Decomposition kinetic characteristics of calcium carbonate containing organic acids by TGA

Li, Xiangguo; Lv, Yang; Ma, Baoguo; Wang, Weiqiang; Jian, Shouwei

doi:10.1016/j.arabjc.2013.09.026

Cited by 97 publications

(47 citation statements)

References 6 publications

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“…Indeed, we found that the regenerated prism contained more organic materials than normal prism layer (Figure 4f). The weight losses between 230°C and 600°C were due to the thermolysis of the organic matter, and the release of CO 2 from the decomposition of CaCO 3 after 600°C led to further dramatic weight losses (Li et al, 2017). The content of the shell matrix in the regenerated prismatic layers was calculated to be about 7.46% weight of the total mass, probably the highest matrix content in biominerals.…”

Section: Resultsmentioning

confidence: 99%

Direct control of shell regeneration by the mantle tissue in the pearl oysterPinctada fucatavia accelerating CaCO3 nucleation

Huang

Liu

Jiang

et al. 2019

Preprint

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28Molluscan bivalves rapidly repair the damaged shells to prevent further injury. However, it 29 remains unclear how this process is precisely controlled. In this study, we applied scanning 30 electronic microscopy, transmission electronic microscopy and histochemical analysis to 31 examine the detailed shell regeneration process of the pearl oyster Pinctada fucata. It was found 32 that the shell damage caused the mantle tissue to retract, which resulted in dislocation of the 33 mantle zones to their correspondingly secreted shell layers. However, the secretory repertoires 34 of the different mantle zones remained unchanged. As a result, the dislocation of the mantle 35 tissue dramatically affected the shell morphology, and the unusual presence of the submarginal 36 zone on the nacreous layers caused de novo precipitation of prismatic layers on the nacreous 37 layers. Real-time PCR revealed that the expression of the shell matrix proteins (SMPs) were 38 significantly upregulated, which was confirmed by the thermal gravimetric analysis (TGA) of 39 the newly formed shell. The increased matrix secretion accelerated CaCO3 nucleation thus 40 promoting shell deposition. Taken together, our study revealed the close relationship between 41 the physiological activities of the mantle tissue and the morphological change of the 42 regenerated shells. 43

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Section: Resultsmentioning

confidence: 99%

Direct control of shell regeneration by the mantle tissue in the pearl oysterPinctada fucatavia accelerating CaCO3 nucleation

Huang

Liu

Jiang

et al. 2019

Preprint

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“…The third stage (480-900 ℃) is the final pyrolysis process of Sambucus williamsii Hance root, which mainly occurs carbonization reaction. With the reaction proceeding, the TGA curve gradually tends to straight line, and the weight loss rate of thermal decomposition process remains basically unchanged after 700 ℃ [21,22]. The thermal decomposition process of Sambucus williamsii Hance root at 900 ℃ was described by TGA experiment, which provided a reference for the future study of the thermal decomposition of Sambucus williamsii Hance.…”

Section: Analysis Of Pyrolysis Characteristics Of Sambucus Williamsiimentioning

confidence: 98%

Resource utilization of Sambucus williamsii Hance root

et al. 2020

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In recent years, more and more attention has been paid to bio-energy. People are eager to find new substances from sustainable forest products for energy research. As an important forest resource, Sambucus williamsii Hance has gradually attracted people's attention. Therefore, in order to explore a new way of comprehensive utilization of Sambucus williamsii Hance, the root samples of Sambucus williamsii Hance were collected and extracted with ethanol, benzene/ethanol and methanol, respectively. Fourier transform infrared spectroscopy (FT-IR), thermogravimetry (TGA) and pyrolysis gas chromatography-mass spectrometry (Py-GC-MS) were used to detect the treated samples, and various substances in Sambucus williamsii Hance root were studied in depth. The results show that the thermal decomposition products of raw material powders and extracts contain many chemical substances. Such as (1R)-(-)-Myrtenal, D-Mannose, Furfural, O-Xylene, Phenol, 2,6-dimethyl-. These substances have broad application prospects in chemical industry, bio-medicine, food additives and other fields, thus providing a theoretical basis for the rational use of Sambucus williamsii Hance.

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“…Thirdly, from 600-635 C to 800 C, with an average weight loss of 8.5%. This stage can be attributed to the decomposition of CaCO3 [49].…”

Section: Catalytic Propertiesmentioning

confidence: 99%

Eggshell-supported Catalysts for the Advanced Oxidation Treatment of Humic Acid Polluted Wastewaters

Oulego

Laca

Calvo

et al. 2019

Water

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Metal nanoparticles have been reported as effective catalysts for the removal of refractory compounds from industrial wastewaters in advanced oxidation processes. Additionally, hundreds of thousands of tons of eggshells are discarded worldwide each year. In this work, this waste has been evaluated as support for the synthesis of nanomaterials by wet impregnation method. Four supported catalysts, with a load of iron or copper of 5% and 15%, were prepared and thoroughly characterized by means of different techniques (elemental analysis, XRF, XRD, FTIR, N2 adsorption-desorption, SEM, TEM and TGA). The catalysts performance was evaluated in wet oxidation tests to degrade humic acids, analyzing the evolution with time of COD, biodegradability index (BOD5/COD), color number and pH. The best results were achieved with 15% Cu and 5% Fe catalysts (COD reduction being 82.3% and 75.1%, respectively), whereas a COD reduction of 58% was obtained employing non-impregnated eggshell. This can be mainly attributed to the metal loading and the good metal distribution on the surface of the support. The BOD5 value of humic acids was initially null and, in all assays, the oxidation treatment enhanced the biodegradability. Therefore, eggshell has proved to be an interesting material to be employed as support in nanoparticles preparation.

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Decomposition kinetic characteristics of calcium carbonate containing organic acids by TGA

Cited by 97 publications

References 6 publications

Direct control of shell regeneration by the mantle tissue in the pearl oysterPinctada fucatavia accelerating CaCO3 nucleation

Direct control of shell regeneration by the mantle tissue in the pearl oysterPinctada fucatavia accelerating CaCO3 nucleation

Resource utilization of Sambucus williamsii Hance root

Eggshell-supported Catalysts for the Advanced Oxidation Treatment of Humic Acid Polluted Wastewaters

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