Abstract
Bentonite was modified through pillarization with metal oxide Cr/Al in 2:1 and 1:2 ratio to obtain larger basal spacing of bentonite-layered structure. Pillarization was conducted via intercalation method at room temperature followed by calcination. The result was characterized by using XRD and FT-IR Spectrophotometer. XRD pattern shown pillarization by Cr/Al 2:1 ratio gave peak at 2θ 5.3° which is correspond to d = 16.4 Å. At 1:2 Cr/Al ratio, peak appears at 2θ 6.4° that is related to d = 13.7 Å. FTIR Spectroscopy measurement gave inconclusive result. The Cr/Al pillared bentonite at 2:1 ratio was applied as adsorbent on Congo red and Direct blue dyes. The result indicates the adsorption follows Freundlich isotherm. Adsorption rate for both dyes follows pseudo-second order with rate constant of pillared bentonite higher than natural one. Adsorption isotherm concludes that Freundlich isotherm is favorable compare to Langmuir. Thermodynamic evaluation suggests that isotherm occurs spontaneously in an exothermic process.
Highlights
One of the most abundant clays mineral naturally occurred is bentonite (Abderrazek, Najoua & Srasra, 2016)
Exchangeable cations within gap between layers can be replaced by larger cations to make the bentonite structure more open, this procedure known as pillarization which has additional purposes i.e. increase strength of the layered structure when it use in elevated temperature (Widjaya, Juwono, & Rinaldi, 2017)
The Cr/Al pillared bentonite as well as pristine bentonite were characterized by using XRD and FTIR and were applied on Congo red and Direct blue adsorption
Summary
One of the most abundant clays mineral naturally occurred is bentonite (Abderrazek, Najoua & Srasra, 2016). The pillared bentonite result was used in Congo red and Direct blue removal. The Cr/Al pillared bentonite as well as pristine bentonite were characterized by using XRD and FTIR and were applied on Congo red and Direct blue adsorption.
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