Preparation method and application of calcium-rich charcoal-lanthanum alginate hydrogel ball

Abstract

The invention discloses a preparation method and application of calcium-rich biochar-lanthanum alginate hydrogel ball, the preparation method comprises the following steps: drying calcium-rich biomass waste, calcining at high temperature, cooling, grinding and sieving to obtain calcium-rich biochar; the preparation method comprises the following steps: dissolving sodium alginate in deionized water at room temperature, and adding calcium-rich biochar under the ultrasonic action to obtain a suspension system with uniformly dispersed particles; slowly dropwise adding the suspension into a lanthanum chloride solution to form composite hydrogel balls, standing and cross-linking, and washing with deionized water; and drying the hydrogel balls to obtain the hydrogel. The adsorbent is applied to adsorption of fluorides in a water environment. According to the invention, based on the basic principles of multi-component blending and the idea of treating waste with waste, the mechanical strength of the hydrogel is improved by introducing the calcium-rich biochar; the rare earth element lanthanum is used as a doping metal, so that the selectivity of the hydrogel ball to fluoride is enhanced; the obtained calcium-rich charcoal-lanthanum alginate hydrogel ball can effectively treat a low-concentration fluorine-containing water body, and meets the requirement of the concentration of fluorine in drinking water.

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