[1] Qingdao Univ Sci & Technol, Coll Chem Engn, State Key Lab Base Ecochem Engn, Qingdao 266042, Peoples R China
[2] Qingdao Agr Univ, Coll Resources & Environm, Qingdao 266109, Peoples R China
[3] Ningxia Univ, State Key Lab High Efficiency Utilizat Coal & Gre, Yinchuan 750021, Peoples R China
[4] Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20740 USA