Association of dissolved aluminum with silica: Connecting molecular structure to surface reactivity using NMR

Houston, Jacqueline R.; Herberg, Julie L.; Maxwell, Robert S.; Carroll, Susan A.

doi:10.1016/j.gca.2008.04.028

Cited by 41 publications

(54 citation statements)

References 39 publications

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“…2). This decrease in the Si effluent concentration is consistent with the results of Houston et al (2008) indicating the precipitation of an aluminosilicate phase. The pH, Al, and Si concentrations remain relatively constant throughout the remainder of the experiments and indicate that steady-state reaction conditions have been achieved.…”

Section: Thermodynamic Landscapesupporting

confidence: 90%

“…3c). The NMR results presented here align with those presented by Houston et al (2008) where Al [4] peaks dominate in uptake samples produced over a wide range of pH conditions, but are in stark contrast to the predictions of the solution chemistry.…”

Section: Al Coordination Environment In the Precipitatessupporting

confidence: 87%

“…The pH, Al, and Si concentrations remain relatively constant throughout the remainder of the experiments and indicate that steady-state reaction conditions have been achieved. The low degree of scatter present in these data also indicates that there is no significant contribution to the solution chemistry from the presence of colloidal particles which are also consistent with the results of Houston et al (2008).…”

Section: Thermodynamic Landscapesupporting

confidence: 86%

“…Al [4] containing aluminosilicate phases have been identified as the dominant phases in hydrothermal scales (Gallup, 1997;Nishida et al, 2009) siliceous hot spring deposits (Yokoyama et al, 2004), biogenic silica (Gehlen et al, 2002), and inorganic opals (Brown et al, 2003;Paris et al, 2007). Houston et al (2008) indicated that metastable Al [4] dominant aluminosilicate phases form during uptake experiments performed at pH >5 and higher dissolved silica concentrations despite thermodynamic forces driving the formation of kaolinite.…”

Section: Introductionmentioning

confidence: 99%

“…Advanced techniques which exploit the couplings between neighboring elements can provide more detailed structural determination of these Al containing phases. 27 Al{ 1 H} cross-polarization (CP) experiments have also been applied with some success to identify the hydration state of Al in uptake experiments, but results can often be inconclusive (Stone et al, 1993;Houston et al, 2008). Rotational echo double resonance (REDOR) techniques can be used to exploit these couplings between 1 H and neighboring nuclei, and have been used successfully to differentiate between different acidic sites in framework aluminosilicates (Blumenfeld et al, 1995;Blumenfeld and Fripiat, 1997).…”

Section: Introductionmentioning

confidence: 99%

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The formation of metastable aluminosilicates in the Al–Si–H2O system: Results from solution chemistry and solid-state NMR spectroscopy

Mason

Maxwell

Carroll

2011

Geochimica et Cosmochimica Acta

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We present the results of a series of experiments designed to probe the interactions between Al and the amorphous silica surface as a function of thermodynamic driving forces. The results from 27 Al single pulse magic angle spinning (SP/MAS) and 27 Al{ 1 H} rotational echo double resonance (REDOR) allow us to identify the reaction products and constrain their structure. In all cases, despite low Al and Si concentrations we observe the formation of metastable aluminosilicates. Results from low temperature experiments indicate that despite thermodynamic driving forces for the formation of gibbsite we observe the precipitation of separate octahedrally coordinated Al (Al [6] ) and tetrahedrally coordinated Al (Al [4] ) silicate phases. At higher temperatures the Al [4] silicate phase dominates the speciation. Structural models derived from the NMR data are also proposed, and the results are discussed as they relate to previous work on Al/Si cycling. Published by Elsevier Ltd.

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Section: Thermodynamic Landscapesupporting

confidence: 90%

Section: Al Coordination Environment In the Precipitatessupporting

confidence: 87%

Section: Thermodynamic Landscapesupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The formation of metastable aluminosilicates in the Al–Si–H2O system: Results from solution chemistry and solid-state NMR spectroscopy

Mason

Maxwell

Carroll

2011

Geochimica et Cosmochimica Acta

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References

2010

Surface Complexation Modeling

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Bacterial Adhesion to Metal Oxide‐Coated Surfaces in the Presence of Silicic Acid

Park

Kim²

2011

Water Environment Research

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This study investigated the effect of silicic acid to the adhesion of Bacillus subtilis to metal oxide‐coated surfaces. The first sets of column experiments were conducted under various concentrations of silicic acid. The second and third experiments were performed under various concentrations of sulfate and nitrate to compare the results from silicic acid. Bacterial breakthrough curves were obtained by monitoring effluent, and mass recoveries were quantified from these curves. The results show that, at silicic acid concentrations between 0 and 0.2 mM, bacteria were negatively charged, while the charges of metal oxides were changed from positive to negative. Bacterial adhesion to metal oxide‐coated surfaces decreased sharply with increasing silicic acid concentration (bacterial mass recovery increased from 11.5 to 82.2%), as a result of the hindrance effect of silicic acid adsorbed onto metal oxide‐coated surfaces. Between 0.2 and 10 mM, both bacteria and metal oxides were negatively charged. Bacterial adhesion remained constant (mass recovery were 80.5 to 82.2%), despite the increasing silicic acid concentration, possibly as a result of the hindrance effect of polymerized silicic acid. That is, the bacterial approach to the metal oxide‐coated surfaces could be disturbed through steric hindrance of polymerized silicic acid, which compensates the potential enhancement effect from the electrical double layer compression. The results also illustrate that the effect of silicic acid on bacterial adhesion was greater than those of sulfate and nitrate. This study demonstrates that silicic acid can play a significant role in bacterial interaction with metal oxide‐coated surfaces.

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Association of dissolved aluminum with silica: Connecting molecular structure to surface reactivity using NMR

Cited by 41 publications

References 39 publications

The formation of metastable aluminosilicates in the Al–Si–H2O system: Results from solution chemistry and solid-state NMR spectroscopy

The formation of metastable aluminosilicates in the Al–Si–H2O system: Results from solution chemistry and solid-state NMR spectroscopy

References

Bacterial Adhesion to Metal Oxide‐Coated Surfaces in the Presence of Silicic Acid

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