Method for adsorbing and separating low-concentration rare earth ions with oxidized graphene colloid

Abstract

A method for adsorbing and separating low-concentration rare earth ions with an oxidized graphene colloid is characterized in that through the use of the screening characteristics of a dialysis membrane and the strong rare earth ion adsorption performance of the oxidized graphene colloid, the oxidized graphene colloid is packaged in a dialysis bag, the dislysis bag filled with the oxidized graphene colloid is placed in a rare earth ion solution, and rare earth ions pass through the dialysis membrane quickly to be adsorbed efficiently, so that separation and enrichment of the rare earth ions can be realized; after oxidized graphene that adsorbs the ions is treated with an acidic solution, the rare earth ions can be adsorbed efficiently, and the oxidized graphene can be regenerated and recycled at the same time; since oxidized graphene in the dialysis bag can not pass through the dialysis bag and can not enter an adsorbed water solution, the secondary pollution of a sorbent can be avoided, and solid-liquid separation amount can be reduced greatly. The method is simple in implementation and high in adsorption speed, has high adsorption capacity in a large pH range, and has a good application prospect in separation and enrichment of low-concentration rare earth ions in waste water of rare earth mines and separation plants.

Description

technical field [0001] The invention belongs to the fields of resource recovery and water environment treatment, and relates to a method for adsorption and separation of low-concentration rare earth ions. technical background [0002] With the continuous emergence and application of new materials and high technologies, the global demand for rare earths is increasing year by year. However, high-grade rare earth ores are decreasing, especially in the mining process of ion-adsorbed rare earths in the south. The scouring of rainwater will bring the residual rare earth in the mine or the rare earth ions in the downstream ore body into the streams and rivers around the mine or even into the underground water system and lose it. This will not only cause a great waste of rare earth resources, but also cause serious water pollution and affect The ecological environment threatens the safety of drinking water and crops, and endangers human health. Therefore, no matter from the perspec...

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Problems solved by technology

At present, the use of colloidal adsorption materials to treat wastewater for adsorption and enrichment of metal ions is almost always to disperse the adsorbent evenly in the wastewater and directly contact with the wastewater, so there are secondary pollution caused by the adsorbent and the amount of solid-liquid separation is large or even difficult. The problem

Although the magnetic graphene-based composite nano-adsorbent can be conveniently polymerized by an external magnetic field, it must undergo a large amount of filtration under an external magnetic field to achieve solid-liquid separation, and the synthesis process of magnetic composite particles is complicated, high in cost, and difficult for large-scale practical application.

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