Substituent effects on the oxidation reactions of 4-nitrophenol, phenol, 4-methylpheol, and 4-methoxyphenol mediated by reduced graphene oxide in water

文献类型： 外文期刊

第一作者： Pei, Zhiguo

作者： Pei, Zhiguo;Li, Chunmei;Xie, Jieli;Wen, Bei;Zhang, Shuzhen;Li, Lingyun;Sun, Lixiang

作者机构：

关键词： Reduced graphene oxide; Phenolic compound; Oxidation coupling; Mediation; Homolytic bond dissociation energy

期刊名称：COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS （ 影响因子：4.539； 五年影响因子：4.039 ）

ISSN： 0927-7757

年卷期： 2018 年 553 卷

页码：

收录情况： SCI

摘要： Substituent effects of 4-nitrophenol (4-NP), phenol (PE), 4-methylpheol (4-MP), and 4-methoxyphenol (4-MOP) on their oxidative coupling reactions mediated by reduced graphene oxide (rGO) were examined using a batch method. The reaction products were identified as the oligomers of their individual parent compound, and C-C and C-O coupling between phenolic radicals were the main reaction pathways. The oxidative kinetics were well described with pseudo-first order model. The rate constants (k(obs)) of 4-NP, PE, 4-MP and 4-MOP were 0.47 x 10(-3), 1.00 x 10(-3), 2.03 x 10(-3), and 3.53 x 10(-3) h(-1), respectively, following the order 4-NP < PE < 4-MP < 4-MOP. The k(obs) of four phenolic compounds was negative linear correlation with their homolytic bond dissociation energies (BDE(O-H)), suggesting that BDE(O-H) was an effective indicator to predict the oxidation susceptibility of phenolic compounds in rGO system. Dissolved oxygen played a critical role in the oxidation reactions through the formation of superoxide anion (O-2 center dot(-)) on rGO. These O-2 center dot(-) further cleaved the O-H bond of phenolic compounds to produce phenolic radicals, which interacted each other and led to the following oxidative coupling reactions. The finding of this study is important for predicting the environmental fate of rGO and phenolic compounds.

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