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Preparation method and material of ferro-cerium composite oxide, and detection method of cadmium ions

A composite oxide and cadmium ion technology is applied in the field of iron-cerium composite oxide nanostructure materials, the preparation of iron-cerium composite oxide nanostructure materials, and the detection of trace cadmium ions in water environment, which can solve the problems of poor stability and sensitivity. Low cost, simple operation and high cost solution

Active Publication Date: 2019-09-06
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the existing technical problems, the present invention provides a preparation method of iron-cerium composite oxide and its material, and a detection method of cadmium ions, which solves the problems of low sensitivity and poor stability of detecting cadmium ions by using existing precious metals

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  • Preparation method and material of ferro-cerium composite oxide, and detection method of cadmium ions
  • Preparation method and material of ferro-cerium composite oxide, and detection method of cadmium ions
  • Preparation method and material of ferro-cerium composite oxide, and detection method of cadmium ions

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Embodiment 1

[0040] see figure 1 , this embodiment provides a method for preparing an iron-cerium composite oxide nanostructure material, which is used to prepare an iron-cerium composite oxide nanostructure material that can be used to detect trace amounts of cadmium ions in an aqueous environment. Wherein, the preparation method includes the following steps, namely step 1 to step 4.

[0041] Step 1, a certain molar ratio of Fe(NO 3 ) 3 9H 2 O and CeCl 3 ·7H 2 O was placed in deionized water to form a mixed solution 1, and the mixed solution 1 was stirred at 60°C. Among them, the stirring time can be 2h, so that Fe(NO 3 ) 3 9H 2 O and CeCl 3 ·7H 2 O is well dissolved in deionized water. It should be noted here that the corresponding molar ratio of Fe(NO 3 ) 3 9H 2 O and CeCl 3 ·7H 2 O is mixed so that the overall quantity ratio of Ce, Fe, and O molecules is the same or similar to the composition ratio of each element in the iron-cerium composite oxide. When actually selec...

Embodiment 2

[0060] see image 3 , this embodiment provides a method for detecting trace cadmium ions in water environment, which is used for detecting trace cadmium ions in water environment. Wherein, the detection method includes the following steps, namely step 1 to step 4.

[0061] Step 1. Prepare a certain amount of iron-cerium composite oxide nanostructure material through the preparation method of iron-cerium composite oxide nanostructure material in Example 1.

[0062]Step 2. Dissolve the iron-cerium composite oxide nanostructure material in ultrapure water to form a mixed solution 3, then absorb the suspension of the mixed solution 3 and drop-coat it on the glassy carbon electrode, and finally air-dry the modified glassy carbon electrode. In this embodiment, the mass of iron-cerium composite oxide nanostructure material in each mixed solution 3 is 3 mg, and the volume of ultrapure water is 3 ml. Before aspirating the suspension, the mixture 3 was ultrasonically treated for 10 mi...

Embodiment 3

[0070] This embodiment provides an iron-cerium composite oxide nanostructure material, which is prepared by the preparation method of the iron-cerium composite oxide nanostructure material in Example 1 and used in Example 2. Of course, in some other embodiments, the iron-cerium composite oxide nanostructure material is not limited to CeFe 2 o 5 material or CeFeO 3 The material can also be other iron-cerium composite oxide materials with different composition ratios.

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Abstract

The invention discloses a preparation method and a material of a ferro-cerium composite oxide, and a detection method of cadmium ions. The preparation method comprises the following steps of: placingFe(NO3)3.9H2O and CeCl3.7H2O with a certain molar ratio in deionized water to form a first mixed solution, and stirring the first mixed solution at 60 DEG C; adding citric acid to the first mixed solution to form a second mixed solution, and stirring the second mixed solution at 60 DEG C; drying the second mixed solution at 125 DEG C to obtain nitric acid-citric acid plural gel; and calcining thenitric acid-citric acid plural gel at 400 DEG C. The CeFe2O5 material prepared by the preparation method disclosed by the invention has very high sensitivity and a low detection limit, which is far lower than the standard value prescribed by the World Health Organization, so that the sensitivity and stability of the detection can be improved. A ferro-cerium composite oxide nanostructure material has simple operations in the preparation process, is low in cost, can be produced in large batches, and can also solve the problems of high cost and pollution in precious metal detection.

Description

technical field [0001] The present invention relates to a preparation method in the technical field of electrochemical analysis and detection, in particular to a preparation method of an iron-cerium composite oxide nanostructure material, and also to the iron-cerium composite oxide nanostructure material prepared by the preparation method, and also to a A method for the detection of trace cadmium ions in water environment. Background technique [0002] With the development of society and the advancement of science and technology, the problem of environmental pollution seems to be becoming more and more serious, especially heavy metal pollution. Due to the mining, smelting, and processing of heavy metals, many heavy metals such as lead, mercury, cadmium, and cobalt enter the atmosphere, water, and soil, causing serious environmental pollution. Untreated heavy metal sewage is directly or indirectly discharged into rivers, lakes, seas, or into the soil. Since heavy metal eleme...

Claims

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Application Information

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IPC IPC(8): G01N27/333G01N27/26
CPCG01N27/333G01N27/26
Inventor 崔康平代茹茹陈星王海波陈桂萍张乐泉吴玉程
Owner HEFEI UNIV OF TECH
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