Calcium oxide nanoparticles synthesis from hen eggshells for removal of lead (Pb(II)) from aqueous solution

Jalu, Reta G.; Chamada, Tariku Ayala; Kasirajan, Ramachandran

doi:10.1016/j.envc.2021.100193

Cited by 69 publications

(31 citation statements)

References 20 publications

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“…As a result, lead adsorption has occurred not only on the surface but also in the pores of nanocomposite. Previous studies have reported similar results [84,85]. Metal ions have been reported to easily form poly-nuclear species and hydrolysis due to the smaller value of their hydrolysis constant.…”

Section: Kinetic Study and Contact-time Effectssupporting

confidence: 56%

“…However, when the dosage of nZVFe-RSAC reached 8 and 10 g L −1 , the lead-removal percentage showed little difference, which reflected that 6 (g L −1 ) of this nanocomposite was capable of effectively removing Pb(II) ions. There may be a connection between this phenomenon and the saturation of the active sites [84].…”

Section: Effects Of Ph Value Zeta Potential and Absorbent Dosage On E...mentioning

confidence: 98%

“…In higher concentrations of metal ions, fewer binding sites are available on the surface of the adsorbent, resulting in a decrease in the efficiency of removal. This has resulted in a saturation of the active sites on the adsorbent, indicating that less desirable sites were involved in the adsorption process [84]. The nZVFe-RSAC nanocomposite had 99.8% and 60.0% removal efficiencies at initial Pb(II) concentrations of 10 and 1000 mg L −1 , respectively.…”

Section: Initial Concentration Of Lead and Isotherm Studymentioning

confidence: 99%

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Pb(II) Removal from Aqueous Solutions by Adsorption on Stabilized Zero-Valent Iron Nanoparticles—A Green Approach

Sepehri

Kanani

Abdoli

et al. 2023

Water

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Nano zero-valent iron particles (nZVFe) are known as one of the most effective materials for the treatment of contaminated water. However, a strong tendency to agglomerate has been reported as one of their major drawbacks. The present study describes a green approach to synthesizing stabilized nZVFe, using biomass as a porous support material. Therefore, in the first step, biomass-derived activated carbon was prepared by thermochemical procedure from rice straw (RSAC), and then the RSAC-supported nZVFe composite (nZVFe–RSAC) was employed to extract Pb(II) from aqueous solution and was successfully synthesized by the sodium borohydride reduction method. It was confirmed through scanning electron microscopy (SEM) and X-ray diffraction (XRD) characteristics that the nZVFe particles are uniformly dispersed. Results of the batch experiments showed that 6 (g L−1) of this nanocomposite could effectively remove about 97% of Pb(II) ions at pH = 6 from aqueous solution. The maximum adsorption capacities of the RS, RSAC, and nZVFe–RSAC were 23.3, 67.8, and 140.8 (mg g−1), respectively. Based on the results of the adsorption isotherm studies, the adsorption of Pb(II) on nZVFe–RSAC is consistent with the Langmuir–Freundlich isotherm model R2=0.996). The thermodynamic outcomes exhibited the endothermic, possible, and spontaneous nature of adsorption. Adsorption enthalpy and entropy values were determined as 32.2 kJ mol−1 and 216.9 J mol−1 K−1, respectively. Adsorption kinetics data showed that Pb(II) adsorption onto nZVFe–RSAC was fitted well according to a pseudo-second-order model. Most importantly, the investigation of the adsorption mechanism showed that nZVFe particles are involved in the removal of Pb(II) ions through two main processes, namely Pb adsorption on the surface of nZVFe particles and direct role in the redox reaction. Subsequently, all intermediates produced through the redox reaction between nZVFe and Pb(II) were adsorbed on the nZVFe–RSAC surface. According to the results of the NZVFe–RSAC recyclability experiments, even after five cycles of recovery, this nanocomposite can retain more than 60% of its initial removal efficiency. So, the nZVFe–RSAC nanocomposite could be a promising material for permeable reactive barriers given its potential for removing Pb(II) ions. Due to low-cost and wide availability of iron salts as well as rice biowaste, combined with the high adsorption capacity, make nZVFe–RSAC an appropriate choice for use in the field of Pb(II) removal from contaminated water.

