Heterogeneous Fe(II) oxidation and zeta potential |
| |
| Authors: | Andrew Barnes Devin J Sapsford Mathew Dey Keith P Williams |
| |
| Institution: | aSRK consulting (UK) Ltd, Floor 5, Churchill House, Churchill Way, Cardiff, CF10 2HH, UK;bCardiff School of Engineering, Cardiff University, Cardiff, CF24 3AA, UK |
| |
| Abstract: | The determination of electrophoretic mobility and zeta potential was used as a diagnostic tool, alongside kinetic experiments, to delineate between three plausible mechanisms for the heterogeneous oxidation of Fe(II) by dissolved oxygen. One of these mechanisms is dependant on the positive surface charge that exists on Fe(III) (oxy)hydroxide surfaces at pH values below the Iso-Electric Point (IEP). However, this mechanism can be disputed as catalysis is observed on Fe(III) (oxy)hydroxide surfaces above the IEP despite a negative zeta potential. As well as an IEP shift an overall reduction of the magnitude of the zeta potential is observed in samples of field Fe(III) (oxy)hydroxide collected from the Taff Merthyr mine water treatment site in South Wales, UK. Low zeta potentials determined in mine water treatment systems will have beneficial effects for particle coagulation and settling in passive mine water treatment systems. |
| |
| Keywords: | Heterogeneous iron oxidation Fe(III) (oxy)hydroxides Zeta potential Mine water treatment |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
