Efficient sequestration of malachite green in aqueous solution by laterite-rice husk ash-based alkali-activated materials: parameters and mechanism

Tomé, Sylvain; Shikuku, Victor Odhiambo; Tamaguelon, Hermann Dzoujo; Akiri, Saphan; Etoh, Marie Annie; Rüscher, Claus H.; Étamé, Jacques

doi:10.1007/s11356-023-27138-3

Cited by 13 publications

(7 citation statements)

References 48 publications

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“…The absorption band at 687 cm − 1 characterized the bending vibration mode of Fe-OH of goethite [28]. The decrease of this band (Fe-OH) after alkaline activation is due to the alteration of the minerals (kaolinite and goethite) present in CS [19]. This analyze corresponds to the observation made in section 3.4.1.…”

Section: Ftir Analysissupporting

confidence: 57%

“…The news bands at 1453 cm − 1 on CEBs0 and at 1460 cm − 1 on CEBs0.4 spectra are attributable of O-C-O bond of natrite resulting from the carbonation reaction resulting between CO 2 atmospheric and the free Na + ions [5], [19].…”

Section: Ftir Analysismentioning

confidence: 98%

“…This was linked to the alteration with time of some minerals phases present in natural pozzolan and clay soil (i.e. hematite, goethite) in alkaline medium allowing the formation of amorphous phase, sodium aluminosilicate such contributing in reinforcement of geopolymer matrix [4], [19]. [20], [21].…”

Section: Chemical Composition Of Palm Bermentioning

confidence: 99%

“…The decrease in the intensity of kaolinite peaks located at 12.32 •, and 24.91• and the disappearance of goethite peaks located at 21.20• and 41.27 • means that, the kaolinite and goethite contained in clay soil dissolves partially in the activating alkaline solutions to contribute to formation of amorphous phase i.e. geopolymer network which plays the role of stabilizer in the matrix within the different composites (CEBs0 and CEBs0.4) [19]. In addition, phases such as labradorite (PDF-Nr.-010831372) and augite (PDF-Nr.-010781392), initially present in natural pozzolan are not identi ed in the composites (CEBs0 and CEBs0.4).…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

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Effect of treated palm fibers on the mechanical properties of compressed earth bricks stabilized by geopolymer binder based natural pozzolan

Kamwa,

Mousi,

Tome

et al. 2024

Preprint

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The aim of this work is to study the influence of the palm fibers treated with soda hydroxide solution, on the properties of the compressed earth bricks stabilized with 15% of natural pozzolana based alkaline geopolymer binder. To achieve this objective, mortars composed of treated fibers at different levels (0.1, 0.2, 0.3, 0.4 and 0.5%) for a length of 4 and 16 cm, have been developed. These different mortars with those without fibers were subjected to mechanical (dry compression, wet compression, and flexion), physical (water absorption), mineralogical (XRD, FTIR) and microstructural (SEM/EDX) characterizations after 7 and 90 days. The results obtained show that, in general the addition of fibers improves the mechanical and physical properties of compressed earth bricks stabilized with 15% of alkali-geopolymer binder. In addition, the adding of treated palm fibers does not have an influence on the mineralogical composition of the composite bricks. The observation of the diffractograms of FTIR analysis shows that these fibers have a capacity to sorption water molecules. Furthermore, the optical analysis shows that the binder used perfectly encapsulates the fibers. This situation shows that the treated fibers act perfectly as a filler in the matrix. The maximum dry compressive strength and flexural strength values are obtained with the addition of 0.4% fibers at 90 days and are 8.08 and 5.8 MPa respectively. Furthermore, an additional of 0.4% of palm fibers in earth bricks stabilized by the alkaline geopolymer binder based natural pozzolan is recommended for the construction of buildings.

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Section: Ftir Analysissupporting

confidence: 57%

Section: Ftir Analysismentioning

confidence: 98%

Section: Chemical Composition Of Palm Bermentioning

confidence: 99%

Section: X-ray Diffraction Analysismentioning

confidence: 99%

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Effect of treated palm fibers on the mechanical properties of compressed earth bricks stabilized by geopolymer binder based natural pozzolan

Kamwa,

Mousi,

Tome

et al. 2024

Preprint

Self Cite

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show abstract

“…21 Additionally, geopolymers are known to be better adsorbents than their precursors. 4,13,15,16,23 While the use of coal powders (CPs) as adjuvants in the synthesis of geopolymers is hypothesized to reduce accessibility of CV to the acidic sites, the resultant antagonistic or protagonist effect in the binary elimination of anionic Cr(VI) is also unknown. Furthermore, while adsorption capacities at equilibrium of adsorbents in binary systems have been evaluated, adsorption kinetics/rates in binary systems are seldom evaluated.…”

Section: Introductionmentioning

confidence: 99%