SINTESIS MAGNETIT Mg/Al-NO3 HIDROTALSIT (UMHT) DENGAN BANTUAN METODE SONOKIMIA DAN APLIKASINYA SEBAGAI ADSORBEN [AuCl4]

• Main Authors: , NIA WAHYU D H, , Prof. Dr. Sri Juari Santosa, M.Eng
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2013
• Subjects: ETD
• Online Access: https://repository.ugm.ac.id/124511/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=64664
• Institution: Universitas Gadjah Mada

Magnetite Mg/Al-NO3 hydrotalcite has been synthesized with the assistance of sonochemistry method using the ultrasound irradiation (UMHT) and its application to adsorp [AuCl4]- has been studied. The synthesis was done by a coprecipitation method of Mg(NO3)2 and Al(NO3)3 at pH 11 with Mg2+/Al3+ molar ratio (2 : 1). The effect of calcination on the adsorption ability was studied by first calcinating the UMHT at temperature 450 °C to form calcinized UMHT (CUMHT). The synthesized UMHT and CUMHT were characterized using Fourier Transform Infra-red (FTIR) spectroscopy and X-ray Diffration (XRD). The application of UMHT and CUMHT as adsorbents of [AuCl4]- was studied by examining the effect of pH, adsorption kinetics and isotherm. Desorption of [AuCl4]- from UMHT and CUMHT was performed to analyze the possibility to recover [AuCl4]-. The result showed that the distribution of magnetite on hydrotalcite structure changed the Mg/Al-NO3 hydrotalcite to have not only a good adsorption ability but also magnetic properties so that the separation process was able to be done easily by employing external magnetic field. The adsorption of [AuCl4]- by both UMHT and CUMHT was optimum at pH 3, followed the pseudo-second order adsorption kinetics with adsortion rate constant 0.007 g/mg minute for UMHT and 0.003 g/mg minute for CUMHT. The adsorption capacity of UMHT for [AuCl4]- as determined according to Langmuir isoterm model was 71.43 mg/g and that of CUMHT as determined according to Freundlich isoterm model was 11.65 mg/g. Calcination treatment of UMHT could destroy the UMHT structure and was unable to enhance the adsorption capacity.