Interaction between Al3+ and Acrylic Acid and Polyacrylic Acid in Acidic Aqueous Solution: A Model Experiment for the Behavior of Al3+ in Acidified Soil Solution

Etou, Mayumi; Masaki, Yuka; Tsuji, Yutaka; Saito, Tomoyuki; Bai, Shuqin; Nishida, Ikuko; Okaue, Yoshihiro; Yokoyama, T.

doi:10.2116/analsci.27.111

Cited by 11 publications

(10 citation statements)

References 15 publications

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“…e results at pH 3 were in agreement with our previous research (Etou et al, 2011). e 27 Al MAS NMR spectra are shown in Figure 3.…”

Section: Characterization Of the Insoluble Al-paa Complexsupporting

confidence: 92%

“…e molar ratios of COOH and Al in the precipitate (COOH/Al), referred to as Rp, are listed in Table 2. At R= 1, the Rp value at pH 3 was close to 3, indicating that an Al 3+ was bonded to three COOH groups on average, a result in agreement with the literature studies (Etou et al, 2011). At pH 4.5-8 instead, under the same R, Rp was close to 1.…”

Section: Chemical Composition Of Precipitates At Various Ph Levelssupporting

confidence: 90%

“…e Rp value of 2.54 (Table 2) suggests that the Al 3+ was coordinated to multiple COOH groups of multiple PAA molecules. As the formation of an intermolecular soluble Al-PAA complex at pH 3 has been reported (Etou et al, 2011), we consider that the same interaction mode may occur in our experiment during the precipitation.…”

Section: Characterization Of the Insoluble Al-paa Complexsupporting

confidence: 83%

“…e 27 Al NMR spectra of the mixed solutions of Al 3+ and PAA at pH 3 were discussed in detail in a previous study (Etou et al, 2011). erefore, in this study, our discussion will focus on the results for sample solutions at pH values above 3. e 27 Al NMR spectra allowed us to investigate the chemical state of Al 3+ in mixed solutions; those of the mixed solutions of Al 3+ and PAA (R= 50) at various pH levels are shown in Figure 1.…”

Section: Precipitation Behaviormentioning

confidence: 95%

“…However, our previous study revealed that PAA strongly a ects the Al 3+ hydrolysis behavior in aqueous solution above pH 3. Etou et al (2011) found that PAA binds more strongly than monomeric acrylic acid to Al 3+ through intramolecular and intermolecular interactions at pH 3, as the hydrolysis of Al 3+ does not occur under this pH condition (Etou et al, 2011). Furthermore, PAA is also widely known as a calcium carbonate scale inhibitor in heat exchange processes and water treatment processes, and so on (Tang et al, 2008;Li et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Interaction between Al<sup>3+</sup> and Poly(acrylic acid) (PAA) in Aqueous Solution—Formation Modes for the Al–PAA Complexes

Etou

Yonezu

Inoue

et al. 2022

J. Chem. Eng. Japan

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The interaction between Al 3 and poly(acrylic acid) (PAA) which is a polyelectrolyte was investigated under various conditions. It was revealed that PAA has a strong binding ability with Al 3 not only in liquid phase but also in solid phase. Even when no hydrolysis of Al 3 occur at pH 3, the Al 3 was deposited together with PAA under various COOH/Al ratios and formed an insoluble Al-PAA complex. It was found that the hydrolysis of Al 3 was strongly retarded due to the complexation with PAA even under neutral and alkaline conditions. An excess amount of PAA in mixed solution retarded the precipitation of Al 3 at pH 4.5-8. The soluble Al-PAA complex suppressed the formation of the Al 13 polycation in solution. Moreover, an insoluble Al-PAA complex was also formed under COOH/Al ratio of 1. The molar ratio of COOH/Al in precipitates was dependent on the pH of the reaction solution. The type of chemical bond involved in the Al-PAA complex was a ected by the Al 3 hydrolysis and dissociation of H from the carboxyl groups in PAA. At pH 3, one Al 3 combined with three carboxyl groups by substitution reaction with H . Above pH 3, one Al(OH) 2 or one Al(OH) 2 combined ionically with two or one COO groups, respectively. The results of this study can be potentially applied to formulate a method to remove Al 3 from various wastewater environments in a wide pH range.

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“…e results at pH 3 were in agreement with our previous research (Etou et al, 2011). e 27 Al MAS NMR spectra are shown in Figure 3.…”

Section: Characterization Of the Insoluble Al-paa Complexsupporting

confidence: 92%

Section: Chemical Composition Of Precipitates At Various Ph Levelssupporting

confidence: 90%

Section: Characterization Of the Insoluble Al-paa Complexsupporting

confidence: 83%

Section: Precipitation Behaviormentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Interaction between Al<sup>3+</sup> and Poly(acrylic acid) (PAA) in Aqueous Solution—Formation Modes for the Al–PAA Complexes

Etou

Yonezu

Inoue

et al. 2022

J. Chem. Eng. Japan

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Speciation and equilibria in the H+–Al3+ - polyacrylic acid system

Lützenkirchen

Sjöberg

2017

Monatsh Chem

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Complexation Between Aluminum Ion and Glycolic Acid Under Acidic Condition

et al. 2023

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The complexation between Al 3+ ([Al(H 2 O) 6 ] 3+ ) and glycolic acid (GA, C 2 H 4 O 3 ) which has a carboxyl group and a hydroxyl group in a molecule was investigated under acidic condition using 27 Al NMR, 13 C NMR and ESI-MS techniques. The ve peaks including a peak due to Al 3+ were observed in 27 Al NMR spectra for the mixed solution of Al 3+ and GA, suggesting the existence of at least four Al-GA complexes. The results of NMR and ESI-MS measurements revealed that GA and Al 3+ can form one monodentate complex (AlGA 2+ ) and three bidentate complexes (AlGA + , AlGA 2 − , and AlGA 3 3− ) complexes. From the deconvolution of 27 Al NMR spectra and pKa value of GA, the conditional formation constants (log K) of each complex (GA/Al molar ratio of 25 in mixed solution) can be determined to be 0.94 (AlGA 2+ ), -0.96 (AlGA + ), -0.77 (AlGA 2 -) and − 2.21 (AlGA 3 3-), respectively. In addition, the overall formation constant of three bidentate complex at pH 3 was also calculated to be -1.65.

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Interaction between Al3+ and Acrylic Acid and Polyacrylic Acid in Acidic Aqueous Solution: A Model Experiment for the Behavior of Al3+ in Acidified Soil Solution

Cited by 11 publications

References 15 publications

Interaction between Al<sup>3+</sup> and Poly(acrylic acid) (PAA) in Aqueous Solution—Formation Modes for the Al–PAA Complexes

Interaction between Al<sup>3+</sup> and Poly(acrylic acid) (PAA) in Aqueous Solution—Formation Modes for the Al–PAA Complexes

Speciation and equilibria in the H+–Al3+ - polyacrylic acid system

Complexation Between Aluminum Ion and Glycolic Acid Under Acidic Condition

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