| dc.description.abstract | A lot of dye pollutants were released in the aquatic environment as waste from industrial coloring
process. This research aimed to study silica gels (SG) as a potential adsorbent to remove the dyes. The
SG can be synthesized from coal fly ash (FA), which is industrial solid waste rarely utilized, using the
sol-gel method. Its properties were then characterized by FTIR, XRD, SEM, and isothermal ads-des N
2
.
As a result, FTIR spectra and XRD diffractogram exhibited the successfully SG synthesized from FA
with the amorphous structure. The image analysis using SEM demonstrated that SG particles are
spherical. The isotherm type, based on isotherm ads-des N
2
, is type II without hysteresis loop which
represents the nonporous material SG with the surface area and pore diameter of 25.977 m
2
/g and 1.52
nm, respectively. The adsorption capacity performance of SG to remove methylene blue (MB) as a basic
dye is 62.70 % which is higher than FA, following Langmuir isotherm adsorption model. The kinetics of
adsorption rate of SG are based on the pseudo second order models accelerated by 3.37 times faster
than FA. | en_US |
