Abstract：
:The novelty of this communication lies in the use of a Ti-RuO2 anode which has not been tested for the oxidation of free cyanide in alkaline media at concentrations similar to those found in wastewater from the Merrill Crowe process (100 mg L-1 KCN and pH 11), which is typically used for the recovery of gold and silver. The anode was prepared by the Pechini method and characterized by SEM. Linear sweep voltammetries on a Ti-RuO2 rotating disk electrode (RDE) confirmed that cyanide is oxidized at 0.45 < E < 1.0 V vs SHE, while significant oxygen evolution reaction (OER) occurred. Bulk oxidation of free cyanide was investigated on Ti-RuO2 meshes fitted into a filter-press electrolyzer. Bulk electrolyzes were performed at constant potentials of 0.85 V and 0.95 V and at different mean linear flow rates ranging between 1.2 and 4.9 cm s-1. The bulk anodic oxidation of cyanide at 0.85 V and 3.7 cm s-1 achieved a degradation of 94%, with current efficiencies of 38% and an energy consumption of 24.6 kWh m-3. Moreover, the degradation sequence of cyanide was also examined by HPLC.
journal_name
Chemospherejournal_title
Chemosphereauthors
Pérez T,López RL,Nava JL,Lázaro I,Velasco G,Cruz R,Rodríguez Idoi
10.1016/j.chemosphere.2017.02.136subject
Has Abstractpub_date
2017-06-01 00:00:00pages
1-6eissn
0045-6535issn
1879-1298pii
S0045-6535(17)30325-9journal_volume
177pub_type
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