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Enhanced removal of uranium(VI) from aqueous solution by a novel Mg-MOF-74-derived porous MgO/carbon adsorbent

Lv, Zhimin, Wang, Haiyan, Chen, Changlun, Yang, Shimin, Chen, Lei, Alsaedi, Ahmed, Hayat, Tasawar
Journal of colloid and interface science 2019 v.537 pp. A1
X-ray photoelectron spectroscopy, adsorbents, adsorption, aqueous solutions, carbon, electrostatic interactions, magnesium oxide, models, nuclear power industry, surface area, uranium, wastewater, zeta potential
The elimination and safe treatment of U(VI) from radioactive wastewater has attracted widespread attention with the development of the nuclear power industry. In this work, a MgO/carbon adsorbent was successfully prepared by one-step Mg-MOF-74 pyrolyzation and used for U(VI) removal from aqueous solution. Characteristic results indicated that the as-prepared composite was a typical porous structure. The adsorption performance of the MgO/carbon towards U(VI) was studied by batch experiments. The results indicated that the MgO/carbon can rapidly and effectively remove U(VI) and showed an excellent adsorption capacity (777.51 mg/g), which is much higher than other reported adsorbent materials. In addition, the intraparticle diffusion model provides a good explanation for each adsorption process. The adsorption capacity of the MgO/carbon towards U(VI) is greatly promoted by the large specific surface area and well-defined porous structure. Based on the zeta potential and XPS analysis, the possible mechanism for U(VI) removal involved the surface complexation and electrostatic attraction. The results indicate that the MgO/carbon can be regarded as an efficient adsorbent for U(VI) removal from wastewater, which has a very broad application prospect.