Recycling Waste Seashells to Produce Calcitic Lime: Characterization and Wet Slaking Reactivity

Ferraz, Eduardo; Gamelas, José A. F.; Coroado, João; Monteiro, Eliseu; Rocha, Fernando

doi:10.1007/s12649-018-0232-y

Cited by 45 publications

(31 citation statements)

References 44 publications

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“…FTIR spectrum of CaO nanoparticle, Ca(OH) 2 gel, raw eggshell and commercial CaO, Ca(OH) 2 and CaCO 3 are presented in Figure 2 to characterize the synthesized nanoparticle and also to compare the results with the commercial powders. The FTIR result of the raw eggshell showed broadband centering at 1415.52 cm −1 which is a characteristic of C-O bond showing a bond between the oxygen atom of carbonate and calcium atom [30]. In addition, there were two sharp bands at 711.62 and 875.54 cm −1 showing C-O bond [30].…”

Section: Resultsmentioning

confidence: 98%

“…The FTIR result of the raw eggshell showed broadband centering at 1415.52 cm −1 which is a characteristic of C-O bond showing a bond between the oxygen atom of carbonate and calcium atom [30]. In addition, there were two sharp bands at 711.62 and 875.54 cm −1 showing C-O bond [30]. The peaks of raw eggshell were in correspondence with commercial CaCO 3 except for the broadband at 2360.48 cm −1 which represents the N-H bond caused by the amines and amides present in the protein fiber of the eggshell membrane [31].…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of Nano-Calcium Oxide from Waste Eggshell by Sol-Gel Method

Shiferaw²,

et al. 2019

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The sol-gel technique has many advantages over the other mechanism for synthesizing metal oxide nanoparticles such as being simple, cheap and having low temperature and pressure. Utilization of waste materials as a precursor for synthesis makes the whole process cheaper, green and sustainable. Calcium Oxide nanoparticles have been synthesized from eggshell through the sol-gel method. Raw eggshell was dissolved by HCl to form CaCl 2 solution, adding NaOH to the solution dropwise to agitate Ca (OH) 2 gel and finally drying the gel at 900 • C for 1 h. The synthesized nanoparticle was characterized by scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR), X-Ray fluorescence (XRF) and X-ray diffraction (XRD). The FTIR and XRD results have clearly depicted the synthesis of calcium oxide from eggshell, which is mainly composed of calcium carbonate. The FE-SEM images of calcium oxide nanoparticles showed that the particles were almost spherical in morphology. The particle size of the nanoparticles was in the range 50 nm-198 nm. Therefore, waste eggshell can be considered as a promising resource of calcium for application of versatile fields.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Synthesis of Nano-Calcium Oxide from Waste Eggshell by Sol-Gel Method

Shiferaw²,

et al. 2019

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“…The waste (~950 g), previously washed with tap water, and the commercial limestone (~900 g) were dried at 105±5 ºC (Memmert UF110), coarsely crushed in a porcelain mortar, milled in a tungsten grinder (Retsch RMO 100) for 3 min and sieved at 38 μm. The resultant powders were thoroughly characterized using X-ray diffraction (XRD), X-ray fluorescence (XRF) spectrometry, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), Fourier Transform Infrared -Attenuated Total Reflection (FTIR-ATR) spectroscopy, and Raman spectroscopy, following the flowchart previously reported (20).…”

Section: Methodsmentioning

confidence: 99%

Exploring the potential of cuttlebone waste to produce building lime

et al. 2020

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The goal of this study is to find a practicable way to recycle cuttlebone waste in the production of lime. It was studied the behavior of calcium oxide obtained from the calcination of this waste at 900, 1000 and 1100 ºC and, after wet slaking, the produced lime was characterized. All the results were compared to calcium oxide or to hydrated lime obtained from commercial limestone. According to the slaking results, the waste and the limestone calcined at 1000 ºC achieved the R4 (around 13 min to reach 60 ºC) and R5 (60 ºC in 25 s) reactivity class, respectively. Changing the calcination temperature to 900 or 1100 ºC did not promote an increase in the reactivity of the calcined waste. Although less reactive than the calcined limestone, the calcined cuttlebone can be transformed without significant constraint into building lime, since this construction material fulfills the relevant physic-chemical standard specifications.

