Selective Removal of Cl~- and SO_4~(2-) from Seawater Using Ag- and Pb-exchanged Natural Clinoptilolite Zeolites

摘要

The selective removal of Cl and SO_4~(2-) from seawater using Ag- and Pb-exchanged natural zeolites was examined for effective seawater desalination. Japanese clinoptilolite zeolites were treated with AgNO_3 and Pb (NO_3)_2 solutions to prepare Ag- and Pb-exchanged natural zeolites. Ag-exchanged natural zeolite can selectively remove Cl~- from seawater without any Ag— remaining in the seawater after treatment, while Pb-exchanged natural zeolite can selectively remove SO_4~(2-)- from seawater but Pb~(2+) remains in the seawater after treatment.