Preparation method and application of titanium dioxide nano-rod growing on diatomite in situ

An in-situ growth and titanium dioxide technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of low, wasteful and reusable rates, limited adsorption capacity of micron adsorption materials, etc.

Active Publication Date: 2019-05-14
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that existing nano-adsorbents are easy to agglomerate, easily cause loss and waste, and the recycling rate is not high, while the adsorption capacity of micron-adsorbent materials is limited. The preparation method of agent, in this method, the precursor of titanium is grown into TiO in situ on the surface of diatom disc

Method used

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  • Preparation method and application of titanium dioxide nano-rod growing on diatomite in situ

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Preparation of titania nanorods grown in situ on diatomite:

[0031] (1) Drop 3ml of isopropyl titanate into 10ml of ethanol and stir magnetically for 30min;

[0032] (2) Measure 13.5g of concentrated hydrochloric acid and drop it into the solution, and weigh 0.5g of sodium dodecylbenzenesulfonate, 0.6g of ammonium oxalate, and 2g of diatomaceous earth into the solution, stir magnetically until uniform, and then continue to add 15ml deionized water, stir well;

[0033] (3) Transfer the above mixed solution into a 50ml reaction kettle lined with polytetrafluoroethylene, seal it tightly, and put it in a vacuum drying oven at 150°C for 8 hours;

[0034] (4) Centrifuge the product obtained in step (3) for solid-liquid separation, and centrifuge and wash the obtained solid product three times with absolute ethanol and deionized water respectively, then put it in an oven and dry it at 60°C for 12 hours to obtain the target product silicon In situ growth of titania nanorods ...

Embodiment 2

[0038] Preparation of titania nanorods grown in situ on diatomite:

[0039] (1) Weigh 1g of titanium nitride and add it to 10ml of ethanol, ultrasonic for 30min until uniform dispersion;

[0040] (2) Measure 15g of concentrated hydrochloric acid and drop it into the solution, and weigh 0.3g of sodium dodecylbenzenesulfonate, 0.5g of ammonium oxalate, and 2g of diatomaceous earth into the solution respectively, stir magnetically until uniform, and then continue to add 15ml Deionized water, stir well;

[0041] (3) Transfer the above mixed solution into a 50ml reaction kettle lined with polytetrafluoroethylene, seal it tightly, and put it in a vacuum drying oven at 120°C for 10h;

[0042] (4) Centrifuge the product obtained in step (3) for solid-liquid separation, and centrifuge and wash the obtained solid product three times with absolute ethanol and deionized water respectively, then put it in an oven and dry it at 60°C for 12 hours to obtain the target product silicon In sit...

Embodiment 3

[0046] Preparation of titania nanorods grown in situ on diatomite:

[0047] (1) Drop 3ml of isopropyl titanate into 10ml of ethanol and stir magnetically for 30min;

[0048] (2) Measure 15g of concentrated hydrochloric acid and drop it into the solution, and weigh 0.5g of cetyltrimethylammonium bromide, 0.5g of ammonium oxalate, and 2g of diatomaceous earth and add them into the solution respectively, stir magnetically until uniform, and then continue Add 15ml deionized water and stir well;

[0049] (3) Transfer the above mixed solution into a 50ml reaction kettle lined with polytetrafluoroethylene, seal it tightly, and put it in a vacuum drying oven at 150°C for 8 hours;

[0050] (4) Centrifuge the product obtained in step (3) for solid-liquid separation, and centrifuge and wash the obtained solid product three times with absolute ethanol and deionized water respectively, then put it in an oven and dry it at 60°C for 12 hours to obtain the target product silicon In situ gro...

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Abstract

The invention discloses a preparation method and the application of titanium dioxide nano-rod growing on diatomite in situ. The TiO2 nano-rod grows on the surface of the diatomite in situ by a hydrothermal method, wherein titanium nitride or isopropyl titanate serves as a titanium source, ammonium oxalate serves as a depositing agent, and hexadecyl trimethyl ammonium bromide or sodium dodecyl benzene sulfonate serves as a soft template agent. A large amount of oxygen defects exist on the surface of the crystallized TiO2 and the crystallized TiO2 can interact with the diatomite with a large amount of silicon hydroxyl under the electrostatic attraction, so that the heterogeneous nucleation growth of the TiO2 on the surface of the diatomite is promoted. The TiO2 crystal directionally grows tobe a nano-rod structure under the structure-directing action of the soft template agent. A large amount of active hydroxyl groups and unsaturated bonds are increased on the surface of the diatomite under the existence of the TiO2 nano-rod, so that active adsorption sites on the surface are increased, the specific surface area is enlarged and the adsorption rate of an adsorbent is greatly increased. The adsorbent can repeatedly adsorb chromium ions after being eluted by an alkaline solution, and the adsorption efficiency is not changed basically.

Description

technical field [0001] The invention relates to the technical fields of environmental protection and material science, in particular to a preparation method and application of diatomite in-situ grown titanium dioxide nanorods. Background technique [0002] With the development of science and technology and industry, the content of heavy metals in the environment has increased, exceeding the normal range, causing great harm to the environment and organisms. At the same time, they are easy to accumulate through the food chain and directly threaten human health. Chromium is recognized as one of the most toxic pollutants among heavy metal pollutants, so its effective treatment has attracted more and more attention. Chromium mainly exists in the form of Cr(Ⅲ) and Cr(Ⅵ) in industrial wastewater, among which Cr(Ⅵ) is the main environmental pollutant, and its toxicity is 100 times that of Cr(Ⅲ), so the pollution of Cr(Ⅵ) Governance has become a research hotspot. At present, the tr...

Claims

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Application Information

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IPC IPC(8): B01J20/28B01J20/14B01J20/30C02F1/28C02F101/22
Inventor 郑玉婴张炜坚
Owner FUZHOU UNIV
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