Fabrication, microstructure, and hydration of nano β-Ca2SiO4 powder by co-precipitation method

Su, Zhuangfei; Li, Li; Liu, Ze; Huang, Chunlong; Wang, Dongmin; Wang, Tianyi

doi:10.1016/j.conbuildmat.2021.123737

Cited by 9 publications

(4 citation statements)

References 42 publications

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“…The second weight loss of 13.69% from 120°C to 400°C was attributed to the removal of chemisorbed water. The third weight loss of 28.79% from 400°C to 600°C stemmed from thermal decomposition of calcium hydroxide (Ca(OH) 2 → CaO + H 2 O) 41 . The fourth weight loss of 45.36% from 600°C to 700°C emanated from thermal decomposition of calcium carbonate.…”

Section: Resultsmentioning

confidence: 99%

“…The morphology of the synthesized composite was observed by SEM and TEM. In Figure 4a,b, the SEM image of the α-MnO 2 /β-C 2 S nanocomposite shows a typical nanorod structure of α-MnO 2 which is covered by sheet-like structure of β-C 2 S. 40,41 Figure 4c-g displays the SEM energy-dispersive X-ray spectroscopy mapping of the α-MnO 2 /β-C 2 S nanocomposite, which clearly shows the uniform elemental distribution of Mn, O, Ca, and Si in the composite. Also, the elemental percentages of Mn, O, C, and Si in the α-MnO 2 /β-C 2 S nanocomposite are 12.4, 51.2, 25.3, and 10.9, respectively.…”

Section: Characterization Of the Adsorbentmentioning

confidence: 99%

“…The third weight loss of 28.79% from 400 • C to 600 • C stemmed from thermal decomposition of calcium hydroxide (Ca(OH) 2 → CaO + H 2 O). 41 The fourth weight loss of 45.…”

Section: Characterization Of the Adsorbentmentioning

confidence: 99%

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Synthesis of α‐MnO₂, β‐C₂S, and α‐MnO₂/β‐C₂S nanocomposite for effective removal of phosphate from water

Rathore

Waghmare

Rai

2023

Int J Applied Ceramic Tech

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A novel α‐manganese dioxide/β‐dicalcium silicate (α‐MnO2/β‐C2S) nanocomposite was synthesized for adsorption of phosphate ions from water to inhibit eutrophication. The adsorption rate constants (k2) of α‐MnO2/β‐C2S nanocomposite are higher than the bare α‐MnO2 and β‐C2S revealing an increased adsorption rate in composite materials. The higher adsorption capacity of nanocomposites results from relatively larger pores. The phosphate sorption process obeys the pseudo‐second‐order kinetic model well and is likely governed by chemisorption. The equilibrium removal capacity of α‐MnO2, β‐C2S, and α‐MnO2/β‐C2S nanocomposite was found to be 25 mg/g, 34.48 mg/g, and 52.63 mg/g which are very close to experimental values. Adsorption of the PO43− onto adsorbents could be favorably described by the Langmuir model. D‐R isotherm model fitting showed physical adsorption by β‐C2S and α‐MnO2/β‐C2S nanocomposites and chemisorption on α‐MnO2. The maximum adsorption capacity () of the adsorbents calculated from the Langmuir model were 28.58 mg/g, 44.03 mg/g, and 63.65 mg/g α‐MnO2, β‐C2S, and α‐MnO2/β‐C2S nanocomposites respectively. Thermodynamic parameter showed adsorption process occurs spontaneously in the nature exothermic nature decrease in randomness. The presence of coexisting Cl− anions decrease adsorption capacity.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

Section: Characterization Of the Adsorbentmentioning

confidence: 99%

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Synthesis of α‐MnO₂, β‐C₂S, and α‐MnO₂/β‐C₂S nanocomposite for effective removal of phosphate from water

