Utilization of Citrullus lanatus L. seeds to synthesize a novel MnFe2O4-biochar adsorbent for the removal of U(VI) from wastewater: Insights and comparison between modified and raw biochar

文献类型： 外文期刊

第一作者： Ahmed, Waqas

作者： Ahmed, Waqas;Mehmood, Sajid;Ying, Huang;Chen, Di-Yun;Ahmed, Waqas;Mehmood, Sajid;Ying, Huang;Chen, Di-Yun;Nunez-Delgado, Avelino;Ali, Sehrish;Qaswar, Muhammad;Khan, Zulqarnain Haider

作者机构：

关键词： Uranium remediation; Iron/manganese co-precipitation; Adsorption; Wastewater treatment; Sustainable remediation

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2021 年 771 卷

页码：

收录情况： SCI

摘要： Uranium (U) is a radioactive and highly toxic metal. Its excessive concentrations in the aqueous environments may result in severe and irreversible damage. To fight this hazard, a raw biochar was prepared from Citrullus lanatus L. seeds, then characterized and compared with a MnFe2O4 modified biochar, both tested for U(VI) adsorption from wastewater, which was assayed for the first time in this study. The characterization of the adsorbent materials was performed by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) with elemental mapping, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD) techniques. The effects of solution pH, concentration of sorbate and sorbents, temperature, time and ionic strength were assessed as regards their influence on U(VI) adsorption. The experimental adsorption data showed good fit to a pseudo-second-order kinetic model (reaching a value of q(e) = 15.12 mg g(-1), R-2 = 0.96 at equilibrium), and to the Langmuir isotherm (achieving a maximum score of q(max) = 27.61 mg g(-1), R-2 = 0.96). The maximum adsorption capacity was found at 318 K. The results of the study indicate that the binding of negatively charged functional groups (carbonyls, hydroxyls, and some carboxylic groups) with MnFe2O4 significantly enhanced U(VI) adsorption. In view of the overall results, it can be concluded that the MnFe2O4 modification of the Citrullus lanatus L. seeds biochar could give an efficient alternative adsorbent for U(VI) removal in a variety of environmental conditions, simultaneously promoting resource utilization and good sustainable management of thematerials studied, aiding to protect the environment and human health. (C) 2021 Elsevier B.V. All rights reserved.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序