1. Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Sciences and Engineering, Nankai University, Tianjin 300071, China, School of Life Science and Bio-pharmaceutics, Shenyang Pharmaceutical University, Shenyang 110016, China, GSI Environmental Inc., 2211 Norfolk, Suite 1000, Houston, Texas 77098, and Department of Civil and Environmental Engineering, Rice University, MS 519, P.O. Box 1892, Houston, Texas 77251-1892