Arsenic immobilization as crystalline scorodite by gas-diffusion electrocrystallization

Guillermo Pozo,Jan Fransaer,Diane Van Houtven,Xochitl Dominguez-Benetton

doi:10.1039/d0re00054j

Abstract

Gas-diffusion electrocrystallization (GDEx) is demonstrated as an effective process for the immobilization of arsenic into stable scorodite.

Highlights

Non-ferrous base metals, such as copper and zinc, are frequently associated with chalcophile elements, such as arsenic and antimony
The E–pH electrochemical equilibrium diagrams provide a useful guide for evaluating the limits of the thermodynamic predominance of solids and metal ions in aqueous solutions.[27]
The effect of temperature at a) 25 °C, b) 50 °C, c) 70 °C, and d) 95 °C, on these states, was calculated for the As–Fe–H2O system, as shown in FPig. 4. These diagramPs were constructed at concentrations of As = 0.22 M and Fe = 1.25 M, and a pressure of 1 bar

Summary

Introduction

Non-ferrous base metals, such as copper and zinc, are frequently associated with chalcophile elements, such as arsenic and antimony. Under the conditions tested of temperature and arsenic precursors, different green precipitates were obtained after the GDEx process, without adding seeds for crystallization (Fig. 5b).

Results

Conclusion