1. Engineering Research Center of Coal-based Ecological Carbon Sequestration Technology of the Ministry of Education, Shanxi Datong University, Datong, Shanxi Province 037009, PR China
2. Key Laboratory of National Forest and Grass Administration for the Application of Graphene in Forestry, Shanxi Datong University, Datong, Shanxi Province 037009, PR China
3. School of Chemistry and Chemical Engineering, Shanxi Datong University, Datong, Shanxi Province 037009, PR China
4. Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada