División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica (IPICYT), Camino a la Presa San José 2055, Col. Lomas 4a. Sección, C.P. 78216 San Luis Potosí, SLP, Mexico.
Facultad de Ciencias Químicas, Departamento de Investigación en Alimentos (DIA-UAdeC), Universidad Autónoma de Coahuila, Saltillo 25280, Coahuila, Mexico.
Bioresour Technol. 2017 Jan;223:269-276. doi: 10.1016/j.biortech.2016.10.062. Epub 2016 Oct 22.
This work reports the first successful application of graphene oxide (GO) and partially reduced GO (rGO) as redox mediator (RM) to increase the biotransformation of the recalcitrant iodinated contrast medium, iopromide (IOP). Results showed that GO-based materials promoted up to 5.5 and 2.8-fold faster biotransformation of IOP by anaerobic sludge under methanogenic and sulfate-reducing conditions, respectively. Correlation between the extent of reduction of GO and its redox-mediating capacity was demonstrated, which was reflected in faster removal and greater extent of biotransformation of IOP. Further analysis indicated that the biotransformation pathway of IOP involved multiple reactions including deiodination, decarboxylation, demethylation, dehydration and N-dealkylation. GO-based materials could be strategically tailored and integrated in biological treatment systems to effectively enhance the redox conversion of recalcitrant pollutants commonly found in wastewater treatment systems and industrial effluents.
这项工作报道了氧化石墨烯（GO）和部分还原氧化石墨烯（rGO）首次成功应用于作为氧化还原介体（RM），以增加难生物转化的碘造影剂碘普罗胺（IOP）的生物转化。结果表明，GO 基材料分别在产甲烷和硫酸盐还原条件下，使厌氧污泥对 IOP 的生物转化速度提高了 5.5 倍和 2.8 倍。GO 的还原程度与其氧化还原介体能力之间的相关性得到了证明，这反映在 IOP 的去除速度更快，生物转化程度更高。进一步的分析表明，IOP 的生物转化途径涉及多个反应，包括脱碘、脱羧、脱甲基、脱水和 N-脱烷基化。GO 基材料可以通过策略性地设计和集成到生物处理系统中，有效地增强废水处理系统和工业废水中常见的难降解污染物的氧化还原转化。
