Abstract:The treatment of uranium-containing wastewater by adsorption technology has the advantages of simple operation, green and clean, and excellent removal performance. The development of new adsorption materials with high efficiency and simple preparation is an important research topic in this field. Bimetallic hydroxides have the characteristics of simple synthesis and excellent adsorption performance, and have become potential adsorption materials for efficient treatment of metal ion-containing wastewater. However, the maximum adsorption capacity of cobalt-magnesium bimetallic hydroxides for uranium reported in the literature is only 9.84mg·g-1 and the cost is expensive. In this study, a new type of iron-barium bimetallic hydroxide adsorption material was prepared by one-step synthesis method. It was characterized and analyzed, and the single factor condition test was carried out to optimize the process parameters. The following main conclusions were obtained: The Fe-Ba bimetallic hydroxide is an irregular particle-like structure and has certain pores. It is mainly composed of Fe(OH)3, Ba(OH)2 and BaCO3, and is rich in hydroxyl and carbonate. The complexation of hydroxyl and carbonate to uranium is the main adsorption mechanism. The optimum conditions for the removal of U(VI) in wastewater by the adsorbent were temperature of 25℃, pH=5.5, solid-liquid ratio of 0.2g·L-1, and time of 50min. Under this condition, the removal rate of uranium in wastewater containing 10mg·L-1 U(VI) was 96.52%. The adsorption material is less affected by interfering ions and humic acid, and has certain selectivity for uranium in the treatment of wastewater containing U(VI) 10mg·L-1. The adsorption model analysis showed that the removal of uranium by the adsorbent was mainly monolayer and chemical adsorption, and the maximum adsorption capacity could reach 163.93mg·g-1. The adsorption material is suitable for the treatment of wastewater containing uranium 5~10mg·g-1, and has the advantages of simple preparation, no secondary pollution and low cost, and has industrial application value.
