The various purification methods have been developed to improve the quality
local salt, the NaCl content > 94%. Bentonite is one of materials used as
binder impurities in purification. The purpose of the study was to synthesis
a modified bentonite using alkaline solution, which includes natrium
hydroxide (NaOH) and potassium hydroxide (KOH) with various concentrations
(1, 1.5, 2, and 2.5 M) and determined level of Na+, Ca2+ and Mg2+ metals
using AAS. The bentonite and activating agent 1 M (1:10) were stirred for
three hours. Then, the bentonite was dried for two hours in an oven at
110?C. The activated bentonite was dried for four hours at 170?C. The
activated bentonite was characterized using analytical techniques, such as
XRD, FTIR, and SEM. The basal spacing d001 on the diffractogram bentonite
was significantly unaffected by alkaline activation. FTIR analysis
represents the stretching vibration of -OH shifts towards a lower
wavenumber. Alkaline activation reduced impurities from bentonite and
increase the pore surface's porosity. NaCl levels in people's salt increased
after being activated using alkaline. The increase in Na+ levels was
followed by decrease content of Ca2+ and Mg2+ metals. KOH-activated
bentonite had a higher NaCl level than NaOH-activated bentonite.