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

Habte, Lulit; Shiferaw, Natnael; Mulatu, Dure; Thriveni, Thenepalli; Ramakrishna, Chilakala; Ahn, Ji Whan

doi:10.3390/su11113196

Cited by 222 publications

(132 citation statements)

References 30 publications

(45 reference statements)

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“…Calcium hydroxide (Ca(OH) 2 ) synthesized from waste eggshell was used as a precursor. The synthesis of Ca(OH) 2 was described in detail in previous work [37]. The wet carbonation method was used for the synthesis of aragonite.…”

Section: Synthesis Of Sorbent (Aragonite)mentioning

confidence: 99%

Sorption of Cd2+ and Pb2+ on Aragonite Synthesized from Eggshell

Habte

Shiferaw²,

Khan

et al. 2020

Sustainability

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In the present work, waste eggshells were used as a precursor for the synthesis of aragonite crystals through the wet carbonation method. Cadmium (Cd2+) and lead (Pb2+) were removed by the synthesized aragonite from synthetic wastewater. The influence of initial solution pH, contact time, Cd2+ and Pb2+ concentration, and sorbent dosage were evaluated. The major sorption was observed in the first 100 mins and 360 mins for Pb2+and Cd2+ respectively reaching sorption equilibrium at 720 mins (12 hr). The sorption capacity toward Pb2+ was much higher than toward Cd2+. Both heavy metals displayed high sorption capacities at initial pH 6. The pseudo-second-order kinetic model fits well with the experimental data with a higher correlation coefficient R2. Two isotherm models were also evaluated for the best fit with the experimental data obtained. Langmuir isotherm best fits the sorption of the metals on aragonite synthesized from eggshells. X-ray diffraction (XRD) and Scanning electron microscopy (SEM) results of sorbent after sorption showed that the mechanism of sorption was dominated by surface precipitation. Therefore, aragonite crystals synthesized from waste eggshells can be a potential substitute source for the removal of Cd2+ and Pb2+ from contaminated water.

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Section: Synthesis Of Sorbent (Aragonite)mentioning

confidence: 99%

Sorption of Cd2+ and Pb2+ on Aragonite Synthesized from Eggshell

Habte

Shiferaw²,

Khan

et al. 2020

Sustainability

Self Cite

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“…The particle size was in the range of 50-100 nm, with a narrow size distribution in the case of the CMW nanostructure; this feature of the curve indicates the suitability of the CMW fine substitution. In some cases, the grain size, particle shape, crystalline pattern, and surface chemistry can be controlled by using calcination technique through the modulation of the solution composition, solvent properties, reaction temperature, and aging time [44].…”

Section: Sample (Lime Mud)mentioning

confidence: 99%

Evaluation of Calcium Oxide Nanoparticles from Industrial Waste on the Performance of Hardened Cement Pastes: Physicochemical Study

et al. 2020

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Large amounts of carbonated mud waste (CMW) require disposal during sugar manufacturing after the carbonation process. The lightweight of CMW enables its utilization as a partial replacement for the cement to reduce costs and CO2 emissions. Here, various levels of CMW, namely, 0, 5, 10, 15, 20, and 25 wt.% were applied to produce composite cement samples with ordinary Portland cement (OPC) as a regular mix design series. Pure calcium oxide (CaO) nanoparticles were obtained after the calcination of CMW. The techniques of X-ray fluorescence spectrometers (XRF), Transmission electron microscope (TEM), Selected area diffraction (SAED), Scanning electron microscope (SEM), energy dixpersive X-ray (EDX), and dynamic light scattering (DLS) were used to characterize the obtained CaO nanoparticles. According to the compressive strength and bulk density results, 15 wt.% CMW was optimal for the mix design. The specific surface area increased from 27.8 to 134.8 m2/g when the CMW was calcined to 600 °C. The compressive strength of the sample containing 15% CMW was lower than the values of the other pastes containing 5% and 10% CMW at all of the curing times. The porosity factor of the hardened cement pastes released with a curing time of up to 28 days. Excessive CMW of up to 25 wt.% reduced the properties of OPC.

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“…Moreover, it was observed characteristic peaks of Ca(OH)2 at the same positions as those found for the calcined eggshell and at new ones: 47.1 (102), 54.3 (111), 62.6 (201), and 71.8 (202) [33]. Magnesium oxide was also detected as impurity, since some characteristics peaks of this compound at 37.8 (111), 43.1(200) overlapped with CaCO3, and at 62.6 (220) overlapped with Ca(OH)2,were identified [34]. The diffractogram of the calcined eggshell ( Figure 1a) shows that the support is made up of calcium oxide (CaO) and calcium hydroxide (Ca(OH) 2 ).…”

Section: Structural Characterization: Xrd and Ftir Analysesmentioning

confidence: 93%

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

Cited by 222 publications

References 30 publications

Sorption of Cd2+ and Pb2+ on Aragonite Synthesized from Eggshell

Sorption of Cd2+ and Pb2+ on Aragonite Synthesized from Eggshell

Evaluation of Calcium Oxide Nanoparticles from Industrial Waste on the Performance of Hardened Cement Pastes: Physicochemical Study

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

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