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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.