The effect of microwave and hydrothermal treatments on the properties of hydrotalcite

Zadaviciute, S.; Baltakys, K.; Bankauskaite, Agne

doi:10.1007/s10973-016-5593-5

Cited by 17 publications

(7 citation statements)

References 38 publications

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“…The properties of in-core volumetric and uniform heating, lower thermal inertia and faster responses make microwave chemistry applied widely [7,8]. In the materials and metallurgy research, microwave assisted synthesis of catalysts, electrodes, and optical devices [9][10][11] have proven to be efficient with some special effects. Moreover, in the organic compound extraction and separation, in medical, food and energy fields, the microwave assistance method has already been practically used [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Microwave Intensified Vanadium Bearing-High Carbonaceous Shale Acid Extraction Process

et al. 2018

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Abstract:The microwave assisted leaching of the vanadium bearing-high carbonaceous shale process was investigated using surface response methodology (RSM) based on Box-Behnken design (BBD). The effect of important factors such as CaF 2 usage, H 2 SO 4 concentration, leaching time and microwave power, as well as the interactive coefficients, the signification of the model and factors were analyzed. With the condition of 9.8 wt % CaF 2 , 23.0 vol % H 2 SO 4 , 170.6 min and 350 W, the actual values of vanadium (V) leaching efficiency in microwave heating (MH) and conventional heating (CH) were 85.43% and 79.64%, which agreed well with the predicted values. Meanwhile, the influence order of the factors in MH and CH was CaF 2 dosage > H 2 SO 4 concentration > leaching time. Microwave was an efficacious impetus for V extraction, but the microwave power itself was not a significant factor when the temperature of leaching system was high enough. The further characterization of mineral components before and after leaching confirmed that the prior dissolving of muscovite and pyrite in MH was intensified, while both minerals were in fine grains and filled with black carbon. The selective heating of carbon and pyrite sequenced the large temperature gradient between solids and liquids, which accelerated the dissolving reaction of muscovite with CaF 2 present in MH condition.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Microwave Intensified Vanadium Bearing-High Carbonaceous Shale Acid Extraction Process

et al. 2018

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“…Microwave and sonication are also effective methods for the preparation of highly dispersed and crystallized LDH materials [30]. The effect of microwave irradiation during the hydrothermal process to obtain LDHs was investigated by S. Zadaviciute et al [36] Genty et al [37] compared these methods by co-precipitation and a significant increase of the specific surface area and catalytic activity is observed. Microwave-assisted synthesis of LDHs also stands out with its low cost and low environmental impact treatments resulting in efficiency in preparing LDHs using a low cost and low environmental impact.…”

Section: Synthesis Methodsmentioning

confidence: 99%

Synthesis, Properties and Practical Applications of Doped and Undoped, Zinc-Containing Layered Double Hydroxides – A Brief Review

Balayeva

2022

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Recently, layered double hydroxides (LDHs) have been developed for more potential applications in various industry fields. Many synthesis methods of LDHs in the literature have been considered and classified by changing properties. However, the property change by the synthesis method does not happen in the same way in all LDHs. Also, when LDH with the same composition is synthesized by the same synthesis method, it is possible to obtain LDHs with the same composition but different properties due to the change of reaction parameters. Recently, the doping of semiconductor nanocomposites with different element atoms has led to new properties. The effect of the elements used in the doping process on the properties of zinc-containing LDHs was investigated and explained in the review article. The synthesis's techniques differ from each other by the reaction parameters and they impact the crystal structure, physicochemical properties, and morphology of LDHs. Finding more additional effects of doping processes and doping elements' nature on the zinc-containing LDHs' properties, the synthesis procedures, and the determination of reaction parameters are shown in this review article. It was revealed that rare earth elements are not selected as three valence metals for the main structure of LDHs, they are mainly used as a doping element which is replaced by three valence metals (Al, Cr, Ti, Fe(III)) as dopants because of the ionic radius and various factors.

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“…The aging presumably occurs through the Ostwald ripening process, in which larger and more perfect crystallites grow at the expense of smaller particles in solution by dissolution/precipitation processes [21]. Therefore, microwaveassisted hydrothermal treatment, or hydrothermal treatment by conventional heating, have been widely used with the aim of improving structural and textural properties [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Use of Ethylamine, Diethylamine and Triethylamine in the Synthesis of Zn,Al Layered Double Hydroxides

2022

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Amines with two carbon atoms in the organic chain [ethylamine (EA), diethylamine (DEA), triethylamine (TEA)] have been used as precipitant agents to obtain a hydrotalcite-like compound with Zn (II) and Al (III) as layered cations and with nitrate anions in the interlayered region to balance the charge. This Layered Double Hydroxide was prepared following the coprecipitation method, and the effect on the crystal and particle sizes was studied. Also, the effect of submitting the obtained solids to hydrothermal post-synthesis treatment by conventional heating and microwave assisted heating were studied. The obtained solids were exhaustively characterized using several instrumental techniques, such as X-ray diffraction, Thermal Analysis (DTA and TG), Chemical Analysis, Infrared Spectroscopy (FT-IR), determination of Particle Size Distribution and BET-Surface area. Well crystallized solids were obtained showing two possible LDH phases, depending on the orientation of the interlayer anion with respect to the brucite-like layers. The results indicated that there is a certain influence of the amine, when used as a precipitating agent, and as a consequence of the degree of substitution, on the crystallinity and particle size of the final solid obtained. The LDHs obtained using TEA exhibited higher crystallinity, which was improved after a long hydrothermal treatment by conventional heating. Regarding the shape of the particles, the formation of aggregates in the former solid was detected, which could be easily disintegrated using ultrasound treatments, producing solid powder with high crystallinity and small particle size, with homogeneous size distribution.

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The effect of microwave and hydrothermal treatments on the properties of hydrotalcite

Cited by 17 publications

References 38 publications

Evaluation of Microwave Intensified Vanadium Bearing-High Carbonaceous Shale Acid Extraction Process

Evaluation of Microwave Intensified Vanadium Bearing-High Carbonaceous Shale Acid Extraction Process

Synthesis, Properties and Practical Applications of Doped and Undoped, Zinc-Containing Layered Double Hydroxides – A Brief Review

Use of Ethylamine, Diethylamine and Triethylamine in the Synthesis of Zn,Al Layered Double Hydroxides

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