In this study, sewage sludge-derived biochars (SSBs) were prepared at two pyrolysis temperatures of 450 °C (SSB450) and 600 °C (SSB600) for U(VI) removal. The maximum adsorption capacity of SSB450 and SSB600 was 43.13 and 47.47 mg g-1, respectively, at initial pH of 3. While the adsorption process of U(VI) onto the SSBs were accurately described by the pseudo-second-order model and Langmuir isotherm model. Ion exchange and complexation were assumed as the adsorption mechanism. The adsorption–desorption experiment showed that both the U(VI) removal efficiency and SSB regeneration efficiency were greater than 80%. Thus, the SSB has a potential application in U(VI)-containing wastewater treatment.

中文翻译：

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两种热解温度下污水污泥衍生生物炭的U(VI)去除效率及机理

在这项研究中，污水污泥衍生的生物炭 (SSB) 在 450 °C (SSB450) 和 600 °C (SSB600) 两个热解温度下制备，用于去除 U(VI)。在初始 pH 值为 3 时，SSB450 和 SSB600 的最大吸附容量分别为 43.13 和 47.47 mg g-1。而 U(VI) 在 SSB 上的吸附过程可以通过伪二级模型和 Langmuir 准确描述等温模型。离子交换和络合被假定为吸附机制。吸附-解吸实验表明，U(VI)去除效率和SSB再生效率均大于80%。因此，SSB 在含 U(VI) 的废水处理中具有潜在的应用。