Affiliation: | a Centre for Advanced Water Technology, Singapore Utilities International Pte Ltd., Blk 2, #241, Innovation Centre (NTU), 18 Nanyang Drive, Singapore 637723 Fax: +65 (6) 794-2791 b Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, P.R. China |