supported by MOE under AcRF Tier 2(ARC 26/13,No.MOE2013-T2-1-034;ARC 19/15,No.MOE2014-T2-2-093);AcRF Tier 1(RGT18/13,RG5/13);NTU under Start-Up Grant(M4081296.070.500000);iFood Research Grant(M4081458.070.500000);Singapore Millennium Foundation in Singapore;the National Natural Science Foundation of China(GZ213054,51322202)in China;the Natural Science Foundation of Jiangsu Province(BK20130927);supported by the Singapore National Research Foundation under its Environmental&Water Technologies Strategic Research Programme and administered by the Environment&Water Industry Programme Office(EWI)of the PUB;conducted by NTU-HUJ-BGU Nanomaterials for Energy and Water Management Programme under the Campus for Research Excellence and Technological Enterprise(CREATE);supported by the National Research Foundation,Prime Minister’s Office,Singapore~~