|About this Abstract
||Part C-1: Hydrometallurgy 2018
||Insights into the Surface Chemistry of Activated Carbon-catalyzed Arsenic Oxidation
||Chengqian(Charles) Wu, Rebecca Radzinski, Ahmad Ghahreman
|On-Site Speaker (Planned)
Arsenic is a highly toxic element commonly associated with gold/copper-bearing ores. The arsenic immobilization is becoming increasingly crucial for mining and metallurgical operations. Activated carbon-catalysed arsenic oxidation is a promising process that employs oxygen as the sole oxidant. Surface chemistry is a significant and complex factor driving the catalyzed process which involves the oxidation and adsorption of arsenic species, occurring simultaneously. X-ray photoelectron spectroscopy was employed to examine the surface of activated carbon, treated with As(III) and/or As(V) solutions. Approximately 25% of the elements on the carbon surface was determined to correspond to O 1s spectra indicating large amounts of oxygen functional groups on the activated carbon surface which help the arsenic oxidation. Freundlich adsorption isotherm model was determined to best describe the characteristics of the activated carbon for As(III) and As(V) adsorption with an n parameter of 1.01 and a KF value of 0.01.
||Planned: At-meeting proceedings