Optimisation of zeolite LTA synthesis from alum sludge and the influence of the sludge source

Rozhkovskaya, Alexandra; Rajapakse, Jay; Millar, Graeme J.

doi:10.1016/j.jes.2020.06.019

Cited by 22 publications

(8 citation statements)

References 59 publications

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“…The SiO 2 /Al 2 O 3 ratio increased for the synthesized sample ZA4, and a decrease in the intensity of the sodalite peaks was observed; thus, a higher content of LTA and crystallinity were associated with sample ZA4. The negligible influence of agitation time for homogenization of the suspension during LTA synthesis was in accordance with the findings of a previous study, in which a gel remained without agitation between 5 and 24 h, which did not have a positive effect on zeolite crystallization [36].…”

Section: Effect Of the Reduction In Homogenization Time On The Synthe...supporting

confidence: 91%

“…LTA crystals with well-defined edges were found in ZA2 in comparison to ZA1; this was in concordance with the higher crystallinity determined for ZA2. The formation of sodalite also occurred over the surface of LTA zeolite cubes, as was reported in previous studies [36]. The lepisphere morphology characteristic of sodalites [37] was determined, and heterogeneous particle sizes of sodalite ranged between 1.3 and 2.1 µm for ZA1, and between 1.0 and 1.7 µm for ZA2.…”

Section: Chemical Composition Of Synthesized Materialssupporting

confidence: 79%

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From Waste to Added-Value Product: Synthesis of Highly Crystalline LTA Zeolite from Ore Mining Tailings

Campoverde

Guaya

2023

Nanomaterials

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The use of wastes is necessary to contribute to environmental sustainability. In this study, ore mining tailings were used as the raw material and precursor for the synthesis of LTA zeolite, a value-added product. Pre-treated mining tailings were submitted to the synthesis stages under specific established operational conditions. The physicochemical characterization of the synthesized products was performed with XRF, XRD, FTIR and SEM, to identify the most cost-effective synthesis condition. The LTA zeolite quantification and its crystallinity were determined as effects of the SiO2/Al2O3, Na2O/SiO2 and H2O/Na2O molar ratios used, as well as the influence of the synthesis conditions: mining tailing calcination temperature, homogenization, aging and hydrothermal treatment times. The zeolites obtained from the mining tailings were characterized by the LTA zeolite phase accompanied by sodalite. The calcination of mining tailings favored the production of LTA zeolite, and the influence of the molar ratios, aging and hydrothermal treatment times were determined. Highly crystalline LTA zeolite was obtained in the synthesized product at optimized conditions. Higher methylene blue adsorption capacity was associated with the highest crystallinity of synthesized LTA zeolite. The synthesized products were characterized by a well-defined cubic morphology of LTA zeolite and lepispheres of sodalite. The incorporation of lithium hydroxide nanoparticles over LTA zeolite synthesized (ZA-Li+) from mining tailings yielded a material with improved features. The adsorption capacity towards cationic dye was higher than for anionic dye, especially for methylene blue. The potential of using ZA-Li+ in environmental applications related to methylene blue deserves detailed study.

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Section: Effect Of the Reduction In Homogenization Time On The Synthe...supporting

confidence: 91%

Section: Chemical Composition Of Synthesized Materialssupporting

confidence: 79%

From Waste to Added-Value Product: Synthesis of Highly Crystalline LTA Zeolite from Ore Mining Tailings

Campoverde

Guaya

2023

Nanomaterials

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“…This agrees with Tantawy [22], who states that amorphous Al(OH) 3 will undergo a series of dehydroxylation reactions to eventually transform into crystalline Al 2 O 3 . Typically, the conversion occurs above 1100 • C [37]. However, the presence of sulfate and organic compounds has lowered the temperature agreeing with previous authors [38][39][40].…”

Section: Characterisation Of Assupporting

confidence: 90%

Reactivity of raw, pyroprocessed and GGBS-blended alum sludge (AS) waste for sustainable cement production

Lei

Pavía

2023

Journal of Building Engineering

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“…The above results suggest Fe impurity from CG has an adverse impact on the crystallization of zeolite A. The existence of Fe impurity inhibits the thermodynamic stability of the synthesis system, which promotes the transformation from the metastable zeolite A to stable SOD 31. At the same time, CG containing high content of Fe impurity (7.72 wt%) is used as raw material to synthesize zeolite A.…”

Section: Resultsmentioning

confidence: 91%

Synthesis of zeolite A with high whiteness from coal gangue by two‐step pretreatment method

Liu

Yan

et al. 2022

Asia-Pacific J Chem Eng

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The comprehensive utilization of coal gangue (CG) is restricted by color elements in CG including C and Fe x O y . The magnetic separation and hydrothermal acid leaching are combined to pretreat the solid waste CG to synthesize zeolite A with high whiteness. Firstly, Fe 2 O 3 component in CG is in situ reduced by C to magnetite in the process of high-temperature calcination for decarburization followed by physical magnetic separation. Secondly, the residual Fe impurity in CG is further removed by hydrothermal acid leaching. The effects of calcination temperature, calcination time, acid leaching temperature, acid concentration, and liquid to solid ratio on Fe removal rate (R Fe2O3 ) and the whiteness of the synthesized zeolite A are investigated. The influence of Fe impurities on the Ca 2+ ion exchange capacity (E) of the zeolite A synthesized from CG is clarified. R Fe2O3 could reach the value of 88.53%. The synthesized zeolite A exhibits a typical cubic morphology with rounded edges, the high whiteness of 95.46%, and the satisfactory E with the value of 296.02 mgCaCO 3 Ág À1 , both of which meet the requirements of national standard. This work suggests that this pretreatment method for CG would have broad prospects in the efficient resource utilization of CG.

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Optimisation of zeolite LTA synthesis from alum sludge and the influence of the sludge source

Cited by 22 publications

References 59 publications

From Waste to Added-Value Product: Synthesis of Highly Crystalline LTA Zeolite from Ore Mining Tailings

From Waste to Added-Value Product: Synthesis of Highly Crystalline LTA Zeolite from Ore Mining Tailings

Reactivity of raw, pyroprocessed and GGBS-blended alum sludge (AS) waste for sustainable cement production

Synthesis of zeolite A with high whiteness from coal gangue by two‐step pretreatment method

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