A kind of preparation method of nickel-based water body ammonia nitrogen adsorbent

Abstract

The invention discloses a preparation method of a nickel-based underwater ammonia nitrogen adsorbent. The nickel-based underwater ammonia nitrogen adsorbent is prepared from municipal sludge, chitosan, sodium tripolyphosphate, rice husk, sodium metaaluminate, nickel nitrate and other raw materials. Hydrothermal carbon adopting a developed pore structure is obtained through hydrothermal carbonization of the municipal sludge, and in combination with the polyfunctional chitosan and through crosslinking by the sodium tripolyphosphate, on one hand, a network structure is formed to compensate for the defect of low porosity of the chitosan, and on the other hand, the mass transfer resistance can be reduced and adsorption of ammonia nitrogen in water is facilitated; and meanwhile, mayenite is prepared from calcium hydroxide and aluminum hydroxide, and through compounding with a nickel-based catalyst, a free oxygen structure therein is used for improving the carbon deposition resistance of thenickel-based catalyst, so that the catalytic performance is enhanced and the purpose of rapidly degrading and treating an adsorbate is achieved. The finally obtained multi-component adsorbent has stable physical and chemical properties, a large number of adsorption sites and large adsorption capacity, can effectively achieve adsorptive removal of the ammonia nitrogen in the water, and provides a favorable technical support for water pollution control.

Description

technical field [0001] The invention relates to the technical field of adsorption materials, in particular to a preparation method of a nickel-based water body ammonia nitrogen adsorbent. Background technique [0002] Ammonia nitrogen is the most prominent water pollution factor in aquaculture, and it is also one of the main pollution factors that lead to eutrophication of water bodies caused by the overgrowth of algae and plankton. According to the 2016 monthly water quality reports across the country, ammonia nitrogen is one of the main pollutants in 1,652 sections of 920 rivers across the country, and the rivers are generally lightly polluted. In the information list of water quality control units released by the Ministry of Environmental Protection in June 2016, ammonia nitrogen was listed as a key control item in the 2020 water quality control goals. [0003] Biological nitrification and denitrification method, steam stripping method, break point chlorination method, i...

AI Technical Summary

Problems solved by technology

[0004] Nickel-based catalysts have excellent catalytic cracking performance for organic pollution. Inserting them into the preparation of adsorbents can increase the number of surface active centers for organic catalytic cracking in the adsorbent, increase the rate of carbon-hydrogen bond breakage in pollutants, and realize the removal of pollutants. However, since single-metal nickel-based catalysts are prone to carbon deposition and lead to deactivation, it is necessary to find a good composite material and carrier to make the catalyst have the ability to resist carbon deposition and hydrogen sulfide, thereby enhancing the performance of the catalyst