1. School of Chemistry and Chemical Engineering Xi'an University of Architecture and Technology Xi'an 710055 P. R. China
2. School of Science Wuhan University of Science and Technology Wuhan 430065 P. R. China
3. State Key Laboratory of Pollution Control and Resource Reuse State Key Laboratory of Analytical Chemistry for Life Science the Frontiers Science Center for Critical Earth Material Cycling School of the Environment School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
4. School of Mechanical and Materials Engineering Washington State University Pullman WA 99164 USA