Nano-hydroxyapatite dry method modified nano black carbon heavy metal absorbent as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of solid-phase grinding dry method modification and relates to preparation and application of a nano-hydroxyapatite dry method modified nano black carbon heavy metal absorbent. The method comprises the following steps: mixing nano-hydroxyapatite and nano black carbon according to a certain proportion to obtain modified nano black carbon through a solid-phase grinding method after the nano-hydroxyapatite and the nano black carbon are evenly mixed, wherein the mass ratio of HAP to MBC is (3 to 4) to (1 to 1). The nano-hydroxyapatite dry method modified nano black carbon is utilized as an absorbent to be applied to absorb Cu<2+> and Cd<2+> in wastewater, the saturated adsorption of the prepared nano-hydroxyapatite dry method modified nano black carbon on the Cu<2+> is 478.89 mmol / kg, and the saturated adsorption of the nano-hydroxyapatite dry method modified nano black carbon on the Cd<2+> is 423.49 mmol / kg.

Description

technical field [0001] The disclosure belongs to the technical field of solid-phase grinding dry method modification, in particular to a nano-hydroxyapatite dry-modified nano-black carbon to prepare a heavy metal adsorbent and its preparation and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily to be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Heavy metals are highly toxic, and a large amount of pollutants containing heavy metals will be discharged into the environment, which will cause heavy metals to accumulate in the environment. Therefore, the problem of heavy metal pollution needs to be solved urgently. At present, the treatment of sewage containing heavy metals mostly adopts adsorption precipit...

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Problems solved by technology

The inventors have found that each adsorbent has certain limitations: one is that the modified adsorbents have stronger adsorption properties to Pb, Cu, Zn, Ni, and poor adsorption performance to Cd; the other is that , the selectivity of the modified adsorbent is enhanced, and often cannot be applied to the simultaneous treatment of multiple heavy metals

[0004] Especially when the adsorbent is applied to the passivation restoration of heavy metal-contaminated soil, when the soil is polluted by several heavy metals, the adsorption and passivation effect on Cd is even worse.

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