División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica (IPICyT), Camino a la Presa San José 2055, Col. Lomas 4ª, Sección, San Luis Potosí, SLP 78216, Mexico.
División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica (IPICyT), Camino a la Presa San José 2055, Col. Lomas 4ª, Sección, San Luis Potosí, SLP 78216, Mexico.
Bioresour Technol. 2015 Jan;175:309-14. doi: 10.1016/j.biortech.2014.10.101. Epub 2014 Oct 25.
Graphene oxide (GO) is reported for the first time as electron shuttle to increase the redox conversion of the azo compound, reactive red 2 (RR2, 0.5mM), and the nitroaromatic, 3-chloronitrobenzene (3CNB, 0.5mM). GO (5mgL(-1)) increased 10-fold and 7.6-fold the reduction rate of RR2 and 3CNB, respectively, in abiotic incubations with sulfide (2.6mM) as electron donor. GO also increased by 2-fold and 3.6-fold, the microbial reduction rate of RR2 by anaerobic sludge under methanogenic and sulfate-reducing conditions, respectively. Deep characterization of GO showed that it has a proper size distribution (predominantly between 450 and 700nm) and redox potential (+50.8mV) to promote the reduction of RR2 and 3CNB. Further analysis revealed that biogenic sulfide plays a major role on the GO-mediated reduction of RR2. GO is proposed as an electron shuttle to accelerate the redox conversion of recalcitrant pollutants, such as nitro-benzenes and azo dyes.
氧化石墨烯（GO）首次被报道为电子穿梭体，可增加偶氮化合物活性红 2（RR2，0.5mM）和硝基芳烃 3-氯硝基苯（3CNB，0.5mM）的氧化还原转化。在含有硫化物（2.6mM）作为电子供体的非生物孵育中，GO（5mgL（-1））分别将 RR2 和 3CNB 的还原速率提高了 10 倍和 7.6 倍。GO 还分别将厌氧污泥在产甲烷和硫酸盐还原条件下还原 RR2 的微生物还原速率提高了 2 倍和 3.6 倍。对 GO 的深入表征表明，它具有适当的尺寸分布（主要在 450 和 700nm 之间）和氧化还原电位（+50.8mV），可促进 RR2 和 3CNB 的还原。进一步的分析表明，生物产生的硫化物在 GO 介导的 RR2 还原中起主要作用。GO 被提议作为电子穿梭体，以加速难降解污染物（如硝基苯和偶氮染料）的氧化还原转化。
