Preparation method, applications and regeneration methods of chitosan-modified zeolite molecular sieve

Abstract

The invention discloses a preparation method of a chitosan-modified zeolite molecular sieve. The preparation method comprises the following steps: washing a zeolite molecular sieve with deionized water, putting the zeolite molecular sieve into an oven, and dissolving dried chitosan into an acetic acid solution to prepare chitosan acetic acid sol; putting the dried zeolite molecular sieve into thechitosan acetic acid sol; combining the chitosan acetic acid sol with the zeolite molecular sieve by using a constant-temperature oscillator; and taking out combined particles, washing the combined particles with deionized water until the combined particles are neutral, and then conducting drying. On the basis of the prepared chitosan-modified zeolite molecular sieve, two applications of the chitosan-modified zeolite molecular sieve in wastewater treatment are provided, optimization and regeneration methods are provided for the chitosan-modified zeolite molecular sieve used in the two applications respectively. Thus, high practical value and good application prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of molecular sieves, in particular to a preparation method, application and regeneration method of a chitosan-modified zeolite molecular sieve. Background technique [0002] Ammonia nitrogen in water will be converted into nitrate nitrogen and nitrite nitrogen after oxidation, and nitrate nitrogen and nitrite nitrogen will cause serious harm to the human body. Nitrite nitrogen can be converted into methemoglobin with hemoglobin in the human body. Methemoglobin will cause hypoxia, and babies are more likely to suffer from methemoglobinemia, which will cause asphyxiation and death in severe cases; when the ammonia nitrogen content is high, it will cause gastrointestinal symptoms. Obstacles, prone to diarrhea and other symptoms. In addition, the oxidation of high concentrations of ammonia nitrogen to nitrate nitrogen and nitrite nitrogen will also cause damage to the cardiovascular system of the human body. Wh...

AI Technical Summary

Problems solved by technology

Especially with the water tank water supply method, the water in the water tank will be kept for a period of time before being supplied to the user. When the water delivered to the water tank by the water purification plant contains a certain concentration of ammonia nitrogen, or the groundwater with a higher concentration of ammonia nitrogen, after treatment. Ammonia nitrogen It did not meet the standard. After staying in the water tank for a long time, the disinfectant in the water tank reacted with the residual ammonia nitrogen to produce toxic by-products of nitrite. When the water containing nitrite in the water tank was drunk by residents, It will cause harm to the health of residents, so it is necessary to find a suitable and economical method to filter and remove it

[0003] At present, chitosan is used as a modifying agent to modify the research on zeolite molecular sieves less, and the prepared chitosan modified zeolite molecular sieve is also blank for the research of removing ammonia nitrogen and nitrate nitrogen in groundwater. There are no related reports on the systemic regeneration and mechanism analysis of chitosan-modified zeolite molecular sieves with saturated adsorption