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

Chen, Zhaoyang; Fan, Bin; Peng, Xianjia; Zhang, Zhongguo; Fan, Jinghua; Zhang, Luan

doi:10.1016/j.chemosphere.2006.01.038

Cited by 96 publications

(99 citation statements)

References 12 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).…”

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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“…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).…”

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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“…Then the turbidity of synthetic water was adjusted to about 2 NTU with a very small amount of kaolin stock suspension prepared according to Chen et al (2006a). The kaolin particles in synthetic water were used as nucleating agent, and were helpful to eliminate the uncertainty and randomness during coagulants' nucleation process, which thereby enhanced the reproducibility of experimental results.…”

Section: Methodsmentioning

confidence: 99%

“…Our recent research results indicated that Al 30 species was more effective for turbidity removal than Al 13 species. Compared with Al 13 species, Al 30 achieved effective turbidity removal within a broad dosage range and a wide pH range (Chen et al, 2006a). However, the detailed coagulation mechanism of Al 30 species is unclear.…”

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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“…These results indicated that coagulant type and pH significantly affected fluoride removal performance and PACl 1 and PACl 2 removed fluoride more efficiently than AlCl 3 did, especially under acidic pH and alkaline pH conditions. Chen et al reported that Al 13 showed high positive charge, stable structure, and strong binding affinity, and is the most active Al species in Al salts responsible for coagulation process [25]. In addition, Al 13 also contributed most to the amount of Al species for PACl in basicity range from 1.5 to 2.5 [26,27].…”

Section: Removal Efficiency Of Fluoride By Different Al Coagulantsmentioning

confidence: 99%

Coagulation behaviors of aluminum salts towards fluoride: Significance of aluminum speciation and transformation

Lan

Gong

et al. 2016

Separation and Purification Technology

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a b s t r a c tThis study investigates the effects of aluminum (Al) and F interactions on the coagulation behaviors of Al salts, i.e., AlCl 3 and polymer aluminum chloride (PACl) at different basicity (B) towards fluoride. These coagulants achieve the optimum fluoride removal over pH 6-7, and PACl exhibits higher removal efficiency than AlCl 3 does over pH 4-9. The removal of fluoride is positively correlated with the content of either Al 13 or Al b in Al-based coagulants over pH 4-9 and increases in the order: PACl 2 > PACl 1 > AlCl 3 . As for PACl, the increased B from 0 to 2.4 improves fluoride removal owing to the elevated ratios of Al b . However, at further increased B to 2.8, the formation of colloidal Al species

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

Cited by 96 publications

References 12 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

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

Coagulation behaviors of aluminum salts towards fluoride: Significance of aluminum speciation and transformation

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