1. School of Material Science and Chemical Engineering, Ningbo University, Fenghua Road 818, Ningbo, Zhejiang 315211, P. R. China
2. Research Center for Gold Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
3. Faculty of Engineering, Kanagawa University, Rokkakubashi, Kanagawa-ku, Yokohama-shi, Kanagawa 221-8686, Japan