Experimental device for measuring formaldehyde adsorption property of adsorbent and measuring method thereof

Abstract

The invention relates to an experimental device for measuring the formaldehyde adsorption property of adsorbent and a measuring method thereof, belonging to the field of indoor environment measurement. The experimental device comprises a thermostatic waterbath being capable of setting the temperature, a compressed gas cylinder for providing carrier gas, a primary and bypass path flow controller for controlling and measuring air flow, a gas-washing bottle containing distilled water, an environmental chamber provided with an outer housing, an acousto-optical gas analyzer and a display; a gas inlet and a gas outlet are arranged on the opposite lateral walls of the environmental chamber, and a stirring fan and a sampling hole are arranged at the top of the environmental chamber. And the acousto-optical gas analyzer is connected with the gas inlet and the gas outlet through pipelines. An experimental method utilizes the acousto-optical gas analyzer to detect the formaldehyde equilibrium concentration in the blank environmental chamber without the adsorbent and the environmental chamber with the adsorbent on line at the real time and obtains the formaldehyde adsorption property of the adsorbent by calculation. The experimental device and the measuring method thereof can control the temperature and the moisture better, and has simple and convenient operation and higher precision and reliability.

Description

technical field [0001] The invention belongs to the field of indoor environment inspection, and in particular relates to an experimental device for measuring the formaldehyde adsorption performance of an adsorbent and a measuring method thereof. Background technique [0002] Formaldehyde is one of the main indoor pollutants, and it has been identified as a carcinogen by the World Health Organization (WHO). The main sources of indoor formaldehyde are decorative materials such as plywood, particleboard, and fiberboard. The researchers proposed to add adsorbents to building materials to control the source emission of formaldehyde. The premise is that the adsorbents have excellent adsorption properties for formaldehyde. The separation coefficient is a parameter that characterizes the adsorption performance of the adsorbent. Generally speaking, the methods for determining the separation coefficient of adsorbents can be roughly divided into two categories: dynamic methods and st...

AI Technical Summary

Problems solved by technology

However, the VOCs that have been tested in the literature exist in a liquid state at normal temperature and pressure, and the injected quality can be easily determined by measuring the volume with a syringe, while formaldehyde does not exist in a liquid state at normal temperature and pressure (boiling point -21 ° C), which gives Determining the amount of formaldehyde to inject presents difficulties

Traditional methods for testing formaldehyde, such as spectrophotometry, have the disadvantages of complex operation, time-consuming, and large human error

At the same time, the temperature and humidity of the environment will also affect the formaldehyde adsorption performance of the adsorbent, and the existing experimental devices cannot control the temperature and humidity well.

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