▎ 摘　　要

Dehydrochlorination of 1,1,2,2-tetrachloroethane (TeCA) in graphene oxide (GO)-based materials-water two-phase system can be enhanced strongly. However, the dehydrochlorination kinetic of adsorbed TeCA on GO-based materials' surface is still unclear. Thus, in this study the dehydrochlorination kinetics of adsorbed TeCA on GO based-materials' surface was compared to the kinetics of dissolved TeCA in aqueous solution. The results showed that the dehydrochlorination kinetic constants of adsorbed TeCA on GO-based materials' surface (k(s-F)) were much greater than those of dissolved TeCA in aqueous solution (k(a)) due to the deprotonated surface oxygen-containing functional groups (e.g. -COO-, and -O-.) served as conjugated bases to catalyze the reaction. In particular, at pH 8.0 and 9.0, the kss values for GO (20 mg/L) were approximately 3 orders magnitude greater than k(a) values. Furthermore, the k(s-F) values of adsorbed TeCA for the low concentration of GO (20 mg/L) were always greater than that for the high concentration of GO (100 mg/L). The primary mechanism was that GO was apt to aggregate at high concentration, which enhanced the steric hindrance between.O-containing functional groups and TeCA molecular. Consequently, the interfacial effects of GO-based materials at their low concentration could strongly enhance the transformation of adsorbed TeCA in aqueous environment. (C) 2016 Elsevier B.V. All rights reserved.