Characterization of Precipitated Calcium Carbonate from Eggshell Powder

Abstract

In this work, PCC was prepared from chicken eggshell powder (ESP) by dissolving 100 g ESP in 1 M hydrochloric acid at room temperature. Under vigorous stirring, PCC was precipitated from the ESP-dissolved solution using 1 M sodium carbonate solution. The dried PESP (precipitated eggshell powder) was then characterized by particle size analyzer, X-ray diffractometer, Brunauer-Emmett-Teller surface analyzer and thermogravimetric analyzer. The particle shape of the PESP was revealed using scanning electron microscope. It was found that PESP was a binary mixer of calcite and vaterite. The particles were in cubic and spherical shape. In addition, PESP had a volume average diameter of 8.16 μm, D[V, 0.5] of 7.22 μm, D[V,0.9] of 16.57 μm, and the specific surface area of 4.38 m2/g. The average particle size was lower than and the specific surface area was higher than that of ESP. The decomposition process of PESP occured in a single step between 610 and 770 °C, with 44.43% weight loss.

Tuning polymorphs of precipitated calcium carbonate from discarded eggshells: effects of polyelectrolyte and salt concentration

“… 25 The vaterite calcium carbonate is extensively used as a vehicle for encapsulation of drugs or nanoparticles carriers due to its spherical structures. In another study published by our group, 26 discarded eggshell particles were digested in hydrochloric acid, and a mixture of calcite and vaterite particles were obtained after reaction with sodium carbonate. However, no polyelectrolyte was used in those previous studies to stabilise the precipitated particles.…”

Preparation of hybrid particles of Ag nanoparticles and eggshell calcium carbonate and their antimicrobial efficiency against beef-extracted bacteria

“…According to the XRD pattern in figure 5d, crystal polymorphs of the precipitated eCaCO 3 prepared at 35°C was vaterite, whereas that of the ground eggshells was calcite. Sutapun et al also reported that ground eggshells were mainly composed of a calcite crystal structure [43]. The vaterite crystal structure is formed when CaCO 3 is It was deduced that PSS initiated vaterite nucleation through the binding of calcium ions to anionic sulfonate groups, and stabilized the vaterite during crystal growth [29].…”

“…This loss is related to the CO 2 released from CaCO 3 decomposition. Decarbonization of chicken eggshells has been reported to occur in the temperature range of 600-850°C [43,44].…”

Biogenic calcium carbonate derived from waste shells for advanced material applications: A review

“…The XRD analysis was performed on obtained microsphere and diffraction peaks located at 2θ of 20.9 °(004), 24.8 °(110), 27 °(112), 32.8 °(114), 43.7 °(300), 50.1 °(118), and 55.9 °(224) indicated the existence of crystalline phase in vaterite structure. In the related research conducted by Sutapun et al (2012), chicken eggshells were precipitated after digestion in hydrochloric acid with the addition of sodium carbonate in which vaterite and calcite mixture was obtained, and the surface area from untreated chicken eggshell particles increased from 2.55 [m 2 /g] to 4.38 [m 2 /g] after precipitation (Figure 6).…”

“…SEM microimages of chicken eggshell and precipitated chicken eggshells with a magnification of 3,000 X and 10,000 X, respectively. Reproduced with permission from Trans Tech Publications, Ltd., (Sutapun et al, 2012).…”