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“…(3) 3. Ca(OH)2(s) dipanaskan → CaO(s) + H2O(l) (4) (Habte et al, 2019;Galván-Ruiz et al, 2009;Ferraz et al, 2019;Jirimali et al, 2018;Araújo et al, 2019).…”

Section: Hasil Dan Pembahasanunclassified

Sintesis dan Karakterisasi Nanokalsium Oksida dari Cangkang Telur

Sunardi

Krismawati

Mahayana³

2020

ALCHEMY J.Pen.Kim

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Pencegahan osteoporosis dilakukan dengan mengkonsumsi kalsium. Pada umumnya kalsium yang dikonsumsi dalam bentuk mikro kalsium. Ukuran mikro kalsium hanya diserap tubuh sekitar 50%, sehingga sering menyebabkan defisiensi. Sehingga, teknologi untuk membuat ukuran nanokalsium telah dikembangkan agar penyerapan kalsium dalam tubuh lebih besar. Penelitian ini bertujuan untuk mensintesis nanokalsium dari cangkang telur yang merupakan limbah industri roti. Sintesis nanokalsium oksida dari cangkang telur dengan metode presipitasi. Sintesis dilakukan dengan mereaksikan cangkang telur yang telah bersih dan kering dengan HCl 2 N. Hasil reaksi dipisahkan dengan penyaringan sehingga diperoleh filtrat. Filtrat yang diperoleh direaksikan dengan NaOH sampai pengendapan tidak terbentuk lagi. Endapan yang diperoleh kemudian dipisahkan, dioven, dan dibakar dalam tanur pada suhu 600 °C selama 1 jam. Serbuk hasil sintesis dikarakterisasi menggunakan SEM-EDX, XRD dan FTIR. Hasil penelitian menunjukkan bahwa cangkang telur dapat disintesis menjadi nanokalsium oksida berupa kristal berwarna putih. Karakterisasi menggunakan SEM-EDX diperoleh hasil bahwa nanokalsium oksida dari cangkang telur berbentuk speris, teraglomerasi dengan ukuran partikel 12,41582 ± 0,13961 nm, mengandung unsur yaitu O (55,83%), C (33,24%), dan Ca (10,94%). Karakterisasi dengan XRD menunjukkan bahwa ukuran kristal nanokalsium oksida diperoleh hasil sebesar 10,46 nm. Karakterisasi dengan FTIR diperoleh puncak pada bilangan gelombang 1477,54 cm-1, 1053,15 cm-1, 8863,68 cm-1 dan ikatan Ca-O pada bilangan gelombang 512 cm-1.Synthesis and Characterization of Nano-Calcium Oxide from Eggshells. Consumption of calcium can prevent osteoporosis. Usually, calcium is consumed in the form of micro calcium. The micro size calcium is only absorbed by the body at around 50%, causing calcium deficiency. Therefore, technology to produce nano-size calcium has been developed to increase the amount of adsorption. This study aims to synthesize nano calcium from eggshells as a solid waste of bread industries. The synthesis was conducted by precipitation method. The synthesis was carried out by reacting clean and dry eggshells with HCl 2 N, and then followed by filtering to obtain the filtrate. The filtrate obtained was reacted with NaOH until the calcium was precipitated. The precipitate obtained was then separated, roasted, and burned in a furnace at 600 °C for 1 hour. The synthesized powders were characterized using SEM-EDX, XRD, and FTIR. The results showed that eggshells could be synthesized into nano-calcium oxide in the form of white crystals. Characterization using SEM-EDX showed that nano-calcium oxide from spherical eggshells, agglomerated with the particle size of 12.41582 ± 0.13961 nm, with elemental content of O (55.83%), C (33.24%), and Ca (10.94%). Characterization with XRD shows that the size of nano calcium oxide crystals was 10.46 nm. Characterization with FTIR shows peak at wavenumbers 1477.54 cm-1, 1053.15 cm-1, 8863.68 cm-1, and the Ca-O bond reveals at 512 cm-1.

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Recycling Waste Seashells to Produce Calcitic Lime: Characterization and Wet Slaking Reactivity

Cited by 45 publications

References 44 publications

Synthesis of Nano-Calcium Oxide from Waste Eggshell by Sol-Gel Method

Synthesis of Nano-Calcium Oxide from Waste Eggshell by Sol-Gel Method

Exploring the potential of cuttlebone waste to produce building lime

Sintesis dan Karakterisasi Nanokalsium Oksida dari Cangkang Telur

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