Fabrication, characterization and U(VI) sorption properties of a novel biochar derived from Tribulus terrestris via two different approaches

文献类型： 外文期刊

第一作者： Ahmed, Waqas

作者： Ahmed, Waqas;Mehmood, Sajid;Ying, Huang;Liu, Zequan;Chen, Di-Yun;Ahmed, Waqas;Mehmood, Sajid;Ying, Huang;Liu, Zequan;Chen, Di-Yun;Nunez-Delgado, Avelino;Qaswar, Muhammad;Ali, Sehrish;Mahmood, Mohsin

作者机构：

关键词： Biochar; Uranium remediation; Single and two step magnetizations; Kinetics; Thermodynamics; Reusability

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 780 卷

页码：

收录情况： SCI

摘要： Water contamination due to radionuclides is considered a crucial environmental issue. In this study, Tribulus terrestris plant biomass was used as a precursor for obtaining biochar (BC), that was further modified by two different methods using FeCl3 to obtain two different magnetic biochars. Both (one-step biochar, called 1S-BC, and two-steps biochar, called 2S-BC) were studied to investigate their capability for adsorbing/removing uranium (VI) from aqueous solutions. The U(VI) removal efficacy of both biochars was tested for different values of pH, ionic strength, initial concentration of U(VI) and temperature. Experimental adsorption data fitted well to the Freundlich model (achieving as highest value for adsorption capacity K-F = 49.56 mg g(-1) (mg L-1)(-1/n), R-2 = 0.99). Thermodynamic studies revealed that adsorption was endothermic, characterized by inner-sphere complexation, and entropy-driven with a relatively increased randomness in the solid-solution interface. X-ray photoelectron spectroscopy (XPS) revealed that U(VI) sorption took place by surface complexation between U(VI) and oxygen containing functional groups on both biochars. Five consecutive regeneration cycles verified an excellent reusability for 1S-BC. The overall results allow to conclude that the FeCl3 modification of the biochar obtained from Tribulus terrestris plant biomass could give an efficient alternative adsorbent for U(VI) removal in a variety of environmental conditions, promoting protection of the environment and human health, as well as facilitating resource utilization and sustainable management of the materials studied. (C) 2021 Elsevier B.V. All rights reserved.

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