The synergism of andisol soil and foundry sand mixture as Cu(II) ion adsorbent

Abstract

Abstract The aims of this study were to determine Cu(II) metal ion adsorption ability by using andisol soil and foundry sand as an adsorbent. Andisol soil and foundry sand were activated with 3 M NaOH. Adsorption of copper (II) metal ion performed on the composition of andisol soil and foundry sand 100:0, 75:25, 50:50, 25:75, and 0:100 (wt%), pH solution variation pH 3-7, and contact time 15-135 minutes with batch system. The final concentration at the time of equilibrium was measured using Atomic Absorption Spectrometry (AAS). Characterizations of the adsorbent was conducted by Fourier Transform-Infrared Analyzer (FT-IR), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX), and Surface Area Analyzer (SAA). The optimum condition for Cu(II) ion adsorption was obtained at the composition of the mixture andisol soil and foundry sand 75:25 (wt%) at pH 6 and contact time of 90 minutes with an adsorption capacity of 3.839 mg/g and adsorption percentage 94.55%. The adsorption isotherm followed the Langmuir isotherm model and the adsorption kinetics are pseudo-second-order.