Reaction mechanisms of calcined kaolin processing waste-based geopolymers in the presence of low alkali activator solution

Prasanphan, Sitthisak; Wannagon, Anucha; Kobayashi, Takaomi; Jiemsirilers, Sirithan

doi:10.1016/j.conbuildmat.2019.06.116

Cited by 52 publications

(29 citation statements)

References 37 publications

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“…This reaction results in the generation of new hybrid gel formation. 31,32 The strong sharp peak at 1722 and 1723 cm −1 was also assigned to the ester groups that formed during the polymerization. The carboxylate groups of the polymer may react with the OH groups on the surface of KLN resulting in ester formation.…”

Section: Resultsmentioning

confidence: 97%

“…The formation of a newly emerged band at 3436 and 3442 cm −1 was the result of the direct intercalation of P(DMAEMA‐ co ‐AMPS) copolymer chains into KLN interlayer spaces providing evidence that the reaction between KLN and P(DMAEMA‐ co ‐AMPS) took place during the polymerization. This reaction results in the generation of new hybrid gel formation …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Charge‐Functionalized and Structurally Enhanced (Cryo)Hybrids from Acrylic (Co)Monomers and Kaolin: Altering Physicochemical Properties via Cryotropic Gelation

Tanc

Orakdöğen

2019

J Polym Sci B Polym Phys

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The potential to improve mechanical, structural, and mechanochemical properties of charge‐functionalized poly(N,N‐dimethylaminoethyl methacrylate) (PDMAEMA)‐based hybrid cryogels is investigated. The simple and versatile synthesis of hybrid cryogels with high strength and toughness using cationic DMAEMA and ionic comonomer 2‐acrylamido‐2‐methyl‐1‐propane sulfonic acid has been proposed via in situ free‐radical crosslinking (cryo)polymerization by which the properties of virgin polymer can be modulated to required applications by incorporation of inorganic filler kaolin (KLN). Two factors affecting swelling and elasticity of hybrid gels (referred as PDA/KLNm), KLN content and gel preparation temperature, are studied. The optimum KLN concentration for desired swelling and modulus of elasticity is determined as 0.80% (w/v). Effective crosslinking density of hybrid hydrogels increases with KLN addition and this dependence is expressed by a quadratic polynomial as a function of KLN concentration. The results show that obtained hybrid gels with multiresponsive properties could be regarded as “smart materials” in sensing and actuation applications. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 1758–1778

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Charge‐Functionalized and Structurally Enhanced (Cryo)Hybrids from Acrylic (Co)Monomers and Kaolin: Altering Physicochemical Properties via Cryotropic Gelation

Tanc

Orakdöğen

2019

J Polym Sci B Polym Phys

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“…The stability of the samples hydrated in LC was tested by their immersion in distil water. The products of alkali-activated systems hydrated on the air can further solidify the water environment and they are water resistant [48]. The CS values of the samp after their 28-day-long exposure to distilled water are shown in Table 3.…”

Section: Selection Of the Activator For Ka And Fa Alkali Activation (mentioning

confidence: 99%

Alkali-Activated Metakaolin and Fly Ash as Unfired Ceramic Bonding Systems

et al. 2021

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Metakaolin (MK) prepared by the calcination of kaolin at 550 °C and fly ash (FA) from the combustion of black coal in a granulating boiler were used to prepare unfired ceramic bonding systems via the alkali activation process. A long-term stability of the mechanical properties of the prepared samples similar to the unfired ceramic systems was observed. The optimal metakaolin and fly ash ratio, the type of the activator (NaOH or water glass) and its concentration were evaluated after the hydration in: a) laboratory conditions; b) hydration box; and c) under the hydrothermal activation. Raw materials and the samples prepared by alkali activation process were characterized by XRD, XRF, TG/DTA, and FTIR methods. The mechanical properties of the prepared samples were tested using a compressive strength test after 2, 28 and 56 days of hydration. The compressive strengths of 16 and 24 MPa after 28 days of hydration were reached for FA samples activated with water glass. The alkali activation of MK was successful in the NaOH solution of the molar concentration above 5 M. The compressive strength values of metakaolin, activated hydrothermally and hydrated at laboratory conditions, reached 11.2 and 5.5 MPa, respectively, for 5 M activator of NaOH.

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“…Figure 7d shows that the peak position of CS remains a constant except that the intensity of characteristic diffraction peak is slightly increased, indicating that the structure of CS-modified Dt has a certain stability, and the diffraction peak of arsenic-bearing substances appears, indicating that the CS has a certain adsorption effect on arsenic. [50], cristobalite [51], and montmorillonite [52]. The diffraction broad-bands observed in range of 18-32 • may be attributed to the amorphous SiO 2 [53].…”

Section: Int J Environ Res Public Health 2020 17 429 7 Of 14mentioning

confidence: 99%

“…35-1974] [48]. Figure 7b suggests that the raw Dt consists mainly of silica (SiO2) [49] with a little kaolin (Al2Si2O5(OH)42H2O) [50], cristobalite [51], and montmorillonite [52]. The diffraction broad-bands observed in range of 18-32° may be attributed to the amorphous SiO2 [53].…”

Section: Int J Environ Res Public Health 2020 17 429 7 Of 14mentioning

confidence: 99%

Adsorption of As(V) from Aqueous Solution on Chitosan-Modified Diatomite

Yang

Gong

Huang

et al. 2020

IJERPH

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A novel chitosan (CS)-modified diatomite (Dt) was prepared by a simple mixture in the mass ratio to remove As(V) from aqueous solution in this research. The CS-modified Dt adsorbent was characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and X-ray powder diffraction (XRD) analysis. The parameters to influence the adsorption of As(V) ion were studied under such conditions as kinetics, adsorption isotherm, and pH effect. The results revealed that adsorption of As(V) was initially rapid and the equilibrium time was reached after 40 min. The optimal value of the pH was 5.0 for better adsorption. The equilibrium data were well fitted to the Langmuir isotherm compared to the Freundlich isotherm, and exhibited the highest capacity and removal efficiency of 94.3% under an initial As(V) concentration of 5 mg/L. The kinetic data were well described by the pseudo-second-order model. In addition, 0.1 M NaOH has the best desorption efficiency of As(V) adsorbed on CS-modified Dt, and the removal efficiency of As(V) was still higher than 90% when after six adsorption-desorption cycles. These results showed that the CS-modified Dt could be considered as a potential adsorbent for the removal of As(V) in aqueous solution.

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Reaction mechanisms of calcined kaolin processing waste-based geopolymers in the presence of low alkali activator solution

Cited by 52 publications

References 37 publications

Charge‐Functionalized and Structurally Enhanced (Cryo)Hybrids from Acrylic (Co)Monomers and Kaolin: Altering Physicochemical Properties via Cryotropic Gelation

Charge‐Functionalized and Structurally Enhanced (Cryo)Hybrids from Acrylic (Co)Monomers and Kaolin: Altering Physicochemical Properties via Cryotropic Gelation

Alkali-Activated Metakaolin and Fly Ash as Unfired Ceramic Bonding Systems

Adsorption of As(V) from Aqueous Solution on Chitosan-Modified Diatomite

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