1. School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, P.R. China
2. State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, P. R. China
3. School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, U.K.
4. Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SE7 2AZ, U.K.