MA Yan1**, HU Bing-Jie1, ZHANG Ya-Ru1, ZHANG Fan1**, WANG Jian-Bing1, YU Cai-Hong1, ZHANG Da-Ding1,2
1. School of Chemical and Environmental Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China; 2. Center International Group Co.Ltd.,Beijing 100176,China