Research on uranium adsorption performance of magnetic compound MnO2@Fe3O4@rGO

Abstract

The invention mainly relates to the removal problem of uranium ions and the adsorption behavior of uranyl ions. The invention aims to overcome the defects of secondary pollution, weak mechanical strength and difficulty in separation of part of existing adsorbents, so that the adsorbents can be used by people for a long time. A method adopted by the invention mainly comprises the following steps: with graphene and MnO2 as basic materials, preparing a Fe3O4@rGO compound by adopting a hydrothermal method; and synthesizing a MnO2@Fe3O4@rGO magnetic compound by using a water bath method. The magnetic compound is subjected to morphology characterization and electrochemical test, the result proves that the compound has high uranium adsorption performance, the uranium removal rate is not obviouslychanged due to the increase of the amount of MnO2@Fe3O4@rGO after the peak value is reached, and the compound has high regeneration performance.

Description

technical field [0001] This invention mainly involves the removal of uranium ions and the adsorption behavior of uranyl ions. Background technique [0002] With the continuous development of modern industry, traditional non-renewable energy sources (such as oil and coal, etc.) are constantly being consumed, facing the problem of resource depletion. In order to alleviate this thorny problem, scientific researchers have done a lot of research to find energy that can replace traditional non-renewable energy. In recent years, nuclear energy, an alternative energy source, has been highly valued by researchers. With increasing energy demand, nuclear energy is considered to be the only mature, continuous, and large-scale energy source. In the process of developing nuclear energy, uranium can be effectively used, which brings economic benefits to people, but also produces pollution that endangers human health. Uranium is considered one of the most dangerous heavy metals in the env...

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Problems solved by technology

[0003] In order to solve the harm of the above-mentioned uranium to the environment and human health and to overcome the shortcomings of the existing adsorbent secondary pollution and difficult separation, the present invention synthesized the magnetic adsorption material MnO with graphene as the substrate. 2 @Fe 3 o 4 @rGO, the composite material has the best adsorption performance for uranium at pH=6, and the temperature also affects the MnO 2 @Fe 3 o 4 An important factor for the adsorption performance of @rGO, the theoretical adsorption amount of the composite is the largest at 55 °C, MnO 2 @Fe 3 o 4 @rGO is a magnetic composite, which can be easily separated from aqueous solution with an external magnetic field, and can still maintain a high adsorption efficiency after multiple adsorption-desorption cycles, which provides the possibility for recycling, not only improves the treatment efficiency of uranium and provides a rationale for the treatment of other toxic metals

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