Al30: A Giant Aluminum Polycation

Allouche, Lionel; Gérardin, Corine; Loiseau, Thierry; Férey, Gérard; Taulèlle, Francis

doi:10.1002/(sici)1521-3773(20000204)39:3<511::aid-anie511>3.0.co;2-n

Cited by 219 publications

(231 citation statements)

References 19 publications

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“…Dissolved (Chen et al, 2006). Al 30 has unique nanometer molecule dimension (2.0 nm in length) and eighteen positive charges (Allouche et al, 2000). However in Al 13 system, the large amount of deposited aluminum might be partly resulted from the gradual aggregation of dissolved Al 13 species.…”

Section: Aluminum Speciation Variation In Coil-pipe Testmentioning

confidence: 99%

Deposition behavior of residual aluminum in drinking water distribution system: Effect of aluminum speciation

Zhang

Shi

Zhao

et al. 2016

Journal of Environmental Sciences

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Section: Aluminum Speciation Variation In Coil-pipe Testmentioning

confidence: 99%

Deposition behavior of residual aluminum in drinking water distribution system: Effect of aluminum speciation

Zhang

Shi

Zhao

et al. 2016

Journal of Environmental Sciences

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“…Al (Allouche et al, 2000;Rowsell and Nazar, 2000). Al 30 is more temperature resistant and less sensitive to pH variations than e-Al 13 (Allouche et al, 2000).…”

Section: Introductionmentioning

confidence: 98%

“…Al 30 is more temperature resistant and less sensitive to pH variations than e-Al 13 (Allouche et al, 2000). Al 30 possesses eighteen positive charges and unique nanometer molecule dimension (2.0 nm in length) (Allouche et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Al30 polynuclear species in polyaluminum solutions as coagulant for water treatment

et al. 2006

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“…So it has received the most attention (Bi et al, 2004;Gao et al, 2005 27 Al nuclear magnetic resonance (NMR) spectra about twenty years ago (Akitt and Farthing, 1981;Fu and Nazar, 1991). But its structure and stoichiometry were not determined, until 2000 it was characterized by Allouche et al (2000) and Rowsell and Nazar (2000) using X-ray diffraction and in situ 27 Al NMR. Al 30 , with 2 nm in length (Phillips et al, 2003), was the largest Al polycation that was identified in polyaluminum solution.…”

Section: Introductionmentioning

confidence: 99%

Study on the hydrolysis/precipitation behavior of Keggin Al13 and Al30 polymers in polyaluminum solutions

Chen

Luan

Jia

et al. 2009

Journal of Environmental Management

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a b s t r a c tThe hydrolysis/precipitation behaviors of Al 3þ , Al 13 and Al 30 under conditions typical for flocculation in water treatment were investigated by studying the particulates' size development, charge characteristics, chemical species and speciation transformation of coagulant hydrolysis precipitates. The optimal pH conditions for hydrolysis precipitates formation for AlCl 3 , PAC Al13 and PAC Al30 were 6.5-7.5, 8.5-9.5, and 7.5-9.5, respectively. The precipitates' formation rate increased with the increase in dosage, and the relative rates were AlCl 3 [ PAC Al30 > PAC Al13 . The precipitates' size increased when the dosage increased from 50 mM to 200 mM, but it decreased when the dosage increased to 800 mM. The Zeta potential of coagulant hydrolysis precipitates decreased with the increase in pH for the three coagulants. The isoelectric points of the freshly formed precipitates for AlCl 3 , PAC Al13 and PAC Al30 were 7.3, 9.6 and 9.2, respectively. The Zeta potentials of AlCl 3 hydrolysis precipitates were lower than those of PAC Al13 and PAC Al30 when pH > 5.0. The Zeta potential of PAC Al30 hydrolysis precipitates was higher than that of PAC Al13 at the acidic side, but lower at the alkaline side. The dosage had no obvious effect on the Zeta potential of hydrolysis precipitates under fixed pH conditions. The increase in Zeta potential with the increase in dosage under uncontrolled pH conditions was due to the pH depression caused by coagulant addition. Al-Ferron research indicated that the hydrolysis precipitates of AlCl 3 were composed of amorphous Al(OH) 3 precipitates, but those of PAC Al13 and PAC Al30 were composed of aggregates of Al 13 and Al 30 , respectively. Al 3þ was the most un-stable species in coagulants, and its hydrolysis was remarkably influenced by solution pH. Al 13 and Al 30 species were very stable, and solution pH and aging had little effect on the chemical species of their hydrolysis products. The research method involving coagulant hydrolysis precipitates based on Al-Ferron reaction kinetics was studied in detail. The Al species classification based on complex reaction kinetic of hydrolysis precipitates and Ferron reagent was different from that measured in a conventional coagulant assay using the Al-Ferron method. The chemical composition of Al a , Al b and Al c depended on coagulant and solution pH. The Al b measured in the current case was different from Keggin Al 13 , and the high Al b content in the AlCl 3 hydrolysis precipitates could not used as testimony that most of the Al 3þ was converted to highly charged Al 13 species during AlCl 3 coagulation.

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Al30: A Giant Aluminum Polycation

Cited by 219 publications

References 19 publications

Deposition behavior of residual aluminum in drinking water distribution system: Effect of aluminum speciation

Deposition behavior of residual aluminum in drinking water distribution system: Effect of aluminum speciation

Evaluation of Al30 polynuclear species in polyaluminum solutions as coagulant for water treatment

Study on the hydrolysis/precipitation behavior of Keggin Al13 and Al30 polymers in polyaluminum solutions

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