Effect of total aluminum concentration on the formation and transformation of nanosized Al13 and Al30 in hydrolytic polymeric aluminum aqueous solutions

Chen, Guihai; Zhaoyang,; Liu, Ming; Changjun,; Luan,; Zhaokun,; Zhang, Zhongguo; Li, Qing; Yanzhong,; Jia, Jia; Zhiping,

doi:10.1360/982005-67

Cited by 18 publications

(12 citation statements)

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“…And the formation of Al 30 is accelerated by the increase of total Al concentration (Chen et al, 2005). The formation conditions of Al 30 coincide with the production conditions of commercial polyaluminum coagulant, in which polyaluminum coagulant has a high total Al concentration and is prepared at high temperature for a long time.…”

Section: Introductionmentioning

confidence: 56%

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

et al. 2006

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Section: Introductionmentioning

confidence: 56%

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

et al. 2006

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“…To date, much less was concerned on the formation and transformation of Al 30 species in highly concentrated HPA solutions (0.2-2.0 mol L −1 ). Our research results indicate that the conversion of Al 13 to Al 30 was accelerated by the increase in Al T [29]. The effect of temperature on Al speciation in HPA solutions had been intensively studied before the identification of Al 30 [30][31][32][33].…”

Section: Introductionmentioning

confidence: 76%

Effect of thermal treatment on the formation and transformation of Keggin Al13 and Al30 species in hydrolytic polymeric aluminum solutions

Chen

Luan

Fan

et al. 2007

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Al 30 species was more thermal resistant and more stable in low pH solution than Al 13 species (Chen, 2006;Chen et al, 2007). It became a dominant polymeric Al species in highly concentrated polyaluminum solutions (Shafran et al, 2005b;Chen et al, 2005). Our recent research results indicated that Al 30 species was more effective for turbidity removal than Al 13 species.…”

Section: Introductionmentioning

confidence: 92%

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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Effect of total aluminum concentration on the formation and transformation of nanosized Al13 and Al30 in hydrolytic polymeric aluminum aqueous solutions

Cited by 18 publications

References 0 publications

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

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

Effect of thermal treatment on the formation and transformation of Keggin Al13 and Al30 species in hydrolytic polymeric aluminum solutions

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

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