[1] Nanyang Technol Univ, Sch Civil & Environm Engn, Singapore 639798, Singapore
[2] Huaqiao Univ, Coll Mat Sci & Engn, Xiamen 361021, Peoples R China
[3] Ngee Ann Polytech, Sch Life Sci & Chem Technol, Singapore 599489, Singapore
[4] Nanyang Technol Univ, Singapore Membrane Technol Ctr, Singapore 639798, Singapore