Adsorptive Recovery of Gold (III) from Acidic Chloride Media Using Carbonized Microalgal Residue
- *Corresponding Author:
- Keisuke Ohto
Department of Applied Chemistry
Faculty of Science and Engineering
Saga University, Honjo-machi 1
Saga 840-8502, Japan
E-mail: [email protected]
Received Date: June 06, 2017 Accepted Date: July 10, 2017 Published Date: July 18, 2017
Citation: Khunathai K, Inoue K, Ohto K, Kawakita H, Kurata M, et al. (2017) Adsorptive Recovery of Gold (III) from Acidic Chloride Media Using Carbonized Microalgal Residue. J Chem Eng Process Technol 8: 346. doi: 10.4172/2157- 7048.1000346
Copyright: © 2017 Khunathai K, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Adsorption gel was prepared by carbonizing a residual waste of microalgae generated in the biofuel conversion process. The prepared gel exhibited high affinity and selectivity for Au (III) over other precious and base metal ions in hydrochloric acid. From the adsorption isotherms, the maximum loading capacity of Au (III) on the carbonized microalgae was evaluated as 1.20 mmol/g (236 mg/g), which is much higher than that on the original microalgal residue. Observations by microphotographs, scanning electron microscope, and X-ray diffraction confirmed the formation of metallic Au, suggesting that a redox reaction had taken place between the adsorbent and Au (III) ions during adsorption. Adsorption kinetics was interpreted in terms of pseudo-first order rate expression to evaluate the activation energy of this system as 33.7 kJ/mol.