1. Department of Environmental Engineering School of Metallurgy and Environment Central South University Changsha 410083 China
2. Fuels and Energy Technology Institute and Western Australia School of Mines: Minerals Energy and Chemical Engineering Curtin University Perth WA 6102 Australia
3. Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA
4. State Key Laboratory of Chem/Bio‐Sensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha 410082 Hunan China