Profile image of Ellen Moon

Dr Ellen Moon

STAFF PROFILE

Position

Senior Lecturer, Environmental Engineering

Faculty

Faculty of Sci Eng & Built Env

Department

School of Engineering

Campus

Geelong Waurn Ponds Campus

Contact

ellen.moon@deakin.edu.au
+61 3 522 78656

Research interests

My research focusses on heavy metals in the environment: how they move through landscapes, the risk they pose, and how to clean them up.

My research combines

  • Field- and lab-based chemistry
  • Advanced spectroscopic and scattering techniques
  • Geochemical modelling

to understand the molecular-scale processes that underpin landscape-scale geochemistry. Research highlights include:

Mineral transformations in coastal acid sulfate soils

The formation and persistence of the meta-stable iron sulfide mineral greigite is an important step in the remediation of coastal acid sulfate soils, but the response of greigite to periods of oxygenation (for example, during a neap tide) is poorly understood. In this study, we employed X-ray absorption spectroscopy to identify the Fe and S speciation and mineralogy resulting from the oxidative disintegration of synthetic greigite under neap tide conditions. Results indicate divergent Fe and S mineralization pathways culminating in elemental sulfur and iron (hyr)oxide minerals. No sulfate-containing minerals were identified, and under all conditions tested, residual greigite remained. The oxidation products, and the presence of sulfur reducing bacteria, provide the right chemical environment for the reformation of greigite during the sub-oxic conditions of the rest of the tidal cycle. This likely explains the persistence of greigite in the intertidal zone, and implies that the oxidation of greigite is not detrimental to the long term stability of the acid sulfate soil remediation process.

Bushfires mobilize arsenic in Australian soils

Fires in iron-rich seasonal wetlands can thermally transform soil minerals and alter their crystallinity. However, the fate of As associated with thermally transformed iron minerals is unclear. We subjected As(V)-coprecipitated schwertmannite to thermal transformation (200-800 °C). Heating to >400 °C caused transformation of schwertmannite to a nanocrystalline hematite with greater surface area and smaller particle size. Higher temperatures also caused the initially structurally incorporated As to become progressively more exchangeable, increasing surface-complexed As by up to 60-fold, thereby triggering enhanced As mobilization upon reflooding. Further research is warranted to unravel the wider implications for water quality in natural wetlands.

Adapting uranium mineral processing circuits to tolerate seawater

Using X-ray absorption spectroscopy, we identified the mechanism by which chloride impacts the extraction of U(VI) by a weak base anion exchange resin from acidic sulfate solutions. The amount of chloride present affects U(VI) speciation both in the feed solutions and adsorbed by the resin, and we find three distinct U(VI) species taken up by the resin across the salinity gradient, directly corresponding to changes in levels of U(VI) extraction. These findings are integral to the effective design of mineral processing circuits incorporating seawater—a cheaper and more sustainable water source than fresh water.

Units taught

SEV201 - Environmental Health Engineering

SEJ441 - Engineering Project A

SEJ446 - Engineering Project B

Publications

Filter by

2019

Calcium coordination environment in precursor species to calcium carbonate mineral formation

J Avaro, E Moon, J Rose, A Rose

(2019), Vol. 259, pp. 344-357, Geochimica et cosmochimica acta, Amsterdam, The Netherlands, C1-1

journal

Insights on uranium uptake mechanisms by ion exchange resins with chelating functionalities: chelation vs. anion exchange

J Amphlett, S Choi, S Parry, E Moon, C Sharrad, M Ogden

(2019), pp. 1-11, Chemical engineering journal, Amsterdam, The Netherlands, C1

journal
2018

REE behavior and sorption on weak acid resins from buffered media

J Bezzina, M Ogden, E Moon, K Soldenhoff

(2018), Vol. 59, pp. 440-455, Journal of Industrial and Engineering Chemistry, Amsterdam, The Netherlands, C1-1

journal

Dissolution and redistribution of trace elements and nutrients during dredging of iron monosulfide enriched sediments

G Choppala, E Moon, R Bush, N Bolan, N Carroll

(2018), Vol. 201, pp. 380-387, Chemosphere, Amsterdam, The Netherlands, C1-1

journal
2017

Application of chelating weak base resin Dowex M4195 to the recovery of uranium from mixed sulfate/chloride media

M Ogden, E Moon, A Wilson, S Pepper

(2017), Vol. 317, pp. 80-89, Chemical Engineering Journal, Amsterdam, The Netherlands, C1-1

journal

Oxidative transformation of iron monosulfides and pyrite in estuarine sediments: Implications for trace metals mobilisation

G Choppala, R Bush, E Moon, N Ward, Z Wang, N Bolan, L Sullivan

(2017), Vol. 186, pp. 158-166, Journal of Environmental Management, London, Eng., C1-1

journal

Divergent Fe and S mineralization pathways during the oxidative transformation of greigite, Fe?S?

E Moon, R Bush, D Gibbs, J Mata

(2017), Vol. 468, pp. 42-48, Chemical Geology, Amsterdam, The Netherlands, C1-1

journal

Impact of chloride on uranium(VI) speciation in acidic sulfate ion exchange systems: towards seawater-tolerant mineral processing circuits

E Moon, M Ogden, C Griffith, A Wilson, J Mata

(2017), Vol. 51, pp. 255-263, Journal of Industrial and Engineering Chemistry, Amsterdam, The Netherlands, C1-1

journal

Ecological restoration of a severely degraded coastal acid sulfate soil: a case study of the East Trinity wetland, Queensland

H Luke, M Martens, E Moon, D Smith, N Ward, R Bush

(2017), Vol. 18, pp. 103-114, Ecological Management and Restoration, Richmond, Vic., C1-1

journal
2016

Arsenic mobilization is enhanced by thermal transformation of schwertmannite

Scott Johnston, Edward Burton, Ellen Moon

(2016), Vol. 50, pp. 8010-8019, Environmental science & technology, Washington, D.C., C1-1

journal
2013

Towards an understanding of thallium isotope fractionation during adsorption to manganese oxides

S Nielsen, L Wasylenki, M Rehkmper, C Peacock, Z Xue, E Moon

(2013), Vol. 117, pp. 252-265, Geochimica et cosmochimica acta, Amsterdam, The Netherlands, C1-1

journal

Modelling Cu(II) adsorption to ferrihydrite and ferrihydrite-bacteria composites: deviation from additive adsorption in the composite sorption system

E Moon, C Peacock

(2013), Vol. 104, pp. 148-164, Geochimica et cosmochimica acta, Amsterdam, The Netherlands, C1-1

journal
2012

Adsorption of Cu(II) to ferrihydrite and ferrihydrite-bacteria composites: importance of the carboxyl group for Cu mobility in natural environments

E Moon, C Peacock

(2012), Vol. 92, pp. 203-219, Geochimica et cosmochimica acta, Amsterdam, The Netherlands, C1-1

journal

Oxidative scavenging of thallium by birnessite: explanation for thallium enrichment and stable isotope fractionation in marine ferromanganese precipitates

C Peacock, E Moon

(2012), Vol. 84, pp. 297-313, Geochimica et cosmochimica acta, Amsterdam, The Netherlands, C1-1

journal
2011

Adsorption of Cu(II) to Bacillus subtilis: A pH-dependent EXAFS and thermodynamic modelling study

E Moon, C Peacock

(2011), Vol. 75, pp. 6705-6719, Geochimica et Cosmochimica Acta, Amsterdam, The Netherlands, C1-1

journal

Funded Projects at Deakin

No Funded Projects at Deakin found

Supervisions

No completed student supervisions to report