College of Environmental Science and Engineering/Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin 300071, China.
Environ Pollut. 2015 Jan;196:371-8. doi: 10.1016/j.envpol.2014.10.027.
The abiotic transformation of nanomaterials in the natural environment can significantly affect their fate,transport, and effects. We observed that the adsorption affinities of graphene oxide nanoparticles(GONPs) for both phenanthrene and 1-naphthol were profoundly enhanced in the presence of sulfide, an environmentally relevant reductant, with doses as low as 0.5 mM Na(2)S per 10 mg/L GONPs. For phenanthrene adsorption enhancement was predominantly caused by the increased surface hydrophobicity from Na(2)S treatment. For 1-naphthol, however, adsorption enhancement was caused mainly by the conversion of the epoxy/ether groups on the surface of graphene oxide (GO) to the phenolic hydroxyl and carbonyl groups, which allowed more significant H-bonding between 1-naphthol and GONPs. The findings of this study underline that abiotic transformation of GO not only affects the stability and mobility of GONPs, but also influences the adsorptive interactions between GONPs and environmental contaminants, and consequently, may increase the environmental risks of GONPs.
纳米材料在自然环境中的非生物转化会显著影响其归宿、迁移和效应。我们观察到，在环境相关还原剂硫化物存在的情况下，氧化石墨烯纳米颗粒（GONPs）对菲和 1-萘酚的吸附亲和力得到了极大的增强，低至每 10 mg/L GONPs 用 0.5 mM Na(2)S。对于菲的吸附增强主要是由于 Na(2)S 处理增加了表面疏水性。然而，对于 1-萘酚，吸附增强主要是由于氧化石墨烯（GO）表面的环氧/醚基团转化为酚羟基和羰基基团，这使得 1-萘酚和 GONPs 之间能够发生更显著的氢键相互作用。本研究结果表明，GO 的非生物转化不仅会影响 GONPs 的稳定性和迁移性，还会影响 GONPs 与环境污染物之间的吸附相互作用，从而可能增加 GONPs 的环境风险。
