Cerium-based metal organic framework for Cr (VI) detection, preparation method and application thereof

An organic framework and metal-based technology, which is applied in the field of optical sensing and achieves good application prospects, strong oxidase activity and good selectivity.

Active Publication Date: 2019-08-16
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a cerium-based metal-organic framework ...

Method used

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  • Cerium-based metal organic framework for Cr (VI) detection, preparation method and application thereof
  • Cerium-based metal organic framework for Cr (VI) detection, preparation method and application thereof
  • Cerium-based metal organic framework for Cr (VI) detection, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Preparation of cerium-based metal-organic framework

[0036] Dissolve 0.434g of cerous nitrate hexahydrate and 4.8g of sodium hydroxide in 20mL of ultrapure water, stir and mix for 30 minutes, place the mixed solution in an autoclave at 100°C for 24 hours, and after cooling to room temperature, the product Wash with ultrapure water and ethanol for three times, and then place in a vacuum oven at 60°C overnight to obtain CeO 2 Nanorods; 20mg CeO 2 The nanorods were mixed with 30 mL of DMF solution containing 1.4952 g of terephthalic acid, and placed in an autoclave at 70 °C for 12 hours. After cooling to room temperature, the product was washed with DMF and ethanol for three times, and then placed at 60 °C overnight in a vacuum oven to obtain a cerium-based metal-organic framework (CeO 2 NRs-MOF).

Embodiment 2

[0037] Example 2: Preparation of cerium-based metal-organic framework

[0038] Dissolve 0.434g of cerous nitrate hexahydrate and 4.34g of sodium hydroxide in 20mL of ultrapure water, stir and mix for 20 minutes, place the mixed solution in an autoclave at 95°C for 20 hours, and after cooling to room temperature, the product Centrifugal washing with ultrapure water and ethanol twice in sequence, and then placed in a vacuum oven at 50 °C for 12 hours to obtain CeO 2 Nanorods; 20mg CeO 2 The nanorods were mixed with 30 mL of DMF solution containing 1.4 g of terephthalic acid, and placed in an autoclave at 65 °C for 10 hours. After cooling to room temperature, the product was centrifuged twice with DMF and ethanol, and then placed at 60 ℃ in a vacuum oven for 12 hours to obtain a cerium-based metal-organic framework (CeO 2 NRs-MOF).

Embodiment 3

[0039] Example 3: Preparation of cerium-based metal-organic framework

[0040] Dissolve 0.434g of cerous nitrate hexahydrate and 5.208g of sodium hydroxide in 20mL of ultrapure water, stir and mix for 40 minutes, place the mixed solution in an autoclave at 105°C for 30 hours, cool to room temperature, and prepare the product Centrifugal washing with ultrapure water and ethanol four times in turn, and then placed in a vacuum oven at 70 °C for 24 hours to obtain CeO 2 Nanorods; 20mg CeO 2 The nanorods were mixed with 30 mL of DMF solution containing 1.6 g of terephthalic acid, and placed in an autoclave at 75 °C for 15 hours. After cooling to room temperature, the product was centrifuged and washed four times with DMF and ethanol, and then placed at 70 °C. ℃ in a vacuum oven for 24 hours to obtain a cerium-based metal-organic framework (CeO 2 NRs-MOF).

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Abstract

The invention relates to the technical field of optical sensing, and particularly discloses a cerium-based metal organic framework for Cr (VI) detection, a preparation method and application. The cerium-based metal organic framework employs a cerium dioxide nano-rod with mimic enzyme activity as a template and provides cerium ions as an ion center; then terephthalic acid is added for nucleation and growth to obtain the cerium-based metal organic framework. The cerium dioxide nano-rod is obtained by mixing cerium nitrate hexahydrate and sodium hydroxide for reaction and performing centrifugation, washing and vacuum drying; and the cerium-based metal organic framework is applied to detection of Cr (VI). The cerium-based metal organic framework is synthesized by applying a sacrificial template method for the first time, has higher oxidase activity and selectivity than those of a CeO2 nano material, achieves sensitive detection on Cr (VI), has the advantages of high sensitivity, good selectivity, simplicity and rapidness, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of optical sensing, and in particular relates to a cerium-based metal-organic framework for Cr(VI) detection, a preparation method and an application. Background technique [0002] Chromium is the 21st most abundant element in the earth's crust, and there are mainly two oxidation states of Cr(III) and Cr(VI) in the environment. Metal plating and processing, leather tanning, industrial cooling water preservatives, and wood preservative treatments can all lead to increased chromium concentrations in the environment. The two oxidation states of Cr have distinctly different chemical properties and human toxicity. Cr(III) is a trace element required by the human body and is less toxic. It can form trivalent cations (or hydrolysis products), which strongly bind to mineral surfaces and form metal hydroxides with limited solubility. Cr(VI) is usually used as a chromate oxyanion and is a known human respiratory car...

Claims

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Application Information

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IPC IPC(8): C08G83/00G01N21/31G01N21/77G01N23/2273
CPCC08G83/008G01N21/314G01N21/77G01N23/2273G01N2021/3155
Inventor 邱建丁王艺梁汝萍
Owner NANCHANG UNIV
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