BENTONIT TERMODIFIKASI MAGNETIT BERBASIS METODE KOPRESIPITASI SEBAGAI ADSORBEN Cr(III) DALAM LARUTAN BERAIR; MAGNETIZED BENTONITE BASED CHEMICAL COPRECIPITATION METHOD AS ADSORBENT FOR Cr(III) REMOVAL FROM AQUEOUS SOLUTION

RIZKI MUFIDAYANTI, Suyanta

2016 | Skripsi | FMIPA

Modified magnetite of bentonite based chemical coprecipitation have been studied about method of magnetized bentonite synthesis and its application as an adsorben Cr(III). The research was conducted with HCl activation of bentonite and modified bentonite synthesis of magnetite by using a mixture solution of FeCl3·6H2O and the addition of NH4OH to pH 11 were reacted at a temperature of 85 °C. Results magnetized bentonite were characterized using XRD (X-ray Diffraction) and FTIR (Fourier Transform Infra Red). The characterization of bentonite indicate content mineral of bentonite were montmorillonite, quartz, K-feldspar, cristobalite, and illite. Activated bentonite and magnetic bentonite were used as an adsorbent Cr(III). The optimum time of activated bentonite and magnetic bentonite to Cr(III) has been determined. The amount of Cr(III) (10 mg L-1) were adsorbed on the activated bentonite (0.01 g) after 60 minutes was 8.23 mg g-1 and a magnetic bentonite after 5 minutes was 9.49 mg g-1. The experimental adsorption data of activated bentonite and magnetic bentonite followed pseudo-second-order kinetic model of Ho and McKay and Freundlich isotherm. Recovery testing with an external magnetic field on magnetized bentonite adsorbent can be done easily and fast.

Kata Kunci : bentonite, magnetite, adsorption, Cr(III)