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Author: search.filters.author.Thompho, SomphobSubject: search.filters.subject.thermal decomposition

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    Simple Rapid Production of Calcium Acetate Lactate from Scallop Shell Waste for Agricultural Application
    (2025-05-01)
    Mongkol, Sorakit
    ;
    Seesanong, Somkiat
    ;
    Boonchom, Banjong
    ;
    Laohavisuti, Nongnuch
    ;
    Boonmee, Wimonmat
    Calcium acetate lactate (CAL) was rapidly synthesized for the first time using the reaction between the scallop shell-derived calcium carbonate (CaCO<inf>3</inf>) and the binary phase of acetic and lactic acids. Calcium acetate (CA) and calcium lactate (CL) synthesized from the reaction of scallop shell-derived CaCO<inf>3</inf> with each acid by similarity routes are compared with the obtained CAL product. The production yields are 88.24, 79.17, and 96.44%, whereas the solubilities are 93.77, 90.18, and 95.08% for CA, CL, and CAL, respectively. All the synthesized CA, CL, and CAL samples were characterized and confirmed by X-ray fluorescence (XRF) to examine the calcium main element and other impurities of minor elements, X-ray diffraction (XRD) to investigate the crystallography, Fourier transform infrared (FTIR) to characterize the vibrational characteristics of the functional groups, scanning electron microscope (SEM) to observe the sample morphologies, and the thermogravimetric analysis (TGA) to investigate the thermal decomposition processes of samples. The experimental results pointed out that the synthesized CA, CL, and CAL were the monohydrate, pentahydrate, and dihydrate forms with chemical formulae of Ca(CH<inf>3</inf>COO)<inf>2</inf>·H<inf>2</inf>O, Ca(CH<inf>3</inf>CHOHCOO)<inf>2</inf>·5H<inf>2</inf>O, and Ca(CH<inf>3</inf>COO)(CH<inf>3</inf>CHOHCOO)·2H<inf>2</inf>O, respectively. The final thermal decomposition product of all calcium compounds was calcium oxide (CaO). The CAL sample’s vibrational characteristics, crystal phases, and morphologies show the binary acetate and lactate anion phases, confirming the new binary anionic calcium acetate lactate obtained. In conclusion, this research proposes an easy and low-cost technique to prepare a new valuable CAL compound using scallop shell waste as a cheap and renewable calcium source.
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    Low-Cost and Eco-Friendly Calcium Oxide Prepared via Thermal Decompositions of Calcium Carbonate and Calcium Acetate Precursors Derived from Waste Oyster Shells
    (2024-08-01)
    Seesanong, Somkiat
    ;
    Seangarun, Chaowared
    ;
    Boonchom, Banjong
    ;
    Laohavisuti, Nongnuch
    ;
    Boonmee, Wimonmat
    Waste oyster shells were utilized to produce calcium carbonate (CaCO<inf>3</inf>) by grinding. This CaCO<inf>3</inf> was then reacted with acetic acid to yield calcium acetate monohydrate (Ca(CH<inf>3</inf>COO)<inf>2</inf>·H<inf>2</inf>O). Both CaCO<inf>3</inf> and Ca(CH<inf>3</inf>COO)<inf>2</inf>·H<inf>2</inf>O were used as precursors for synthesizing calcium oxide (CaO) through thermal decomposition at 900 °C and 750 °C, respectively. The yields of CaO from both precursors, determined through calcination experiments and thermogravimetric analysis (TGA), exceeded 100% due to the high purity of the raw agents and the formation of calcium hydroxide (Ca(OH)<inf>2</inf>). X-ray fluorescence (XRF) analysis revealed a CaO content of 87.8% for CaO-CC and 91.5% for CaO-CA, indicating the purity and contamination levels. X-ray diffraction (XRD) patterns confirmed the presence of CaO and minor peaks of Ca(OH)<inf>2</inf>, attributed to moisture adsorption. Fourier-transform infrared (FTIR) spectroscopy identified the vibrational characteristics of the Ca-O bond. Scanning electron microscopy (SEM) showed similar morphologies for both CaO-CC and CaO-CA, with CaO-CA displaying a significant amount of rod-like crystals. Based on these results, calcium acetate monohydrate (CA) is recommended as the superior precursor for synthesizing high-purity CaO, offering advantages for various applications.
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