Rathore

Waghmare

Rai

2023

Int J Applied Ceramic Tech

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“…It is explained by several causes: polymorphism of dicalcium silicate with increase of volume of substances, forming of sinter stress state during cooling, non-uniformity of elements distribution in sinter etc. Dicalcium silicate can be revealed together with cracks, which rose as a result of appearance of local internal stresses, during microscopic analysis [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effects of alumina on the stability of ferrite–calcium sinter with dicalcium silicate

Pyagay¹,

Lebedev²

2023

cisisr

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Laboratorial production of agglomerate with basicity CaO/SiO 2 = 1.3-1.5 is accompanied by its spontaneous friability, what leads to forming of visible cracks in agglomerate. When studying the influence of these sintering parameters on agglomerate strength, it is necessary to take into account content of not assimilated calcium oxides in sinter. Strength binding of agglomerate is formed on the base of calcium ferrites. Investigations were conducted on aluminium oxide of PA grade, Fe 2 O 3 , CaCO 3 of PA grade, aqueous silicic acid of P grade. Stability of sinters for above-mentioned systems was determined visually and using high-frequency method. In the first case the hightemperature Tamman furnace is used, where briquetted samples are put in a platinum cup and they are heated up to the temperature 1300 qC. Then, after 5 minutes holding for homogenization, the samples are cooled slowly together with the furnace to the temperature 500 qC. To determine the temperature of ȕĺȖ transition of dicalcium silicate, dielectric permeability is measured; it reacts on structural changes which cause variation of density. The boundary of sinters stability is situated along the line which is close to galenite. The part of aluminium oxide interacts with dicalcium ferrite and forms solid solutions together with complete Fe replacement by Al in dicalcium ferrite. Stable sinters are characterized by monotonous variation of dielectric losses and capacity in the conditions of complete dicalcium silicate binding by aluminium oxide. It was established that monocalcium ferrite does not form new compounds with aluminium oxide, which completely interacts with dicalcium silicate. The stable samples of the system CaFe 2 O 4 -Ca 2 SiO 4 -Al 2 O 3 are characterized by increase of alumosilicate amount and decrease of dicalcium silicate amount. When Ca 2 SiO 4 content decreases from 45 % to 28 %, the temperature reduces from 390-405 qC до 265-275 qC. Agglomerate containing 7 % of alumina practically does not contain free calcium oxide, what removes the cause of stresses appearing in the sinter. As a result of stabilization of ferrite-calcium sinter via replacement of silicon module by aluminium one, compression strength value increases up to 235 daN for a briquette.

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Reaction kinetics, microstructure and phase evolution of alkali-activated Si-Mn slag during early age

Liu

Wang

et al. 2022

Construction and Building Materials

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Fabrication, microstructure, and hydration of nano β-Ca2SiO4 powder by co-precipitation method

Cited by 9 publications

References 42 publications

Synthesis of α‐MnO₂, β‐C₂S, and α‐MnO₂/β‐C₂S nanocomposite for effective removal of phosphate from water

Synthesis of α‐MnO₂, β‐C₂S, and α‐MnO₂/β‐C₂S nanocomposite for effective removal of phosphate from water

Effects of alumina on the stability of ferrite–calcium sinter with dicalcium silicate

Reaction kinetics, microstructure and phase evolution of alkali-activated Si-Mn slag during early age

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Fabrication, microstructure, and hydration of nano β-Ca2SiO4 powder by co-precipitation method

Cited by 9 publications

References 42 publications

Synthesis of α‐MnO2, β‐C2S, and α‐MnO2/β‐C2S nanocomposite for effective removal of phosphate from water

Synthesis of α‐MnO2, β‐C2S, and α‐MnO2/β‐C2S nanocomposite for effective removal of phosphate from water

Effects of alumina on the stability of ferrite–calcium sinter with dicalcium silicate

Reaction kinetics, microstructure and phase evolution of alkali-activated Si-Mn slag during early age

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Product

Resources

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Synthesis of α‐MnO₂, β‐C₂S, and α‐MnO₂/β‐C₂S nanocomposite for effective removal of phosphate from water

Synthesis of α‐MnO₂, β‐C₂S, and α‐MnO₂/β‐C₂S nanocomposite for effective removal of phosphate from water