Amino-rich compound modified chitosan-zirconium composite gel ball as well as preparation and application thereof

Abstract

The invention relates to an amino-rich compound modified chitosan-zirconium composite gel ball as well as preparation and application thereof. An amino-rich compound is cross-linked and grafted on a chitosan-zirconium (IV) composite gel ball. The method comprises the following steps: adding an ammonia water solution into a precursor solution containing zirconium ions and chitosan gel to form chitosan-zirconium (IV) composite gel balls; preparing a mixed solution from the chitosan-zirconium (IV) composite gel balls, a cross-linking agent and the amino-rich compound, and heating for reaction toobtain the amino-rich compound modified chitosan-zirconium (IV) composite gel balls. Rich amino groups and zirconium (IV) with strong adsorption performance on phosphate radicals in water are introduced into the surface of the gel ball material; the prepared composite gel ball has good adsorption performance on phosphate radicals, the theoretical maximum adsorption capacity reaches up to 103.96 mg-P / g, the adsorption capacity is kept stable after the composite gel ball is repeatedly used for five times, and the composite gel ball has good column adsorption characteristics.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a chitosan-zirconium (IV) composite gel ball modified by an amino-rich compound and a preparation method and application thereof. Background technique [0002] Phosphate, as a non-renewable nutrient, is indispensable for the growth of all living things. However, its widespread use has resulted in excess phosphorus entering the natural environment in the form of sewage discharge or runoff, leading to eutrophication of water bodies. In recent years, considering environmental protection and sustainable utilization of phosphorus resources, the efficient removal and recovery of phosphorus resources from sewage has become a topic of widespread concern. Precipitation by adding struvite in the form of magnesium and calcium salts as fertilizer is considered to be a potential technique for phosphorus recovery, however, this method is considered only when the phosphorus concentra...

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Problems solved by technology

[0005] The object of the present invention is to provide a chitosan-zirconium (IV) composite gel ball modified by a rich amino compound for the problems of poor adsorption capacity and stability and difficult separation and recovery of most phosphorus removal adsorbents and its preparation and application, wherein zirconium (IV) is introduced into the network structure of chitosan gel balls, which can improve the adsorption capacity and stability of pure chitosan gel balls; at the same time, the use of amino-rich compounds to gel Modification of the surface of the spheres, increasing the active sites, can further improve the phosphorus removal performance of the adsorbent

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