Bifunctional adsorbent as well as preparation method and application thereof

Abstract

The invention discloses a bifunctional adsorbent as well as a preparation method and application thereof. The preparation method comprises the following step: carrying out modification treatment on a cryptomelane molecular sieve by adopting metal chloride to obtain the bifunctional adsorbent. According to the invention, the chloride is used to modify the cryptomelane molecular sieve to prepare the adsorbent with dual catalysis and adsorption functions, so adsorption capacity is improved, and the cycle service life of the adsorbent is prolonged; and after the bifunctional adsorbent is inactivated due to adsorption saturation, ozone can be converted into active oxygen atoms with higher oxidizing property due to the specific efficient ozone decomposition effect of the cryptomelane molecular sieve, and peculiar smell molecules on the surface of the adsorbent are subjected to oxygenolysis; that is, normal-temperature regeneration of the adsorbent is realized in an ozone atmosphere, deep degradation of peculiar smell gas such as ammonia gas and hydrogen sulfide can be achieved in a regeneration process, and secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of adsorbents, and in particular relates to a dual-functional adsorbent and its preparation method and application. Background technique [0002] There are various smells in the living environment, such as floral, fruity, and essential oil scents, which are fresh and pleasant, and can play a soothing role. However, there are also some gases that are not only unpleasant, but also cause physical discomfort when the concentration is high or for a long time. Toxins, such as ammonia, hydrogen sulfide, methyl mercaptan and other odor molecules. [0003] At present, the treatment of odor gas includes solution absorption method, combustion method, biological decomposition method, catalytic oxidation method, adsorption method, etc. Among them, the adsorption method is simple to operate, and physical and chemical interactions can occur between odor molecules and adsorbents, and the treatment efficiency is high. The a...

AI Technical Summary

Problems solved by technology

Patent CN202011244466.8 discloses a method for preparing an activated carbon fiber-based adsorbent for removing hydrogen sulfide, phosphine, arsine, and ammonia, which can simultaneously remove various air pollutants with high efficiency, but its The preparation method is firstly treated by plasma, then impregnated, and finally roasted in a microwave muffle furnace, which requires high energy consumption, high cost and cumbersome steps.

Although the adsorption method has advantages in the treatment of odorous gases, it has to face the problem of how to effectively regenerate the adsorbent that has been deactivated by adsorption saturation.

High-temperature calcination is a commonly used method for adsorbent regeneration. Although this method can restore micropores and active sites, heat accumulation during the calcination process easily destroys the internal molecular structure of the adsorbent and affects regeneration efficiency.

For example, patent CN201110167136.8 discloses a method for regeneration of molecular sieve catalysts, which involves inactivated molecular sieves being roasted at constant temperature in stages to achieve regeneration; patent CN201610153307.4 discloses a method for regeneration of deactivated titanium-silicon molecular sieve catalysts, through acid treatment and alkali Roasting after treatment can effectively remove metal impurities and anatase, and its activity and life can reach the level of fresh agents. However, these methods have many processing steps, easily produce waste liquid, and are not environmentally friendly.

Images