Nano calcium carbonate as well as preparation method and application thereof

The invention provides nano calcium carbonate as well as a preparation method and application thereof. The preparation method comprises the following steps: fully reacting 8g of waste egg shells with50mL of a hydrochloric acid solution (3mol L) until no bubbles emerge; reacting the reacted solution with a sodium carbonate solution (0.1 mol L) according to different volume ratios, magnetically stirring for 0.5 h at 30 DEG C, washing the precipitate with UP water for 3 times, and centrifuging; and drying in an oven at 55 DEG C until the weight is constant, thereby finally obtaining thecalcium carbonate nano material. According to the method, the calcium carbonate nano material with a peanut shell morphology is synthesized by taking waste egg shells as a calcium source through a co-precipitation method, the calcium carbonate material has a relatively good VB adsorption effect in a short time, and adsorption basically conforms to an isothermal adsorption Langmuir model. The adsorption process follows a qu