School of Agricultural Engineering, Jiangsu University, Zhenjiang, 212013, China; School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, China.
School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, China.
Environ Pollut. 2023 Aug 1;330:121717. doi: 10.1016/j.envpol.2023.121717. Epub 2023 May 4.
In this study, an autogenous N-doped biochar derived from Chlorella (CVAC) was prepared with NaOH as activator at 800 °C. The surface structural properties of CVAC and the adsorption performance of CVAC on tetracycline (TC) under different adsorption variables were analyzed and investigated using different characterization methods. The results showed that the specific surface area of CVAC was 491.16 m g and the adsorption process was in accordance with Freundlich model and pseudo-second-order kinetic model. The maximum adsorption capacity of TC was 310.696 mg g at pH 9 and 50 °C, and it was mainly physical adsorption. Furthermore, the cyclic adsorption-desorption behavior of CVAC using ethanol as eluent was evaluated and the feasibility of its long-term application was explored. CVAC also showed good cyclic performance. The variation of ΔG° and ΔH° confirmed that the adsorption of TC by CVAC was a spontaneous heat absorption process.
在这项研究中，以 NaOH 为活化剂，在 800°C 下制备了一种源自小球藻（CVAC）的自体 N 掺杂生物炭。采用不同的表征方法分析了 CVAC 的表面结构性质以及 CVAC 在不同吸附变量下对四环素（TC）的吸附性能。结果表明，CVAC 的比表面积为 491.16 m²/g，吸附过程符合 Freundlich 模型和拟二级动力学模型。在 pH 9 和 50°C 时，TC 的最大吸附容量为 310.696 mg/g，主要为物理吸附。此外，还评估了 CVAC 以乙醇为洗脱剂的循环吸附-解吸行为，探索了其长期应用的可行性。CVAC 还表现出良好的循环性能。ΔG°和ΔH°的变化证实了 CVAC 对 TC 的吸附是一个自发的吸热过程。
