1. Department of Environmental Chemistry and Materials, Faculty of Environmental Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan, Department of Industrial Chemistry, Mizushima High School of Engineering, 1230 Nishiachi-cho, Kurashiki, Okayama 710-0807, Japan, and Research and Development Division, Kurita Water Industries Ltd., 7-1 Wakamiya, Morinosato, Atsugi, Kanagawa 243-0124, Japan