Synthesis and characterization of porous and photocatalytic geopolymers based on natural clay: Enhanced properties and efficient Rhodamine B decomposition

Ettahiri, Youssef; Bouna, Lahcen; Brahim, Akhsassi; Benlhachemi, Abdeljalil; Bakiz, Bahcine; Sánchez-Soto, Pedro J.; Eliche-Quesada, Dolores; Pérez-Villarejo, Luis

doi:10.1016/j.apmt.2023.102048

Cited by 2 publications

(1 citation statement)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, geopolymeric materials can also be reinforced by adding polymers in the production of hybrid materials [26][27][28][29][30][31]. These materials have been developed following the principles of "Green Chemistry", as they have been obtained by synthesis from a wide variety of raw materials, including mineral by-products and recycled products, thus reducing energy demand and environmental impact during their production [19,20,25,32]. Geopolymers are the logical consequence of "Green Chemistry" in the service of sustainable development [6].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Geopolymeric Materials from Industrial Kaolins, with Variable Kaolinite Content and Alkali Silicates Precursors

Martínez-Martínez,

Bouguermouh,

Bouzidi

et al. 2024

Materials

Self Cite

View full text Add to dashboard Cite

In the present work, the development of geopolymeric materials with Na or K based on industrial kaolin samples, with variable kaolinite content and alkaline silicates, is studied. XRF, XRD, FTIR and SEM-EDS have been used as characterization techniques. Three ceramic kaolin samples, two from Algeria and one from Charente (France), have been considered. In particular, chemical and mineralogical characterization revealed elements distinct of Si and Al, and the content of pure kaolinite and secondary minerals. Metakaolinite was obtained by grinding and sieving raw kaolin at 80 μm and then by thermal activation at 750 °C for 1 h. This metakaolinite has been used as a base raw material to obtain geopolymers, using for this purpose different formulations of alkaline silicates with NaOH or KOH and variable Si/K molar ratios. The formation of geopolymeric materials by hydroxylation and polycondensation characterized with different Si/Al molar ratios, depending on the original metakaolinite content, has been demonstrated. Sodium carbonates have been detected by XRD and FTIR, and confirmed by SEM-EDS, in two of these geopolymer materials being products of NaOH carbonation.

show abstract

Section: Introductionmentioning

confidence: 99%

Preparation of Geopolymeric Materials from Industrial Kaolins, with Variable Kaolinite Content and Alkali Silicates Precursors

Martínez-Martínez,

Bouguermouh,

Bouzidi

et al. 2024

Materials

Self Cite

View full text Add to dashboard Cite

show abstract

Metallic aluminium in municipal solid waste incineration fly ash as a blowing agent for porous alkali-activated granules

Luukkonen,

Yu,

Adhikary

et al. 2024

R. Soc. Open Sci.

View full text Add to dashboard Cite

Porous alkali-activated materials are synthetic aluminosilicates that should be often produced as granules for practical applications. In the present study, municipal solid waste incineration fly ash with ~1.2 wt% of metallic aluminium was used as a novel blowing agent for metakaolin (their ratio ranged from 0% to 100%) with an aqueous sodium silicate solution as the alkali-activator and granulation fluid in high-shear granulation. The compressive strength of all granules was sufficient (≥2 MPa). Water absorption indicated an increase in porosity as the fly ash content increased. However, X-ray microtomography imaging showed no clear correlation between the fly ash content and porosity. The granules exceeded the leaching limits for earth construction materials for antimony, vanadium, chloride and sulphate. Of those, antimony, chloride and sulphate could be controlled by decreasing the ash content, but the source of vanadium was identified as metakaolin. The increase in the fly ash content decreased the cation exchange capacity of the granules. In conclusion, the recommended fly ash content is equivalent to 0.3 wt% of Al 0 and the developed granules could be best suited as light-weight artificial aggregates in concrete where the additional binder would provide stabilization to decrease the leaching.

show abstract

Synthesis and characterization of porous and photocatalytic geopolymers based on natural clay: Enhanced properties and efficient Rhodamine B decomposition

Cited by 2 publications

References 43 publications

Preparation of Geopolymeric Materials from Industrial Kaolins, with Variable Kaolinite Content and Alkali Silicates Precursors

Preparation of Geopolymeric Materials from Industrial Kaolins, with Variable Kaolinite Content and Alkali Silicates Precursors

Metallic aluminium in municipal solid waste incineration fly ash as a blowing agent for porous alkali-activated granules

Contact Info

Product

Resources

About