Preparation method of efficient adsorbent for gaseous mercury sampling

Abstract

The invention relates to a preparation method of an efficient adsorbent for gaseous mercury sampling, and particularly relates to a preparation method of the efficient adsorbent for gaseous mercury sampling. According to the invention, except halogen and compounds thereof, iodine bromide and dimercaptosuccinic acid are used for modifying; by relevant experiment, the result shows that activated functional groups of carbonyl, halogen and the like which are increased on the surface of modified activated carbon are beneficial to chemical adsorption of the element mercury and divalent mercury, and especially a symmetrical stable structure formed by the combination of dimercaptosuccinic acid and mercury enables the adsorption capability of the modified activated carbon on mercury to be improved greatly.

Description

technical field [0001] The invention relates to a preparation method of a high-efficiency adsorbent, in particular to a preparation method of a high-efficiency adsorbent for gaseous mercury sampling. Background technique [0002] Coal is the most important primary energy in our country. In 2009, the coal output was close to 3 billion tons. The consumption of a large amount of coal has caused serious harm to the living environment of human beings. Due to its special physical and chemical properties and strong toxicity, mercury has become a pollutant of global concern. The use of coal is the main source of mercury in the atmosphere, followed by chlor-alkali industry, waste incineration and other sources. [0003] Mercury exists in the form of metallic mercury, inorganic mercury and organic mercury in nature. Inorganic mercury has monovalent and divalent compounds. Organic mercury includes methylmercury, dimethylmercury, phenylmercury and methoxyethylmercury. Different forms o...

AI Technical Summary

Problems solved by technology

[0009] ① Wet monitoring is to absorb mercury through the absorption solution. If you want to measure mercury in different forms, you need a series of different solutions for separate adsorption. Use cold atomic absorption method or cold atomic fluorescence method for analysis. Wet monitoring generally uses As a reference for other mercury monitoring methods, it can measure the concentration of elemental mercury, oxidized mercury, particulate mercury and total mercury in the flue gas respectively, and finally obtain the average concentration of mercury during the sampling period. When using this method, attention should be paid to: absorption The liquid must be prepared and used immediately, and the sample must be analyzed in time. During the sampling process, measurement errors will be caused by the adsorption of unburned carbon in the fly ash, etc.

[0015] NO X , SO 2 It will inhibit the capture of mercury by activated carbon, mainly because the moisture content of the flue gas after desulfurization is extremely high, and the NO X , SO 2 Acid mist is formed, and NO X , SO 2 Molecule itself is very polar, in the flue gas H 2 Under the influence of 0, these acid gases can cause the mercury compounds formed after adsorption to be reduced to elemental mercury, which reduces the adsorption rate and leads to the escape of mercury.