Preparation method of Prussian blue compound deammonization material and application in deammonization of sewage

Abstract

The invention provides a prussian-blue compound ammonium removal material, which belongs to the technical field of sewage ammonium removal. A prussian-blue compound has a chemical formula as A2MFe(CN)6, wherein A is Na<+> or K<+>, and M is one of Zn<2+>, Cu<2+>, Ni<2+>, Co<2+> or Mn<2+>. A preparation method of the material comprises the following steps of respectively preparing a transition metal salt solution and a ferrocyanogen complex solution; adding a certain mass of corresponding solid chloride into the ferrocyanogen complex solution, enabling the chloride to completely dissolve into the ferrocyanogen complex solution, and thus obtaining a mixed solution of a ferrocyanogen complex and the chloride; gradually dropwise adding the transition metal salt solution into the mixed solution, magnetically stirring while dropwise adding, continuously stirring after finishing dropwise adding, thus obtaining a white suspension, and carrying out still settlement and centrifugal separation to obtain white solids; using deionized water for repetitively cleaning and removing impurities, and drying to obtain the ammonium removal material. The ammonium removal material provided by the invention has the advantages of large adsorption capacity on ammonium ions, high adsorptive selectivity, low production cost and stable performance.

Description

technical field [0001] The invention relates to the technical field of deammonization of sewage, in particular to a preparation method of a Prussian blue compound deammonization material and its application in deammonization of sewage, which is suitable for large-scale popularization and application. Background technique [0002] In my country, with the acceleration of urbanization, people's living standards are improving, environmental pollution and people's attention to the environment are getting stronger and stronger, while municipal sewage often contains a large amount of ammonium nitrogen, and excessive ammonia nitrogen will cause serious damage to the water body. Pollution. Studies have shown that when the concentration of ammonia nitrogen in surface water is about 5mg / L, it will have a toxic effect on fish. Therefore, wastewater containing higher concentrations of ammonia nitrogen must be treated before entering the water body. At present, the conventional treatment m...

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Problems solved by technology

Although the cation exchange resin has a relatively large exchange capacity, its selectivity to ammonium ions is very poor, and it can adsorb almost all cations in the water body, and the fatal shortcoming of the cation exchange resin is that it is easily polluted by charged organic substances in the water body and becomes invalid. normal operation of the project

Zeolite molecular sieves have certain selectivity to ammonium ions, but the biggest shortcoming of zeolite molecular sieves is that the adsorption capacity is too low, resulting in frequent regeneration or the amount of adsorbent required is too large (Wang Minghui et al., "13X Molecular Sieve for Ammonia Nitrogen Removal / Preparation and performance characterization of PES membrane adsorbent", Chinese Journal of Environmental Engineering, 2013, 1, 3749-3754.)

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