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Section: Kinetic Study and Contact-time Effectssupporting

confidence: 56%

Section: Effects Of Ph Value Zeta Potential and Absorbent Dosage On E...mentioning

confidence: 98%

Section: Initial Concentration Of Lead and Isotherm Studymentioning

confidence: 99%

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Pb(II) Removal from Aqueous Solutions by Adsorption on Stabilized Zero-Valent Iron Nanoparticles—A Green Approach

Sepehri

Kanani

Abdoli

et al. 2023

Water

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“…The moisture content of a film indicates the percentage of water capacity present. The lower the moisture content, the greater the adsorption efficiency due to lesser water molecules binding to the active sites of the film matrix and allowing target analytes to bind onto the active sites [ 43 ]. Therefore, the ESP/CS film showed promise as an adsorbent due to its lower moisture content.…”

Section: Resultsmentioning

confidence: 99%

Development and Characterization of the Biodegradable Film Derived from Eggshell and Cornstarch

Vonnie

Rovina

Azhar

et al. 2022

JFB

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In the current study, cornstarch (CS) and eggshell powder (ESP) were combined using a casting technique to develop a biodegradable film that was further morphologically and physicochemically characterized using standard methods. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to characterize the morphology of the ESP/CS film, and the surface of the film was found to have a smooth structure with no cracks, a spherical and porous irregular shape, and visible phase separation, which explains their large surface area. In addition, the energy dispersive X-ray (EDX) analysis indicated that the ESP particles were made of calcium carbonate and the ESP contained carbon in the graphite form. Fourier Transform Infrared Spectroscopy indicated the presence of carbonated minerals in the ESP/CS film which shows that ESP/CS film might serve as a promising adsorbent. Due to the inductive effect of the O–C–O bond on calcium carbonate in the eggshell, it was discovered that the ESP/CS film significantly improves physical properties, moisture content, swelling power, water solubility, and water absorption compared to the control CS film. The enhancement of the physicochemical properties of the ESP/CS film was principally due to the intra and intermolecular interactions between ESP and CS molecules. As a result, this film can potentially be used as a synergistic adsorbent for various target analytes.

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“…The application of WCES powder as an adsorbent for the elimination of lead has been well demonstrated by many researchers in recent years. Wang et al [74] successfully used biochar developed from WCES powder low-cost adsorbent for the remediation of contaminated water while Jalu et al [75] used CaO extracted from WCES as adsorbent for water decontamination. Their efforts were successful as up to 97% of the lead pollutant were removed.…”

Section: Wastewater Purification Applicationsmentioning

confidence: 99%

Pathways for Sustainable Utilization of Waste Chicken Eggshell

Awogbemi¹,

Kallon²,

Aigbodion³

2022

Journal of Renewable Materials

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Chicken eggshell is one of the most common wastes generated from households, restaurants and other food processing outlets. Waste Chicken Eggshells (WCES) also constitutes an environmental nuisance and ends up discarded at dumping site with no consideration of further usage. The main constituent of WCES is calcium carbonate from which calcium or calcium oxide can be extracted for various applications. This current effort reviews recently published literature on the diverse applications of WCES. The considered utilization avenues include catalysts for biofuel production, construction industry, wastewater purification, industrial sector, food industry, medical, and agricultural applications. The specific areas of application apart from the transesterification reactions include cement additives and replacement in concrete, asphalt binder, adsorbent of metals and dyes, production of hydroxyapatite, food supplement and fortification, dentistry, therapeutics, bone formation, drug delivery, poultry feeds as well as organic fertilizer. For most of the identified applications, the WCES is subjected to pretreatment and other modification techniques before utilization. The conversion of WCES to valuable products is a cost-effective, safe, environmentally friendly, non-toxic and viable means of waste disposal and utilization. More investigations are needed to further explore the benefits derivable from this bioresource.

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Calcium oxide nanoparticles synthesis from hen eggshells for removal of lead (Pb(II)) from aqueous solution

Cited by 69 publications

References 20 publications

Pb(II) Removal from Aqueous Solutions by Adsorption on Stabilized Zero-Valent Iron Nanoparticles—A Green Approach

Pb(II) Removal from Aqueous Solutions by Adsorption on Stabilized Zero-Valent Iron Nanoparticles—A Green Approach

Development and Characterization of the Biodegradable Film Derived from Eggshell and Cornstarch

Pathways for Sustainable Utilization of Waste Chicken Eggshell

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