ADSORPSI ZAT WARNA RHODAMIN B MENGGUNAKAN KOMPOSIT Fe3O4-AMPAS KOPI

Abstract

Adsorption of Rhodamin B Dye with Fe₃O₄-Coffee Grounds Composite has been carried out. The purpose of this study is to determine the optimum time, optimum pH, maximum adsorption capacity and type of adsorption isotherm in rhodamin B dye with Fe₃O₄-Coffee grounds composite. The first stage of     making Fe₃O₄-Coffee grounds composite using the coprecipitation method with FeCl₃‧6H₂O and     Fe(SO₄)₂‧7H₂O was weighed with a molar ratio of 3:2, then combined with coffee grounds. The results showed that the optimum time was obtained at 20 minutes, at the optimum pH at pH 10, and the maximum adsorption capacity obtained was 40.19 mg/g. The results of the determination of the type of isoterm in the adsorption of rhodamin b were obtained by the type of Langmuir isoterm.

Keywords: Rhodamine B, Adsorption, Composite Fe₃O₄-coffee grounds