Incorporation of Fe(iii) into Bentonite and Study of its As3+ Adsorption Properties

Bentonite is montmorillonite type layered clay and has high cation exchange capacity (CEC) because of its typical silicate structure. The bentonite was treated with hydrochloric acid to obtain H-bentonite which further modified by incorporating Fe(Ⅲ) into it. Fe-bentonite characterized XRD FTIR analyses. specific surface area the adsorbent obtained from Methylene Blue Adsorption Method 598 m2/g. adsorption As3+ in aqueous environment investigated varying different experimental parameters such as pH, contact time isotherm. process found be best fitted Langmuir isotherm model controlled pseudo-second –order kinetics rate constant value 0.03723 g/(mg.min). maximum arsenic observed at pH 5 room temperature. taken reach equilibrium 75 minutes. for on 101.01 mg/g. ∆G (-21 kJ/mole) confirmed favored physiosorption. slope linear plot Qt vs t0.5 but not passed through origin, indicated that, intraparticle diffusion only controlling step.