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

Abstract

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-Fe3O4) using sonochemical technology. Characterization of the physical and chemical properties of HA-Fe3O4 was carried out using FTIR, XRD, SEM and VSM. HA-Fe3O4 was used for recovery of gold from simulated gold waste (HAuCl4). FTIR characterization showed that the interaction between HA and Fe3O4 was through hydrogen bonds. The crystal size of HA-Fe3O4 using the Debye-Scherrer equation based on the XRD diffractogram was 12.4 nm. The saturation magnetization value of HA-Fe3O4 obtained was 52.80 emu/g. Adsorption studies at various pH showed that HA-Fe3O4 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).

Eliminating waste with waste: transforming spent coffee grounds into microrobots for water treatment

“…The alteration suggests that the -OH functional groups present in SCGs play a role in binding with IONPs. 66,67 Within the widened CvO spectral absorption band at 1741 cm −1 for CoffeeBots, a weak peak appears around 1712 cm −1 , as exhibited in Fig. 2C.…”

“…The evidence strongly indicates that different intermolecular forces, such as hydrogen bonding, are responsible for the attractive interactions between SCGs and IONPs. 66,67…”

“…The evidence strongly indicates that different intermolecular forces, such as hydrogen bonding, are responsible for the attractive interactions between SCGs and IONPs. 66,67 To gain a deeper understanding of the interactions between SCGs and IONPs, we performed Fourier transform-Infrared (FTIR) spectroscopy on SCGs alone, IONPs alone, and CoffeeBots. The FTIR spectrum of bare SCGs, shown in Fig.…”

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“…The crystal size determined the crystallinity of Fe3O4-TD. The smaller the crystal size, the better the crystallinity of the particles [13,14,15]. Figure 4 presents the particle size of Fe3O4-TD.…”