Ferrous iron oxidation by molecular oxygen under acidic conditions: The effect of citrate, EDTA and fulvic acid

Jones, Adele M.; Griffin, Philippa J.; Waite, T. David

doi:10.1016/j.gca.2015.03.026

Cited by 113 publications

(54 citation statements)

References 54 publications

(75 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 10 shows, the presence of bitumen can override the retarding effect of low pH on the rates of Fe(II) oxidation. Jones et al 40 showed that in the presence of organics, molecular oxygen can oxidize Fe(II) at lower pH values and that more complex organics, in particular EDTA and fulvic acid, further accelerated oxidation compared to simpler organics, such as citric acid 40 . Bitumen is classified based on three types of organics: asphaltines + saturates, resins, and aromatics 26,27,30,31 .…”

Section: Discussionmentioning

confidence: 99%

Impact of Organics and Carbonates on the Oxidation and Precipitation of Iron during Hydraulic Fracturing of Shale

et al. 2017

View full text Add to dashboard Cite

Hydraulic fracturing of unconventional hydrocarbon reservoirs is critical to the United States energy portfolio; however, hydrocarbon production from newly fractured wells generally declines rapidly over the initial months of production. One possible reason for this decrease, especially over time scales of several months, is the mineralization and clogging of microfracture networks and pores proximal to propped fractures. One important but relatively unexplored class of reactions that could contribute to these problems is oxidation of Fe(II) derived from Fe(II)-bearing phases (primarily pyrite, siderite, and Fe(II) bound directly to organic matter) by the oxic fracture fluid and subsequent precipitation of Fe(III)-(oxy)hydroxides. The extent to which such reactions occur and their rates, mineral products, and physical locations within shale pore spaces are unknown. To develop a foundational understanding of potential impacts of shale iron chemistry on hydraulic stimulation, we reacted sand-sized (150-250 μm) and whole rock chips (cm-scale) of shales from four different formations

show abstract

Section: Discussionmentioning

confidence: 99%

Impact of Organics and Carbonates on the Oxidation and Precipitation of Iron during Hydraulic Fracturing of Shale

et al. 2017

View full text Add to dashboard Cite

show abstract

“…40,[45][46][47][48][49][50][51] The other major applications of NOM characterization are to its role in biogeochemistry, 46,[52][53][54][55][56] and contaminant fate. [57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73] In both of these contexts, NOM participates in reactions as a ligand, [74][75][76][77][78] electron donor/acceptor, 53,56,[79][80][81][82][83][84][85][86][87] electron shuttle (i.e., electron-transfer mediator), [88][89][90]…”

Section: Introductionmentioning

confidence: 99%

Electrochemical characterization of natural organic matter by direct voltammetry in an aprotic solvent

Pavitt

Tratnyek

2019

Environ. Sci.: Processes Impacts

View full text Add to dashboard Cite

show abstract

“…The chemical method for NADPH generation was performed by adding metal oxides (Fe 2 O 3 or MgO) in BG-11 medium containing the EDTA. In the presence of EDTA, the Fe 2 O 3 , and MgO were partially solubilized, even though it has slow dissolution in water (Jones et al, 2015). Similar to the present study, regeneration of NADH in the absence of enzyme was improved using the metal oxides such as carbon containing TiO 2 and P-doped TiO 2 (Jiang et al, 2005; Shi et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…A system that includes an efficient electron transfer with cellular compatibility can be a feasible NADPH generation process. The EDTA and citrate, which are also components of growth media for cyanobacteria, have the characteristics to chelate the metal oxides and act as an electron donor in various reactions (Motekaitis et al, 1980; Jones et al, 2015). Development of a chemical method that exhibits NADPH generation under normal photoautotrophic growth conditions can be a microbial friendly process.…”

Section: Introductionmentioning

confidence: 99%

Metal Oxide Mediated Extracellular NADPH Regeneration Improves Ethanol Production by Engineered Synechocystis sp. PCC 6803

Velmurugan

Incharoensakdi

2019

Front. Bioeng. Biotechnol.

View full text Add to dashboard Cite

The ethanol synthesis pathway engineered Synechocystis sp. PCC 6803 (hereafter Synechocystis ) was used to investigate the influence of metal oxide mediated extracellular NADPH regeneration on ethanol synthesis. The in-vitro studies proved that the metal oxides have the potential to generate the NADPH in the presence of electron donor, the usual components of photoautotrophic growth conditions. When the NADPH regeneration was applied in Synechocystsis , the strain showed improved growth and ethanol production. This improved ethanol synthesis is attributed to the increased availability of NADPH to the ethanol synthesis pathway and redirection of closely related carbon metabolism into the ethanol synthesis. Under optimized light intensity and NADP addition, the maximum ethanol production of 5,100 mg/L was observed in MgO mediated extracellular NADPH regeneration after 25 days of cultivation, which is 2-fold higher than the control. This study indicates the feasibility of metal oxide mediated extracellular NADPH regeneration of Synechocystis to increase the production of ethanol.

show abstract

Ferrous iron oxidation by molecular oxygen under acidic conditions: The effect of citrate, EDTA and fulvic acid

Cited by 113 publications

References 54 publications

Impact of Organics and Carbonates on the Oxidation and Precipitation of Iron during Hydraulic Fracturing of Shale

Impact of Organics and Carbonates on the Oxidation and Precipitation of Iron during Hydraulic Fracturing of Shale

Electrochemical characterization of natural organic matter by direct voltammetry in an aprotic solvent

Metal Oxide Mediated Extracellular NADPH Regeneration Improves Ethanol Production by Engineered Synechocystis sp. PCC 6803

Contact Info

Product

Resources

About