Effect of aging condition on species transformation in polymeric Al salt coagulants

Feng, Chenghong; Ge, Xiaopeng; Wang, Dongsheng; Tang, Hongxiao

doi:10.1016/j.colsurfa.2010.11.046

Cited by 10 publications

(4 citation statements)

References 31 publications

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“…ESI-MS here is used to establish the behavior and dispersal of various forms of Al species in IPC variants, which helps to comprehend the speciation reactions for Al . [Al x O y (OH) z (H 2 O) m ] (2 y + z −3 x )+ is used as the general formula for the assignment of all species. , The ideal form of Al occurrence in monomeric, oligomeric, and high polymeric species with charges +1, +2, and +3 can be represented as Al x O ( x –1) (OH) ( x +1) + , Al x O ( x –1) (OH) x 2+ , and Al x O ( x –1) (OH) ( x −1) 3+ , respectively. The spectra of the synthesized IPCs (IPC-M and IPC-UH) are shown in Figure A,B.…”

Section: Resultsmentioning

confidence: 99%

“…41 [Al x O y (OH) z (H 2 O) m ] (2y+z−3x)+ is used as the general formula for the assignment of all species. 42,43 The ideal form of Al occurrence in monomeric, oligomeric, and high polymeric species with charges +1, +2, and +3 can be represented as Al 4 lists the molecular formulas and m/z of monomeric, oligomeric, and high polymeric species in the IPC samples (IPC-UH, M). The monomers, oligomers, and high polymers at m/z values (100, 103, 158,175, 203, 223, 237, 249, and 400) are attributed to their higher peak intensity in Figure 3 A,B.…”

Section: Resultsmentioning

confidence: 99%

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Investigation of Plausible Mechanism of the Synthesized Inorganic Polymeric Coagulant and Its Application toward Fluoride Removal from Drinking Water

Solanki

Agarwal

Maheshwari

et al. 2020

Ind. Eng. Chem. Res.

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Fluoride, an anionic pollutant, existing in concentrations exceeding the allowed limit of 1.5 mg/L in drinking water, has been reported to cause detrimental impact on human health. The traditionally employed methods for water defluoridation mostly involve Al-based coagulants, which however face some limitations, such as requirement of relatively high dosage and production of excessive amounts of chemical sludge posing a problem of its safe disposal. In this study, two inorganic polymeric coagulants of medium (IPC-M) and ultrahigh basicity (IPC-UH) were synthesized using polymerization of aluminum trihydrate (Al 2 O 3 •3H 2 O) with an aqueous solution of 32% hydrochloric acid. The basicity of coagulants was increased by manipulating the redox reaction of the product with the aluminum metal. The synthetic coagulants were analyzed using various characterization techniques, viz., Fourier transform infrared spectroscopy, electrospray ionization−mass spectrometry, and field emission scanning electron microscopy with electron-dispersive X-ray spectroscopy, and the main physicochemical properties such as % Al 2 O 3 , relative basicity, and % chloride. The aluminum species distribution was assessed by the ferron assay, and their electrochemical properties such as dissolved charge, conductivity, acidity, and pH were also measured. The application of IPCs was explored for their fluoride removal efficacy using jar tests. The outcome showed that IPC-M was the most efficient when applied in a pH range relevant to fluoride-containing water as it was the only coagulant that showed increasing efficiency at pH values > 7. The uptake capacity of coagulants for using synthetic samples prepared in Milli-Q water containing 9 mg/L of raw fluoride concentrations to achieve residual concentration of less than 1.5 mg F/L at the pH value 6.5 ± 0.1 was calculated as 87.68 and 68.48 mg F/g Al 2 O 3 for IPC-M and IPC-UH, respectively, which were higher than the reported values of 37.42 and 37.75 mg F/g Al 2 O 3 for alum and polyaluminum chloride in an earlier published paper. The residual aluminum concentration in these experiments ranged at 30 ± 5 and 20 ± 5 μg Al/L, respectively, for IPL-M and IPL-UH, which were well within the WHO norm for drinking water (<200 μg/L), indicating their immense application in the field.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Investigation of Plausible Mechanism of the Synthesized Inorganic Polymeric Coagulant and Its Application toward Fluoride Removal from Drinking Water

Solanki

Agarwal

Maheshwari

et al. 2020

Ind. Eng. Chem. Res.

