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Sonochemical technology is a technology that involves ultrasonic waves in chemical reactions. In this study, humic acid isolated from peat soil has been successfully modified with magnetite (HA-Fe 3 O 4 ) using sonochemical technology. Characterization of the physical and chemical properties of HA-Fe 3 O 4 was carried out using FTIR, XRD, SEM and VSM. HA-Fe 3 O 4 was used for recovery of gold from simulated gold waste (HAuCl 4 ). FTIR characterization showed that the interaction between HA and Fe 3 O 4 was through hydrogen bonds. The crystal size of HA-Fe 3 O 4 using the Debye-Scherrer equation based on the XRD diffractogram was 12.4 nm. The saturation magnetization value of HA-Fe 3 O 4 obtained was 52.80 emu/g. Adsorption studies at various pH showed that HA-Fe 3 O 4 has been successful in recovering of gold from simulated gold waste. The % recovery of gold was 99%. Gold recovery occurs through the adsorption process followed by reduction of Au (III) to Au(0).

Modified Humic Acid from Peat Soils with Magnetite (Ha-Fe3O4) by Using Sonochemical Technology for Gold Recovery