated composite material of anatase and montmorillonite and preparation method thereof
  • Laminated composite material of anatase and montmorillonite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028](1) Get 3g sodium montmorillonite and add 600mL deionized water to make 0.5wt% sodium montmorillonite suspension, then adjust the pH value of montmorillonite suspension to 9 with ammonia water, and carry out 2h Stir magnetically to obtain a montmorillonite suspension in which the microplatelets are fully opened.

[0029] (2) Take 3 g of titanium sulfate and add 42 mL of deionized water to make a solution, and then add ammonia water dropwise to adjust its pH value to 6. At this time, the titanium salt is hydrolyzed to form a white precursor slurry. Then magnetically stir for 30 min.

[0030] (3) under stirring, the white slurry generated in step 2 is added dropwise to the montmorillonite suspension obtained in step 1, and the pH of the above-mentioned mixed liquid is readjusted to 3 with 25% dilute sulfuric acid solution, and then Magnetic stirring was performed for 1 h.

[0031] (4) Put the mixed solution in step 3 into a polytetrafluoroethylene-lined stainless steel r...

Embodiment 2

[0034] (1) Get 3g sodium montmorillonite and add 150mL deionized water to make 2wt% sodium montmorillonite suspension, then adjust the pH value of montmorillonite suspension to 8 with ammonia water, and carry out 2h magnetic Stir to obtain a montmorillonite suspension in which the microplatelets are fully opened.

[0035] (2) Take 9 g of titanium sulfate and add 378 mL of deionized water to form a solution, then add NaOH solution dropwise to adjust its pH value to 7, and then the titanium salt is hydrolyzed to form a white precursor slurry. Then magnetically stir for 30 min.

[0036] (3) under stirring, the white slurry generated in step 2 is added dropwise to the smectite suspension obtained in step 1, and the pH of the above mixed liquid is readjusted to 5 with 25% dilute sulfuric acid solution, after that Magnetic stirring was performed for 1 h.

[0037] (4) Put the mixed solution in step 3 into a polytetrafluoroethylene-lined stainless steel reaction kettle, and keep it ...

Embodiment 3

[0040] (1) Get 3g sodium montmorillonite and add 1500mL deionized water to make 0.2wt% sodium montmorillonite suspension, then adjust the pH value of montmorillonite suspension to 11 with ammonia water, and carry out 2h Stir magnetically to obtain a montmorillonite suspension in which the microplatelets are fully opened.

[0041] (2) Take 3 g of titanium sulfate and add 42 mL of deionized water to form a solution, then add NaOH solution dropwise to adjust its pH value to 10, and then the titanium salt is hydrolyzed to form a white precursor slurry. Then magnetically stir for 30 min.

[0042] (3) under stirring, the white slurry generated in step 2 is added dropwise to the smectite suspension obtained in step 1, and the pH of the above-mentioned mixed liquid is readjusted to 4 with 25% dilute sulfuric acid solution, and then Magnetic stirring was performed for 1 h.

[0043] (4) Put the mixed liquid in step 3 into a polytetrafluoroethylene-lined stainless steel reaction kettle...

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Abstract

The invention belongs to the field of mineral-based composite materials, and particularly relates to a laminated composite material of anatase and montmorillonite obtained from the process of regulating montmorillonite micro layer recombination by means of an acid-base environment, and a preparation method thereof. Firstly, a titanium-containing precursor slurry with the pH value of 6-10 is dropped into an alkaline dispersion liquid of sodium-modified montmorillonite, then the pH value of the system is adjusted to be 3-6, a hydrothermal reaction is conducted at 120-220 DEG C so as to realize the crystallization of titanium oxide and the laminated and alternated assembly of montmorillonite microlayers and anatase, and the obtained composite has excellent catalytic and adsorption functions. The method has the advantages that the process is simple, raw materials are cheap, no organic additive or organic titanium source is used, calcination is not needed, the environmental cost is low, the cost performance of the product is high, large-scale industrial production can be realized, and the obtained product has broad application prospects in the fields like catalysis, adsorption and sewage treatment.

Description

technical field [0001] The invention belongs to the field of mineral-based composite materials, and relates to a layered composite photocatalytic functional material of anatase and montmorillonite and a preparation method thereof. A method for realizing stacked assembly of anatase titanium oxide and montmorillonite. Background technique [0002] Anatase-type titanium dioxide has a good photocatalytic degradation of organic pollutants. However, nano-scale anatase-type titanium dioxide powder has poor dispersion and is difficult to recycle, so it generally needs to be used after immobilization. The surface of natural silicate minerals with a layered structure generally has the opposite charge to that of titanium oxide particles, so it is easier to achieve a firm combination of anatase and the carrier. Among them, the 2:1 layered clay minerals represented by montmorillonite, due to the good dispersion of the aqueous phase and the adjustable lamellar spacing, so the montmorillo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/16B01J37/03B01J37/10C02F1/30C02F101/38
CPCC02F1/30B01J21/16B01J37/038B01J37/10C02F2305/10C02F2101/308B01J35/39
Inventor 李芳菲霍明远薛兵蒋引珊夏茂盛郭宏刚巨昊
Owner JILIN UNIV
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