▎ 摘　　要

Chemically converted graphene has been synthesized via the reduction of graphene oxide by using organic bases, including 1,8-diazoicyclo (5, 4, 0) undecene-7, triethylamine and 1,4-diazobicyclo (2, 2, 2) octane, as the reducing agent. The chemical characteristics of these organic bases, especially the dissociation constants (pK(a)), have great influence on the structure and properties of the resultant CCG. Remarkably, the reaction between graphene oxide and some organic bases such as 1,8-diazoicyclo (5, 4, 0) undecene-7 can modify the surface properties of chemically converted graphene for anchoring Pd nanoparticles. The resultant recyclable catalyst exhibits high conversion of 97.2% for yielding biphenyl from coupling bromobenzene and phenylboronic acid. Even after the 5th run, the conversion of bromobenzene can still be as high as 94.2%, indicating excellent recyclability of this catalyst. (C) 2015 Elsevier Ltd. All rights reserved.