6Ponder SM,Darab JG,M a llouk TE. Rem ediation of Cr(VI) and Pb (II) aqueous solutions using supported, nanoscale zero-- vaent iron[J]. Environmental Science & Technology,2000(34) : 2 564-2 569.
8Chisholm J E. An X . raypowder-- diffractionstudyofpalygorskite[J]. Can Minerai,1990(18) :329-339.
9Chisholm J E. Powder--diffraction Patterns and str--tural Models for Palygorskite[J]. Can Mineral, 1992 ( 32) : 61 - 73.
10Chiari G Giustetto R, Ricchiardi G. Crystal struc-ture refinements of palygorskite and Maya Blue from m--olecular model ling and powder synchrotron diaffractio-n. Eur[J]. Mineral, 2003(15):21-33.
