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BDD electrode and application used for online monitoring of heavy metal ions in water body

A technology of heavy metal ions and electrodes, which is applied to online monitoring of heavy metal ions in water, based on BDD electrodes for online monitoring of heavy metal ions in water. In the field of BDD electrodes, it can solve the problems that mercury film electrodes cannot have both green and long-term performance, and achieve the goal of overcoming two Sub-pollution and performance degradation, wide application range, high-precision effects

Inactive Publication Date: 2019-05-07
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention is to provide a BDD electrode to solve the problem that the mercury film electrode in the prior art cannot have both green and long-term performance when detecting the heavy metal content in water;

Method used

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  • BDD electrode and application used for online monitoring of heavy metal ions in water body
  • BDD electrode and application used for online monitoring of heavy metal ions in water body
  • BDD electrode and application used for online monitoring of heavy metal ions in water body

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Embodiment 1

[0044] The preparation method of the BDD electrode described in the present embodiment comprises the following steps:

[0045] (1) Pretreatment: First, the titanium plate substrate is polished smooth with sandpaper and polished to a mirror surface; then the sample is ultrasonically cleaned in acetone for 20 minutes and dried;

[0046] (2) Seed crystal: Finally, carry out ultrasonic seed crystal for 10 min in the ethanol suspension (concentration 2.4% w / w) containing diamond nanopowder (particle size 10nm) of the matrix sample, and after drying, set aside;

[0047] (3) Coating: Put the above-mentioned dried substrate into the reaction chamber for nucleation and growth of diamond: use H 2 will be dissolved with B 2 o 3 C 2 h 5 OH is brought into the reaction chamber for doping, control C / H to 2.4%, B / C to 6000ppm;

[0048] In the diamond nucleation stage, use Ta wire to provide heat source and control CH 4 :H 2 10:1000sccm, control air pressure 3KPa, deposition temperatur...

Embodiment 2

[0056] The preparation method of the BDD electrode described in the present embodiment comprises the following steps:

[0057] (1) Pretreatment: First, the titanium plate substrate is polished smooth with sandpaper and polished to a mirror surface; then the sample is ultrasonically cleaned in acetone for 20 minutes and dried;

[0058] (2) Seed crystal: Finally, carry out ultrasonic seed crystal for 10 min in ethanol suspension (2.3% w / w) containing diamond nanopowder (8nm) on the matrix sample, and after drying, set aside;

[0059] (3) Coating: Put the above-mentioned dried substrate into the reaction chamber for nucleation and growth of diamond: use H 2 will be dissolved with B 2 o 3 C 2 h 5 OH is brought into the reaction chamber for doping, control C / H to 2.3%, B / C to 5900ppm;

[0060] In the diamond nucleation stage, use Ta wire to provide heat source and control CH 4 :H 2 10:1000sccm, control air pressure 3KPa, deposition temperature 700℃, nucleation time 0.5h;

...

Embodiment 3

[0063] The preparation method of the BDD electrode described in the present embodiment comprises the following steps:

[0064] (1) Pretreatment: First, the titanium plate substrate is polished smooth with sandpaper and polished to a mirror surface; then the sample is ultrasonically cleaned in acetone for 20 minutes and dried;

[0065] (2) Seed crystal: Finally, carry out ultrasonic seed crystal for 10 min in ethanol suspension (2.5% w / w) containing diamond nanopowder (12nm) on the matrix sample, and after drying, set aside;

[0066] (3) Coating: Put the above-mentioned dried substrate into the reaction chamber for nucleation and growth of diamond: use H 2 will be dissolved with B 2 o 3 C 2 h 5 OH is brought into the reaction chamber for doping, control C / H to 2.5%, B / C to 6100ppm;

[0067] In the diamond nucleation stage, use Ta wire to provide heat source and control CH 4 :H 2 10:1000sccm, control air pressure 3KPa, deposition temperature 700℃, nucleation time 0.5h;

...

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Abstract

The invention belongs to the technical field of water body heavy metal monitoring, and particularly relates to a BDD electrode and an application used for online monitoring of heavy metal ions in a water body. The BDD electrode takes a titanium plate as a working electrode base body material, B2O3 is selected as a boron source, CH4 is used as a nucleation carbon source, C2H5OH is used as a growthcarbon source, and H2 is used as an etching gas to be prepared through hot wire chemical vapor deposition technology. The BDD electrode can simultaneously detect the mixed solution of Cd2+ and Pb2+, and has excellent detection precision and accuracy, the low detection limit and the high reproducibility of the BDD electrode ensure the wide application range and the high accuracy, and green and simultaneous detection of the Cd2+ and THE Pb2+ can be ensured. The BDD electrode can meet the requirement for long-acting use of green and simultaneous detection of an on-line monitoring system on the electrode, effectively overcomes the defect that an existing common mercury membrane electrode has secondary pollution and performance attenuation, and has the application potential of on-line monitoring of the heavy metal ions in water, especially the Cd2+ and the Pb2+.

Description

technical field [0001] The invention belongs to the technical field of heavy metal monitoring in water, specifically relates to a BDD electrode and its application for online monitoring of heavy metal ions in water, and further discloses a method for online monitoring of heavy metal ions in water based on the BDD electrode. Background technique [0002] On-line monitoring of heavy metal ions in the water environment is the only way to prevent water source pollution in rural areas. Unfortunately, the mercury membrane electrodes used in the current on-line monitoring system cannot meet the requirements of simultaneous green and long-term detection. A typical example is the heavy metal pollution event in water sources in rural areas of Hubei Province. Researchers from China University of Geosciences (Wuhan) investigated the status quo of heavy metal ion pollution in water sources in rural areas of Hubei Province with reference to the Hygienic Standards for Drinking Water (GB574...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/27G01N27/30G01N27/48
Inventor 于翔裴敬轩刘兴举张超
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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