Korea Biochar Research Center & Department of Biological Environment, Kangwon National University, Chuncheon 200-701, Republic of Korea; Chemical and Environmental Systems Modeling Research Group, National Institute of Fundamental Studies, Kandy, Sri Lanka.
Chemical and Environmental Systems Modeling Research Group, National Institute of Fundamental Studies, Kandy, Sri Lanka.
J Hazard Mater. 2015 Jun 15;290:43-50. doi: 10.1016/j.jhazmat.2015.02.046. Epub 2015 Feb 17.
Recent investigations have shown frequent detection of pharmaceuticals in soils and waters posing potential risks to human and ecological health. Here, we report the enhanced removal of sulfamethazine (SMT) from water by physically activated biochar. Specifically, we investigated the effects of steam-activated biochars synthesized from an invasive plant (Sicyos angulatus L.) on the sorption of SMT in water. The properties and sorption capacities of steam-activated biochars were compared with those of conventional non-activated slow pyrolyzed biochars. Sorption exhibited pronounced pH dependence, which was consistent with SMT speciation and biochar charge properties. A linear relationship was observed between sorption parameters and biochar properties such as molar elemental ratios, surface area, and pore volumes. The isotherms data were well described by the Freundlich and Temkin models suggesting favorable chemisorption processes and electrostatic interactions between SMT and biochar. The steam-activated biochar produced at 700 °C showed the highest sorption capacity (37.7 mg g(-1)) at pH 3, with a 55% increase in sorption capacity compared to that of non-activated biochar produced at the same temperature. Therefore, steam activation could potentially enhance the sorption capacities of biochars compared to conventional pyrolysis.
最近的调查表明，药品在土壤和水中的频繁检测对人类和生态健康构成了潜在风险。在这里，我们报告了通过物理激活生物炭增强了对水中磺胺甲恶唑（SMT）的去除。具体来说，我们研究了从入侵植物（旋花）合成的蒸汽激活生物炭对水中 SMT 吸附的影响。与传统的非活性慢速热解生物炭相比，蒸汽激活生物炭的性质和吸附能力得到了比较。吸附表现出明显的 pH 依赖性，这与 SMT 形态和生物炭电荷特性一致。吸附参数与生物炭性质（如摩尔元素比、表面积和孔体积）之间存在线性关系。等温线数据很好地用 Freundlich 和 Temkin 模型描述，表明 SMT 和生物炭之间存在有利的化学吸附过程和静电相互作用。在 pH 3 下，700°C 下制备的蒸汽激活生物炭的吸附容量最高（37.7 mg g(-1))，与在相同温度下制备的非激活生物炭相比，吸附容量增加了 55%。因此，与传统的热解相比，蒸汽激活可能会增强生物炭的吸附能力。
