Zeolites of the Natrolite-Thomsonite Series

Kol’tsova, T. N.

doi:10.1007/s10789-005-0203-0

Cited by 4 publications

(2 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[41]. The cowlesite mineral relates to the natrolite subgroup as a fibrous zeolite in the Dana classification, where Strunz placed it in a separate series [42]. The cowlesite has peaks at 2Ɵ of 5.8º, 4.46º, 19.8º and 30.07º [43] while cristobalite appeared at 2Ɵ of 21.7º [41].…”

Section: Analytical Instrumentsmentioning

confidence: 99%

Characterization and Evaluation of Natural Zeolite as a Pozzolanic Material

Saraya

Thabet

2018

Al-Azhar Bulletin of Science

View full text Add to dashboard Cite

This paper presents details about mineralogical and chemical composition of natural zeolite (NZ) from Harrat Shama for using it as a pozzolanic material. The structural properties and mineralogical composition of NZ were determined using XRF, XRD, FTIR, DSC, SEM-EDX as well as study surface texture and cation exchange capacity. The geopolymer paste was prepared using sodium silicate solution as activator for zeolite and incubated at 25 and 45 ºC up to 90 days. The compressive strength of NZ-based geopolymer was investigated up to 90 days. Five blended cement were designed by substitution for Portland cement by 0 %, 5 %, 10 %, 15 % and 20% of NZ. The compressive strength of NZ-OPC pastes were studied up to 90 days. The microstructure of NZ-Based geopolymer and hydrated NZ-cement pastes were tested. The results were shown that the sum of SiO 2 , Al 2 O 3 , and Fe 2 O 3 content in the natural zeolite was approximately 82.71.3% and mainly composed of clinoptilolite mineral. Geopolymerization of NZ gave a good dense geopolymer matrix with high early stage mechanical properties. The NZ has shown improving early stage compressive strength of all blended cement pastes up to 7 days. The incorporation of nature raw zeolite in cement, up to 10% wt, improved the compressive strength to 7-29%. Generally, Saudi Arabian natural zeoilite (NZ) have high pozzolanic properties and could be used in the preparation of geopolymers matrix and blended cement pastes.

show abstract

Section: Analytical Instrumentsmentioning

confidence: 99%

Characterization and Evaluation of Natural Zeolite as a Pozzolanic Material

Saraya

Thabet

2018

Al-Azhar Bulletin of Science

View full text Add to dashboard Cite

show abstract

“…25 Most natural kaolinites are composed of other crystal minerals as impurities which can reduce the adsorption capacity of the clay. Such impurities include anorthite, a calcium-rich aluminosilicate mineral belonging to the plagioclase feldspar family, cowlesite, a low-silica zeolite with extra-framework cations, 26 and quartz, a natural hydrophilic oxide-free silica mineral. 27 Removal of these impurities or their conversion to an adsorbent can greatly improve the adsorption capacity of kaolinites.…”

Section: Introductionmentioning

confidence: 99%

Removal of heavy metals from aqueous solutions by adsorption using natural and ammonium carbonate modified kaolinite clays

2023

View full text Add to dashboard Cite

Natural kaolinite obtained from Share, Nigeria was treated with ammonium carbonate to enhance the adsorption capacity. The optimum operating conditions for the adsorption of metal ions on the natural clay (SK clay) were employed on the ammonium carbonate-treated clay (SK-AC clay). The adsorption data were analysed using adsorption isotherm and kinetic models. The statistical p-values were less than 0.05, indicating that the model terms are significant for the adsorption of the metal ions. The pseudo-second-order kinetic model best describes the metal ions adsorption mechanism. The activation energy values less than 40 kJ mol-1 obtained indicated physisorption. Langmuir adsorption isotherm model fitted the adsorption data for Fe2+, Zn2+ and Cr6+ ions while the Freundlich model fitted Pb2+ ions adsorption. Analysis of thermodynamic parameters shows the adsorption is spontaneous and endothermic. The ammonium carbonate-modified clay exhibited an increase in adsorption capacity from 10.74 to 13.60 mg g-1, 16.48 to 17.38 mg g-1 and 11. 96 to 13.8 mg g-1 for Fe2+, Pb2+ and Zn2+ ions while uptake of Cr6+ decreased from 8.75 to 7.25 mg g-1. The results showed that the adsorption of Fe2+, Pb2+ and Zn2+ ions onto kaolin-containing cowlesite can be enhanced by treating it with ammonium carbonate.

show abstract

8.1.6.6 Fibrous zeolites

Burzo

2013

Tectosilicates

View full text Add to dashboard Cite

Zeolites of the Natrolite-Thomsonite Series

Cited by 4 publications

References 19 publications

Characterization and Evaluation of Natural Zeolite as a Pozzolanic Material

Characterization and Evaluation of Natural Zeolite as a Pozzolanic Material

Removal of heavy metals from aqueous solutions by adsorption using natural and ammonium carbonate modified kaolinite clays

8.1.6.6 Fibrous zeolites

Contact Info

Product

Resources

About