Synthesis of nano-alumina and their effect on structure, mechanical and thermal properties of geopolymer

Zidi, Zeineb; Ltifi, Mounir; Ayadi, Z. Ben; Mır, L. El

doi:10.1080/21870764.2019.1676498

Cited by 50 publications

(10 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In a study in which geopolymer was produced using SF as natural S source and micro S as artificial S source, it was stated that micro S additive had a more positive effect on compressive strength than SF additive [52]. Similarly, it is stated that the mechanical properties are improved by adding microsized natural A [85] and artificial A [54] into the geopolymer. In a study in which metakaolin-based geopolymer was produced using pharmaceutical glass powder as S source, it was determined that the curing temperature of 60 °C and the 8 M NaOH concentration were optimum values.…”

Section: Compressive Strength Test Resultsmentioning

confidence: 99%

The effect of micro-SiO2 and micro-Al2O3 additive on the strength properties of ceramic powder-based geopolymer pastes

Kaya

2021

J Mater Cycles Waste Manag

View full text Add to dashboard Cite

In this study, the effect of micro-SiO 2 (S) and micro-Al 2 O 3 (A) additives on the strength of geopolymer pastes was investigated. Micro S + A are added to the raw ceramic powder (CP) by weight. NaOH is used as activator. The ratio of NaOH is adjusted to contain 3%, 6% and 9% sodium (Na) in proportion to the binder weight. CP is mixed with micro S, micro A and NaOH + water in a standard cement mixer, it is placed in standard molds of 40 mm × 40 mm × 160 mm. The molds were wrapped in a fireproof oven bag and kept in the oven at 105 °C for 24 h. As a result of the mechanical tests on the samples compressive strength between 3.53 and 17.97 MPa were determined in the samples containing micro S and micro A. An increase in compressive strength was observed with the increase of S/A and (S + A)/CP ratio in the samples. As a result of the regression analysis, it was concluded that 1.60% for S/A, 8.52% for (S + A)/CP and 6.74% for Na in geopolymer pastes could be the optimum mixing ratio.

show abstract

Section: Compressive Strength Test Resultsmentioning

confidence: 99%

The effect of micro-SiO2 and micro-Al2O3 additive on the strength properties of ceramic powder-based geopolymer pastes

Kaya

2021

J Mater Cycles Waste Manag

View full text Add to dashboard Cite

show abstract

“…The samples were analyzed by X‐ray diffraction in order to verify the crystalline characteristic of the geopolymers and the possible formation of new crystalline compounds. In this sense, it was possible to observe that geopolymers have crystalline phases as evidenced by the literature, [ 14 ] characterized by the presence of sodalite at angles 17 °, 29 °, 37 °, 41 °, 70°, 72 °, 74 °, and 76 °, and Quartz with a more intense peak at 31 °. However, the insertion of magnetic nanoparticles in the geopolymer structure decreased the intensity of the sodalite and quartz peaks.…”

Section: Resultsmentioning

confidence: 66%

Magnetic Porous Geopolymer: A Cheaper and Efficient Environmental Tool for Heavy Metal Sorption

Maranhão

Souza

Filho

et al. 2021

Macromolecular Symposia

View full text Add to dashboard Cite

Sorption of heavy metals is a crucial controller method for environmental pollution. Contamination by heavy metals is one of the most critical and discussed environmental issue nowadays that fits in the context of bioaccumulation. Some examples of these contaminants are lead, cadmium, and chromium. In order to avoid increasing the level of these contaminants in rainwater networks, the Brazilian Council of Environment (CONAMA) establishes that it is essential that industries that produce effluents remove these metals before returning the effluent to the network. Given this, a new technology is proposed for the removal of heavy metals. A magnetic nanocomposite is produced by adding maghemite nanoparticles to an aluminosilicate matrix and subjected to heavy metal-contaminated effluents to sorption through this material. In order to evaluate the efficiency of removal of heavy metals by aluminosilicates, the effluents are analyzed by atomic absorption spectroscopy, and the results show a 99% sorption capacity. Finally, lethality tests, using Artemia salina, are performed. The best results are from the chromium and lead absorption tests.

show abstract

“…In addition, it was possible to verify that the presence of the magnetic particles modified with silica in the geopolymers decreased the intensity of the peaks, and this indicates that there was an amorphization of the structure, because the greater the amount of silica in the matrix, the more amorphous the geopolymer formed. This factor allowed the formation of a new structure to Faujasite with molecular formula (Na) 2 (Si, Al) 12O24 15H2O and angles 6 °, 14 ° and 25 ° (13)(14)(15). Infrared Spectroscopy with Fourier Transform was performed with the objective of verifying the chemical composition of the geopolymers with and without magnetic charges, by identifying the characteristic bands of the material.…”

Section: Resultsmentioning

confidence: 99%

Use of Static Method to remove Heavy Metal of the Contaminated Water, using Porous Geopolymer and Magnetically Loaded

Maranhão¹,

Júnior²,

Athayde³

et al. 2021

BJEDIS

View full text Add to dashboard Cite

Due to several catastrophic fires in France involving flammable organic plastics, Davidovits began his search for new materials resistant to heat, developing an alkaline activated silico-aluminous material, which was called a geopolymer. The polymeric Si-O-Al network gives the geopolymer ion exchange property, allowing the immobilization of heavy and radioactive metals within the material matrix. Due to the geopolymer's characteristic of immobilizing heavy metals in its matrix, this project aims to evaluate the geopolymer's ability to absorb heavy metals in contaminated water. For this, samples of porous geopolymers with magnetic charges in concentrations of 1, 2 and 3% were produced. And, subsequently, toxic metal solutions were made, such as Chromium, Cadmium and Lead at a concentration of 3ppm, then the sorption was carried out using the static method, where 0.5 g of the gepopolymer was dispersed in 25 ml of contaminated water and left stirring for 5 minutes, with the aid of a mechanical stirrer, and left to rest for 24 hours for the geopolymer to settle and the supernatant to be collected (this procedure was performed for geopolymers with and without magnetic charges). Afterwards, the treated water was analyzed by the atomic absorption technique, in order to investigate the geopolymer's sorption capacity. All tests were performed in triplicate and the mean, standard deviation and 95% confidence limit were evaluated to determine the reliability of the results.

show abstract

Synthesis of nano-alumina and their effect on structure, mechanical and thermal properties of geopolymer

Cited by 50 publications

References 18 publications

The effect of micro-SiO2 and micro-Al2O3 additive on the strength properties of ceramic powder-based geopolymer pastes

The effect of micro-SiO2 and micro-Al2O3 additive on the strength properties of ceramic powder-based geopolymer pastes

Magnetic Porous Geopolymer: A Cheaper and Efficient Environmental Tool for Heavy Metal Sorption

Use of Static Method to remove Heavy Metal of the Contaminated Water, using Porous Geopolymer and Magnetically Loaded

Contact Info

Product

Resources

About