Recovery of phosphate from aqueous solutions using calcined eggshell as an eco-friendly adsorbent

Santos, Andreia F.; Arim, Aline Lemos; Lopes, Daniela; Gando-Ferreira, Licínio M.; Quina, Margarida J.

doi:10.1016/j.jenvman.2019.03.015

Cited by 58 publications

(20 citation statements)

References 27 publications

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“…The maximum phosphate uptake by various adsorbents was at an acidic pH ( 5.0) (Dai et al, 2011) or basic pH (Santos et al, 2019). Often, the adsorbents optimum phosphate ion adsorption pH is far from near-neutral and mostly favor acidic; for example, activated carbon (AC) at pH 4 (3.2 mg P/g), fly ash at pH 11-12 (30-36 mg P/g), magnetic iron-oxide nanoparticles (IONPs) at pH 2.0 (5.03 mg P/g) (Yoon et al, 2014), alum sludge at pH 4 (32 mg P/g), and calcined eggshell at pH 8.0 (96.1%) (Santos et al, 2019). However (Nakarmi et al, 2020) maximum phosphate uptake (265.5 mg P/g) using zinc oxide betaine modified biochar nanocomposites (ZnOBBNC) at pH 7, but a day-long extended contact time (24 h).…”

Section: Introductionmentioning

confidence: 99%

Plasticized magnetic starch-based Fe3O4 clay polymer nanocomposites for phosphate adsorption from aqueous solution

Atnafu

Leta

2021

Heliyon

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Plastics contribute a magnificent role to modern civilization, but the waste becomes a huge burden to ecology and remains intact for a thousand years. Hence, the recent movement is shifted to biodegradable plastic. In this study, an attempt was made to introduce an added value to the environment where the bio-plasticized materials were used for phosphate removal. A G-plasticized magnetic starch-based Fe 3 O 4 clay polymer nanocomposite (PNC) was synthesized to remove phosphate from the aqueous solution. It was synthesized from activated carbon (AC), coated iron oxide nanoparticles (CIONP), nanoclay (NC), and glycerol (G) as a plasticizer. The synthesized adsorbents were characterized with UV-Vis, SEM, XRD, and FTIR. The PNC and constituent (CIONP) were tested for phosphate removal through batch adsorption experiments. The adsorption capacity increases with increasing the adsorbent dose and decreases with an increase in phosphate concentration. The synthesized PNC effectively raised the constituent optimum phosphate ion adsorption pH from acidic (pH ¼ 3) to slightly acidic (pH ¼ 6). At the optimal pH, the CIONP and PNC maximum phosphate adsorption capacity (MPAC) was 3.12 and 2.31 mg P/g, respectively. In addition, the phosphate removal efficiency of PNC (45-95% at pH 6) was comparable to CIONP (58-97% at pH 3) under an initial 2-100 mg P/L. The adsorbents adsorption kinetics and isotherm study best described by the pseudo-second-order and Freundlich model, in turn. The SEM images support the conclusion, in which the PNC shows a heterogenous porous surface. Therefore, the adsorption mechanisms were mainly described by multilayer and chemical adsorption, such as electrostatic and ion exchange. It can be concluded that there is a positive synergistic effect between the biopolymer (starch) and nanomaterials that form the PNC. This study results propose the multiple added values of modified bio-plasticized material (with adsorbent) for environmental (phosphate) remediation.

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Section: Introductionmentioning

confidence: 99%

Plasticized magnetic starch-based Fe3O4 clay polymer nanocomposites for phosphate adsorption from aqueous solution

Atnafu

Leta

2021

Heliyon

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“…Chloride and sulfate salts of Fe 2+ and Fe 3+ are also used as precipitants (Mohammed and Shanshool, 2009). Today, different types of wastewater have been studied for removing or recovering P since the discharge of untreated P-rich effluents leads to the eutrophication of aquatic ecosystems (Mor et al, 2016;Rabiul Awual, 2019;Li et al, 2018;Santos et al, 2019). For example, recovery and potential reuse of P from agricultural wastewater was studied using tomato plant roots as a capture matrix and carboxymethyl cellulose (CMC) as an eluent and enhancer of P precipitation.…”

Section: Introductionmentioning

confidence: 99%

Recovery of different types of hydroxyapatite by precipitation of phosphates of wastewater from anodizing industry

