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Preparation method of protonated titanate nanotubes and adsorption application of protonated titanate nanotubes to uranium and cesium

A technology of nanotubes and titanates, applied in chemical instruments and methods, adsorption water/sewage treatment, inorganic chemistry, etc., can solve the influence of hydrothermal temperature and pickling concentration on product morphology. Not studied in depth, not discussed Reaction conditions change the impact of product shape changes, etc., to achieve the effect of low modification cost, improved adsorption and removal ability and anti-interference ability, and uniform product shape

Inactive Publication Date: 2019-01-11
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the effects of changes in the preparation conditions of titanate nanomaterials (such as reaction temperature, pickling intensity, etc.) on its interlayer structure, chemical composition, appearance and adsorption performance have not yet been clarified. Material H + / Na + The change law of the ratio is not yet clear, and different H + / Na + Vital to the chemical composition and performance of the product
The Chinese invention patent "a titanate nanotube and its preparation method" with the publication number CN106564942A discloses a preparation method of a titanate nanotube. A sunflower-shaped nanotube is prepared by hydrothermal, vacuum activation and chemical vapor deposition. Titanate nanotubes, but the effects of hydrothermal temperature and acid concentration changes on the product morphology have not been studied in depth
The Chinese invention patent "a titanate nanotube and its preparation method and application" with the publication number CN102161504A discloses a preparation method of a titanate nanotube with a large specific surface and multi-layer walls. The titanate nanotube has remarkable It is characterized by its asymmetric structure, with three layers on one side and four layers on the other side of the tube wall, which can be applied to lithium battery electrode diaphragm materials, but no further research has been done on the prepared titanate nanotubes H + / Na + and chemical composition, and did not discuss the impact of product morphology changes caused by changes in reaction conditions
Moreover, the current applications of titanate nanotubes and their modified products as adsorbents are mainly concentrated on Pb in water. 2+ 、Cu 2 + 、Cd 2+ For the removal of heavy metal ions, there are few studies on the efficient adsorption of low-concentration radionuclide ions in the ocean, and the enrichment of low-concentration radionuclide ions from water puts forward higher requirements for the specific surface area and surface groups of materials.

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  • Preparation method of protonated titanate nanotubes and adsorption application of protonated titanate nanotubes to uranium and cesium
  • Preparation method of protonated titanate nanotubes and adsorption application of protonated titanate nanotubes to uranium and cesium
  • Preparation method of protonated titanate nanotubes and adsorption application of protonated titanate nanotubes to uranium and cesium

Examples

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Embodiment 1

[0028] Different H + / Na + The preparation method of the series protonated titanate nanotubes specifically comprises the following steps:

[0029] (1) Preparation of titanate nanotubes T by hydrothermal method

[0030] Measure 80mL NaOH solution (concentration 8mol / L) in conical flask, add the anatase TiO of 0.8g subsequently 2 Nano-powder, stir for 12 hours until completely mixed; after stirring, transfer the mixture to a polytetrafluoroethylene-lined stainless steel reactor, and place the reactor at 130°C for hydrothermal reaction for 6 hours;

[0031] After the hydrothermal reaction was completed, the reactor was taken out, and after cooling down to room temperature, the mixed solution was centrifuged at 4000r / min for 5 minutes to obtain a white solid; the white solid was washed with deionized water several times until the supernatant was neutral, and then washed with Disperse with ethanol, and finally dry in an oven at 60°C to obtain titanate nanotubes, denoted as T.

...

Embodiment 2

[0037] Influence of concentration change of NaOH solution on product properties during preparation

[0038] In this example, titanate nanotubes T were prepared in the same manner as in Example 1, except that the concentration of the NaOH solution used was increased to 13 mol / L. It is found through characterization that the specific surface area of ​​titanate nanotubes obtained in this example is changed from 203.2m in Example 1 2 / g increased to 332.4m 2 / g. It shows that the change of the concentration of NaOH solution used in the preparation process will affect the properties of the product. In a certain range, the NaOH solution increases, the greater the surface area of ​​the product.

Embodiment 3

[0040] Adsorption and removal of nuclides uranium and cesium by titanate nanotubes and their series of protonated modified products under different pH conditions

[0041] At a temperature of 25±2°C, 0.004 g of titanate nanotubes T and protonated titanate nanotubes H1, H2, and H3 prepared in Example 1 were sequentially added to four 50-mL centrifuge tubes, followed by 20 mL of initial Concentration of 10mg / L uranium, cesium standard solution (both dosage 0.2g / L). The pH of the reaction system in each centrifuge tube was controlled to be 3, 4, 5, 6, 7, and 8 respectively. Put the four centrifuge tubes in a shaker and vibrate for 1 hour; then take out the centrifuge tubes, and centrifuge each tube at 4000r / min for 5 minutes, take the supernatant to measure the content of uranium and cesium, and study the influence of different pH on the adsorption .

[0042] image 3 It is the influence curve of solution pH on the adsorption of nuclide ions by the titanate nanotubes and their ...

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Abstract

The invention relates to the field of ocean radionuclide contamination management and enrichment and detection and in particular relates to a preparation method of serial protonated titanate nanotubeswith different H<+> / Na<+> ratios and application of the protonated titanate nanotubes to rapid and efficient adsorption to remove low-concentration nuclide uranium and cesium ions in seawater. The titanate nanotubes are prepared by adopting a hydrothermal method and the content of H<+> in the titanate nanotubes is increased through protonated modification; the porosity and specific surface area of a material are increased; and the adsorption and removal capability of the titanate nanotubes on the low-concentration nuclide ions in the seawater is greatly improved. By adopting the preparation method provided by the invention, the application range of a titanate nanotube series material is expanded and technical supports are provided for adsorption and removal and rapid enrichment and detection of uranium and cesium nuclides in the seawater with a low radioactive level.

Description

technical field [0001] The invention relates to the field of marine radionuclide pollution control and enrichment detection, in particular to a method for preparing titanate nanotubes and a series of protonated modified products thereof, and using it as an adsorbent to quickly and efficiently remove seawater / wastewater Medium and low concentration nuclide uranium (UO 2 2+ ), cesium (Cs + ) ionic method. Background technique [0002] Under normal operation mode, nuclear power is a clean and environmentally friendly energy source, and it is an effective way for human beings to solve energy problems in the future. However, a large amount of nuclear waste water will be produced during the production and power generation of nuclear power plants, and an accident in a nuclear power plant will lead to serious consequences of nuclear leakage. Most of the radionuclides leaked in nuclear accidents enter the ocean through leakage and discharge, and most of the radioactive elements e...

Claims

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Application Information

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IPC IPC(8): B01J20/30B01J20/28C02F1/28B01J20/02C02F101/20C02F103/08
CPCB01J20/0262B01J20/28007C02F1/281C02F2101/006C02F2101/20C02F2103/08
Inventor 李晔朱利军李柏林王俞迪周育智
Owner WUHAN UNIV OF TECH
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