Uptake of aqueous heavy metal ions (Co2+, Cu2+ and Zn2+) by calcium-aluminium-silicate-hydrate gels

Baldermann, Andre; Preissegger, Veronika; Simic, Sanja; Letofsky-Papst, Ilse; Mittermayr, Florian; Dietzel, Martin

doi:10.1016/j.cemconres.2021.106521

Cited by 50 publications

(10 citation statements)

References 83 publications

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“…Figure 6 shows the HAADF images and EDS mappings of various C–S–H samples. Notably, the pure C–S–H has a disordered and wrinkled foil‐like structure, coinciding with previous studies 57–59 . Nevertheless, PCA and SR‐PCA promote the foil‐like structure to transform into a thinner and more finely crumpled foil structure, in which SR‐PCA has a milder effect.…”

Section: Resultssupporting

confidence: 89%

“…Notably, the pure C-S-H has a disordered and wrinkled foil-like structure, coinciding with previous studies. [57][58][59] Nevertheless, PCA and SR-PCA promote the foil-like structure to transform into a thinner and more finely crumpled foil structure, in which SR-PCA has a milder effect. Generally, the formation of C-S-H involves conversion from a globular precursor to the final foil-like product.…”

Section: Temmentioning

confidence: 99%

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Influence of novel shrinkage‐reducing polycarboxylate superplasticizer on the nature of calcium–silicate–hydrates

Liu

Huang

et al. 2022

J Am Ceram Soc.

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Currently, a novel shrinkage-reducing polycarboxylate superplasticizer (SR-PCA) is used to control cementitious shrinkage. To clarify its mechanism when applied in cementitious materials, the influence of SR-PCA on the composition, morphology, and structure of synthetic calcium-silicate-hydrate (C-S-H), together with the interaction between SR-PCA and C-S-H at the atomic level, is investigated. For comparison, a commercial polycarboxylate superplasticizer (PCA) is also employed. The results show PCA and SR-PCA can adsorb on the C-S-H surface rather than intercalate into the layers. Compared with PCA, SR-PCA has a milder impact on C-S-H crystallinity. SR-PCA refines the pore structure of C-S-H drastically, whereas PCA loosens the structure by increasing the mesopore volume. In addition, the adsorption effect of SR-PCA on the C-S-H surface is less significant than that of PCA. At the atomic level, this less adsorption of SR-PCA is attributed to the lower adhesion energy of the C-S-H/SR-PCA interface due to the weaker Ca-O bond strength.

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Section: Resultssupporting

confidence: 89%

Section: Temmentioning

confidence: 99%

Influence of novel shrinkage‐reducing polycarboxylate superplasticizer on the nature of calcium–silicate–hydrates

Liu

Huang

et al. 2022

J Am Ceram Soc.

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“…The main problem that is associated with the synthetic dyes are their consecutive rate loss during the manufacturing process when used by industries at large scale that further be unconfined into various waterways such as rivers and lakes without their treatment (Periyasamy and Militky, 2020). On the other hand, the removal of heavy metal ions such as Pb (II), Cd (II), Co (II), Zn (II) and Uranium (VI) have also seized a lot of consideration and stroked the thrust from various scientists and researchers due to their proposed treatment methods (Kolodynska et al, 2017;Baldermann et al, 2021;Kameda et al, 2008;Zeng et al, 2022). The nuclear energy plays a vital role in progress of any country's economy.…”

Section: Microwave Assisted Irradiationmentioning

confidence: 99%

Synergistic effect of bio-inspired Psyllium/Okra hybrid backbone based hydrogel using RSM optimization for efficient removal of toxic malachite green dye and sequestration of uranium (VI) ions from water

Singh

Kaith

Mehra

et al. 2022

Preprint

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The objective of the present work is to fabricate environment-friendly biosorbent semi-Interpenetrating Network Device based on Psyllium-Okra hybrid backbone and acrylamide by using citric acid and ammonium persulphate as the crosslinker and initiator respectively. Response Surface Methodology (RSM) was used for the optimization of different reaction parameters that sequentially maximized the percentage swelling of the fabricated gel. Amalgamation of acrylamide chains onto Psyllium-Okra based hybrid backbone functional groups present and crosslinking between the different polymeric chains were further confirmed through techniques like FTIR, SEM-EDX and PXRD. The sample showed better thermal stability with decomposition of different phases at higher temperatures. The synthesized semi-IPN was successfully proved to be the proficient candidate for the removal of cationic toxic malachite green dye (62.38 %) with an adsorbent dose of 1.0 g, initial concentration of 10 mg L-1 and time interval of five minute at ambient temperature. Langmuir and Freundlich adsorption isotherm models were studied in order to determine the nature of adsorption took place and it was analysed that Langmuir adsorption isotherm was the best fit model for the removal of toxic cationic malachite green dye. Kinetic studies for the sorption of dyes favoured the reaction mechanism to occur via a pseudo second order pathway with R2 value about 0.99. The synthesized semi-IPN was also utilized in uranium (VI) uptake with an adsorbent dose of 1.0 g, initial concentration of 100 ppb, time interval of 55 minutes at room temperature. The semi-IPN could uptake 97.10 ppb uranium (VI) and was observed highly efficient in uranium (VI) ions removal from aqueous medium. Thus, adsorption studies indicated that semi-IPN prepared out of natural blend was found effective in the sequestration of toxic dyes and heavy metal ions.

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“…42 For example, Baldermann and colleagues reported the uptake mechanism and immobilization capacity of calcium-aluminum-silicate-hydrate (C-A-S-H) gels towards heavy metal ions, and found the removal efficiency of Cu 2+ and Co 2+ by C-A-S-H to be 99.994%. 43 Li and colleagues reported on Fe-based C-S-H using steel-slag Ca and Fe sources through a one-step alkaline activation process to remove As( v ). 44 However, few studies have focused on the removal of Cr(T) due to the extremely weak adsorption of C-S-H toward Cr( vi ).…”

Section: Introductionmentioning

confidence: 99%

Removal of total chromium in wastewater via simultaneous photocatalysis and adsorption using calcium silicate hydrate-based composites

Liu,

Jin

et al. 2023

J. Mater. Chem. A

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Uptake of aqueous heavy metal ions (Co2+, Cu2+ and Zn2+) by calcium-aluminium-silicate-hydrate gels

Cited by 50 publications

References 83 publications

Influence of novel shrinkage‐reducing polycarboxylate superplasticizer on the nature of calcium–silicate–hydrates

Influence of novel shrinkage‐reducing polycarboxylate superplasticizer on the nature of calcium–silicate–hydrates

Synergistic effect of bio-inspired Psyllium/Okra hybrid backbone based hydrogel using RSM optimization for efficient removal of toxic malachite green dye and sequestration of uranium (VI) ions from water

Removal of total chromium in wastewater via simultaneous photocatalysis and adsorption using calcium silicate hydrate-based composites

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