Copper Removal in Tequila and Ethyl Alcohol by Cementation

Abstract

In this paper results of copper removal in ordinario and ethyl alcohol by cementation using an iron rod as a sacrifice anode are presented. Experiments were performed in ordinario containing copper without controlling pH and in an acetate buffer. Concentration before and after cementation were determined by atomic absorption spectroscopy. The highest removal efficiency of Cu (II) in ethyl alcohol and ordinario without buffer occurs at pHs of 4.8 and 3.3 respectively, with 49% removal in both cases. On the other hand, the highest removal percentage of Cu(II) in ethyl alcohol and ordinario at buffered conditions and pHs of 4.9 and 3.0 are 52.1 and 61.1% respectively, the major removal efficiency appears at more acidic pHs because iron has a major facility to oxidize in acidic pH.

Electrophoretic Deposition of Out‐of‐Plane Oriented Active Material for Lithium‐Ion Batteries

“…This result points toward the possibility of interference of the anode in the EPD process. It is already known that the anodic dissolution rate of aluminum in water–alcohol mixtures is significantly higher than that of copper and stainless steel, [ 48 ] and that acidified alcohol can accelerate it further. [ 49 ] Consequently, we can infer that the out‐of‐plane deposition of Co 3 O 4 –mica flakes seen only for the case of the aluminum anode being used in our study is somehow promoted by the electrochemical corrosion of that anode.…”

Characterization for EIS of a Modified Graphite Electrode in a Hexane/CTAB- (CTA)4[Fe(CN)6]-Butanol/Water Microemultion

“…The first (A) and second equivalent circuit (B) consider an electron transfer resistance, while the third one (C) shows a series of additional capacitances, that can be associated with the double layer capacitance at the electrode surface for a uncoated or coated electrode surface (16). The existence of a constant phase element (CPE) in tandem with a resistance is to consider the effects of the electrode porosity (17), and the Warburg´s element is associated with the diffusion of ferrocyanide ions through the surfactant tails of the adsorbed surfactant molecules at the electrode surface.…”

Analysis of Cu in Mezcal Commercial Samples using Square Wave Anodic Stripping Voltammetry

“…The presence of metallic ions in alcoholic beverages is a common occurrence caused mainly by the use of metal equipment during the distillation or fermentation processes [1,2]. For example, copper is ubiquitous in tequila and mezcal (representative Mexican alcoholic beverages) mainly due to the corrosion of the copper pot distillation stills [3]. Some producers consider that distillation must be performed in stainless steel equipment fitted with a copper coil or else in pure copper stills, because the presence of copper is necessary to guarantee different organoleptic properties [4,5].…”