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An Electrochemical Method for Quantitative Detection of Cr(vi) in Water

A quantitative detection and electrochemical technology, applied in the field of electroanalytical chemistry, can solve problems such as low reserves, poor product performance and stability, and high cost of use

Active Publication Date: 2022-05-10
HEBEI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Precious metal materials have high sensitivity and reproducibility, but their reserves in the earth's crust are low, and the cost of use is high; while the synthesis level and stability of carbon materials are uneven, resulting in poor product performance and stability

Method used

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  • An Electrochemical Method for Quantitative Detection of Cr(vi) in Water
  • An Electrochemical Method for Quantitative Detection of Cr(vi) in Water
  • An Electrochemical Method for Quantitative Detection of Cr(vi) in Water

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Embodiment Construction

[0018] (1) Preparation of catalyst: Utilize analytical balance to weigh 240mg, 80mg and 30mg of Na respectively 2 MoO 4 2H 2 O, FeCl 2 4H 2 O,1,3-bis(4-pyridyl)propane was dispersed in 10 mL of distilled water, and then 2 mL of absolute ethanol and 0.5 mL of H 3 PO 4 , stirred at room temperature for 0.5 h and adjusted the pH. Finally, the mixed solution was put into a 25mL autoclave, heated in an oven at 160°C for 5 days, and then slowly lowered to room temperature, and the orange-red crystalline compound 1 was obtained after washing the solid matter.

[0019] (2) Preparation of modified electrode: 5 mg of compound 1 and 10 mg of carbon powder were mixed in Nafion solution (0.5 mL, 0.5%). After the mixture was ultrasonically dispersed for 2 h, 10 μL of the supernatant was drop-coated on the surface of the glassy carbon electrode. To obtain compound 1 / carbon powder composite modified electrode (abbreviated as 1-GCE).

[0020] (3) Determination of Cr(VI) electrochemical ...

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Abstract

The invention discloses an electrochemical method for quantitatively detecting Cr(VI) in water bodies. The molybdophosphate electrocatalyst uses Na 2 MoO 4 2H 2 O, FeCl 2 4H 2 O, 1,3‑bis(4‑pyridyl)propane (bpp), absolute ethanol and H 3 PO 4 It is prepared for the hydrothermal reaction of raw materials; then the electrocatalyst / carbon powder modified glassy carbon electrode is used as a working electrode, and the Cr(VI) in the water phase is quantitatively detected by cyclic voltammetry and chronoamperometry. The method of the invention has simple operation, low cost and no environmental pollution. The prepared electrocatalytic material can effectively detect Cr(VI), the detection limit of Cr(VI) is as low as 0.009ppm, and the method has high stability and selectivity. Compared with the current technology, the amount of catalyst is less, green and efficient, the synthesis cost is low, and the response process is sensitive.

Description

technical field [0001] The invention relates to an electrochemical method for quantitatively detecting Cr(VI) in water bodies, comprising novel {M(P 4 Mo 6 ) 2 The invention discloses a preparation method of}-based phosphomolybdate electrocatalyst, which belongs to the technical field of electroanalytical chemistry. Background technique [0002] Heavy metal ions have serious damage to the aquatic ecological environment. Due to the enrichment of heavy metal ions in organisms and the characteristics of non-natural degradation, they pose a serious threat to human health. Chromium has a rich oxidation state: metal chromium is chemically stable and can be electroplated on metal surfaces to prevent corrosion, mainly used in tableware, water pipes, etc.; and the ionic state will show different physiological activities to the human body: Cr(III ) is an essential trace element for the human body, which can participate in the metabolism of the human body, but Cr(VI) is a highly to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/19G01N27/26
CPCB01J27/19B01J35/0033G01N27/26
Inventor 韩占刚辛兴马媛媛
Owner HEBEI NORMAL UNIV