Modification Bentonite Using Fe(III) and Its Application as Adsorbent for Phenol

Abstract

Modification of bentonite material using doping Fe(III) was conducted. The purpose of this study is to increase the capacity and effectiveness of bentonite adsorption. The characterization of material was carried out using XRD, XRF, BET and FTIR spectrophotometers. The material produced were used as an adsorbent of phenol in an aqueous medium. The result of characterization material using XRD analysis was showed the difference between unmodified bentonite and modified bentonite, it is indicated from a shift of diffraction peak at 3-10°. The result of XRF analysis was showed the increasing of the iron element on doped bentonite, from 21.3 to 59.11%. The result of BET analysis was showed isotherm adsorption fitted to type IV, which indicates bentonite has a mesoporous type with a size 5-50 nm and natural bentonite has a smaller pore size than activated and doped bentonite. From the FTIR spectrum, there is no chemical interaction between adsorbent and adsorbate. The adsorption rate was fitted to pseudo-first-order. The maximum capacity of phenol adsorption at 60 minutes for controlled was 7.186% and for doped bentonite was 16.4651%. Thermodynamics study explained that the adsorption process occurred spontaneously. It can be concluded that modification bentonite use doping Fe(III) can enhance its ability to adsorbed phenol.