Preparation method of spherical calcium alginate @ FeOOH desulfurizing agent

Abstract

The invention belongs to the field of preparation of materials for treating low-concentration sewage containing S<2->, and particularly relates to a preparation method of a spherical calcium alginate@ FeOOH desulfurizing agent capable of being adsorbed to the low-concentration sewage containing S<2->. The method comprises the following steps: mixing a FeCl3 solution, a sodium dodecyl sulfate (SDS) solution, nano ZnO particles and a NaOH solution according to a certain ratio, and placing the mixture into a hydrothermal reaction kettle for reaction; filtering, washing and drying the precipitatein the kettle after the reaction to obtain a product, and mixing the product with sodium alginate and zeolite with the particle size of 60-120 meshes according to a certain proportion; and dropping the solid-liquid mixture into a calcium chloride solution with a certain concentration by using a dropper to form the final product spherical calcium alginate @ FeOOH desulfurizer. The raw materials are cheap and easily available; the prepared globules are red brown, non-toxic and odorless. The product is simple in technological process, residues after adsorption are easy to treat, and secondary pollution is avoided. Excellent S<2-> adsorption performance is achieved; when the concentration of S<2-> in water is 1-25 mg / L and the addition amount of the product is 5 g / L, the removal rate of S<2->can reach 85%-99%, and the method can be widely applied to the field of treatment of low-concentration S<2-> containing sewage.

Description

technical field [0001] The invention belongs to the field of material desulfurization, in particular to a spherical calcium alginate@FeOOH desulfurizer for removing S in sewage 2- functional materials. Background technique [0002] Currently S 2- It is strictly controlled if it is more harmful in water. For S 2- There are many removal methods, such as absorption, adsorption, and biological methods; FeOOH is mostly used to remove cations in water such as heavy metal chromium, but there is no precedent for removing anion sulfide ions. In terms of the process of removing cations, FeOOH is mostly put into Water to adsorb cations, so it is difficult to remove FeOOH after use. Therefore, a spherical calcium alginate@FeOOH desulfurizer was developed. Putting this small ball into sewage not only adsorbs sulfide ions but also can be filtered and deposited. The adsorbed pellets are removed. [0003] Chinese patent 201611204175.X [0004] Chinese patent 201910058063.5 [0005] Ch...

AI Technical Summary

Problems solved by technology

[0002] Currently S 2- It is more harmful in water and is under strict control. For S 2- There are many removal methods, such as absorption, adsorption, and biological methods; FeOOH is mostly used to remove cations in water such as heavy metal chromium, but there is no precedent for removing anion sulfide ions. In terms of the process of removing cations, FeOOH is mostly put into Water to adsorb cations, so it is difficult to remove FeOOH after use. Therefore, a spherical calcium alginate@FeOOH desulfurizer was developed. Putting this small ball into sewage not only adsorbs sulfide ions but also can be filtered and deposited. Adsorbed beads removed