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“…Materials. Al 13 is a hydroxy-Al polymer with a hydrated radius of 9.5 Å, whose content in PHA solutions depends on the total Al concentration, degree of basification (OH/Al molar ratio), reaction temperature, alkali injection rate, ageing time and temperature 19,[27][28][29][30] . The PHA solution can be obtained by the alkali neutralization titration method 31 .…”

Section: Methodsmentioning

confidence: 99%

Experimental study on the engineering properties of expansive soil treated with Al13

She

Ya-hui

et al. 2020

Sci Rep

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this paper investigates the stabilization of expansive soil with hydroxy-aluminium (Al 13) with Al/soil ratios of 0.10, 0.14, 0.18, 0.22 and 0.26 mmol/g. A series of laboratory tests were conducted to study the effects of Al 13 on the mechanical properties of expansive soil, including Atterberg limits, grain size distribution, swell percent, swell pressure and unconsolidated-undrained (UU) triaxial strength. the results revealed that Al 13 reduced the plasticity index, clay content and swelling potential and enhanced the shear strength of expansive soil. The minerals and micro-structural changes in the soil samples were also determined by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the stabilized soil showed a remarkable flocculated-agglomerated structure characterized by the densification of particle associations. The consistency of the changes in mechanical properties and micro-morphology indicated that expansive soil can be effectively improved with the use of Al 13. Additionally, the optimum dosage of polynuclear hydroxy-Al (PHA) solution for stabilizing expansive soil was 0.18 mmol/g under the given properties of expansive soil and PHA utilized in this study.

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“…For a long time, researchers believed that [AlO 4 Al1 2 (OH) 24 (H 2 O) 12 ] 7+ (abbreviated as Al 13 ) as the representative aggregation form plays a critical role in flocculation performance. Studies on the generation, morphological identification 4 and flocculation performance 5 of Al 13 are numerous and long-lasting.…”

Section: Introductionmentioning

confidence: 99%

Flocculation Performance and Shearing Capacity Study on Al30 Morphology in Polyhydroxy Aluminium

Jiang¹,

Feng²,

Li³

et al. 2013

Asian J. Chem.

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As a newly discovered polyaluminum morphology after Al13, Al30 is the highest charge cation of polyhydroxy aluminum so far. By comparative analyzing synthetic Al30, Al13 and commercial polyaluminum chloride, test results show that Al30 has optimal coagulation effect by contrasting turbidity, UV254 removal efficiencies and electric neutralization capacity. The particle size analysis of flocculated kaolin micro particles shows that the three flocculants can combine with kaolin particles below 10 µm. The floc size in Al30 is the largest, followed by Al13 and then polyaluminum chloride, which further proved the advantage of Al30 in flocculation process. The conventional jar test and the monitoring technique of floc size online are employed to investigate the shearing capacity of the flocs formed by Al30. It is found that remixing can make the broken flocs fully recovered and the particle size of recovered flocs are greatly increased, especially in Al30.

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Effect of aging condition on species transformation in polymeric Al salt coagulants

Cited by 10 publications

References 31 publications

Investigation of Plausible Mechanism of the Synthesized Inorganic Polymeric Coagulant and Its Application toward Fluoride Removal from Drinking Water

Investigation of Plausible Mechanism of the Synthesized Inorganic Polymeric Coagulant and Its Application toward Fluoride Removal from Drinking Water

Experimental study on the engineering properties of expansive soil treated with Al13

Flocculation Performance and Shearing Capacity Study on Al30 Morphology in Polyhydroxy Aluminium

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