Photoelectrocatalysis method for determining chemical oxygen demand

A chemical oxygen demand, photoelectric catalysis technology, applied in electrochemical variables of materials, chemical analysis using catalysis, measurement devices, etc. problem, high accuracy, good conductivity effect

Inactive Publication Date: 2005-11-16
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there are no toxic and harmful reagents in this measurement method, the pollution problem in COD measurement is fundamentally solved, but the photoelectrocatalytic working electrode anode used in this measurement method is deposited (coated) nano-TiO on the surface of conductive glass. 2 The thin film method is obtained, the preparation process of this thin film is not only complicated, but also the bonding force between the thin film and the conductive glass is low, the thin film is easy to crack and fall off, the electron transfer resistance in the thin film is large, and the photoelectric catalytic reaction efficiency is low, thus affecting the stability of the method sex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The photoelectrocatalytic reaction for measuring COD is carried out in a thin-layer microreactor, with metal titanium as the anode, the diameter of the tube on the surface of the titanium substrate is about 60-90nm, and the tube length is about 400nm TiO 2 The nanotube array film is used as a photocatalyst, the metal platinum wire mesh is used as the counter electrode, and Ag / AgCl is used as the reference electrode. The space between the thin-layer microreactors is 0.1 mm, and the area of ​​each side of the tank is 0.7 cm. 2 , with sodium nitrate as the electrolyte, inject different COD standard solutions into the thin-layer microreactor, apply a bias voltage of 0.3V on the anode, and at the same time, ultraviolet light is irradiated to the other side of the tank through the quartz window reserved on one side of the tank wall TiO in 2 On the nanotube array film, read the coulombic electricity value consumed by the complete photocatalytic oxidation of organic matter ever...

Embodiment 2

[0015] The photoelectrocatalytic reaction for measuring COD is carried out in a thin-layer microreactor, with metal titanium as the anode, the diameter of the tube on the surface of the titanium substrate is about 20-40nm, and the tube length is about 600nm TiO 2 The nanotube array film is the photocatalyst, the metal platinum sheet is used as the counter electrode, and the Ag / AgCl is used as the reference electrode. The spacing between the thin-layer microreactors is 0.2 mm, and the area of ​​each side of the tank is 0.2 cm. 2 , with sodium nitrate as the electrolyte, inject different COD standard solutions into the thin-layer microreactor, apply a bias voltage of 0.5V on the anode, and at the same time, ultraviolet light is irradiated to the other side of the tank through the quartz window reserved on one side of the tank wall TiO in 2 On the nanotube array film, read the Coulomb power value consumed by the complete photocatalytic oxidation of organic matter every 5 minutes,...

Embodiment 3

[0017] The photoelectrocatalytic reaction for measuring COD is carried out in a thin-layer microreactor, with metal titanium as the anode, the diameter of the tube on the surface of the titanium substrate is about 40-60nm, and the tube length is about 500nm TiO 2 The nanotube array film is the photocatalyst, the metal platinum wire mesh is used as the counter electrode, and the Ag / AgCl is used as the reference electrode. The spacing between the thin-layer microreactors is 0.1 mm, and the area of ​​each side of the tank is 0.9 cm. 2 , with sodium sulfate as the electrolyte, inject different COD standard solutions into the thin-layer microreactor, apply a bias voltage of 0.3V on the anode, and at the same time, ultraviolet light is irradiated to the other side of the tank through the quartz window reserved on one side of the tank wall TiO in 2 On the nanotube array film, read the Coulomb electricity value consumed by the complete photocatalytic oxidation of organic matter every ...

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Abstract

A method of using photoelectric catalysis to detect chemical oxygen demand includes carrying out photoelectric catalytic reaction in a thin microreactor, using Ti as positive electrode, using TiO2 nanotube array film on metal Ti as light catalyst, using metal Pt as pair electrode and Ag / Ag CI as reference electrode, using inert inorganic salt as electrolyte, determining COD value by measuring Coulomb electricity value at time when organic substance of water sample in reactor is totally catalyzed and oxidized.

Description

technical field [0001] The invention relates to a method for measuring chemical oxygen demand by photoelectric catalysis, in particular to a method using TiO 2 The invention relates to a method for measuring water quality COD (chemical oxygen demand) by photoelectrocatalysis with a nanotube array electrode, belonging to the technical field of environmental monitoring. Background technique [0002] At present, the methods for COD determination mainly include standard method (that is, potassium dichromate method), coulometric method and photometric method. Most of these methods need to consume a large amount of potassium dichromate, concentrated sulfuric acid and expensive silver sulfate in the operation process. At the same time, in order to eliminate the interference of chloride ions, it is also necessary to add toxic mercury sulfate for masking, and high temperature digestion is required. The reflux time is long, the operation process is cumbersome, the measurement time is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/42
Inventor 周保学蔡伟民
Owner SHANGHAI JIAO TONG UNIV
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