The adsorption capacity of the water hyacinth-derived biochar on U(VI) was investigated in this study. The as-prepared sample was characterized by methods of SEM, XRD, XPS, FT-IR and BET. Functional groups on the biochar surface could undergo complexation with U(VI). Effects of adsorption dose, temperature, contact time, solution pH and ionic strength were studied by static batch experiments. Results show that the adsorption could be better fitted by the pseudo-second-order kinetic equation and Langmuir model. The solution pH has a great impact on the U(VI) adsorption, while the ionic strength exerts no significant effect.

中文翻译：

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水葫芦衍生生物炭对铀（VI）的吸附特性研究

本研究研究了水葫芦衍生的生物炭对 U(VI) 的吸附能力。通过SEM、XRD、XPS、FT-IR和BET方法对制备的样品进行表征。生物炭表面的官能团可以与 U(VI) 络合。通过静态批量实验研究吸附剂量、温度、接触时间、溶液pH值和离子强度的影响。结果表明，拟二级动力学方程和朗缪尔模型可以更好地拟合吸附。溶液pH值对U(VI)吸附有很大影响，而离子强度无显着影响。