Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS), CSIC, Avenida Reina Mercedes 10, 41012 Seville, Spain.
U.S. Department of Agriculture, Agricultural Research Service, 439 Borlaug Hall, 1991 Upper Buford Circle, St. Paul, MN 55108, USA.
Molecules. 2022 Nov 1;27(21):7418. doi: 10.3390/molecules27217418.
Biochar is a nanoengineered sorbent proposed to control the contamination derived from the presence of residual concentrations of sulfonamides in soil. In this work, we evaluated the sorption of sulfanilamide (SFA) in commercial biochar (BC) produced at 500 °C from oak hardwood () and its analog activated with 2% (/) Fe (BC-Fe). Subsequently, the effect on dissipation and transport of SFA in untreated soil and soil treated with BC and BC-Fe was also assessed. Laboratory batch studies revealed that BC-Fe increased the sorption of SFA as compared to the pristine BC with K of 278 and 98 L/kg, respectively. The dissipation of SFA in either untreated soil or soil treated with BC or BC-Fe was similar, displaying half-lives ranging between 4 and 6.4 days. Conversely, the concurrent determination of sorption during the incubation experiment showed that lower amounts of SFA in solution at the beginning of the experiments were bioavailable in BC-Fe-treated soil when compared to the rest of the treatments shortly after application. Leaching column studies confirmed the amendment's capability to bind the SFA compound. Therefore, the decrease in bioavailability and movement of SFA in treated soils suggest that biochar soil application can reduce SFA soil and water contamination. According to our results, BC surface modification after Fe activation may be more appropriate for water decontamination than for soil since there were no significant differences between the two types of biochar when added to the soil. Therefore, these outcomes should be considered to optimize the SFA mitigation potential of biochar.
生物炭是一种经过纳米工程设计的吸附剂，被提议用于控制土壤中残留浓度的磺胺类抗生素所造成的污染。在这项工作中，我们评估了商业生物炭（BC）对磺胺（SFA）的吸附作用，这种生物炭是由栎木（oak hardwood）在 500°C 下制成的，其类似物用 2%（/）铁进行了激活（BC-Fe）。随后，还评估了未处理土壤以及用 BC 和 BC-Fe 处理的土壤中磺胺的消解和迁移的影响。实验室批量研究表明，与原始 BC 相比，BC-Fe 增加了磺胺的吸附，其 K 值分别为 278 和 98 L/kg。磺胺在未处理土壤或用 BC 或 BC-Fe 处理的土壤中的消解相似，半衰期在 4 到 6.4 天之间。相反，在孵育实验中同时进行的吸附测定表明，与其他处理相比，在实验开始时溶液中磺胺的初始量较低，在 BC-Fe 处理的土壤中具有生物利用性。淋溶柱研究证实了改良剂对磺胺化合物的结合能力。因此，处理土壤中磺胺的生物利用度和迁移率降低表明，生物炭土壤应用可以减少磺胺对土壤和水的污染。根据我们的结果，BC 在经过 Fe 激活后的表面改性可能更适合用于水的净化，而不是土壤，因为当添加到土壤中时，两种类型的生物炭之间没有明显差异。因此，应该考虑这些结果以优化生物炭对磺胺的缓解潜力。
