GB/T 39716-2020Test method for air-purification performance of photocatalytic materials and products—Removal of nitric oxide (English PDF)

1 Scope

This standard specifies the principles, test devices, analysis methods and tests of photocatalytic materials and products to remove nitrogen oxides from the air:

Reports and other content:

This standard is applicable to the test of the removal of nitrogen oxides in the air by photocatalytic materials and products:

2 Normative references

The following documents are indispensable for the application of this document: For dated reference documents, only the dated version applies to this article

Pieces: For undated references, the latest version (including all amendments) applies to this document:

GB/T 6682 Analytical laboratory water specifications and test methods

GB/T 6920 Determination of pH value of water quality by glass electrode method

GB/T 8170-2008 Numerical rounding rules and the expression and determination of limit values

GB/T 11605 Humidity measurement method

GB/T 14642 Determination of fluorine, chlorine, phosphate, nitrite, nitrate and sulfate in industrial circulating cooling water and boiler water

Sub-chromatography

GB/T 30706 Test method and evaluation of antibacterial performance of photocatalytic antibacterial materials and products under visible light irradiation

GB/T 30809 UV light source for photocatalytic material performance testing

3 Terms and definitions

The following terms and definitions apply to this document:

3:1

Photocatalytic materials and products

Materials containing or using photocatalysts and having photocatalytic properties and various application products made of photocatalytic materials:

3:2

Zero-calibrationgas

High-purity air with pollutant content less than 0:01mL/m3:

4 Principle of the method

The sample made of photocatalytic material is placed in a flow photocatalytic reactor, and air containing nitric oxide (NO) pollutants is passed through:

After light irradiation, the reaction occurs, and the NO adsorbed on the surface is partially oxidized into nitrate, and part is converted into nitrogen dioxide (NO2), and the net is removed

The amount of addition characterizes the air purification ability of the sample: Among them, NO and NO2 are tested by chemiluminescence method, nitrate ion is eluted with pure water,

Sub-chromatographic determination:

Note: The net removal of nitrogen oxides (NOx) is calculated by subtracting the NO2 production from the NO removal: