Global Geology     2008 11 (3):  188-190    ISSN: 1673-9736:  CN: 22-1371/P Research on purification and modification of I/S bentonite Deli YU, Shufeng LIU, Liyu TIAN, Peiping ZHANG Received null  Revised null  Online 2008-09-25 Reference   Corresponding author: