The reduction of nitrobenzene by sulfide in aqueous solutions mediated by graphene oxides
The main objective of this study was to test the possibility that graphene-based nanomaterials can catalyze environmentally relevant abiotic redox reactions of organic contaminants.We investigated the effect of graphene oxide (GO) on the reduction of nitrobenzene by Na2S in aqueous solutions.With the presence of GO (typically 5 mg/L),the observed pseudo-first-order rate constant (kobs) for the reduction of nitrobenzene was raised by nearly two orders of magnitude (from 9.39 × 10-5 h-1 to 7.68 × 10-3 h-1),strongly suggesting the catalytic role of GO in the reaction.As reflected by the combined spectroscopic analyses,GO was reduced in the beginning of the reaction,and hence the reduced GO (RGO) catalyzed the reduction of nitrobenzene.It was proposed that the zigzag edges of RGO acted as the catalytic active sites,while the basal plane of RGO served as the conductor for the electron transfer during the catalytic process.Furthermore,solution chemistry conditions (pH and dissolved humic acid) were found to greatly influence the catalytic activity of RGO.The results imply that graphene-based nanomaterials may effectively mediate the reductive transformation of nitroaromatic compounds and can contribute to the natural attenuation and remediation of these chemicals.
Heyun Fu Dongqiang Zhu
State Key Laboratory of Pollution Control and Resource Reuse/School of the Environment, Nanjing University, Jiangsu 210093, China
国际会议
2013 International Symposium on Environmental Science and Technology(2013环境科学与技术国际会议)
大连
英文
770-770
2013-06-04（万方平台首次上网日期，不代表论文的发表时间）