This work was supported by the National Basic Research Program of China (973 Program) (Nos. 2013CB934104 and 2012CB224805), the National Natural Science Foundation of China (Nos. 51372041 and 51422202), the specialized research fund for the doctoral program of higher education of China (No. 20120071110007), the innovation program of Shanghai Municipal Education Commission (No. 13ZZ004), State Key Laboratory of Pollution Control and Resource Reuse Foundation (No. PCRRF14017), and the Program for New Century Excellent Talents in University (No. NCET-12-0123). We extend our appreciation to the Deanship of Scientific Research at King Saud University for funding the work through the research group project No. RGP-227.
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