[1] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China
[2] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China
[3] Hunan Univ, Sch Phys & Elect, Key Lab Low Dimens Struct Phys & Devices, Changsha 410082, Hunan, Peoples R China
[4] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China