1. School of Environmental Science, Nanjing Xiaozhuang University, Nanjing, Jiangsu 211171, P. R. China
2. Key Laboratory of Aqueous Environment Protection and Pollution Control of Yangtze River in Anhui of Anhui Provincial Education Department, College of Resources and Environment, Anqing Normal University, Anqing 246011, P. R. China
3. College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, P. R. China