Effective desalination of brackish groundwater using zeolitized diatomite/kaolinite geopolymer as low-cost inorganic membrane; Siwa Oasis in Egypt as a realistic case study

Abukhadra, Mostafa R.; Eid, Mohamed Hamdy; El-Sherbeeny, Ahmed M.; Elgawad, Abd Elatty E. Abd; Shim, Jae‐Jin

doi:10.1016/j.jconhyd.2021.103923

Cited by 17 publications

(7 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to the numerous internal pores in geopolymer coatings, diatomite can act as a fine aggregate filler [26]. Initially, due to its higher water absorption, an increase in diatomite concentration results in higher adsorption of free water, thereby slowing down the progress of geopolymer hydration reactions [48].…”

Section: Mechanical Properties Of Geopolymer Coatingsmentioning

confidence: 99%

“…Diatomite, a resource-rich and economically viable natural mineral, is an effective additive for increasing the durability of geopolymer materials due to its distinctive microporous structure, large specific surface area, and heightened reactive potential. Although diatomite has been widely investigated and utilized for its contribution to the freeze resistance [22], thermal stability [23], adsorptive capacity [24][25][26][27] and mechanical strength [23] of geopolymer coatings, research dedicated to its role in augmenting the sag resistance of geopolymer coatings is limited.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Impact and Mechanism Analysis of Diatomite on the Sag Resistance of Geopolymer Coatings

Hu,

Jin,

Pang

et al. 2024

Preprint

View full text Add to dashboard Cite

The reduction in rheological parameters and dissolution rate of precursors in geopolymer coatings during early hydration significantly contributes to sagging. This study aims to improve the sag resistance of these coatings by incorporating diatomite filler. Rheological testing was conducted to assess the impact of diatomite and its concentration on yield stress, plastic viscosity, and thixotropy of the geopolymer coatings. The results indicated that diatomite's large specific surface area and high reactivity have a significant influence on the rheological parameters and early dissolution rate of precursors. With a diatomite concentration of 1.1%, the coating exhibited a yield stress of 2.749 Pa and a plastic viscosity of 0.921 Pa·s, maintaining stability, homogeneity, and no sagging at a thickness of 600 μm. Furthermore, the highly active SiO2 in diatomite participates in the secondary hydration reaction of the geopolymer materials, leading to the formation of substantial C-(A)-S-H gel. This gel enhances internal interconnectivity within the coating, thereby improving its rheological and mechanical properties.

show abstract

Section: Mechanical Properties Of Geopolymer Coatingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Impact and Mechanism Analysis of Diatomite on the Sag Resistance of Geopolymer Coatings

Hu,

Jin,

Pang

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Diatomite is a resource-abundant and economically viable natural mineral. With its unique microporous structure, large specific surface area, and high reactivity, it can effectively enhance the freezing resistance [ 43 ], thermal stability [ 44 , 45 ], adsorption capacity [ 46 , 47 , 48 , 49 ], and mechanical strength [ 44 , 50 , 51 , 52 ] of geopolymer materials. It is therefore regarded as an effective additive for improving the durability of geopolymer materials.…”

Section: Introductionmentioning

confidence: 99%

Improving Sag Resistance in Geopolymer Coatings Using Diatomite Filler: Effects on Rheological Properties and Early Hydration

Hu,

Jin,

Pang

et al. 2024

Materials

View full text Add to dashboard Cite

The reduction in the rheological parameters and dissolution rate of precursors in geopolymer coatings during early hydration significantly contributes to sagging. This study aims to improve the sag resistance of these coatings by incorporating diatomite filler. Rheological testing was conducted to assess the impact of diatomite and its concentration on the yield stress, plastic viscosity, and thixotropy of the geopolymer coatings. The results indicated that diatomite’s large specific surface area and high reactivity have a significant influence on the rheological parameters and early dissolution rate of precursors. With a diatomite concentration of 1.1%, the coating exhibited a yield stress of 2.749 Pa and a plastic viscosity of 0.921 Pa·s, maintaining stability, homogeneity, and no sagging at a thickness of 600 μm. Furthermore, the highly active SiO2 in diatomite participates in the secondary hydration reaction of the geopolymer materials led to the formation of substantial C-(A)-S-H gel. This gel enhances internal interconnectivity within the coating, thereby improving its rheological and mechanical properties.

show abstract

“…They noticed that this kind of material has a catalytic property and could be applied in wastewater treatment, including radioactive elements such as strontium Sr (II) [33]. In further studies, they also developed this composition for the purification of groundwater and sewage water from such ions as phosphate and ammonium, which can be applied against the eutrophication process [35] as well as in a system of water desalination [36] based on the same technology-geopolymerbased compositions.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Diatomite Addition on the Properties of Geopolymers Based on Fly Ash and Metakaolin

Nykiel,

Korniejenko,

Setlak

et al. 2024

Materials

View full text Add to dashboard Cite

Geopolymer materials, considered to be an alternative to Portland cement-based concretes, can be produced from various types of waste aluminosilicate raw materials. This article presents the results of research related to the use of diatomite as an additive in geopolymers. The results of testing geopolymer composites with 1%, 3%, and 5% additions of diatomite with a grain size of 0–0.063 mm after and without thermal treatment were presented. This article presents the physical properties of the diatomite additive, the morphology of diatomite particles SEMs, thermal analysis, and compressive strength test results. In this research, diatomite was treated as a substitute for both fly ash and metakaolin (replaced in amounts of 1 and 3%) and as a substitute for sand introduced as a filler (in this case, 5% of diatomite was added). As a result of this research, it was found that the addition of diatomite instead of the main geopolymerization precursors in amounts of 1 and 3% had a negative impact on the strength properties of geopolymers, as the compressive strength was reduced by up to 28%. The introduction of crushed diatomite instead of sand in an amount of 5% contributed to an increase in strength of up to 24%.

show abstract

Effective desalination of brackish groundwater using zeolitized diatomite/kaolinite geopolymer as low-cost inorganic membrane; Siwa Oasis in Egypt as a realistic case study

Cited by 17 publications

References 34 publications

The Impact and Mechanism Analysis of Diatomite on the Sag Resistance of Geopolymer Coatings

The Impact and Mechanism Analysis of Diatomite on the Sag Resistance of Geopolymer Coatings

Improving Sag Resistance in Geopolymer Coatings Using Diatomite Filler: Effects on Rheological Properties and Early Hydration

The Influence of Diatomite Addition on the Properties of Geopolymers Based on Fly Ash and Metakaolin

Contact Info

Product

Resources

About