Delgadillo-Velasco

Hernández‐Montoya

Montes-Morán

et al. 2020

Journal of Cleaner Production

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Recovery of phosphates from an anodizing industry wastewater was studied by chemical precipitation. Samples of wastewater were selected attending to the highest phosphate concentration observed during 1 year of weekly sampling. Different types of precipitant agents were analyzed in batch systems. Results showed that it is possible to remove 100 % of phosphates when Ca(OH) 2 is used as precipitant agent. The best conditions of precipitation were found following a L 9 orthogonal array design of the Taguchi method. For an initial concentration of phosphates of 4336 mg/L, these best conditions were a Ca/P molar ratio of 5.77, pH 2, stirring time of 15 min and settling time of 1 h. Additionally, it was demonstrated that the factors with more influence in the precipitation of phosphates with Ca(OH) 2 were the pH of the wastewater and the stirring time. When the phosphate removal was performed at pH 6 and 10, hydroxyapatite Ca 5 (PO 4 ) 3 (OH) was found in the

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“…As fact, the eggshell waste has been an abundant wastes in environment either come from egg consumption or the food industries. The waste materials are interesting to use as eco-friendly material to produce CaO [20].Nowdays, the alkali catalysts including CaO is popular used in biodiesel synthesis through the transesterification process by using unedible oils, such as Jatropha curcas oil [21]. However, on practical application while the CaO was used directly as a catalyst in the transesterification process, the oxygen ions in the CaO surface will form a hydrogen bond with methanol and glycerin, resulting in an increasing of the glycerin viscosity and formation of the suspension of CaO; thus, the CaO and glycerin are difficult to separate from the product [22].…”

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confidence: 99%

mentioning

confidence: 99%

Impregnation of CaO from Eggshell Waste with Magnetite as a Solid Catalyst (Fe3O4/CaO) for Transesterification of Palm Oil Off-Grade

et al. 2020

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In this work, calcium oxide (CaO) extracted from eggshell impregnated with magnetite (Fe 3 O 4 ) is prepared successfully and it had been applied on transesterification of palm oil off-grade. Prior experiment, the eggshells material are powdered and calcined at 900 • C then impregnated with Fe 3 O 4 and recalcined. The obtained Fe 3 O 4 /CaO catalyst is characterized using X-ray diffraction and Braunaeur-Emmet-Teller (BET) surface area. The influence of various parameters including recalcined time and temperature are investigated. The prepared catalyst is tested for transesterification of palm oil off-grade to produce biodiesel in which the optimal conditions of a methanol/palm oil off-grade molar ratio of 10:1, the catalyst weight of 6%, the reaction temperature of 70 • C, and the reaction time of 2 h. The transesterification product was analyzed using GC-MS, which showed the biodiesel yield of 90% at the recalcined temperature of 600 • C and reaction time of 2 h. It has been noted that the catalyst activity is achieved when the moderate recalcination temperature is applied and the disordered structure of the catalyst is maintained. This study also confirms that CaO impregnated with Fe 3 O 4 could be a solid catalyst for the biodiesel synthesis through transesterification reaction of palm oil off-grade.Catalysts 2020, 10, 164 2 of 13 this issue, several countries have successfully implemented some renewables from bioenergy, including biogas, biodiesel, and bioethanol [2][3][4][5]. On the other sides, some countries have also successfully generated the electrical power from renewable energy resources, such as geothermal, waves, hydro, wind, and solar energy [6][7][8][9][10]. However, there are some weak points resulted while the renewable energy is used, such as it is unstable, only available for certain periods, and therefore, its required the energy storage devices such as battery. However, the energy storage capacity of batteries is very limited, and for this reason some scientists are attempting to discover another type of energy storage materials that can store significant amount of energy [11][12][13].Calcium is one of the most abundant metals on earth. It can be mostly found as an ion in seawater [14], as well as geothermal hot springs [15][16][17][18]. It can be also found as an oxide in limestone and fossilized remnant sites [14]. However, in order to obtain the calcium from these resources is required the natural resource exploitation that is often given negative impact to environment. Considering the environmental safety, an alternative way has been used to produce calcium source, namely it produce from some renewable resources which are available abundantly in nature, such as egg shell material wastes, because the egg shell well known as a natural material contained lots of calcium oxide [19]. As fact, the eggshell waste has been an abundant wastes in environment either come from egg consumption or the food industries. The waste materials are interesting to use as eco-friendly material to produce CaO ...

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Recovery of phosphate from aqueous solutions using calcined eggshell as an eco-friendly adsorbent

Cited by 58 publications

References 27 publications

Plasticized magnetic starch-based Fe3O4 clay polymer nanocomposites for phosphate adsorption from aqueous solution

Plasticized magnetic starch-based Fe3O4 clay polymer nanocomposites for phosphate adsorption from aqueous solution

Recovery of different types of hydroxyapatite by precipitation of phosphates of wastewater from anodizing industry

Impregnation of CaO from Eggshell Waste with Magnetite as a Solid Catalyst (Fe3O4/CaO) for Transesterification of Palm Oil Off-Grade

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